Selwood H100 Instruction and safety manual

Selwood H100 Manual

SELWOOD H100

Operating & Service Manual

The products of Selwood Limited, are designed,

developed and produced in the company's Chandler's

Ford factory many features are covered by world-wide

patents. Product names such as Spate, Simplite and

Seltorque, are registered trademarks.

As all products are subject to continuous development,

the company reserves the right to alter the

specifications and information given in this manual

without prior notice.

Whilst every care has been taken in the preparation of

this publication the information it contains must not be

regarded as binding.

Amendments to this publication will only be issued to

cover those design changes which fundamentally alter

the build or operation and servicing procedures. They

will be distributed through the company's dealers and

agencies.

Your attention is drawn to the following symbols used

throughout this manual:-

CAUTION

This caution symbol draws attention to special

instructions or procedures that, if not correctly

followed, may result in damage to, or destruction of

equipment.

WARNING

This warning symbol draws attention to special

instructions or procedures that, if not strictly

observed, may result in personal injury.

WARNING

A WARNING SYMBOL WITH THIS TYPE OF

TEXT DRAWS ATTENTION TO SPECIAL

INSTRUCTIONS OR PROCEDURES WHICH, IF NOT

STRICTLY OBSERVED MAY RESULT IN SEVERE

PERSONAL INJURY, OR LOSS OF LIFE.

Additional copies of this manual are available

from Selwood Pt No 1310243000

Published by Selwood Limited

Instructions for Ordering

Replacement Parts

Always quote the pump serial number located

on the plate fastened to the bearing and air pump

mechanism housing.

Always quote the part number(s) (ten digits)

of the component(s), NOT the item number(s).

Always quote the description of the

component(s).

Items usually supplied together as sub-assemblies will

have the sub-assembly part number printed at the

bottom of the relevant page.

HEALTH AND SAFETY AT WORK 1974

As manufacturers of pumps and associated equipment

we wish to inform you that, in compliance with Section

6 of the Act, safety precautions should be taken with

our products.

We take every care to ensure as is reasonably

practicable that our products are safe and without risk

to health when properly used. Nevertheless,

appropriate health and safety precautions must be

taken, and in particular you are requested to have

special regard to the operational and safety

requirements leaflet P769 which accompanies each

pump on despatch from our premises.

Our products also conform to the EEC Machinery

Safety Directive and carry the C.E. mark.

CALIFORNIA USA

PROPOSITION 65 WARNING

Diesel engine exhaust and some of its

constituents are known to the State of

California to cause cancer, birth

defects, and other reproductive harm.

WARNING

Pumps and engines may be fitted with

seals or 'O' rings manufactured from

VITON or similar material.

When temperatures reach 400°C

(720°F) a corrosive acid is produced,

which cannot be removed from the skin.

If signs of material decomposition are

evident, or if in doubt, always wear

disposable heavy-duty gloves.

Selwood H100 Manual

SAFETY PRECAUTIONS

WARNING

ALL ITEMS IN THIS SECTION, IF NOT STRICTLY

OBSERVED, COULD RESULT IN SEVERE

PERSONAL INJURY OR LOSS OF LIFE.

WARNING! Only use lifting

equipment of suitable capacity for the size and weight

of the equipment being lifted. The following Label part

number 1310184000 should be fitted to the volute

casing to identify the correct use and expected weight

taken by each available lifting point. For lifting the body

unit as a whole the M16 tapping in the volute casing

should be used in conjunction with a suitable M16

lifting eye.

The equipment must always be lifted using

safe working practices and in accordance with any

local and national guidelines or statutes. It is intended

for guidance only. If in doubt, consult Selwood Pumps

or a local lifting expert.

Whilst lifting the unit keep personnel well

away and never allow people underneath.

Personnel working on the pump must always

wear clean, correctly fitting clothing and safety

footwear. Clothing impregnated with oil or fuel can

constitute a health hazard through prolonged contact

with the skin and may also constitute a fire hazard.

Check the type of liquid that the pump has

been employed on before working on them. Residues

could be hazardous to your health. If in doubt, flush

thoroughly with clean water before commencing work.

Rotating equipment presents a hazard in

itself. Alert surrounding personnel before starting and

post notifications whilst in operation.

Moving parts are guarded to protect you.

Guards removed for maintenance must be replaced

before starting the pump.

Never insert anything into the pump body

whilst the pump is running and the suction or delivery

hoses are disconnected.

Use all flange bolt holes and ensure the

correct bolt size and quality is utilised when connecting

suction and delivery hoses.

Collapsible hoses must never be used on the

suction side of the pump.

Keep the hose end suction area free from

debris. Although the pump can handle solids up to the

size indicated in the Technical Data section of this

manual, larger or irregular solids may cause blockage

with damage to pump components.

Always allow adequate ventilation for the

pump driver. Diesel engines require air for both

combustion and cooling. This air must never be

allowed to re-circulate.

Be aware of burn and fire risks from items

such as exhaust pipes and silencers. Never place

flammable items around the unit.

Liquid pressure may still be present even

after shutdown of the pump. Particular attention should

be paid to delivery lines that are long, or rise through

any height, as these can contain large volumes of

liquid. These lines must be isolated and drained down

before commencing work. Sudden release of this liquid

can cause serious injury to an operator either directly

or indirectly through the rotational motion it can induce.

WARNING! Delivery hose and any associated

pipe work should be capable of withstanding the

maximum system operating pressure. Selwood

recommend the minimum pressure rating of 16 bar

hose. Suction hose should be of the non-collapsible

variety.

WARNING! The pump should only be

operated within the speed and pressure limits

detailed in Section 1.7 of this manual.

1. If there is a danger of freezing, the fluid, normally

retained within the pump between operating

cycles, should be drained off through the drain tap

provided.

2. WARNING! Never start or run the pump

against a closed delivery valve (except the pump

non return valve). Failure to comply may result in

damage to the unit or personal injury.

3. WARNING! Noise level at operator

position (Start Panel) may exceed 80dB (A).

Hearing protection must be worn at all times within

the canopy when the unit is running. Failure to

comply may result in hearing damage or loss.

Selwood H100 Manual

SELWOOD H100 CONTENTS

Title Page

Safety Precautions.................................................... 2

1.0 GENERAL INFORMATION .................................. 4

1.1 Installation............................................................. 4

1.2 Operation 4

1.3 Maintenance ......................................................... 4

1.4 I.C. Engines .......................................................... 4

1.5 Electric Motors ...................................................... 4

1.6 Fitting Instructions for Fenner Couplings

(Electric Motors)............................................... 4

1.7 Selwood H100 Standard Data............................... 5

2.0 ROUTINE MAINTENANCE .................................. 6

3.0 LUBRICATION AND FASTENING TORQUES .... 6

3.1 Pump Lubrication .................................................. 6

3.1.1 Commissioning Period ..................................... 7

3.1.2 After Commissioning Period............................ 7

3.1.3 Main Pump Bearings........................................ 7

3.2 Fastening Torques ................................................ 7

4.0 CONDITIONS OF WARRANTY............................ 7

5.0 MAJOR SERVICING ............................................ 8

5.1 Air Pump Maintenance.......................................... 8

5.1.1 Delivery and Suction Valves............................ 8

5.1.2 Actuator Valve................................................... 8

5.1.3 Actuator Seal..................................................... 8

5.1.4 Actuator Neck Seal........................................... 9

5.1.5 Linear Bearing and Seals................................. 9

5.1.6 Air Pump Mechanism....................................... 9

5.1.7 Eccentric Shaft................................................ 10

5.1.8 Lip Seal............................................................ 10

5.1.9 Roller Bearings................................................ 11

5.1.10 Con Rod and Drive Rod............................... 11

5.1.11 Drive Belt ....................................................... 11

5.1.12 Drive Belt Tension ........................................ 11

5.1.13 Air Pump Assembly...................................... 11

5.2 Separator Maintenance........................................11

5.2.1 Float................................................................. 11

5.2.2 Peel Valve ....................................................... 12

5.2.3 Deposits of Solids ........................................... 12

5.3 Impeller, Mechanical Seal, Wear Plate and

Delivery Valve Maintenance ...........................13

5.3.1 Impeller............................................................ 13

5.3.2 Setting Impeller Clearances........................... 14

5.3.3 Mechanical Seal ............................................. 14

5.3.4 Front Wear Plate............................................. 15

5.3.5 Rear Wear Plate ............................................. 15

5.3.6 Delivery Valve ................................................. 15

5.4 Maintenance of Lip seals, Headland V Seal,

Bearings and Main shaft. ................................16

5.4.1 Lip Seals.......................................................... 16

5.4.2 Headland V Seal............................................. 17

5.4.3 Bearings .......................................................... 17

5.4.4 Main Shaft ....................................................... 18

5.5 Chassis Maintenance...........................................19

5.6 Super Silent - Canopy Removal...........................19

5.7 Super Silent - Fuel Tank removal.........................19

5.8 Super silent – Fuel Tank Refitting ........................19

5.9 Super silent – Canopy Refitting............................20

6.0 WORKSHOP TOOLS ..........................................21

6.1 Care of Servicing Tools........................................21

USE OF SERVICE TOOLS........................................21

6.2 Fitting of Actuator Neck Seal................................21

6.3 Removal of Mechanical Seal Stationary Seat

and Joint Ring ................................................ 21

6.4 Removal of Linear Bearing Seal Assembly.......... 22

6.5 Fit Air Pump Pedestal with Seals to Air Pump

Bearing Housing.............................................22

6.6 Remove Pedestal Bush ....................................... 22

6.7 Fit New Pedestal Bush ........................................ 22

7.0 FAULT FINDING GUIDE..................................... 23

8.0 PARTS LIST........................................................29

8.1 Air Pump Drive Assembly 1502021000 ...............29

8.2 Air Pump Assembly 1502021000 ........................31

8.3 Delivery Valve Assembly 1309178000 ................ 33

8.4 Bearing Housing Assembly 1501378100.............35

8.5 Separator Assembly 1589162000 ....................... 37

8.6 Bearing Housing and Body Casing...................... 39

8.7 H100 Pump Unit 1309160000 .............................41

Selwood H100 Manual

1.0 GENERAL INFORMATION

1.1 Installation

The pump unit and its associated base plate

or trolley mounting should be positioned on a firm

horizontal platform, and in the case of portable units

restrained from accidental movement.

If the pump is fitted with push-on type suction

and delivery spigots the hoses must be firmly secured

on these spigots with heavy duty clamps or clips

capable of withstanding the system operating

pressure.

The integrity of the hose clamping

arrangements should be checked at regular daily

intervals in the case of static installations or whenever

the pump is repositioned in the case of portable units.

Similar precautions should be taken with

clamps securing multiple lengths of hose on installation

where long delivery and suction lines are involved.

Delivery hose and any associated pipe work

should be capable of withstanding the maximum

system operating pressure. Suction hose should be of

the non-collapsible variety.

1.2 Operation

1. The pump should only be operated within the

speed and pressure limits detailed in the operating

handbook for the model in question.

2. If there is a danger of freezing, the fluid normally

retained within the pump between operating

cycles should be drained off through the drain taps

provided.

3. Where protective caps are used to prevent

damage to the suction and delivery spigots during

storage or in transit they must be removed before

the pump is started up.

1.3 Maintenance

Inspection and maintenance procedures are

detailed in the operating and servicing manual for the

model in question.

Replacement parts. Only the manufacturers

or factory approved components should be used as

replacement parts and where necessary they should

be fitted with the assistance of the special purpose

tools indicated in the operating and servicing manual.

All maintenance work must be carried out with

the pump and engine/motor stationary.

1.4 I.C. Engines

1. Where I.C. engines are used to power the pump

they have been mounted in accordance with the

engine manufacturers’ recommendations and

adequate guarding provided between the pump

and engine.

2. Exhaust and Exhaust Pipes. If there is a risk of

accidental contact by operators, the exhaust

system should be lagged or screened and the

outlet directed away from operators or other

persons likely to be nearby. Direct contact with

flammable materials of all types must be avoided.

The importance of adequate ventilation to ensure

removal of exhaust fumes when engines are

operated in enclosed or covered accommodation

cannot be over-stressed. Engines should not be

run in hazardous explosive atmospheres.

3. Access and Operation. Ensure that the operator

can start, control and stop the engine easily by

making all controls readily accessible. Fit remote

controls if access is difficult. Follow the

instructions laid down in the Engine

Manufacturer's Operators Handbook for starting,

operating and stopping procedures.

4. Fuel. In addition to the fire hazard associated with

fuel and lubricating oils, preventative action is

necessary with respect to leakage, contamination

and bodily contact.

5. Electrical Connections. It is essential that earth

terminals are connected with an absolutely sound

earth point and care should be taken to ensure

that the correct sized conductors are selected to

suit the current and distance to be carried.

1.5 Electric Motors

All electrical connections should be made

through adequately rated conductors and starters.

Isolators and other associated switchgear should be of

adequate capacity for the imposed power loadings. All

electrical equipment should be adequately earthed.

Isolate the power supply before carrying out

any commissioning, servicing or maintenance work on

the pump or electric motor.

Where electric motors are to be operated in

hazardous or explosive atmospheres they should be of

the flameproof enclosure type appropriate to that

atmosphere.

You are requested to take such steps as are

necessary to ensure that this information is made

available to all those involved with the use of our

products. This information must be made available not

only to your own employees at their workplace, but

also to anyone who may purchase or otherwise

acquire (hire) such products for use in his own

workplace.

It is our intention constantly to review our obligations

under the Act and we will be issuing from time to time

further information with regard to the safe application,

use, inspections, and service associated with our

products.

1.6 Fitting Instructions for

Fenner Couplings (Electric Motors)

Adjust position of pump on chassis until the

inside faces of the coupling flanges are parallel to each

other. The distance between the faces should

Selwood H100 Manual

measure from 24 to 29mm (15/16” to 1 1/8”). Whilst

adjusting the pump’s position, it is also necessary to

achieve alignment of the shaft centre-lines within

1.5mm (1/16”) of each other by laying a straight edge

cross the two flanges at several positions around their

circumferences. Fully tighten the nuts immediately the

coupling flanges are correctly aligned. Recheck

alignment after tightening.

The flexible coupling assembly should now be

completed. Open-out the tyre and fit over the coupling

flanges ensuring the tyre beads seat properly on the

flanges. To ensure proper seating, it may be

necessary to strike the outside diameter of the tyre

with a small mallet. When seated there should be a

gap between the ends of the tyre of about 1/8” (3mm).

Tighten clamping ring screws in flange alternately and

evenly (approximately half a turn per screw) working

round the flange until 17lbf ft (2.35kgf m) torque is

achieved.

1.7 Selwood H100 Standard Data

Capacity (max) 225M3/h

49,493 UK gal/h

Delivery Head (max) 120m

396ft

Impeller Diameter 368mm

Self-Priming Lift (max) 8.8m H20

29ft H20

Solids Size (max) 29mm

1.14in

Air Handling Capacity:

Single 24l/s

Prime 50ft3/min

Twin 48l/s

Prime 100ft3/min

Pump Speed 2200rpm Max

Port Size BS EN 1092-2 2007 PN16 100mm

4in

Maximum pumped fluid temp 40 degree C

Selwood H100 Manual

2.0 ROUTINE MAINTENANCE

Lack of routine maintenance is the most frequent

reason for the breakdown of pumps. We earnestly

advise users to ensure that at least the following

actions are taken.

•Check these three oil levels daily:

•Engine oil.

•Air pump bearing housing oil.

•Flushing chamber oil.

•Always drain water from the pump in cold weather

when it is not running. Drain:

Pump body.

•Delivery valve chamber.

•Both sides of air pump (4 drain taps if twin prime).

Do NOT run the pump if significant quantities

of water escape through the exhaust valve of the air

pump. This pump is designed to handle moisture-

laden air, but not to pump a high percentage of water.

Refer to servicing instructions for further advice.

Do NOT run the pump if malfunction is

suspected in any of its parts. In particular, it must

immediately be serviced if the level of oil in the flushing

chamber varies daily, or if the oil becomes

contaminated with the pumped fluid.

A hose strainer should always be fitted to the

free end of the suction line if there is a possibility of

oversized solids entering the pump. The dimensions

of rocks, pebbles, etc. must not exceed 30mm.

As loss of prime and indeed loss of on-stream

performance can easily arise as the result of leaking

pipe work joints, we recommend that all line fittings

associated with the pump should be checked

periodically for air-tightness.

It is most important to use the correct fuel oil

in the engine. Make sure that it is appropriate for the

weather conditions (summer or winter) and that it is

clean and free from water and foreign matter.

Unsatisfactory running performance, excessive wear

and damage can all result from the use of an Incorrect

or contaminated fuel.

Periodically check the tension of all nuts and

bolts, especially those securing the engine and pump

to the chassis.

Pump servicing must always be carried out in

accordance with the instructions given in this manual.

Only components supplied and approved by Selwood

Ltd should be used. It is advisable to hold a small

stock of spare parts to cover breakdown

circumstances. The Company will be pleased to give

advice in this connection.

Engine servicing must always be carried out

in accordance with the instructions given in the

manufacturer's manual. Do not hesitate to contact

Selwood Ltd if the need for further advice arises.

Please contact Selwood Ltd in the event of

experiencing difficulty when servicing. The company

will also be very pleased to give advice in connection

with the machine's installation, operation and

maintenance.

All practical work must be carried out in

compliance with the Health and Safety at Work Act,

1975. Always start the engine in accordance with the

manufacturer's instructions.

NOTE: If the above advice is followed, the likelihood

of an expensive break down will be greatly diminished.

The pump should give a long and trouble free life if

these measures are put into effect.

3.0 LUBRICATION AND

FASTENING TORQUES

3.1 Pump Lubrication

It is most important to maintain the correct levels of oil

in the flushing chamber and bearing housing, and to

ensure that the oil is of the recommended quality and

is free from contamination. Selwood recommend the

use of the following BP/ Castrol products, which should

be applied as per the following table. In some

territories, the following grades may be known under

differing trade names, please contact Selwood if

problems occur in identifying the correct product.

COMPONENT BP GRADE

ENGINES Refer to manufacturers

handbook

Bearing Housing BP Energrease LS-EP2

Flushing Chamber C5 Global

Actuator Bore Castrol Rustilo 431

Air Pump Bearing Hsg C5 Global

Main Bearing housing BP Energrease LS-EP2

Paper Gaskets BP Energrease LS-EP2

M10 Screws - Port Plate

to Diffuser

Castrol Optimoly Paste

COMPARTMENT

DRAIN INTERVAL

CHANGE

OIL &

FILTERS

CHECK &

TOP UP

Engine Sump

PERKINS/CAT 500 Hours Daily

Engine Sump DEUTZ 750 Hours Daily

Air Pump Bearing

Housing 500 Hours Daily

Flushing Chamber 500 Hours

Main Bearing housing

regrease 3000 hours 500hrs

Actuator Bore

Impeller Bore

Shaft Sleeve Bore

ASSEMBLY

Paper Gaskets

Axle Shafts

Axle Pivot Assembly

ASSEMBLY 6 - 12

M10 Screws - Port Plate

to Diffuser

ASSEMBLY

Selwood H100 Manual

3.1.1 Commissioning Period

Drain both pump chambers and engine within 50-100

running hours of commissioning either a new or rebuilt

pump, and refill with new oil to dipsticks level mark.

Air Pump bearing housing. 1.2litres approx.

Mechanical seal chamber 1.8litres approx.

and Oil Reservoir.

Engine sump: Refer to the engine Instruction Book.

3.1.2 After Commissioning Period

If the pump is driven by a diesel engine, the oil in both

pump chambers should be drained and renewed

simultaneously with the time schedule laid down by the

engine manufacturer. Under no circumstances should

the period for the pump exceed 750 running hours.

3.1.3 Main Pump Bearings

1. Run pump to warm up bearings and keep running.

2. Remove 1/8" BSP vent plugs from bearing

housing.

3. Charge each grease point with 20-25 grams of BP

Energrease LS-EP2.

4. Leave pump running for about 30 minutes to allow

any excess grease to escape through vents.

5. Replace 1/8" BSP plugs.

NOTE: Do not exceed recommended quantities of

grease, as overheating will occur, leading to

premature bearing failure.

If excess grease should cause overheating it will

be necessary to remove the excess by first

removing the bearing covers, see General

Maintenance.

Under normal conditions the bearing housing

temperature should be sufficient to maintain hand

contact.

3.2 Fastening Torques

Failure to tighten threaded fasteners correctly can

easily lead to assembly breakdown. It is very

important, therefore, when carrying out the instructions

in this manual, to achieve the appropriate tensioning

torques. In some cases, specific requirements are

described in the instructions, which must always be

implemented. The following torques, in particular,

must be applied.

Item Torque

lbf-ft

M12 Actuator cap screw 81.3 60

M12 Air pump inner body to

pedestal capscrew

95.0 70

M16 Impeller to shaft capscrew 122.0 90

Torque all fasteners as follows unless otherwise

stated.

Diameter Torque Nm lbf-ft

M6 11.7 8.6

M8 28 20.7

M10 56 41.3

M12 98 72.3

M16 244 180

4.0 CONDITIONS OF

WARRANTY

For a period of twelve months from delivery of any

Selwood pump to the first user thereof, or eighteen

months from the despatch of any such pump by

Selwood, whatsoever period is the shorter, Selwood

will repair or, at its option, replace any component

which in the opinion of Selwood has failed due to

defective workmanship or materials.

For full terms and conditions please contact Selwood

Ltd.

Selwood H100 Manual

5.0 MAJOR SERVICING

5.1 Air Pump Maintenance

5.1.1 Delivery and Suction Valves

Failure of the pump set to prime quickly or to discharge

the expected volume of air, may simply be due to faulty

valve operation.

To inspect and service, proceed as follows:

1. Remove air hose from suction valve box, after

loosening relevant hose clip.

2. Note the orientation of the suction valve box and

exhaust cover before commencing. Remove

exhaust cover and suction valve box by releasing

nuts and spring washers.

NOTE: The above actions allow the condition of the

two valve rubbers to be checked. Do NOT attempt to

remove valve studs. If valve rubbers are damaged,

replace with new components. Pull old valves off stud

heads, and discard.

Check and, if necessary, clean valve seats in

outer pump body and valve box. Smear heads and

grooves of studs with soft soap and push on new

valves ensuring that they seat correctly.

The valve assemblies can now be replaced

by reversing Instructions 1 and 2 of this procedure. It

is advisable to fit new gaskets.

5.1.2 Actuator Valve

Another reason for the pump set failing to prime

efficiently or to handle the expected volume of air could

be malfunction of the actuator valve.

To inspect and service, proceed as follows:

1. Remove nuts, spring washers, washers and

screws, allowing outer pump body to be removed

complete with attached delivery valve assembly.

The actuator valve may now be examined. If it

fails to seat efficiently on actuator or is in any way

damaged, it should be pulled off the actuator nut

and discarded.

2. Whilst the actuator valve is removed, it is

advisable to examine the condition of the valve

seat in the actuator, and also check the security of

the actuator screw. This should be tight to 60lbf ft

(8.3kgf m) torque.

To replace actuator valve:

Smear soft soap on the conical end and groove of

actuator screw. Now ease new valve rubber into

position ensuring that it seats correctly.

NOTE: It is advisable to examine the condition of

actuator seal whilst it is exposed. Refer to Section 0

5.1.3 Actuator Seal for servicing instructions.

To replace outer pump body assembly, fit and

evenly tighten screws, washers, spring washers and

nuts, by sequentially turning each screw a small

amount until they are all fully tensioned.

NOTE: It is important that the outer diameter of the

actuator seal should be evenly clamped.

5.1.3 Actuator Seal

A further reason for the pump set failing to prime

efficiently or to handle the expected volume of air,

could be a faulty actuator seal.

To inspect and service, proceed as follows:

1. Remove outer pump body complete with delivery

valve assembly. Remove actuator screw.

2. Set actuator to top dead centre (maximum

distance from inner pump body), by rotating

engine shaft with starting handle. Using a tool that

will not cut the rubber (such as a blunt

screwdriver) and a lubricant (soap solution),

remove actuator seal by prising it from the inner

pump body.

3. Remove actuator complete with seal from drive

rod.

4. To renew actuator seal:

5. Remove the failed component from the actuator.

6. Insert firstly one side and then the other into the

actuator groove, using a blunt tool that will not cut

the rubber.

NOTES: The seal is handed and will not enter the

inner pump body if fitted the wrong way round. The

correct assembly position for actuator seal is with the

smaller diameter of its conical outer surface towards

the inner pump body. It will be seen that the housing in

the body is tapered in the same direction as the

external surface of the seal.

7. At this stage it is advisable to examine the

condition of actuator neck seal. This component

should be replaced if any splits are evident on its

visible surface. Refer to Section 0 5.1.4 Actuator

Neck Seal.

8. Smear soft soap on the outside section of new

actuator seal. Lightly grease actuator bore.

Position actuator/seal assembly on the drive rod,

locate the actuator screw and tighten to 60lb/ft

(8.3kgf m) torque.

9. Replace actuator valve if removed first smearing

soft soap on the conical end and groove of

actuator screw. The new valve should be eased

into position by hand.

10. Before fitting outer pump body, reciprocate the

actuator by fitting and rotating the engine's starting

handle about ten times to encourage centralisation

of the connecting rod bearings. During this

procedure, the actuator seal is likely to rotate

slightly in the inner pump body. Stop shaft rotation

when actuator is at bottom dead centre (minimum

distance from inner pump body).

11. Seat outside section of actuator seal in inner

pump body recess by gently tapping with a non-

metallic mallet.

12. Replace outer pump body assembly, and fit and

evenly tighten screws washers, spring washers

and nuts, by sequentially turning each screw a

small amount until they are all fully tightened. It is

Selwood H100 Manual

important that the outside diameter of the actuator

seal should be clamped evenly.

5.1.4 Actuator Neck Seal

Another reason for the pump set failing to prime

efficiently or to handle the expected volume of air could

be failure of the actuator neck seal.

To investigate and service, proceed as follows:

1. Remove outer pump body complete with delivery

valve assembly, and actuator with actuator seal as

directed in Section 0 Seal Instructions 1 and 2.

2. Release hose clip allowing air hose to be

disconnected from suction valve box Screws

should then be removed, leaving washers in inner

pump body.

3. The inner pump body can now be pulled by hand

from the air pump bearing housing, if necessary

twisting to overcome any tendency of the seal to

stick to drive rod. Remove and discard failed seal.

4. Smear new actuator neck seal with soft soap to

assist fitting, position in inner pump body and push

both components over drive rod using assembly

tool (Part No. 0015102000) smeared with soft

soap. Check that washers are in place, and fit

and fully tighten screws. The heads of these

screws should be fully contained within the

recesses in the inner pump body.

Reassemble remaining components in

accordance with Section 0 Seal Instructions 8 to 12,

inclusively.

5.1.5 Linear Bearing and Seals

If oil leaks from ports in air pump pedestal it is

probable that seals are excessively worn. Such a

condition may also indicate that pedestal bush should

be replaced.

To inspect and service, proceed as follows:

1. Drain oil from air pump bearing housing by

removing drain plug and sealing washer.

2. Remove air pump components in accordance with

Section 0 Seal Instructions 1 and 0, and to Section

0 Seal Instructions 2 and 3.

3. Being careful not to damage the flat sealing faces

of air pump pedestal, carefully withdraw pedestal

complete with its bearing and sealing components

from the air pump bearing housing and drive rod.

4. Carefully remove circlip and withdraw seal carrier

complete with seal. Remove seal from housing.

Use bearing drift, Service Tool (0015168000) to

push out linear bearing. Examine condition of

wiper and distributor seals together with bearing.

If either are worn or damaged, we recommend

that new seals and bearing should be ordered and

fitted in accordance with the following instructions.

5. To replace linear bearing carefully remove circlip

allowing seal components to be pushed from

pedestal with blunt punch or drift from bearing

end. The drive rod bearing can now be removed

using bearing drift (Part No. 0015168000) and the

new component pressed into position so that one

face is flush with base of bearing location within

the pedestal.

6. Ensure that seal components are assembled in

accordance with the following instructions.

7. The wiper seal is first assembled to the seal

carrier using wiper seal insertion tool (Part No.

0010103000) with wiper lip uppermost.

8. Then lubricate seal housing and press in internal

distributor seal with lip nearest bearing. Push into

place with seal carrier together with wiper seal and

the whole pressed into place with the wiper seal

insertion tool (Part No. 0010103000). Care must

be exercised when replacing circlip to ensure that

the lip of the wiper seal is not damaged by the

hand tools used. Refer to Section 6.4.

9. Before replacing air pump pedestal assembly,

check condition of drive rod, particularly if new

bush has been fitted. If surface is significantly

worn, the drive rod should be replaced in

accordance with instructions given in Section 0.

10. Assembly tool (Part No. 0015101000) must be

used when replacing bearing/seal housing

assembly to ensure that the wiping edges of the

seals are not damaged. The drive rod must be

smeared with clean oil to assist this procedure.

See Section 6.5. Gasket must be renewed.

Always use a component supplied by Selwood

Ltd. Ensure that ports in the air pump pedestal

are in the 3 and 9 o'clock positions.

Reassemble remaining pump components in

accordance with Section 0 Seal Instruction 4 and 0

5.1.3 Actuator Seal Instructions 8 to 12, inclusively.

Replace drain plug together with sealing

washer and refill bearing housing with clean oil to

maximum level on dipstick plug. Refer to Section 3.1

Pump Lubrication for details of the oil required for the

air pump bearing housing.

5.1.6 Air Pump Mechanism

Should actuator fail to reciprocate when the pump is

running, or if other abnormal conditions are suspected,

the air pump mechanism should be immediately

inspected to minimise the risk of consequential

damage.

Proceed as follows:

1. Drain oil from air pump bearing housing and

flushing chamber by removing drain plug and

sealing washer.

2. Remove air pump components in accordance with

Section 0 Seal and Section 0 Seal Instructions 2

and 3 (discard actuator neck seal if it has failed).

3. Being careful not to damage the flat sealing faces

of pedestal carefully withdraw pedestal complete

with bearing and sealing components from air

pump bearing housing and drive rod.

4. Carry out Section 0 Shaft removal Instructions 8 to

18, inclusively.

5. Carefully remove drive rod and connecting rod. If

second priming pump is fitted, repeat these

operations, ensuring that the connecting rod,

fulcrum pin and drive rod components are kept as

Selwood H100 Manual

sets, and can later be reassembled in their original

positions.

6. Examine condition of all components and renew

failed or significantly worn items. A replacement

connecting rod, complete with bushes, should be

ordered against sub-assembly (Part No.

1589102000).

To rebuild mechanism carry out Section 0

Shaft fitting Instructions 1 to 4, inclusively.

5.1.7 Eccentric Shaft

Removal

1. Remove air pump components in accordance with

Section 0 Seal instructions 1 and 2 and to Section

0 Seal instructions 2 and 3.

2. Remove belt guard and pulley by releasing taper

lock.

3. Remove key.

4. Remove 3/8" BSP drain plug and sealing washer;

drain and discard oil.

5. Remove four M8 hexagon socket head capscrews

and spring washers.

6. Use two M8 tapped holes in air pump pedestal

flange to jack off dowels.

7. Carefully remove the air pump pedestal complete

with seals and linear bearing; remove and discard

gasket. Take special care not to damage the drive

rod surface.

8. Remove four M6 hexagon head screws and spring

washers from bearing cover.

9. Remove bearing cover and gasket; discard

gasket.

10. Bend back tabs and remove bearing locknut use

'C' spanner 1590180000.

11. Remove tab washer.

12. Remove four M6 hexagon head screws and spring

washers from bearing cover.

13. Remove bearing cover complete with lip seal.

14. Remove gasket and discard.

15. Carefully pull shaft from housing complete with

circlip, washer and inner race of bearing.

NOTE: It may assist dismantling if panel is

removed. Take great care not to damage shaft,

drive rod and bearings.

16. Remove con-rod/drive rod assembly and inspect

bearing bushes.

17. Remove circlip and washer.

18. Use a bearing puller to remove inner race of

bearing from shaft.

Fitting

1. Apply a few drops of Loctite 641 to the shaft and

slide inner race of bearing onto its seat.

2. Fit washer and circlip.

3. Carefully slide shaft and bearing assembly into

housing through the con-rod bearing bush and

engage shaft end in bearing.

4. Fit tab washer engaging locating tab in shaft

groove.

5. Fit bearing locknut and tighten with 'C' spanner;

bend lock washer tab into groove.

6. Fit bearing cover and new gasket, secure with four

M6 hexagon head screws and spring washers.

7. Fit bearing cover complete with lip seal and new

gasket; secure with four M6 hexagon head screws

and spring washers.

8. Fit new gasket.

9. Fit Service Tool 0015101000 to drive rod, and

carefully lower the air pump pedestal, complete

with seals and linear bearing, over. Locate

pedestal flange over dowels and secure with four

M8 hexagon socket head capscrews and spring

washers.

Reassemble remaining air pump components

in accordance with Section 0 Seal instruction 4 and

Section 0 instructions 8 to 12 inclusively.

1. Refit key, pulley, taper lock bush, and belt.

2. Align pulley with pulley and tighten taper lock.

3. Refit belt guard.

4. Refill bearing housing with oil.

5.1.8 Lip Seal

Removal

1. Remove drain plug and sealing washer; drain and

discard oil.

2. Remove belt guard.

3. Release taper lock bush and remove with pulley;

remove key.

4. Remove four M6 hexagon head screws and spring

washers from bearing cover.

5. Remove bearing cover complete with lip seal.

6. Remove and discard gasket.

7. Pull lip seal from housing and discard.

Fitting

1. Clean and lubricate seal housing. Press in lip seal

fully against abutment; lip nearest the bearing.

2. Lubricate shaft sealing surface.

3. Fit new gasket on bearing cover and slide

assembly over shaft. Engage spigot and align

screw holes.

4. Secure to bearing housing with four M6 hexagon

head screws and spring washers.

5. Refit key, taper lock bush, pulley and belt.

6. Align pulley with pulley and tighten taper lock

bush.

7. Replace belt guard.

8. Fill bearing housing with oil.

Selwood H100 Manual

5.1.9 Roller Bearings

To investigate and service, proceed as follows:

1. Remove air pump components in accordance with

Section 0 Seal instructions 1 and 2, and Section 0

Seal instructions 2 and 3.

2. Remove air pump drive components in

accordance with Section 0 Shaft removal

instructions 1 to 18 inclusively.

3. Examine bearings for excessive wear and replace

both if either or both are worn.

4. Fit new bearings to drive shaft and refit into

bearing housing in accordance with Section 0

Shaft fitting instructions 1 to 4 inclusively.

5. Reassemble remaining air pump components in

accordance with Section 0 Seal instruction 4 and

Section 0 Seal instructions 8 to 12 inclusively.

5.1.10 Con Rod and Drive Rod

It is recommended that these items be purchased

ready assembled with bearings finish machined and

reamed:

•Con-rod assembly - Part No. 1589102000,

consisting of air pump connecting rod, two small

end bushes and a large end bush.

•Drive rod assembly - Part No. 1589103000,

consisting of air pump drive rod and drive rod

bush.

To investigate and service, use fitting and removal

procedures Section 0 5.1.9 Roller Bearings.

5.1.11 Drive Belt

Another reason for the pump set failing to prime

efficiently, or handle the expected volume of air could

be the poor condition of the air pump drive belt or

pulleys.

To investigate and service, proceed as follows:

1. Remove air pump pulley guard.

2. Remove one half of coupling guard.

3. Remove rubber coupling element.

4. Release taper lock bush on the air pump shaft.

5. Carefully remove belt and examine for tooth

damage and cracking. If faulty replace with new

belt.

6. Check pulleys for damage. Change if required in

accordance with pulley manufacturer’s

instructions.

7. Thread the toothed belt between the flywheel plate

and pump shaft end and over the pulleys and.

8. Line up air pump pulley with main shaft pulley and

tighten the taper lock bush.

9. Check belt tension and adjust if necessary. See

Section 0.

10. Reassemble coupling and guards.

5.1.12 Drive Belt Tension

Required Tension

A load of 18N (4.0Ibf) applied across the belt at mid

pan should give a deflection at that point of 4.9mm

0.19ins). This may be measured using a spring

balance, bar, and dial indicator.

Adjustment

The belt tension is set by varying the distance between

pump and air-pump shaft centres using shims.

5.1.13 Air Pump Assembly

Sometimes it is more practical to service the air pump

away from the main pump assembly.

To allow remote service proceed as follows:

1. Remove drive belt as directed in Section 0 5.1.11

Drive Belt, instructions 1 to 5.

2. Disconnect separator hose and silencer hose.

3. Remove four M12 hexagon socket capscrews and

spring washers.

4. Insert two screws in the tapped holes midway

along the pump bearing housing flanges and jack

the air pump assembly off the dowels.

5. Retain shims and note positions.

6. Carryout the relevant servicing required.

7. Replace shims or reselect new shims by following

the adjustment procedure Section 0 5.1.12 Drive

Belt Tension.

8. Fit air pump bearing housing flange over dowels,

fit four spring washers and four M12 hexagon

socket capscrews. Pull the air pump down evenly.

9. Reassemble belt as Section 0.

10. Check belt tension as Section 0.

11. Refit guards and air pump hoses.

5.2 Separator Maintenance

5.2.1 Float

If water in significant quantities continuously passes

through the exhaust valve of the air pump, it is

probable that the float is in need of replacement.

To inspect and service, proceed as follows:

1. Disconnect air hose by loosening hose clip.

2. Remove nuts and washers and lift off separator

cap complete with peel valve/upper diffuser

assembly.

3. Examine condition of float and replace with new

component if punctured or significantly worn.

4. Check condition of peel valve rubber and bush

replacing them, if necessary, in accordance with

Section 0 5.2.2 Peel Valve. Also check for

deposits of solids likely to interfere with the

smooth working of the float system.

When fitting a new float, ensure that it is

securely tightened against nut. During this procedure

the float should be positioned on the rod so that the

Selwood H100 Manual

operating plate with its associated peel valve fasteners

is just clear of the central clamp bar screws, when the

float is located in the upper diffuser cone.

If all components are seen to be in

satisfactory condition, replace separator cap assembly,

washers and nuts. Alternately tighten each nut a small

amount to ensure that the cap is pulled down evenly.

Do not over tighten. Replace air hose and re-tension

hose clip.

5.2.2 Peel Valve

If significant quantities of water are discharged from

the exhaust valve of the air pump, and the float is in

satisfactory condition, it is probable that a fault exists in

the peel valve assembly.

To inspect and service, proceed as follows:

1. Remove separator cap sub-assembly and

unscrew float and nut.

2. Release screws and spring washers to allow

upper diffuser/valve assembly to be withdrawn.

3. Remove screws and sealing washers to allow

upper diffuser to be removed from the port plate

sub-assembly.

4. Examine condition of peel valve rubber and air

ports in plate which it should completely cover

when the float is fully raised. If the rubber does

not seat correctly, is distorted, or in any way

damaged, it must be removed and discarded by

releasing screws.

5. To fit new peel valve rubber:

Carefully clean existing parts thoroughly,

especially surfaces of port plate, and clamp

bars and position new rubber on plate.

Assemble screws, clamp bar, clamp bar seal,

washer and nuts in sequence shown on

drawing. Alternately tighten each nut a small

amount to ensure that even clamping

pressure is produced. Correctly tightened

nuts will not cause the clamp bar to distort the

rubber.

6. Carefully attach the ends of the valve rubber to the

operating plate, noting that the components and

method of assembly are identical to those

described in Instruction 5 of this Section except

that clamp bar seal is omitted. Again, ensure that

the nuts are not over tightened.

7. After completing Instructions 5 and 6 of this

Section, check that the peel valve rubber is

capable of closing all of the air holes in port plate

when operating rod is square to the plate and fully

lifted.

8. Check condition of bush in upper diffuser and

replace, together with clip and nitrile washer, if

significantly worn.

NOTE: The operating rod is normally a slack fit in the

bush.

9. Position port plate sub-assembly on upper

diffuser, fit washers, after checking that they will

seal efficiently and fully tighten screws.

Reassemble nut and screw float on to operating

rod and tighten securely in accordance with

Section 0 5.2.1 Float Instruction 0.

10. Recheck operation of peel valve rubber to ensure

that it fully covers air ports in plate when the float

is located in the upper diffuser cone. In this

position there should be a gap of

3.5 mm between the heads of the centre clamp

bar screws and the operating plate. If the

dimension is incorrect, adjust position of float on

operating rod.

11. Examine condition of gasket and renew, if

necessary, before installing between port plate

and separator cap. Fit spring washers and screws

each of which should be sequentially turned a

small amount until fully tightened. Gasket must be

evenly compressed.

12. Replace separator cap sub-assembly in

accordance with Section 0 5.2.1 Float Instruction

5.2.3 Deposits of Solids†‡

When handling liquids containing solids capable of

adhering to product wetted surfaces, it is advisable

periodically to check the valve system in the separator.

To inspect and service, proceed as follows:

1. Remove separator cap sub-assembly in

accordance with Section 0 5.2.1 Float Instructions

1 and 2, allowing separator body together with

lower diffuser, to be lifted off the suction tube.

2. Remove any deposits of scale from lower diffuser

and check condition of welds securing its circular

bottom to the perforated cylinder. Remove any

solids that may have accumulated in the suction

tube, renew gasket and reposition separator

body/lower diffuser assembly on suction tube.

3. Remove deposited materials from surfaces of

upper diffuser and note, in particular, condition of

welds securing cone and disc to perforated

diffuser body. Also examine diffuser bush and

operating rod, and replace if significantly worn in

accordance with Section 0 5.2.2 Peel Valve

Instructions 3 to 11. Remove all deposited solids

that would interfere with the free movement of the

mechanism, obstruct the passage of air across the

port plate holes, or inhibit the flow of water

(through the holes in the upper diffuser, for

example).

4. Once it is established that all components are in a

satisfactory condition and are free from scale,

replace separator cap sub-assembly in

accordance with Section 0 5.2.1 Float Instruction

0. Any re-assembly work carried out on the peel

valve assembly should be in accordance with

Section 0 5.2.2 Peel Valve commencing with

Instruction 1.

Selwood H100 Manual

5.3 Impeller, Mechanical Seal,

Wear Plate and Delivery Valve

Maintenance

5.3.1 Impeller

Generally speaking, it is only necessary to remove the

impeller if the existing component has become

severely abraded, or if access to other rotating parts is

required.

To remove and replace, proceed as follows:

1. Drain oil from the mechanical seal chamber and

reservoir by removing the 3/8" BSP plug at the

bottom of the seal chamber. The condition of the

oil will indicate whether or not the mechanical seal

has been functioning correctly. If contamination is

evident, the mechanical seal must be replaced in

accordance with Section 0 Back Clearance

This should be checked using feeler gauges. This is

only possible by removing the volute from the rear

cover and bearing housing. This is done by removing

12 x M12 nuts and washers holding the volute and rear

cover plate together and then separating the two

component parts. Leave the rear cover plate attached

to the bearing housing. If adjustment is required:

1. Remove impeller in accordance with Section

5.3.1 Impeller, instructions 1 to 9 inclusively.

2. Add or remove shims (1310366000 = 0.1mm,

1310365000 = 0.25mm or 1310242000 =

0.8mm) behind the rear wear plate to give the

required clearance.

3. Refit impeller in accordance with Section

5.3.1 Impeller and recheck clearance.

Front Clearance

1. Remove the front cover plate in accordance

with Section 5.3.1 Impeller, instructions 1 to 5

inclusively.

2. Remove shims.

3. Refit front cover plate.

4. Lightly tighten four equally spaced M12 nuts

on volute studs sufficiently to just nip onto the

impeller.

5. Use a feeler gauge to measure the clearance

between the front cover plate and the volute.

6. Calculate the shims required to give a

clearance of 0.2mm to 0.3mm.

7. Fit shims, (1309185000=0.25mm) or

(1309186000 = 0.15mm) as required.

8. Refit suction tube in accordance with Section

5.3.1 Impeller, instructions 18 to 21

inclusively.

2. 5.3.3 Mechanical Seal.

3. Remove the air hose from the separator cap, after

loosening the hose clips.

4. Remove nuts and washers, and lift off separator

cap complete with peel valve/upper diffuser

assembly.

5. Lift the separator body complete with lower

diffuser off the suction tube.

6. Remove the suction tube from the front cover

plate by removing 8 x M16 nuts and washers.

5. Remove the 12 x M12 nuts and washers holding

the front cover plate to the volute. Then jack the

front cover plate away evenly from the volute

using two M12 bolts in the two tapped holes in the

front cover plate. The cast eye in the top of the

cover is there to provide a shackle point to lift the

front cover Assembly only, (component weight

100Kg). Remove the jacking screws from front

cover plate.

6. Take care not to damage the shims, or wear plate.

7. Release the M16 capscrew, (R.H. thread) in the

centre of the impeller.

8. NOTE: Take care when disengaging the impeller

capscrew as the compressed mechanical seal

spring will push the impeller off the shaft.

9. Remove the impeller complete with M16

capscrew, impeller collar, Dowty seal, 'O' ring and

the rotational part of the mechanical seal. It is

advisable to make a tool locally to support the

impeller weight 25Kg during this operation.

10. Check the mechanical seal and replace if

necessary. (See Section 0).

11. Before replacing the new impeller. Fit a new key if

necessary between shaft and new impeller.

12. Oil the new impeller bore.

13. Fit M16 capscrew with a new greased Dowty

washer. Apply Loctite Nutlock 242 to the thread.

14. Compress mechanical seal spring and tighten

M16 capscrew to 90 lb-ft (122 Nm) torque. It is

essential that this screw is correctly tensioned.

During this operation, it may be necessary to lock

the impeller by means of a wooden block wedged

between the impeller blades and volute casing.

Remove block after use. Or alternatively stop

rotation on the drive end of the shaft.

15. Check the impeller back clearance is 0.4mm to

0.5mm. This can only be done with the volute

removed from the rear cover plate. For adjustment

see Section 0 5.3.2 Setting Impeller Clearances

instructions 4 to 5 inclusively.

16. Replace the rear cover plate and bearing housing

into the volute.

17. Check the impeller front clearance is 0.2mm to

0.3mm. For adjustment see Section 0 5.3.2

Setting Impeller Clearances instructions 9 to 16

inclusively.

18. Replace the suction tube on the front cover plate.

19. Reposition separator body sub-assembly on

suction tube, and fit separator cap assembly.

Assemble washers and nuts and alternatively

tighten each nut a small amount to ensure that the

cap is pulled down evenly. Do NOT over-tighten.

Selwood H100 Manual

20. Replace the air hose on the spigot of the

separator cap and tighten the hose clips.

21. Refill the oil reservoir with oil to dipstick level.

5.3.2 Setting Impeller Clearances

General

Clearance at the rear of the impeller must be

maintained at 0.4mm to 0.5mm. Clearance at the front

of the impeller must be maintained at 0.2mm to

0.3mm. Increasing the clearance will result in loss of

hydraulic efficiency and reduced bearing life. Both

front and back clearances are established by shims

respectively.

Back Clearance

This should be checked using feeler gauges. This is

only possible by removing the volute from the rear

cover and bearing housing. This is done by removing

12 x M12 nuts and washers holding the volute and rear

cover plate together and then separating the two

component parts. Leave the rear cover plate attached

to the bearing housing. If adjustment is required:

4. Remove impeller in accordance with Section

5.3.1 Impeller, instructions 1 to 9 inclusively.

5. Add or remove shims (1310366000 = 0.1mm,

1310365000 = 0.25mm or 1310242000 =

0.8mm) behind the rear wear plate to give the

required clearance.

6. Refit impeller in accordance with Section

5.3.1 Impeller and recheck clearance.

Front Clearance

9. Remove the front cover plate in accordance

with Section 5.3.1 Impeller, instructions 1 to 5

inclusively.

10. Remove shims.

11. Refit front cover plate.

12. Lightly tighten four equally spaced M12 nuts

on volute studs sufficiently to just nip onto the

impeller.

13. Use a feeler gauge to measure the clearance

between the front cover plate and the volute.

14. Calculate the shims required to give a

clearance of 0.2mm to 0.3mm.

15. Fit shims, (1309185000=0.25mm) or

(1309186000 = 0.15mm) as required.

16. Refit suction tube in accordance with Section

5.3.1 Impeller, instructions 18 to 21

inclusively.

5.3.3 Mechanical Seal

The mechanical seal should be replaced if the flushing

chamber oil continuously leaks into the pumped fluid,

or if the oil becomes contaminated with the product.

This latter condition is sometimes indicated by leakage

of fluid out of the breather cap. Under extreme

conditions, pumped fluid may be seen escaping out of

the vent at the bottom of bearing housing.

In the event of abrasive materials being detected in the

oil, it is likely that lip seal will have become worn and

necessitates replacement in accordance with Section 0

5.4.1 Lip Seals.

Daily checks on oil condition should ensure that seal

failure is detected before damage occurs to related

components. If the mechanical seal leaks, proceed as

follows:

1. Remove impeller in accordance with Section 0

5.3.1 Impeller, Instructions 1 to 9 inclusively.

2. Remove the mechanical seal rotating element by

pulling it from the impeller.

3. Remove impeller spacer shims from the shaft.

4. Using seat removal tool (Part No. 0015166000),

withdraw mechanical seal stationary seat and

rubber ring from recess in the rear cover plate.

•The mechanical seal should now be discarded.

IMPORTANT ADVICE

New mechanical seal components must

be handled with great care; in

particular, the seal faces must not be

touched by hand and must only come

into contact with clean soft paper that is

free from abrasive materials.

Premature seal failure is likely to occur

if this advice is not heeded.

If replacing the lip seals proceed in accordance with

Section 0 5.4.1 Lip Seals instructions 9 to 18

inclusively. If not, replace the bearing housing

assembly, taking care not to damage the shaft on the

mechanical seal housing.

Important Pre-Installation Checks

1. Condition of main lip seals and shaft surfaces

must be good. See 0.

2. Seal flushing chamber must be clean, free from

grit and silt deposits, otherwise oil properties will

be impaired.

3. Shaft bearings must be in good condition and

have no more than 0.06mm axial movement.

Check with dial indicator. If excessive, reset or

replace bearings. See Section 0 for resetting

procedure. Clearance new is 0.04-0.06mm

(0.0016” – 0.0023”).

4. Size and condition of stationary seal recess in rear

cover plate must be checked. Maximum

permissible diameter is 92.075 (3.625”). If

oversize a new rear cover plate should be fitted.

5. Wear plates, if excessively worn, should be

replaced to regain a running clearance of 0.2mm

to 0.3mm for the front wear plate and 0.4mm to

0.5mm for the rear wear plate. See Section 0 and

0. For resetting See Section 0

Selwood H100 Manual

6. An old corroded impeller cannot be used unless

the size and surface finish of the rear drive boss is

as new.

7. Ensure all pre-installation checks have been

made. Inspect the lead chamfer on the rear cover

plate stationary face recess; this should be

smooth, clean and corrosion free.

8. Check the new or cleaned up impeller for a tight

but sliding fit on the shaft and key. Replace if

necessary.

9. Check the impeller back clearance and adjust if

necessary. See Section 0.

10. Lubricate the stationary seal recess and lead with

a much diluted solution of soft soap. Lubricate the

outside face assembly with clean water only and

using tool (1596131000) push the seal face firmly

to the base of the recess. The use of the tool will

ensure that the face is fitted square to the shaft

axis. Check face is clean when tool is removed.

11. Lubricate impeller key with oil and fit to shaft.

12. Lay the impeller blade side down on a firm

surface. Lightly oil the bore and keyway.

13. With clean hands, apply soap to the outside of the

impeller boss and lead. Apply soft soap inside the

rubber part of the mechanical seal and the

impeller boss. Then with a twisting action applied

to the rear of the spring and carrier ring, screw the

bellows onto the impeller boss. Ensure the bellows

is fully located against the back of the impeller.

DO NOT PUSH ON THE FACE OF THE

MECHANICAL SEALING SURFACE.

14. Check that no dirt or contamination has got onto

the seal surface. Apply a couple of drops of clean

oil to the face and spread to a thin film with a

clean finger.

15. The impeller/seal assembly can now be mounted

on the shaft taking great care not to contact the

seal face on the shaft or key whilst locating the

shaft in the bore. Keep pushing the impeller until

the seal faces contact. Refit impeller retaining

screw and reassemble pump in accordance with

Section 0 5.3.1 Impeller, instructions 12 to 21

inclusively.

5.3.4 Front Wear Plate

Failure of the pump set to generate sufficient head

could be due to a worn wear plate or incorrect

clearance between impeller and front wear plate.

1. Remove suction tube, separator assembly and

front cover plate in accordance with Section 0

5.3.1 Impeller instructions 1 to 5 inclusively.

2. The front wear ring is bonded into the front cover

plate using Loctite retainer. It can be removed by

heating the ring gently to break the Loctite down.

Run three welds equally spaced around the inside

of the ring. When the welds have cooled and

contracted the ring should be able to be removed.

3. Clean up the recess in the front cover plate.

4. Apply Loctite 603 to the outside of the wear plate

and push the wear plate fully into the recess of the

front cover plate.

5. Check impeller front clearance and adjust if

necessary in accordance with Section 0 5.3.2

Setting Impeller Clearances instructions 11 to 12

inclusively.

6. Refit suction tube and separator assembly in

accordance with Section 0 5.3.1 Impeller

instructions 18 to 22 inclusively.

5.3.5 Rear Wear Plate

Failure of the pump set to generate sufficient head

could be due to a worn wear plate or incorrect

clearance between impeller and rear wear plate. If re

shimming does not bring the clearance back into limit

replacement will be necessary.

1. Remove suction tube, separator assembly, front

cover plate and impeller in accordance with

Section 0 5.3.1 Impeller instructions 2 to 9

inclusively.

2. Remove eight M6 slotted cheese head screws and

washers securing Rear wear plate to rear cover

plate.

3. Carefully lever the rear wear plate away from the

rear cover plate. Clean rear wear plate interface.

4. Check condition of rear wear plate for excessive

wear or damage and replace if necessary.

5. Lightly grease rear wear plate interface.

6. Examine M6 slotted cheese head screws and

replace if damaged.

7. Offer the rear wear plate to rear cover plate and

carefully align screw holes. Fit washers and M6

slotted cheese head screws with Loctite Nutlock

242 applied to threads.

8. Check impeller back clearance and adjust if

necessary in accordance with Section 0 5.3.2

Setting Impeller Clearances instructions.

9. Refit suction tube, separator assembly, front cover

plate and impeller in accordance with Section 0

5.3.1 Impeller instructions.

5.3.6 Delivery Valve

Failure of the pump set to pump under suction lift

conditions could be due to a fault in the delivery valve

assembly.

To inspect and service, proceed as follows:

1. Ensure that pump has been shut down and the

delivery line has been drained.

2. Release four nuts, remove the inspection cover. It

now becomes possible to lift valve flap by hand to

expose the valve seat so allowing foreign matter

to be removed. Also undertake a preliminary

check of the condition of the valve plate.

3. If further disassembly of the valve is required to

replace valve seat, Valve plate and Valve pivot pin

and bushes proceed with following instructions, If

not refit cover.

Valve Plate

Selwood H100 Manual

Valve plate may be damaged or worn preventing

sealing with valve seat. Replacement instructions as

follows:-

1. Unscrew M12 self-locking nut and sealing washer

holding flap valve assembly together.

2. Carefully remove retaining plate complete with bolt

and sealing washer.

3. Lever valve insert away from Valve plate. Examine

condition of Valve seating surface. Discard if

damaged or misshapen.

4. Clean Valve hinge plate and retaining plate of

loose debris and reassemble flap valve with new

valve rubber, new M12 self-locking nut and if

required new sealing washer.

5. Check Valve is sealing fully and refit inspection

cover

Valve Seat.

Valve seat may be damaged or worn preventing

sealing with valve rubber. Replacement instructions as

follows:

1. Remove eight M16 nuts and washers from studs

securing valve to volute. Carefully lift Delivery

valve body complete with flap valve parts off

volute.

2. Remove protective plug on base flange of valve

body and unscrew M8 socket setscrew holding

valve seat in place.

3. Remove valve seat from valve body. Discard ‘O’

ring fitted to valve seat. Examine condition of

valve seat for excessive wear or corrosion. Clean

part and refit. Replace if necessary.

4. Before refitting valve seat, clean and grease ‘O’

ring groove and fit new ‘O’ ring.

5. Push valve seat into valve body until registered on

abutment. Smear Loctite 242 on threads of M8

socket setscrew and insert into valve body to lock

valve seat. Fit protective plug.

6. Before refitting valve onto volute check condition

of gasket and replace if necessary. Position valve

onto volute flange and fit M16 nuts and washers.

Carefully tighten nuts in small increments to

produce even clamping on gasket.

7. Check valve is sealing fully and refit inspection

cover.

Valve Pivot Pin and Pivot Bushes

Valve pivot pin and bushes may be damaged or worn

preventing valve rubber sealing with valve seat.

Replacement instructions as follows:

1. Remove eight M16 nuts and washers from studs

securing valve to volute. Carefully lift Delivery

valve body complete with flap valve parts off

volute.

2. To enable access to pivot pin remove the two

circular pivot caps with gaskets situated each side

of delivery valve held in by screws and washers.

Discard pivot cap gaskets after removal.

3. Unscrew three socket setscrews locking the valve

flap to pivot pin.

4. Push pivot pin completely out of valve body and

remove. Push pivot pin bushes and spacers out

of body.

5. Clean removed parts and check condition of pivot

pin and pivot pin bushes and spacers for

corrosion, damage or excessive wear and replace

with new parts if necessary.

6. Clean the pivot bush housings in valve body and

push in pivot bushes until registered on internal

abutments.

7. Push clean pivot pin through fitted pivot bushes,

spacers and valve flap. Centralise valve flap on to

valve seat and centre pivot pin within valve flap.

Smear M8 socket setscrews threads with Loctite

242 and Lock valve flap in place.

8. Renew pivot cap gaskets and replace pivot caps.

Fit in place with screws and washers.

9. Before refitting valve onto volute check condition

of gasket and replace if necessary. Position valve

onto volute flange and fit M16 nuts and washers.

Carefully tighten nuts in small increments to

produce even clamping on gasket.

10. Check valve is sealing fully and refit inspection

cover.

5.4 Maintenance of Lip seals,

Headland V Seal, Bearings and

Main shaft.

5.4.1 Lip Seals

For service and inspection proceed as follows:

1. Remove impeller and mechanical seal in

accordance with Section 0 5.3.1 Impeller

instructions 1 to 9.

2. Remove coupling guards and flexible element

from coupling.

3. Disconnect air pump exhaust hose from air pump.

Make sure Oil Reservoir is fully drained then

disconnect Oil Reservoir Hoses and Breather

Hose from bearing housing. Remove three bolts

that hold the pump to the chassis from mounting

pedestal and loosen fourth on delivery side of

pump.

4. Swing mounting pedestal and attached assembly

anti-clockwise until both sides of coupling are

clear of each other.

5. Support bearing housing and air pump assemblies

in a sling (assembly weight = 78kg).

6. Remove the air pump.

7. Remove twelve M12 nuts and spring washers,

from the studs securing the bearing housing

flange to the rear cover plate.

NOTE: Move axially for at least 100mm for shaft to

clear mechanical seal housing.

8. Stand assembly on a clean flat surface, with the

shaft vertical on the coupling flange.

9. Remove six M6 hexagon head screws and spring

washers from the bearing front cover.

Selwood H100 Manual

10. Using the tapped holes in the bearing front end

cover flange jack it away from the bearing

housing.

11. Remove bearing front end cover complete with lip

seals and remove jack screws.

12. Remove and discard gasket.

13. Inspect shaft sealing surface for damage. If

necessary remove the shaft in accordance with

Section 0 5.4.3 Bearings.

14. Remove lip seals and clean seal housings.

15. Oil new seals and push into housings, both seals

must have lips facing towards the impeller.

16. Remove excess grease from in front of the

bearing to just expose the rollers. This will avoid

the likelihood of future over packing.

17. Ensure breather is clear.

18. Fit new gasket ensuring that the vent hole in the

bottom of the seal oil chamber is not covered.

19. Grease shaft on the sealing surface and fit bearing

front end cover complete with lip seals.

NOTE: The plug must go to the bottom of the chamber

in the recess.

20. Fit six M6 screws and spring washers, and torque

to 7 to 8 Ib/ft. (9.5 to 10.8 Nm).

21. Fit new 'O' ring to bearing housing spigot and

smear with grease or oil.

22. Replace bearing housing assembly taking care not

to damage the shaft on the mechanical seal,

housing.

23. Fit twelve M12 nuts and spring washers, and

torque to 60 Ib/ft. (81 Nm).

24. Swing the mounting pedestal and attached

assembly back into position and insert chassis

bolts, spring washers and nuts.

25. Torque chassis bolts to 150 Ib/ft. (203 Nm).

26. Reinstall flexible element of drive coupling.

27. Refit coupling and belt guards. Reconnect air

pump exhaust hose. Reconnect Oil Reservoir

hoses and Breather hose to bearing housing.

28. Refit impeller and mechanical seal in accordance

with Section 0 5.3.1 Impeller instructions.

NOTE: If lifting gear is not available the air pump may

be separated from the bearing housing reducing the

lifted weights to:

29. Air Pump Assembly = 40Kg

30. Bearing Housing Assembly = 38.5kg.

31. For air pump assembly removal and installation

see Section 0.

5.4.2 Headland V Seal

For service and inspection proceed as follows:-

1. Remove coupling guards and flexible element

from coupling.

2. Disconnect air pump exhaust hose from air pump.

Remove three bolts hold pump to chassis from

mounting pedestal and loosen fourth on delivery

side of pump.

3. Swing mounting pedestal and attached assembly

anti-clockwise until both sides of coupling are

clear of each other.

4. Remove pump end of drive coupling from pump

shaft noting position of centre hub or taper lock in

relation to drive shaft end or air pump drive pump

pulley.

5. Remove air pump drive belt in accordance with

Section 5.1.11 Drive Belt instructions 4 to 5

inclusively. Loosen screws in pump pulley taper

lock and disengage pump pulley and taper lock

followed by spacer from pump drive shaft.

6. Remove circlip from groove in drive shaft collar.

Gently prise out Headland V Seal from recess in

bearing drive end cover.

7. Examine seal for damage or excessive wear and

discard if necessary

8. Clean and lightly grease sealing area recess in

bearing drive end cover and outside diameter of

drive shaft collar lightly grease.

9. Press in new Headland V Seal and replace circlip

and spacer.

10. Refit taper lock and pump pulley ensuring that the

taper lock is pushed up against spacer and tighten

in place.

11. Refit air pump drive belt, pulley and taper lock in

accordance with Section 5.1.11 Drive Belt

instructions 6 to 9 inclusively.

12. Reassemble pump end of drive coupling and fit to

drive shaft to previously noted original position.

13. Reinstall flexible element of drive coupling,

reposition pump onto pump mounting holes and

secure in place with bolts, washers and nuts.

14. Refit coupling and belt guards and reconnect air

pump exhaust hose from air pump.

5.4.3 Bearings

For service and inspection proceed as follows:

1. Remove Bearing front end cover complete

with Lip seals in accordance with Section 0

5.4.1 Lip Seals Instructions 1 to 14

inclusively.

2. Remove headland V seal in accordance with

Section 0 5.4.2 Headland V Seal instructions

1 to 6 and air pump assembly from pump

pedestal in accordance with Section 0 5.1.13

Air Pump Assembly instructions 1 to 5

inclusively.

3. To enable access to internal bearings remove

bearing drive end cover by unscrewing six M6

screws and washers. Remove cover end

cover and discard gasket.

4. Remove drive shaft collar by unscrewing two

setscrews completely from it. Using a ‘C’ type

spanner remove drive shaft collar from drive

shaft.

Selwood H100 Manual

5. Mount the assembly on a press with the shaft

vertical and the impeller end downwards. A

minimum of 30mm clearance beneath the

shaft is required.

6. Remove plastic protection plug from shaft

end.

7. Protect shaft end and engage in the press to

remove drive end volute end bearings

consisting of a bearing cone and cup.

8. Press drive shaft through bearings, 26mm

movement will clear bearing cones from their

seats.

9. Hold shaft steady and carefully lift off bearing

housing complete with bearing cups.

NOTE: Take great care not to damage the shaft

particularly on the sealing surface (largest

diameter of drive shaft).

10. Press the remaining bearing cone off its seat,

over the next, and remove from shaft.

11. Remove the bearing cups from the bearing

housing using a two claw puller engaging in

the pockets cast into the housing behind the

cups.

12. Discard old bearings; thoroughly clean all

bearing housing surfaces. Inspect drive shaft

for damage, replace if necessary and clean all

drive shaft surfaces thoroughly, smear oil on

bearing mounting diameters

13. Press new bearing cups of bearings into

bearing housing ensuring that they are right

up against their abutments.

14. Pack the impeller end bearing cover about

1/3rd full with BP Energrease LS-EP2.

15. Press impeller end bearing cone onto the

shaft using a suitable tube that contacts the

inner race only. The taper roller bearings are

mounted back to back. The bearing must first

be pressed over the drive end bearing seat.

Ensure that it is pressed right up against the

shaft abutment.

16. Pack the rollers with approx 35g of BP

Energrease LS-EP2 or equivalent EP2

grease.

17. Hold the shaft vertical with the impeller end

downwards and carefully lower the bearing

housing over.

18. Pack the drive end bearing rollers 35g of BP

Energrease LS-EP2 or equivalent EP2 grease

19. Lower the drive end bearing cone over the

shaft and press about 20mm onto its seat.

20. Screw the shaft collar up to bearing.

21. Fit half coupling to shaft.

22. Fill hole in shaft end with SKF hydraulic oil

ref. LHMF3D1 and connect the hose from the

oil injection pump SKF 729123.

23. Clamp the bearing housing flange in a soft

jaw vice with the shaft horizontal and the

coupling nearest to you.

24. Set up a dial type indicator on the shaft

impeller end.

25. Measure the axial clearance in the bearings

by moving the shaft back and forth whilst

turning to bed in rollers.

26. Pump up the hydraulic oil pressure until the

bearing can be moved by tightening the shaft

collar with a 'C' spanner (SKF HN11).

27. SET BEARING AXIAL CLEARANCE TO

0.04-0.06mm (0.0016” – 0.0023”). by

repeating stages 25 and 26.

NOTE: One complete turn of the shaft collar

gives 2mm axial movement.

28. Do not carry out the bearing adjustment

procedure with lip seats fitted as they will

impede shaft movement and may cause

errors.

29. A special tool is available to facilitate bearing

adjustment Ref. WRS 987.

30. The correct bearing clearance must be

accurately set to ensure satisfactory

operation. Failure to do this will result in

overheating and consequently reduced

bearing life.

31. Use BP Energrease LS-EP2 or a suitable

EP2 equivalent.

32. Do not pack grease into outer covers, excess

causes overheating and premature bearing

failure.

33. Fit and tighten two setscrews to lock shaft

collar to shaft.

34. Remove the dial indicator.

35. Disconnect the hydraulic pump and drain

hydraulic oil from shaft. Discard oil and fit

plastic plug in shaft end to protect the tapped

hole.

36. Remove the half coupling.

37. Refit Lip seals, Mechanical Seal, Impeller and

remaining pump end parts in accordance with

Section 0 5.4.1 Lip Seals instructions 15 to 23

inclusively and Section 0 5.3.1 Impeller

instructions.

38. Refit Air pump assembly to pump pedestal in

accordance with Section 0 5.1.13 Air Pump

Assembly instructions 7 to 8 inclusively.

39. Refit Headland V Seal in accordance with

Section 0 5.4.2 Headland V Seal instructions

8 to 14 inclusively.

40. Reconnect Oil Reservoir Hoses and Breather

hose) from Oil Reservoir to Bearing housing

and Refill with reservoir with oil to dipstick

level.

5.4.4 Main Shaft

For service and inspection proceed as follows:

1. Remove main shaft in accordance with Section 0

5.4.3 Bearings instructions 1 to 12 inclusively.

2. Reuse existing bearings if condition is satisfactory.

Selwood H100 Manual

3. Fit new main shaft. During reassembly check front

and back impeller clearances in accordance with

Section 0 5.3.2 Setting Impeller Clearances.

4. Reassemble pump in accordance with Section 0

5.4.3 Bearings instructions 13 to 40 inclusively.

5.5 Chassis Maintenance

It is possible to work on individual components of the

chassis without removing either the engine or the

pump unit. In all cases work should be undertaken on

level ground and care should be exercised to ensure

that the pump set is fully immobilised. If the chassis is

to be completely dismantled, both the engine and

pump unit should be removed in compliance with the

requirements of Health and Safety at Work Act, 1975.

5.6 Super Silent - Canopy

Removal

To remove the canopy, proceed as follows:

1. Disconnect the battery positive and negative and

remove the battery assembly.

2. Disconnect exhaust pipework within canopy

having first removed insulation blanket.

3. Disconnect emergency stop wiring plugs from stop

buttons from within canopy. Tie up onto engine to

prevent damage to wiring.

4. Remove suction and discharge aperture cover

plates. Remove foam plugs and rubber blanking

gasket.

5. Remove discharge fitting and extension piece

from discharge flange of pump.

6. In each corner of the skid, working up through the

upper flange of the skid base are four M16

screws. Remove these in turn to release the

canopy from the corners of the skid base.

7. With the corners released undo fasteners from the

centre lifting frame. When these are released the

canopy is ready to be lifted clear.

8. Lift the canopy up and away from the unit; place

down on timber runners to protect the lower edge.

5.7 Super Silent - Fuel Tank

removal

To remove the fuel tank, proceed as follows:

1. With the canopy removed it will now be necessary

to remove the pump and engine from the tank

structure. Begin by removing the coupling guards

from the engine bell housing. Slacken coupling

flanges and remove rubber tyre.

2. Disconnect the air pump silencer hose from the

discharge elbow of the air pump. Remove the

clamps holding silencer body. Remove the air

pump silencer assembly complete.

3. Slacken and remove the four M16 fixings holding

the pump body. Attach a suitable lifting device to

the pump and lift the pump unit clear of the

chassis.

4. To remove the engine the following parts will need

to be removed from the tank/skid structure and

where necessary tied back to the engine to

prevent damage. Disconnect and drain fuel lines.

Undo and remove control panel from bracket.

Working beneath the engine end of the skid

slacken the bulkhead fitting lock nut on the oil

drain hose and remove the hose end from the skid

base. Tie the hose back to a suitable point on the

engine.

5. The last fixings to be removed are engine mount

to AV mount securing screws. Slacken and

remove each in turn.

6. The engine is now ready to be removed from the

tank structure. Lift vertically up and away. Watch

for any danger of collision between engine and

tank. The engine will need to be placed in a

suitable frame to prevent damage to the oil drain

or sump.

7. To remove the tank, slacken and remove four tank

to AV mount screws. With these removed use a

set of four chains to lift the tank unit from the skid

base using the four AV mount brackets.

5.8 Super silent – Fuel Tank

Refitting

To refit the fuel tank, proceed as follows:

1. Refit the tank as per removal taking note of the

fuel drain plug position and its relationship to the

access plug in the skid base. Orientate the tank

so that the drain is behind the larger plug.

2. Insert the four screws to secure the tank to the AV

mounts and check the alignment of the tank in the

skid base before tightening these screws. During

the tightening procedure a twisting moment can be

applied to the rubber element of the mount which

is undesirable. If this occurs, use or make a

suitable tool to counteract this twist and tighten to

150 Nm. Recheck alignment and ensure no

mounts are twisted. Correct if required.

3. Refit engine but do not fully tighten the mounting

to the AV mount screws at this stage, finger

tighten only. Reconnect all fuel lines, oil drain and

refit the control panel.

4. Lift the pump end onto the chassis and visually

align the coupling flanges. Using a steel rule or

suitable straight edge check the flanges are

parallel and level with each other. Shim under the

engine only to set units level.

5. The pump should now be visually aligned and

tighten down to 150 Nm torque.

6. Move the engine on its mountings to make

alignment adjustments. Any shimming to adjust

vertical height should be added under the engine.

7. When alignment is satisfactory gradually tighten

the mounting screws to 70 Nm, checking

element/hub movement on the shaft each time.

Selwood H100 Manual

8. When complete, refit the rubber tyre and check all

fasteners are tight.

5.9 Super silent – Canopy

Refitting

To refit the canopy, proceed as follows:

1. Re-sling the canopy as for removal and lift into

position. Take care not to damage the radiator

when positioning. Lower onto skid base checking

for alignment of the lifting fastener holes.

2. When down and before fitting any fixings check

that the radiator overflow pipe is not trapped by

the canopy bulkhead. Release if trapped.

3. Refit canopy lifting bolts and four corner fixing

screws. Adjust alignment if necessary and tighten

corner screws then lifting bolts.

4. Remove eye bolts from canopy roof and replace

with fasteners to prevent water ingress.

5. Refit the delivery extension and fittings and refit

the suction and discharge covers as the reverse of

removal.

6. Reconnect the exhaust extension and refit

insulating cover.

7. Refit the fuel lines and control panel.

8. Refit the air pump exhaust silencer assembly.

9. Reconnect the emergency stop wiring and refit the

battery assembly and coupling guards.

10. Fill with fuel and bleed the system as required.

Test run. Inspect all fasteners after 50 hours of

running.

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