SELWOOD D75 User manual

Selwood D75 Manual
1
SELWOOD D75
Operating & Service Manual
The products of Selwood Limited are designed,
developed and produced in the company's Chandlers
Ford factory.
World-wide patents cover many features. 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 7508025000
Published by © Selwood Limited
Selwood Limited December 2008
REPLACEMENT PARTS
Instructions for Ordering
1. Always quote the pump serial number located on
the plate fastened to the pump.
2. Always quote the ten digit part number for the
component, not the item reference number.
3. Always quote the description of the component.
Items usually supplied together as sub-assemblies, will
have the sub-assembly part number printed at the
bottom of the relevant page.
HEALTH & 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
certain of our products.
We take every care to ensure as far 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 & safety
requirements leaflet P769 which accompanies each
pump on despatch from our premises.
Q
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Our products also conform to the E.E.C. 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 D75 Manual
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SAFETY PRECAUTIONS
WARNING
ALL ITEMS IN THIS SECTION, IF NOT STRICTLY
OBSERVED, COULD RESULT IN SEVERE
PERSONAL INJURY OR LOSS OF LIFE.
4. 1. Use only lifting equipment of suitable capacity
for the size and weight of the equipment being
lifted
5.
6. 2. The equipment must always be lifted using
safe working practices and in accordance with any
local and national guidelines or statutes. If in
doubt, consult Selwood Pumps or a local lifting
expert.
7. 3. Whilst lifting the unit keep personnel well
away and never allow people underneath.
8. 4. 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.
9. 5. 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.
10. 6. Rotating equipment presents a hazard in
itself. Alert surrounding personnel before starting
and post notifications whilst in operation.
11. 7. Moving parts are guarded to protect you.
Guards removed for maintenance must be
replaced before starting the pump.
12. 8. Never insert anything into the pump body
whilst the pump is running and the suction or
delivery hoses are disconnected.
13. 9. Use all flange bolt holes and ensure the
correct bolt size and quality is utilised when
connecting suction and delivery hoses.
14. 10. Collapsible hoses must never be used on the
suction side of the pump.
15. 11. 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.
16. 12. 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.
17. 13. Be aware of burn and fire risks from items
such as exhaust pipes and silencers. Never place
flammable items around the unit.
18. 14. 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 6Bar
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 1.1 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
taps provided.
2. WARNING! Never start or run the pump
against a closed delivery 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 when
the unit is running. Failure to comply may result in
hearing damage or loss.

Selwood D75 Manual
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SELWOOD D75
CONTENTS
Title Page
Safety Precautions....................................................... 2
1GENERAL INFORMATION................................ 4
Installation...................................................................... 4
Operation ....................................................................... 4
Maintenance .................................................................. 4
I.C. Engines ................................................................... 4
Electric Motors ............................................................... 4
1.1 Selwood D75 standard Data............................... 5
2ROUTINE MAINTENANCE ................................ 5
3LUBRICATION AND FASTENING TORQUES.. 6
Pump Lubrication ........................................................... 6
Engine Sump ................................................................. 6
3.1.1 Commissioning Period............................. 6
3.1.2 After Commissioning Period .................... 6
3.2 Fastening Torques.............................................. 6
4CONDITIONS OF WARRANTY ......................... 6
5GENERAL MAINTENANCE............................... 7
5.1 Main Pump Assembly ......................................... 7
5.1.1 Volute Removal and Refitting .................. 7
5.1.2 Impeller Removal and Refitting ............... 7
5.1.3 Impeller Clearance .................................. 7
5.1.4 Mechanical Seal ...................................... 7
5.1.5 Front Wear Plate ..................................... 8
5.1.6 Lip Seals - Impeller End .......................... 8
5.1.7 Lip Seal - Coupling End........................... 8
5.1.8 Bearings .................................................. 9
5.2 Separator Assembly ......................................... 10
5.2.1 Float ...................................................... 10
5.2.2 Peel Valve ............................................. 10
5.2.3 Lower Diffuser ....................................... 10
5.3 Delivery Valve Assembly .................................. 10
5.3.1 Delivery Valve ....................................... 10
5.4 Air Pump Assembly .......................................... 10
5.4.1 Air Pump Suction Valve......................... 10
5.4.2 Actuator Suction Valve .......................... 11
5.4.3 Actuator Seal......................................... 11
5.4.4 Air Pump Discharge Valve..................... 11
5.4.5 Actuator Neck Seal................................ 11
5.4.6 Air Pump Drive Rod and Seals.............. 11
6FAULT FINDING GUIDE.................................. 13
7PART LIST ....................................................... 15
7.1 Volute and Separator........................................ 15
7.2 Pump End and Delivery Valve .......................... 17
7.3 Bearing and Air Pump Mechanism Housing ..... 19
7.4 Air Pump........................................................... 21
7.5 D75 / Hatz 1D41Z Hand Start on Site Chassis
Build No 7598287000 ....................................... 23
7.6 D75 / Hatz 1D41Z Electric Start on Site Chassis
Build No 7599137000 ....................................... 25
7.7 D75 / Hatz 1D41Z Electric Start –Superior
Chassis Build No 7502049000 ......................... 27
7.8 D75 / 2.2kW Electric 1450rpm 230v/ 1Ph/ 50Hz
- Build No 7503187000 ..................................... 31
7.9 D75 / 3kW Electric 1450rpm 400v/ 3Ph/ 50Hz -
Build No 7502434000........................................33
7.10 D75 / 3kW Geared E-motor 2000rpm 400v/
3Ph/ 50Hz Build No 7504025000 ......................35
7.11 D75 / Yanmar 2TNE68 On Skid Chassis Build
No 7508260C00 ................................................37
7.12 D75/Yanmar 2TNE68 Supersilent on Fast Tow
2 Wheel Chassis ...............................................41
7.13 D75/Lombardini 15LD440 Electric Start On 2
Wheel Chassis ..................................................43

Selwood D75 Manual
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1 GENERAL INFORMATION
Installation
1. The pump unit and its associated baseplate or
trolley mounting should be positioned on a firm
horizontal platform, and in the case of portable
units restrained from accidental movement.
2. 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 maximum 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.
3. Delivery hose and any associated pipework
should be capable of withstanding the maximum
system operating pressure. Suction hose should
be of non-collapsible variety. Where used with
rigid pipework at least 2M of flexible pipe should
be used on both suction and delivery connections.
4. Trailer mounted units; Set trailer on firm level
ground and chock wheels. Ensure that rigid hose
is used on the suction, and that the discharge
hose has a minimum working pressure of 75psi.
Ensure that hoses are correctly coupled and that
the suction strainer is fully submerged. If a water
trap is fitted in the fuel line, it should be inspected
periodically and drained if necessary.
5. Fixed Installation; Chassis to be set on anti-
vibration mounts. NOTE: With electric drives
chassis must be earthed. Join rigid pipework with
flexible couplings. Avoid short radius pipe bends
close to pump suction.
Operation
1. CAUTION The pump should only be
operated within the speed and pressure limits
detailed in the operating handbook for the model
in question. Do not exceed specified speed of
2000rpm.
2. Ensure that correct suction strainer is fitted.
Max. solids capacity 29mm
3" Hose spigot strainer 0008155000
3" Male Bauer strainer 0008156000
4" Hose spigot strainer 1092033000
4" Male Bauer strainer 1092034000
3. Before starting, ensure all drain valves are closed
and that delivery valve cover is secure.
4. 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.
5. WARNING Centrifugal pumps of the D75
type should not be run against a closed valve on
the delivery side.
Maintenance
1. Inspection and maintenance procedures are
detailed in the operating and servicing manual for
the model in question.
2. 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.
3. All maintenance work must be carried out with the
pump and engine/motor stationary.
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 overstressed. Engines should not be
run in hazardous explosive atmospheres. When
pumping fluids emitting noxious gases, the air
pump must be exhausted to atmosphere outside
of the pump house.
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 starling,
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. WARNING 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 it is to be carried.
Electric Motors
1. All electrical connections should be made with
adequately rated conductors and starters.

Selwood D75 Manual
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Isolators and other associated switchgear
should be of adequate capacity for the
imposed power loadings. All electrical
equipment should be adequately earthed. All
connections to be made by a qualified
electrician to BS7671 latest revision.
2. WARNING Isolate the power supply
before carrying out any commissioning,
servicing or maintenance work on the pump
or electric motor.
3. 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, inspection, and service associated with our
products.
1.1 Selwood D75 standard Data
Maximum Speed 2000rpm
Maximum total generated head 23m
Maximum flowrate 62.5m³/hr
Maximum pumped solids size 29mm sphere
Self priming lift 8.8m of water
Air pump capacity 4.25I/s free air
Inlet port 2.1/2"BSP female
and 4" hosetail
Outlet port 21/2"BSP female
and 4" hosetail
Overall dimensions and weight of the complete
pumpset will vary depending on specification ordered.
Please refer to the Pump Division of Selwood Limited
for detailed information.
2 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.
1. Check these oil levels daily:
a) Engine oil.
b) Bearing housing oil
c) Flushing chamber oil.
2. Flushing chamber oil In cold weather, when there
is a possibility of frost, always drain water from the
pump particularly where the pump may experience
long periods of inactivity. During these conditions,
drain the following areas:
a) Pump body.
b) Delivery manifold and pipework.
CAUTION
a) Failure to drain the pump body and
delivery line in these conditions could result in the
pumped product residue freezing and cracking the
casing and manifold.
3. Do NOT run the pump if significant quantities of
water escape through the air pump. This pump is
designed to tolerate moisture-laden air, but not to
pump a high percentage of water. This indicates
failure of the inner neck seal and must be repaired
before running can continue. Refer to servicing
instructions for further advice.
4. Do NOT run the pump if malfunction is suspected
in any of its parts.
5. 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 16mm Refer to Selwood Ltd if in need of
advice in this connection.
6. As loss of prime and indeed loss of on-stream
performance can easily arise as the result of
leaking pipework joints, we recommend that all
line fittings associated with the pump should be
checked periodically for air-tightness.
7. 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
Incorrect or contaminated fuel.
8. Periodically check the tension of all nuts and bolts,
especially those securing the engine and pump to
the chassis.
9. 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.
10. 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.
11. 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.
12. 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.

Selwood D75 Manual
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The pump should give a long and trouble free life if
these measures are put into effect.
3 LUBRICATION AND
FASTENING TORQUES
Pump Lubrication
It is most important to maintain the correct levels of oil
in the seal 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 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 SHELL
GRADE
BP Grade
Engine
Hatz 1D41z
Lombardini 15LD440
Rimula X
15W-40
Vanellus
C5 global
Pump Bearing housing Rimula X
15W-40
Vanellus
C5 global
Flushing chamber Rimula X
15W-40
Vanellus
C5 global
Axle stubs Alvania EP
LF 2 or RA
Energrease
LS EP2
Actuator Bore ENSIS
SDB
Castrol
Rustilo 431
DRAIN INTERVAL
COMPARTMENT
HOURS MONTHS
Engine Sump 250
Bearing housing 250
Axle stub ON ASSEMBLY 6
Actuator Bore ON ASSEMBLY -
Paper Gaskets ON ASSEMBLY -
3.1.1 Commissioning Period
Drain the pump chamber and engine within 100
running hours of commissioning either a new, or rebuilt
units, and refill with new oil to correct level.
3.1.2 After Commissioning Period
If the pump is driven by a diesel engine, the oil in the
seal chamber should be drained and renewed
simultaneously with the time schedule laid down by the
engine manufacturer. This will usually require the oil to
be drained and replaced every 250 running hours.
Under no circumstances should the period exceed 500
running hours.
3.2 Fastening Torques
Failure to tighten threaded fasteners correctly can
easily lead to assembly breakdowns. It is important
therefore, when carrying out the instructions in this
manual, to achieve the appropriate torque figures. In
some cases, specific requirements are described in the
instructions, which must always be implemented. The
following torques, in particular, must be applied.
The most significant torque values are:
Tightening
Torques
Item
lbft Nm
M16 Fixings 180 244
M12 Fixings 72.3 98
M10 Fixings 41.3 56
M8 Fixings 20.7 28
M6 Fixings 8.6 11.7
Actuator Cap Screw M10 (D24) 41.3 56
Air pump pedestal capscrew M8
(D29) 20.7 28
Impeller Screw M10 (B27) 41.3 56
4 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, whichever 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 D75 Manual
7
5 GENERAL MAINTENANCE
NOTES:
1. Electric Start, Engine Driven Pumps: Disconnect
the negative battery connection before starting
work.
2. Electric Motor Driven Pumps: Ensure that the
motor is isolated before starting work.
5.1 Main Pump Assembly
5.1.1 Volute Removal and Refitting
Removal
1. Drain oil from mechanical seal chamber by
removing plug (C27).
2. Remove separator air hose (D30).
3. Position a suitable support under the bearing
housing (C04), at a point close to its connection
with the mechanical seal housing (B14).
4. Remove nuts (B31) and spring washers (B32),
and slide the volute casing (A14) forward until the
studs are dear of the mechanical seal housing,
taking care not to damage the shims and 'O' rings.
Note, the mechanical seal housing is not
removable at this stage.
5. Retain spacers (B33) and support foot (B15).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Inspect all shims, 'O' rings and gaskets, and
replace as necessary.
2. Care should be taken when fitting volute casing, to
ensure that 'O' ring is not pinched or rolled out of
its groove.
3. Ensure that mounting foot spacers (B33) are
correctly positioned.
5.1.2 Impeller Removal and Refitting
Removal
1. Remove volute as Section 7.1.1
2. Release the capscrew (B27), taking care as the
mechanical seal spring may push the impeller
(B12) off the shaft.
3. Remove the impeller complete with its capscrew,
seal washer (B28), and rotating half of the
mechanical seal (B13). The impeller/shaft key
(C25) may also come away with the impeller.
4. The centre boss is bonded into the impeller and
should not be removed.
Refitting
1. Inspect all components and replace if necessary.
It is recommended that a new mechanical seal be
fitted whenever the faces have been parted. See
Section 7.1.4.
2. Lightly oil impeller bore.
3. Slide impeller onto shaft, taking care not to
damage or contaminate face of mechanical seal.
4. Fit a new sealing washer (B28), and refit impeller
capscrew using 'Loctite' 242. Tighten to a torque
of 22 lbf-ft. (3 Kgf-m)
5. Refit volute and check clearance between impeller
and front wear plate. This clearance should be
0.5mm, and can be adjusted by altering the shim
pack (B36, B37, B38) between the volute and
mechanical seal housing.
6. Access can be gained by removing separator as
Section 7.2.
5.1.3 Impeller Clearance
Clearance at the front of the impeller must be
maintained at a maximum of 0.5mm. Increasing this
clearance will result in a loss of hydraulic efficiency
and reduced bearing life.
5.1.4 Mechanical Seal
IMPORTANT NOTE: It is essential that absolute
cleanliness be maintained throughout any procedure
involving a mechanical seal. Any debris, however
small, remaining on the seal face will cause premature
failure of the seal.
Removal
1. Remove volute as Section 7.1.1.
2. Remove impeller as Section 7.1.2.
3. Using service tool 0015166000, remove stationary
seat of mechanical seal (B13) from its housing
(B14).
Refitting
1. It is recommended that a new mechanical seal be
fitted whenever the seal faces have been parted.
2. Thoroughly dean the impeller, shaft and housing
recess.
3. Carefully unpack the new mechanical seal,
ensuring that the faces are not damaged or
contaminated.
4. Lubricate outside of stationary face joint ring and
inside of housing bore with soft soap. (Do not oil
or grease).
5. Carefully push seal into housing with face
protected, ensuring that seal is fully home and
square.
6. Lubricate outside diameter of impeller spigot and
inner bore of seal rubber with soft soap (Do not oil
or grease).
7. Push back rotating half of seal onto impeller spigot
using a twisting action. Ensure rubber is fully
home against rear face of impeller.
8. Lightly oil impeller bore.
9. Slide impeller onto shaft, taking extreme care not
to damage or contaminate seal face.
10. Fit a new sealing washer (B28) and refit impeller
capscrew (B27) using 'Loctite' 242. Tighten to a
torque of 22 lbf-ft (3 Kgf-m).

Selwood D75 Manual
8
11. Refit volute and separator assemblies.
5.1.5 Front Wear Plate
Removal
1. Remove volute as Section 7.1.1.
2. Remove retaining screws (B24) and washers
(B29).
3. Remove wear plate (B11). If necessary, access
can be gained via suction tube to use a suitable
drift to aid removal.
Refitting
1. Thoroughly clean wear plate and volute.
2. Lightly grease volute/wear plate interface.
3. Offer up wear plate to volute and align screw
holes.
4. Examine retaining screws (B24) and replace as
necessary.
5. Refit retaining screws and washers, using 'Loctite'
242.
6. Refit volute as Section 7.1.1.
5.1.6 Lip Seals - Impeller End
Removal
1. Remove volute as Section 7.1.1.
2. Remove impeller as Section 7.1.2.
3. Remove mechanical seal housing (B14).
4. Remove four capscrews (C32) and spring
washers (C30), and withdraw bearing retainer
(C07) complete with lip seals. Note, a dowel
locates retainer.
5. Remove 'O' rings (C11 and C14) from bearing
retainer (C11), and dowel pin (C13).
6. Shaft sleeve (C10) may come away with bearing
retainer.
7. Inspect shaft sleeve sealing surface for damage,
and replace if necessary.
8. Remove lip seals (C09 and C08), noting their
positions and orientation.
9. Clean lip seal seating area thoroughly.
Refitting
1. Oil new seals and push into housing, ensuring
correct orientation.
2. If removed, lightly smear surface of shaft sleeve
(C10) with grease, and replace taking care not to
pinch or dislodge 'O' ring (C21).
3. Lightly grease between lips of seal (C08) with
Shell Alvania RA.
4. Fit new 'O' ring (C14) over dowel pin (C13) and
smear with oil or grease.
5. Fit new 'O' ring (C11) to bearing retainer (C07)
and smear with oil or grease.
6. Carefully replace bearing retainer, over shaft
sleeve, ensuring that dowel enters locating hole in
rear of retainer.
7. Refit capscrews and spring washers, and tighten
to a torque of 8 Ibf-ft. (1 Kgf-m).
8. Refit mechanical seal housing (B14), with 'O' ring
(B17).
9. Refit mechanical seal as Section 7.1.4.
10. Refit impeller as Section 7.1.2.
11. Refit volute as Section 7.1.1.
5.1.7 Lip Seal - Coupling End
NOTE: This procedure assumes that suitable lifting
gear is available. In the absence of lifting gear,
remove volute as Section 7.1.1. Prior to removing
pump from chassis, ensure stability of chassis by
supporting as necessary.
Removal
1. Provided the faces of the mechanical seal are not
allowed to part, flushing chamber oil does not
require draining. Otherwise, drain oil from both
chambers by removing drain plugs (C27).
2. Support pump, and remove capscrews joining
pump to engine.
3. Remove fasteners from support foot (B15) to
baseplate.
4. Slide pump away from engine to disengage
coupling, then lift away to a suitable working area.
5. Ensure pump is suitably supported before carrying
out further work.
6. Remove coupling half retaining bolt (C28),
complete with spring washer and thrust washer
(C29 and C22).
NOTE: Shaft will move forward under action of the
mechanical seal spring.
7. Remove coupling half and key.
8. Remove four capscrews (C32) and spring
washers (C33).
9. Withdraw bearing retainer (C16), complete with
lipseal (C17).
10. Shaft sleeve (C18) may come away with bearing
retainer.
11. Inspect shaft sleeve sealing surface for damage
and replace if necessary.
12. Remove 'O' ring (C19) from bearing retainer.
13. Remove lipseal, noting orientation of seal in
housing.
14. Clean lipseal seating area thoroughly.
Refitting
1. Oil new seal and push into position ensuring
correct orientation.
2. If removed, smear shaft sleeve (C18) with grease,
and replace taking care not to pinch or dislodge
'O' ring (C19).
3. Fit new 'O' ring (C19) to bearing retainer and
smear with oil or grease.
4. Carefully replace bearing retainer, over shaft
sleeve.
5. Refit capscrews and spring washers.

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9
6. Refit coupling half complete with key (C26) thrust
washer (C22), spring washer (C29) and screw
(C28). Use Loctite 242 Threadlock or similar, on
screw thread.
7. Tighten screw (C28) to a torque of 40 Ibf-ft
(5.5Kgf-m).
8. Reassemble pump to engine and baseplate.
9. If removed, replace volute as Section 7.1.1.
10. Refit drain plugs, and refill chambers with 10W/30
oil.
5.1.8 Bearings
Removal
NOTE: Prior to removing pump from chassis, ensure
stability of chassis by supporting as necessary.
1. Drain oil from both chambers by removing drain
plugs (C27).
2. Remove volute as Section 7.1.1.
3. Remove impeller as Section 7.1.2.
4. Remove mechanical seal as Section 7.1.4.
5. Remove mechanical seal housing (B14).
6. Remove Air Pump as Section 7.4.
7. Remove capscrews joining pump to engine.
8. Remove screws joining mounting foot to base
plate.
9. Slide pump away from engine to disengage
coupling, and lift away to a suitable working area.
10. Remove bearing retainer (C07) and shaft sleeve
(C10) as Section 7.1.6.
11. Remove capscrews (C32) and washers (C33)
from bearing retainer (C16).
12. Mark air pump conn rod assembly (C02), to
ensure it is refitted in the same orientation as
original build.
13. Support air pump conn rod to prevent damage.
14. Remove shaft (C05), through bearing (C06),
toward coupling end. Note, on clearing bearing,
shaft will be free to fall through bearing housing,
and so must be carefully supported.
15. Inner race of roller bearing (C06), and entire
bearing (C15) will remain on shaft, and should be
removed and discarded.
16. Remove air pump conn rod (C02) from bearing
housing aperture.
17. Remove circlips (C12 and C20).
18. Remove coupling half, shaft sleeve and bearing
retainer from shaft.
19. Remove bearing race from housing and discard.
Refitting
1. Thoroughly clean bearing housing.
2. Inspect shaft for damage, paying particular
attention to sealing surfaces and bearing
diameters, and renew if necessary.
3. Refit circlips (C12 and C20).
4. Fit ball bearing (C15) onto shaft (C05), ensuring
inner race fully abuts to shoulder and is square.
5. Fit 2 new 'O' rings (C21) onto shaft and smear
with oil or grease.
6. Inspect surface of shaft sleeve (C18) and replace
if necessary. Smear shaft sleeve with grease and
fit onto shaft, taking care not to pinch or dislodge
'O' ring.
7. Inspect lip seal (C17) and replace if necessary.
8. Fit new 'O' ring (C19) onto bearing retainer (C16)
and smear with oil or grease.
9. Carefully slide bearing retainer, complete with lip
seal, onto shaft sleeve.
10. Refit key (C26).
11. Refit coupling half and secure with screw (C28),
spring washer (C29) and thrust washer (C22).
12. Fit inner race of roller bearing (C06) onto shaft
and secure in place with an old shaft sleeve or a
suitable length of tube.
13. Pass shaft assembly into bearing housing from the
coupling end, taking care to avoid damaging
machined surfaces.
14. When impeller end of shaft becomes visible
through air pump aperture, carefully slide air pump
conn rod (C02) over shaft, ensuring that conn rod
is replaced in the same orientation as originally
fitted.
15. Continue passing shaft into bearing housing until
bearing and retainer locate in position. Secure
with screws (C32) and spring washers (C33),
hand tight only at this stage.
16. Fit remainder of roller bearing (C06) over shaft
and into bearing housing.
17. Inspect surface of shaft sleeve (C10) and replace
if necessary. Smear shaft sleeve with grease and
fit onto shaft, taking care not to pinch or dislodge
'O' ring.
18. Inspect lip seals (CC08 and C09) and replace if
necessary.
19. Fit new 'O' ring (C14) onto dowel (C13) and smear
with oil or grease.
20. Fit new 'O' ring (C11) onto bearing retainer (C07)
and smear with oil or grease.
21. Carefully slide bearing retainer, complete with lip
seals, onto shaft sleeve, ensuring dowel locates in
hole in rear of bearing retainer. Secure with
screws (C32) and spring washers (C33), hand
tight only.
22. Gradually tighten screws (C32) in both bearing
retainers, rotating shaft periodically to ensure free
movement.
23. Refit air pump assembly as Section 7.2.
24. Fit new 'O' ring (B17) to bearing housing and
smear with oil or grease.
25. Refit mechanical seal housing (B14), taking care
not to pinch or dislodge 'O' ring.
26. Refit shims.

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27. Fit new 'O' ring (B16) to mechanical seal housing
and smear with oil or grease.
28. Fit a new mechanical seal as Section 7.1.4.
29. Refit impeller as Section 7.1.2.
30. Refit volute as Section 7.1.1.
31. Check and adjust impeller front clearance as
Section 7.1.3.
32. Refit separator as Section 7.2.
5.2 Separator Assembly
5.2.1 Float
Removal
1. Disconnect air pump hose (D30) by loosening
hose clip (D31).
2. Remove fasteners from top cap (A01), and lift top
cap away complete with float and peel valve
assemblies.
3. Note orientation of float, relative to suction tube.
4. Release locknut (A23), and unscrew float (A10)
from operating rod (A09). Note; do not allow
operating rod to rotate as this may cause damage
to the peel valve (A04).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Float must be fitted in the correct orientation, i.e.
with the flattened sides of the float aligned with the
sides of the suction tube.
2. Inspect gasket (A02) and replace if necessary.
5.2.2 Peel Valve
Removal
1. Remove separator top cap as Section 7.2.1.
2. Remove float as Section 7.2.1.
3. Undo screws (A21) and separate top cap (A01)
from peel valve assembly.
4. Slide upper diffuser (A08) off operating rod (A09).
5. Remove screws (A19) and clamp bar (A05),
retaining peel valve (A04) to port plate (A03).
6. Remove screws (A19), nuts (A20) and clamp bars
(A05), retaining peel valve to operating plate
(A06).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Do not overtighten fasteners securing peel valve,
otherwise the rubber will distort and not seal
correctly.
2. When fitting screws (A19) peel valve to port plate,
and (A21) upper diffuser and port plate to top cap,
seal threads with a suitable compound. Failure to
do this will result in reduced priming performance.
5.2.3 Lower Diffuser
Removal
1. Remove separator top cap as Section 7.2.1.
2. Remove screws (A16) and spring washers (A18).
3. Lift off separator body (A11).
4. Lift out lower diffuser (A13).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Inspect gaskets (A12) and replace if necessary.
5.3 Delivery Valve Assembly
5.3.1 Delivery Valve
Removal
1. Remove nuts (B21) and spring washers (B22),
and lift off valve body (B03).
2. Remove gasket (B04).
3. Remove screws (B24) and spring washers (B25).
4. Remove clamp bar (B05).
5. Delivery valve assembly can now be lifted away,
as can spacer bar (B09).
6. Valve assembly can be separated, if necessary,
by removing nut (B23).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Inspect valve rubber (B08) and replace if
necessary.
2. Ensure clamp bar (B05) is correctly fitted, with
curved edge towards valve rubber.
3. Inspect gasket (B04) and replace if necessary.
5.4 Air Pump Assembly
5.4.1 Air Pump Suction Valve
Removal
1. Remove hose to separator (D30).
2. Remove bolts, nuts and washers retaining pump
body halves (D03 and D06).
3. Lift off outer pump body (D03) to reveal valve
assembly on underside.
4. Remove screw (D26) together with valve clamp
(D09) and valve rubber (D08).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Inspect valve rubber (D08) and replace if
necessary.
2. When refitting outer pump body (D03), pull down
evenly ensuring actuator seal (D05) is correctly
located.

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11
5.4.2 Actuator Suction Valve
Removal
1. Remove outer pump body (D03) as Section 7.4.1.
2. Remove actuator retaining bolt (D24) with
belleville washer (D25).
3. Prise actuator seal (D05) away from inner pump
body (D06).
4. Remove actuator (D04) complete with seal (D05)
from drive rod (C01), ensuring neck seal (D07) is
not disturbed.
5. Invert actuator (D04) to reveal suction valve,
which may be serviced as Section 7.4.1.
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Examine upper surface of neck seal (D07), and
replace if necessary. See Section 7.4.5.
2. Lubricate outer surface of actuator seal (D05) with
soft soap (do not oil or grease).
3. Position actuator assembly onto drive rod (C01).
4. Fit belleville washer (D25) with domed side
uppermost, and retain with bolt (D24). Tighten to
a torque of 42 lbf-ft (31 Kgf-m)
5. Ensure outside surface of actuator seal (D05) fully
locates in inner pump body (D06).
5.4.3 Actuator Seal
Removal
1. Remove outer pump body as Section 7.4.1.
2. Remove actuator assembly as Section 7.4.2.
3. Prise actuator seal (D05) away from actuator
(D04).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Examine actuator seal (D05) and replace if
necessary.
2. Lubricate inner surface of actuator seal with soft
soap (do not oil or grease).
Fit actuator seal to actuator (D04), ensuring taper on
outer surface matches taper on air pump inner body
(D06).
5.4.4 Air Pump Discharge Valve
Removal
1. Remove outer pump body as Section 7.4.1.
2. Remove actuator assembly as Section 7.4.2.
3. Remove capscrews (D27) and washers (D28).
4. Note orientation of discharge elbow (D01) on inner
pump body (D06).
5. Lift off inner pump body (D06).
6. Remove nuts (D18) and washers (D19), and
remove discharge elbow (D01) to reveal discharge
valve assembly.
7. Discharge valve assembly can be serviced as
Section 7.3.1.
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Ensure inner pump body (D06) is replaced with
discharge elbow (D01) in the correct orientation.
5.4.5 Actuator Neck Seal
Removal
1. Remove outer pump body as Section 7.4.1.
2. Remove actuator assembly as Section 7.4.2.
3. Remove inner pump body as Section 7.4.4.
4. Prise neck seal (D07) from housing (D14).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Inspect neck seal and replace if necessary. It
should be noted that over long periods of use,
these seals may develop cracks around the inner
neck diameter. When these have grown to half to
three quarters of the original thickness, the seals
should be replaced. Radial cracks in the seals
can be ignored.
2. It is recommended that both actuator seal (D05)
and neck seal (D07) are replaced at the same
time.
3. Lubricate neckseal with soft soap (do not oil or
grease), and push into inner pump body (D06).
4. The pump should not be operated for long periods
with failed seals.
5.4.6 Air Pump Drive Rod and Seals
Removal
1. Remove outer pump body as Section 7.4.1.
2. Remove actuator assembly as Section 7.4.2.
3. Remove inner pump body as Section 7.4.4.
4. Remove actuator neck seal as Section 7.4.5.
5. Remove screws (D29) and washers (D22).
6. Lift off pedestal (D14), complete with seals and
bush.
7. Remove circlip (C24), support drive rod (C01) and
drive out fulcrum pin (C03).
8. Remove circlip (D13) from pedestal (D14).
9. Remove wiper seal (D10), seal carrier (D12) and
distributor seal (D11), noting their position and
orientation.
10. If necessary, push out linear bearing (D16).
Refitting
Refitting is the reverse of the removal procedure, with
the following notes:
1. Inspect all seals and replace as necessary.
2. Inspect gasket (D15) and replace if necessary.
3. If removed, bearing (D16) should be replaced.

Selwood D75 Manual
12
4. Lubricate bearing (D16) and push into pedestal
until bottom edges of bearing and pedestal are
level. Use service tool 0015168000.
5. Apply grease to seal housing and slide distributor
seal (D11) sideways over circlip groove to avoid
damage, and then turn lip of seal down towards
bearing.
6. Press wiper seal (D10) into carrier (D12) with lip
uppermost, using service tool 0010103000.
7. Push carrier and seal into housing, with lip
uppermost, to contact distributor seal.
8. Fit circlip.
9. Prior to refitting, lubricate fulcrum pin (C03) and
bearing (D16) with clean oil.
10. When refitting pedestal (D14) over drive rod
(C01), care must be taken to avoid damage to
seals.

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13
6 FAULT FINDING GUIDE
This table gives only the most common symptoms arising in connection with water handling duties. Please consult
Selwood Ltd for further advice if the service fault is not described, and particularly if the duty has uncommon
characteristics.
At no time should the pump be run if its bearing housing or flushing chamber contain contaminated oil. Very small
volumes of oil may be lost from these chambers during a days normal running, but remedial action should
immediately be taken if the loss becomes excessive.
The most likely causes of failure are given in the sequence in which they should be investigated. For example, if the
pump will not prime, carry out the first service instruction that is listed and proceed to the second only if the first
proves to be inappropriate.
SYMPTOM POSSIBLE CAUSE ACTION
AIR HANDLING PERFORMANCE
1. Pump will not prime or primes
slowly.
Leaking suction pipework joints Tighten and if necessary remake
all joints
2. Pump will not prime or primes
slowly.
Faulty delivery valve assembly Inspect and renew if necessary
3. Pump will not prime or primes
slowly.
Faulty air pump valves Inspect and renew if necessary
4. Pump will not prime or primes
slowly.
Faulty actuator valve Inspect and renew if necessary
5. Pump will not prime or primes
slowly.
Faulty actuator seal Inspect and renew if necessary
6. Pump will not prime or primes
slowly.
Faulty actuator neckseal Inspect and renew if necessary
AIR PUMP DISCHARGING WATER
7. Significant amounts of water
passing out of Air pump
Faulty separator float Inspect and renew if necessary
8. Significant amounts of water
passing out of Air pump
Faulty separator (peel) valve Inspect and renew if necessary
PUMPING CAPACITY
9. Drop on output Worn impeller Inspect and renew if necessary
10. Drop on output Obstructed flow passages Check for solids in suction Tube,
around suction Strainer, and in
pipework generally
11. Drop on output Engine speed incorrectly set Check that speed is 2000rpm off
load
LEAKAGE AND CONDITION OF LUBRICATING OILS
12. Oil leaking from ports Behind
air pump
Worn seal assembly Inspect and renew if necessary
13. Significant drop in flushing
Chamber oil level
Mechanical or lip seal failure Inspect and renew if necessary
14. Significant drop in bearing
Housing oil level
Lip seal failure, or cause 12 Inspect and renew if necessary
15. Oil leaking from flushing
Chamber vent
Lip seal failure Inspect and renew if necessary
16. Emulsified or contaminated Oil
in flushing chamber
Mechanical seal failure Inspect and renew if necessary

Selwood D75 Manual
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7 PART LIST
7.1 Volute and Separator
ITEM DESCRIPTION PART NUMBER QTY
A01 Top Cap - Separator 7596053000 1
A02 Gasket - Top Cap 7596073000 1
A03 Port Plate - Peel Valve 7596067000 1
A04 Peel Valve 7596071000 1
A05 Clamp Bar - Peel Valve 7596070000 3
A06 Plate Operating 7596069000 1
A07
A08 Diffuser - Upper 7596065000 1
A09 Rod - Operating 7596068000 1
A10 Float 9565k02401 1
A11 Body - Separator 7596090000 1
A12 Gasket - Body 7596072000 2
A13 Diffuser - Lower 7596064000 1
A14 Volute 7596063000 1
A15
A16 Screw - Hex. Hd - M10x35 9000100351 8
A17 Nut - Hex - M10 9025100004 4
A18 Washer - Spring - M10 9030100229 8
A19 Screw - Pan. Hd - M4x12 9018040127 6
A20 Nut - Aerotite - M4 9025040307 4
A21 Screw - Pan.Hd - M4x16 9018040167 4
A22 Washer - Plain - M4 9030040027 4
A23 Nut - Hex - 1/4"BSW 9040407-01 2
When ordering spares, please state:
PUMP NUMBER - PART NUMBER - DESCRIPTION OF PART

Selwood D75 Manual
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Selwood D75 Manual
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7.2 Pump End and Delivery Valve
ITEM DESCRIPTION PART NUMBER QTY
B01 Cover - Delivery Valve 7596062000 1
B02 Gasket - Cover 7596091000 1
B03 Body - Delivery Valve 7596085000 1
B04 Gasket - Body 7597011000 1
B05 Clamp Bar - Delivery Valve 7596081000 1
B06 Plate - Upper 7596078000 1
B07 Plate - Lower 7596079000 1
B08 Valve - Rubber 7596082000 1
B09 Spacer Bar - Delivery Valve 7597216000 1
B10 Drain Tap 0003350000 2
B11 Wear Plate 7596055000 1
B12 Impeller Assembly 7596076000 1
B13 Mechanical Seal Assembly 7596093000 1
B14 Housing - Mechanical Seal 7596051000 1
B15 Foot - Bearing Housing 7596052000 1
B16 ‘O’ Ring 910700-004 1
B17 ‘O’ Ring 910600-002 1
B18 Nut - Hex - Long - M12 1589135000 2
B19 Stud - M12x30 9001250-09 2
B20 Stud - M12x35 9001250-06 4
B21 Nut - Hex - M12 9025120004 4
B22 Washer - Spring - M12 9030120229 4
B23 Nut - Hex - Self Locking - M8 9025080344 1
B24 Screw - Chs. Hd - M6x20 9000697-01 6
B25 Washer - Plain - M6 9030060027 2
*B26 Screw - Hex. Hd - M8x20 9000080201 1
B27 Capscrew - M10x25 9001047-01 1
B28 Seal Washer - M10 9001077-01 1
B29 Washer - Spring - M6 9000677-01 4
B30 Stud - M10x60 9001050-04 2
B31 Nut - Hex - M10 9025100004 6
B32 Washer - Spring - M10 9030100229 6
B33 Spacer - Foot 7597218000 4
B34 Stud - M10x40 9001050-05 4
B35 Plug - M16 9539M01601 1
B36 Shim - 0.15 7596083000 A/R
B37 Shim - 0.25 7596084000 A/R
B38 Shim - 0.5 7598303000 A/R
*B26 Part Number changed to 9000080251 M8 x 25 as of pump number 75SA234D
When ordering spares, please state: PUMP NUMBER - PART NUMBER - DESCRIPTION OF PART

Selwood D75 Manual
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.

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7.3 Bearing and Air Pump Mechanism Housing
ITEM DESCRIPTION PART NUMBER QTY
C01 Drive Rod Assembly - Air Pump 1590104000 1
C02 Connecting Rod Assembly - Air Pump 1589102000 1
C03 Fulcrum Pin 1589094000 1
C04 Bearing Housing 7596080000 1
C05 Drive Shaft 7596060000 1
C06 Bearing - Roller 930110-003 1
C07 Retainer - Bearing 7596057000 1
C08 Seal - Oil 910110-004 1
C09 Seal - Oil 910110-003 1
C10 Sleeve - Shaft 7596059000 1
C11 'O' ring 910200-003 1
C12 Circlip 94D130072A 1
C13 Dowel - Hollow 7598256000 1
C14 'O' ring 910000-001 1
C15 Bearing - Ball 930100-001 1
C16 Retainer - Bearing 7596056000 1
C17 Seal - Oil 910110-002 1
C18 Sleeve - Shaft 7596058000 1
C19 'O' ring 910200-005 1
C20 Circlip 94D130080A 1
C21 'O' ring 910100-002 2
C22 Washer - Thrust - Coupling 7596061000 1
C23 Coupling Assembly (for Hatz1D41Z Diesel Engine) 9600M02502 1
Coupling Assembly (for Lombardini 15LD440) 9600M02301 1
C24 Circlip 9401000151 2
C25 Key 9000099-05 1
C26 Key 9000099-04 1
C27 Plug - Drain 9522002000 2
C28 Screw - Hex. Hd - M10x25 9000100251 1
C29 Washer - Spring - M10 9030100229 1
C30 Screw - Hex. Hd - M8x20 9000080201 6
C31 Washer - Spring - M8 9030080229 6
C32 Screw - Cap - Hex Socket - M6x20 9005060200 8
C33 Washer - Spring - M6 9030060229 8
C34 Label - Oil Check 0015229000 1
C35 Screw - Hammer Drive 9045002259 2
C36 Breather 9528P00202 1
C37 Plug - Oil Filler - C/W Dipstick 7598304000 1
C38 Plug - Breather - C/W Dipstick 7598305000 1
C39 Dowel – 8x20 9000869-01 1
C40 Screw – Cheesehead – M5x6 9000594-01 1
When ordering spares, please state: PUMP NUMBER - PART NUMBER - DESCRIPTION OF PART

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