SELWOOD Seltorque S100 User manual

Selwood Seltorque S100 Manual
1
SELWOOD SELTORQUE S100
ELECTRIC SUPERSILENT
7.5KW STATIC – 1097206000
7.5KW S/SILENT – 1016133S40
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 trade marks.
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 1016133S40MAN
Published by Selwood Limited
© Selwood Limited June 2016
Instructions for Ordering
Replacement Parts
1. Always quote the pump serial number located on
the plate fastened to the bearing and air pump
mechanism housing.
2. Always quote the part number(s) (ten digit) of the
component(s), NOT the item number(s).
3. 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
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.
Q
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A
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Our products also conform to the E.E.C. Machinery
Safety Directive and carry the C.E. mark.
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 Seltorque S100 Manual
2
SAFETY PRECAUTIONS
WARNING
ALL ITEMS IN THIS SECTION, IF NOT STRICTLY
OBSERVED, COULD RESULT IN SEVERE
PERSONAL INJURY OR LOSS OF LIFE.
1. Use only lifting equipment of suitable capacity for
the size and weight of the equipment being lifted
2. 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.
3. Whilst lifting the unit keep personnel well away
and never allow people underneath.
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.
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.
6. Rotating equipment presents a hazard in itself.
Alert surrounding personnel before starting and
post notifications whilst in operation.
7. Moving parts are guarded to protect you. Guards
removed for maintenance must be replaced before
starting the pump.
8. Never insert anything into the pump body whilst
the pump is running and the suction or delivery
hoses are disconnected.
9. Use all flange bolt holes and ensure the correct
bolt size and quality is utilised when connecting
suction and delivery hoses.
10. Collapsible hoses must never be used on the
suction side of the pump.
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.
12. Always allow adequate ventilation for the pump
driver.
13. Be aware of burn and fire risks from items such as
exhaust pipes and silencers. Never place
flammable items around the unit.
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 2 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 local area when the unit is running. Failure to
comply may result in hearing damage or loss.

Selwood Seltorque S100 Manual
3
SELWOOD SELTORQUE S100
CONTENTS
Title Page
SAFETY PRECAUTIONS.............................................. 2
1 GENERAL INFORMATION................................ 4
1.1 Installation .......................................................... 4
1.2 Operation............................................................ 4
1.3 Maintenance ....................................................... 4
1.4 Electric Motors.................................................... 4
1.5 Fitting Instructions for Fenner Couplings
(Electric Motors).................................................. 4
2 SELTORQUE S100 STANDARD DATA ............ 5
3 ROUTINE MAINTENANCE ................................ 5
4 LUBRICATION AND FASTENING TORQUES.. 6
4.1 Pump Lubrication................................................ 6
Commissioning Period............................................... 6
After Commissioning Period...................................... 6
4.2 Fastening Torques.............................................. 6
4.3 CONDITIONS OF WARRANTY.......................... 6
5 MAJOR SERVICING .......................................... 7
5.1 Air Pump Maintenance ....................................... 7
5.1.5 Drive Rod Seal (A25 & A28)............................ 8
5.3.3 Delivery Valve, (C27).................................... 11
5.4.3 Bearings and Lip Seal (D15,D18,D04) ......... 13
6 WORKSHOP TOOLS....................................... 14
6.1 Care of Servicing Tools.......................................... 14
6.2 Fitting of Actuator Neck Seal.................................. 15
6.3 Removal of Mechanical Seal Stationary Seat
and Joint Ring................................................... 15
6.4Removal of Drive Rod Seal Assembly .................... 15
6.5 Fit Seal Housing Sub-Assembly to Pump .............. 16
6.6 .Support Remove Drive Rod Bearing Bush.......... 16
6.7.Fit New Bearing Bush ............................................ 16
6.8.Assemble Flushing Chamber ................................. 17
6.9.Remove Eccentric.................................................. 17
6.10.Remove Impeller.................................................. 17
6.11.Fit Replacement Drive End Bearing..................... 18
6.12.Fit Replacement Impeller End Bearing ................ 18
6.13.Assembly of Drive Shaft with Bearings into
Housing ............................................................ 19
7.FAULT FINDING GUIDE .......................................... 20
7 PARTS LIST..................................................... 25
7.1 Air Pump Parts.................................................. 25
7.2 Separator Parts................................................. 27
7.3 Delivery Valve Parts ......................................... 29
7.4 Pump Body Parts.............................................. 31
7.5 Bearing Housing and Air Pump Drive
Assembly Parts................................................. 33
7.6 S100 / 7.5kW 400/3/50 on Static Chassis -
1097206000...................................................... 35
7.7 S100 / 7.5kW SuperSilent Canopy Build –
1016133S40 ..................................................... 37
8 WIRING DIAGRAMS........................................ 38
8.1 3 Phase DOL .................................................... 38
8.2 PTC Thermistor Windings................................. 39
8.3 Space Heater.................................................... 40
8.4 Standard Terminal Box......................................41
8.5 Axial fan ............................................................42

Selwood Seltorque S100 Manual
4
1 GENERAL INFORMATION
1.1 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 system operating
pressure.
3. 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.
4. Similar precautions should be taken with clamps
securing multiple lengths of hose on installation
where long delivery and suction lines are involved.
5. Delivery hose and any associated pipework
should be capable of withstanding the maximum
system operating pressure. Suction hose should
be of the non-collapsible variety.
1.2 Operation
4. The pump should only be operated within the
speed and pressure limits detailed in the operating
handbook for the model in question.
5. 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.
6. 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
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.
1.4 Electric Motors
1. 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.
2. All electrical equipment should be adequately
earthed.
3. Isolate the power supply before carrying out any
commissioning, servicing or maintenance work on
the pump or electric motor.
4. 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 Health and Safety at Work 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.
1.5 Fitting
Instructions for
Fenner
Couplings
(Electric
Motors)
1. 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
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.
2. 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.

Selwood Seltorque S100 Manual
5
2 SELTORQUE S100
STANDARD DATA
Capacity 90M3/h
19800UK gal/h
Delivery Head 18m
70ft
Self Priming Lift 8.8m H20
29ft H20
Solids Size 75mm
3in
Air Handling Capacity 24l/s
50ft3/min
Pump Speed Max 1450rpm
Port Size BS4504 Table 6 100mm
4in
3 ROUTINE MAINTENANCE
Lack of routine maintenance is the most frequent
reason for the break-down of pumps. We earnestly
advise users to ensure that at least the following
actions are taken.
1. Check these two oil levels daily:
a) Bearing housing oil.
b) Flushing chamber oil.
2. Always drain water from the pump in cold weather
when it is not running. Drain:
a) Pump body.
b) Delivery valve chamber.
c) Both sides of air pump (4 drain taps if twin
prime).
3. 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.
4. 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.
5. A hose strainer should always be fitted to the free
end of the suction line if there is a possibility of
over-sized solids entering the pump. The
dimensions of rocks, pebbles, etc., must not
exceed 75mm (3"). Larger soft solids, however, of
the type found in abattoir duties, for example, will
pass freely through the pump. Refer to Selwood
Pumps 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 pipe-work joints, we recommend that all
line fittings associated with the pump should be
checked periodically for air-tightness.
7. Periodically check the tension of all nuts and bolts,
especially those securing the motor and pump to
the chassis.
8. Pump servicing must always be carried-out in
accordance with the instructions given in this
manual. Only components supplied and approved
by Selwood Pumps should be used. It is
advisable to hold a small stock of spare parts to
cover break-down circumstances. The Company
will be pleased to give advice in this connection.
9. Please contact Selwood Pumps 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.
10. All practical work must be carried-out in
compliance with the Health and Safety at Work
Act, 1975.
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.

Selwood Seltorque S100 Manual
6
4 LUBRICATION AND
FASTENING TORQUES
4.1 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 Q8 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.
COMPARTMENT
SERVICE/DRAIN
CHANGE OILS CHECK &
TOP UP
Bearing Housing
Flushing Chamber 250 – 500 Hours Daily
Actuator Bore
Impeller Bore
Shaft Sleeve Bore
ON ASSEMBLY -
Paper Gaskets ON ASSEMBLY -
-
M10 Screws - Port
Plate To Diffuser ON ASSEMBLY -
Commissioning Period
Drain both pump chambers within 100-150 running-
hours of commissioning either a new or rebuilt pump,
and refill with new oil to level plugs.
Flushing chamber capacity, approx 1.5litres (2.5 pints).
Bearing housing capacity, approx 1.8litres (3 pints).
After Commissioning Period
The oil in both pump chambers should be drained and
renewed. This will usually require the pump oils to be
drained and replaced every 250 running hours. Under
no circumstances should the period for the pump
exceed 500 running hours.
4.2 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 Tightening
Torques
lb ft kgf m
Pump M16 Fixings 180 25
(D36) Actuator Cap Screw
0015975000
60 8.3
(A22) Cap Screw M12
9005120552
60 8.3
(C01) Impeller Screw
9000120302
60 8.3
Air Pump Drive rod (D37) to Small
end of Connecting Rod(D26) - M8
Fixing (D27) to (D38)
21 2.9
4.3 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.
This warranty does not apply to:
5. The driver or any accessories or proprietary
fittings whatsoever;
6. Any pump which, in the opinion of Selwood, has
been altered, used, maintained, serviced or stored
otherwise than in accordance with Selwood
instructions and professional practice;
7. Any pump wherefrom the serial numbers have
been removed or altered;
8. Fair wear and tear;
9. Consequential loss or damage.
COMPONENT BP GRADE
Bearing Housing T750 – 15W/40
Flushing Chamber T750 – 15W/40
Actuator Bore Rubens
Impeller Bore Rubens
Paper Gaskets Rembrandt
M10 Screws - Port Plate
to Diffuser
Castrol Optimoly Paste
HT

Selwood Seltorque S100 Manual
7
5 MAJOR SERVICING
5.1 Air Pump
Maintenance
5.1.1 Delivery & Suction Valves (A07)
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 item (A01) from suction valve
box (A03), after loosening relevant hose clips
(A02).
2. Note the orientation of the suction valve box (A03)
and exhaust cover (A04) before commencing.
Remove exhaust cover (A04) and suction valve
box (A03) by releasing nuts (A05) and spring
washers (A06).
NOTE: The previous actions allow the condition of the
two valve rubbers (A07) to be checked. Do NOT
attempt to remove valve studs (A08). If valve rubbers
are damaged, replace with new components. Pull old
valves off stud heads, and discard.
3. Check and, if necessary, clean valve seats in
outer pump body (A15) and valve box (A03).
Smear heads and grooves of studs with soft soap
and push on new valves ensuring that they seat
correctly.
4. The valve assemblies can now be replaced by
reversing Instruction 1 and 2 of this procedure. It
is advisable to fit new gaskets (A30).
5.1.2 Actuator Valve (A16)
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 (A16).
To inspect and service, proceed as follows:
1. Remove nuts (A11), spring washers (A12),
washers (A13) and screws (A14), allowing outer
pump body (A15) to be removed complete with
attached delivery valve assembly. The actuator
valve (A16) may now be examined. If it fails to
seat efficiently on actuator (A20) or is in any way
damaged, it should be pulled off the actuator nut
and discarded.
2. Whilst the actuator valve (A16) is removed, it is
advisable to examine the condition of the valve
seat in the actuator (A20), and also to check the
security of the actuator screw (D36). This should
be checked and tightened to 60lbf ft (8.3kgf m)
torque.
3. To replace actuator valve (A16) smear soft soap
on the conical end and groove of actuator screw
(D36) and ease new valve rubber into position
ensuring that it seats correctly.
NOTE: It is advisable to examine the condition of
actuator seal (A18) whilst it is exposed.
4. To replace outer pump body assembly, fit and
evenly tighten screws (A14), washers (A13),
spring washers (A12) and nuts (A11), by
sequentially turning each screw a small amount
until they are all fully tensioned. It is important
that the outer diameter of the actuator seal (A18)
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 (A18).
To inspect and service, proceed as follows:
1. Remove outer pump body (A15) complete with
delivery valve assembly. Remove actuator screw
(D36).
2. Remove outer pump body (A15) complete with
delivery valve assembly. Remove actuator screw
(D36).
3. 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 (A18) by prising it from the
inner pump body (A19). Remove actuator (A20)
complete with seal from drive rod (D37).
4. To renew actuator seal (A18) remove failed
component from actuator, insert firstly one side
and then the other into the actuator groove, using
a blunt tool that will not cut the rubber.
NOTE: The seal is handed and will not enter the inner
pump body (A19) if fitted the wrong way round.
5. The correct assembly position for actuator seal
(A18) is with the smaller diameter of its conical
outer surface towards the inner pump body (A19).
It will be seen that the housing in the body is
tapered in the same direction as the external
surface of the seal.
6. At this stage it is advisable to examine the
condition of actuator neck seal (A21). This
component should be replaced if any splits are
evident on its visible surface.
7. Smear soft soap on the outside section of new
actuator seal (A18). Lightly grease actuator bore.
Position actuator/seal assembly on drive rod
(D37), locate actuator screw (D36) and tighten to
60lb ft (8.3kgf m) torque.
8. Replace actuator valve if removed (A16) first
smearing soft soap on the conical end and groove
of actuator screw (D36). The new valve should be
eased into position by hand.
9. Before fitting outer pump body (A15) 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 (A18) is
likely to rotate slightly in the inner pump body
(A19). Stop shaft rotation when actuator is at
bottom dead centre (minimum distance from inner
pump body).

Selwood Seltorque S100 Manual
8
10. Seat outside section of actuator seal in inner
pump body recess by gently tapping with a non-
metallic mallet.
11. Replace outer pump body assembly, and fit and
evenly tighten screws (A14) washers (A13) spring
washers (A12) and nuts (A11), by sequentially
turning each screw a small amount until they are
all fully tightened. It is important that the outside
diameter of the actuator seal (A18) should be
clamped evenly.
5.1.4 Actuator Neck Seal (A21)
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 (A21).
To investigate and service, proceed as follows:
1. Remove outer pump body (A15) complete with
delivery valve assembly, and actuator (A20) with
actuator seal (A18) as directed in Section 5.1.3.
2. Release hose clip (A02) allowing air hose to be
disconnected from suction valve box (A03).
Screws (A22) should then be removed, leaving
washers (A23) in inner pump body (A19).
3. The inner pump body can now be pulled by hand
from the bearing housing, if necessary twisting to
overcome any tendency of the seal (A21) to stick
to drive rod (D37). Remove and discard failed
seal.
4. Smear new actuator neck seal (A21) with soft
soap to assist fitting, position in inner pump body
(A19) and push both components over drive rod
(D37) using assembly tool (Part No. 0015102000)
smeared with soft soap. Check that washers (A23)
are in place, and fit and fully tighten screws (A22).
The heads of these screws should be fully
contained within the recesses in the inner pump
body.
5. Reassemble remaining components in
accordance with Section 5.1.3
5.1.5 Drive Rod Seal (A25 & A28)
If oil leaks from ports in housing (A24) it is probable
that seal assembly (A25) is excessively worn. Such a
condition may also indicate that drive rod bush (A28)
should be replaced.
To inspect and service, proceed as follows:
1. Drain oil from bearing housing by removing
filler cap (D08) and drain plug (D13).
2. Remove air pump components in accordance
with previous instructions.
3. Being careful not to damage the flat sealing
faces of housing (A24), carefully withdraw
housing complete with its bearing and sealing
components from bearing housing (D06) and
drive rod (D37).
4. Examine condition of lip and distributor seals
together with bearing. If either are worn or
damaged, we recommend that a new housing
(Part No. 0010905000) complete with seal
assembly and bearing (A28) should be
ordered and fitted. However, individual
components can be renewed in accordance
with the following instructions.
5. To replace drive rod bearing (A28) carefully
remove circlip (A26) allowing seal components
to be pushed from housing 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 the end of the housing.
6. Ensure that seal components are assembled
in accordance with the following instructions.
a) The wiper seal (A34) is first assembled to the
drive rod seal carrier (A32) using wiper seal
insertion tool (Part No. 0010103000) ensuring
the correct. orientation.
b) Then the internal distributor seal (A33) is
offered up to the bearing and seal housing
(A24) ensuring again the correct orientation
and pushed into place with the drive rod seal
carrier (Part No 0015195000) (together with
wiper seal (A34)) and the whole pressed into
place with the wiper seal insertion tool (Part
No. 0010103000). Care must be exercised
when replacing circlip (A26) to ensure that the
lip of the wiper seal (A34) is not damaged by
the hand tools used. See Section 6.4.
7. Before replacing bearing/seal housing
assembly, check condition of drive rod,
particularly if new bush (A28) has been fitted.
If surface is significantly worn, the drive rod
should be replaced in accordance with
instructions given in Section 0.2.
8. Assembly tool (Part No. 0015101000) must be
used when replacing bearing/ seal housing
assembly to ensure that the wiping edges of
the seal assembly (A25) are not damaged.
The drive rod must be smeared with clean oil
to assist this procedure. See Section 6.5.
Gasket (A27) must be renewed, always use a
component supplied by Selwood Pumps.
Ensure that ports in housing (A24) are in the 3
and 9 o'clock positions.
9. Reassemble remaining pump components in
accordance with Section 5.1.4 instruction.
10. Replace drain plug (D13) together with sealing
washer (D14) and refill bearing housing (D06)
with clean oil to level of plug (D08) and replace
plug together with ‘O’ ring (D07). Refer to
Section 3.1 Pump Lubrication for details of the
oil required for the Bearing Housing.
Separator Maintenance
5.2.1 Float (B11)
If water in significant quantities continuously passes
through the exhaust valve (A07) of the air pump, it is
probable that the float (B11) is in need of replacement.
To inspect and service, proceed as follows:
1. Disconnect air hose (A01) by loosening hose clip
(A02)
2. Remove nuts (A11) and washers (A12) and lift off
separator cap (B01) complete with peel

Selwood Seltorque S100 Manual
9
valve/upper diffuser assembly, (B01) to (B21)
inclusively. Examine condition of float (B11) and
replace with new component if punctured or
significantly worn.
3. Check condition of peel valve rubber (B21) and
bush (B07) replacing them, if necessary, in
accordance with advice commencing at Section 7
n hose clip (A02)
4. 5.2.2 Peel Valve (B21).
5. Also check for deposits of solids likely to interfere
with the smooth working of the float system.
6. When fitting a new float, ensure that it is securely
tightened against nut (B12). During this
procedure, the float should be positioned on the
rod so that the operating plate (B15) with its
associated peel valve fasteners is just clear of the
central clamp-bar screws (B16), when the float is
located in the upper-diffuser cone.
7. If all components are seen to be in satisfactory
condition, replace separator cap assembly,
washers (A12) and nuts (A11). 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 (A02)
5.2.2 Peel Valve (B21)
If significant quantities of water are discharged from
the exhaust valve (A07) of the air pump, and the float
(B11) 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 (B01) to
(B21) and unscrew float (B11) and nut (B12).
2. Release screws (B09) and spring washers (B10)
to allow upper-diffuser/valve assembly to be
withdrawn.
3. Remove screws (B04) and sealing washers (B05)
to allow upper diffuser (B06) to be removed from
the port plate sub-assembly.
4. Examine condition of peel valve rubber (B21) and
air ports in plate (B03) 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 (B16).
5. To fit new peel valve rubber (B21), carefully clean
existing parts thoroughly, especially surfaces of
port plate (B03), and clamp bars (B19), and
position new rubber on plate. Assemble screws
(B16), clamp bar (B19), clamp bar seal (B20),
washer (B18) and nuts (B17) 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(B21)
to the operating plate (B15) noting that the
components & method of assembly are identical to
5.2.2 Peel valve except that the clamp bar seal is
omitted – do not over tighten nuts.
7. Now check that the peel valve rubber is capable
of closing all of the air holes in port plate (B03)
when operating rod (B13) is square to the plate
and fully lifted.
8. Check condition of bush (B07) in upper diffuser
B06) and replace, together with clip (B08) and
Nitrile washer (B35) if significantly worn.
NOTE: The operating rod (B13) is normally a slack fit
in the bush.
9. Position port plate sub-assembly on upper diffuser
(B06), fit washers (B05) after checking that they
will seal efficiently and fully tighten screws (B04).
Reassemble nut (B12) and screw float (B11) on to
operating rod and tighten securely in accordance
with Section 0 Float (B11) Instruction 6.
10. Recheck operation of peel valve rubber (B21) to
ensure that it fully covers air ports in plate (B03)
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 (B16) and the operating plate (B15).
Adjust the position of the float on the operating rod
to obtain the correct dimension.
11. Examine condition of gasket (B02) and renew, if
necessary, before installing between port plate
(B03) and separator cap (B01). Fit spring
washers (A12) and screws (A11) each of which
should be sequentially turned a small amount until
fully tightened. Gasket (B02) must be evenly
compressed.
12. Replace separator cap sub-assembly in
accordance with Section 0 Float (B11)
Instruction 6.
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 Float (B11)
Instructions 1, 2 and 3, allowing separator body
(B22) together with lower diffuser (B24), to be
lifted off the suction tube (B27).
2. Remove any deposits of scale from lower diffuser
(B24) and check condition of welds securing its
circular bottom to the perforated cylinder.
Remove any solids that may have accumulated in
the suction tube (B27), renew gasket (B25) and
reposition separator-body/lower-diffuser assembly
on suction tube.
8. Remove deposited materials from surfaces of
upper diffuser (B06) and note, in particular, the
condition of welds securing cone and disc to
perforated diffuser body. Also examine diffuser
bush (B07) and operating rod (B13), and replace if
significantly worn in accordance with Section 7 n
hose clip (A02)
†Use lower Diffuser (Part No. 0015038100) for sludge
handling duties. This is recognised by holes in the base as
well as around the side.
‡Use lower Diffuser (Part No. 0015038000) for other
applications where no solids are present which can adhere to
the internal surfaces.

Selwood Seltorque S100 Manual
10
3. 5.2.2 Peel Valve (B21) 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
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 Float (B11)
Instruction 6. Any re-assembly work carried out
on the peel valve assembly should be in
accordance with Section 5.2.2 Peel Valve (B21)
commencing at Instruction 1.
Impeller, Mechanical Seal and Delivery Valve
Maintenance
5.3.1 Impeller (C04)
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. Remove air hose item (A01) from separator cap
(B01), after loosening hose clip (A02).
2. Remove nuts (A11) and washers (A12), and lift off
separator cap (B01) complete with peel
valve/upper diffuser assembly, (B01) to (B21)
inclusively.
3. Lift separator body (B22) complete with lower
diffuser (B24) off suction tube (B27) allowing
(dome) nuts (B29) and spring washers (B30) to be
released.
4. Withdraw suction tube (B27) and gasket (B28)
after removing nuts (B29) and associated spring
washers (B30).
5. Drain oil from flushing chamber by removing filler
cap assembly (D08) and drain plug (D34). 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
commencing at Instruction 1.
6. Remove impeller screw (C01) and washers (C02)
and (C03), and withdraw impeller (C04) from drive
shaft (D17). To remove the screw, it will be
necessary to lock the impeller by means of a
wooden block wedged between the impeller
blades and pump body (C09).
NOTE: An impeller removal tool (Part No.
0015WRS781) is available to facilitate removal of the
impeller - see Section 0.
7. Removal of the impeller will allow the mechanical
seal spring to expand. Do NOT touch the shaft
sleeve (C06) or spring if the mechanical seal has
been functioning correctly and only the impeller is
to be replaced. Premature failure of the
mechanical seal assembly could result if the seal's
faces are disturbed by moving the shaft sleeve.
8. When fitting a new impeller, ensure that key (C05)
is not a tight fit in the impeller keyway. If
necessary, remove very small amounts of metal
from the sides of the key to achieve a close sliding
fit that will not allow any perceptible rotation of the
impeller on the shaft, and yet allow the impeller to
slide into place by hand. Apply Rustilo 431 grease
(or approved equivalent) to all impeller mounting
surfaces.
9. Check condition of nylon patch on impeller screw
(C01). It is essential that this screw should be stiff
to turn in the thread of the shaft. On no account
use a screw that moves freely. Use a new screw
if the head of the original component is abraded or
if the screw is not a friction fit in the shaft thread.
Do NOT lubricate these threads.
10. Ensuring that the mechanical seal spring is in
position, replace impeller (C04), washer (C03) two
washers (C02) with concave faces towards
impeller and impeller screw (C01), and tension
screw to 60lb ft (8.3kgf m) torque. It is essential
that this screw is correctly tensioned. During this
operation, it will be necessary to lock the impeller
by means of a wooden block wedged between the
impeller blades and pump body (C09). Remove
block after use.
11. Use Rustilo 431 on the inside of the pump
register. Fit new gasket (B28), position suction
tube on studs, fit washers (B30) and fully tighten
nuts (B29).
12. Renew gasket (B25), reposition separator body
sub-assembly on suction tube, and fit separator
cap assembly. Assemble washers (A12) and nuts
(A11) and alternatively tighten each nut a small
amount to ensure that the cap is pulled down
evenly. Do NOT over-tighten.
13. Reposition air hose (A01) on spigot of separator
cap (B01) and tighten hose clip (A02).
14. Replace drain plug (D34) using PTFE tape as a
sealant, and fill flushing chamber with new oil to
level of plug. Replace plug and 'O' ring (D08) and
(D07). Refer to Section 3.1 Pump Lubrication for
details of the oil required for the flushing chamber.
5.3.2 Mechanical Seal (C08)
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 a breather cap (D12). Under extreme
conditions, pumped fluid may be seen escaping out of
the vent at the bottom of flushing chamber (D33).
In the event of abrasive materials being detected in the
oil, it is likely that lip seal (D04) will have become worn
and necessitate replacement in accordance with Section
5.4.3 Bearings and Lip Seal (D15, D18 and D04).
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. Drain oil from flushing chamber (D33) by removing
its filler cap (D08) and drain plug (D34).
2. Remove impeller (C04) in accordance with
Section 0 Impeller (C04) Instructions 1 to 7
inclusively, and remove impeller key (C05).
3. Withdraw shaft sleeve (C06) together with rotating
mechanical seal parts and spring. It is likely that

Selwood Seltorque S100 Manual
11
(C07) will be withdrawn with the sleeve remove it
and check condition. Replace ‘O’ ring if unsuitable
for further service.
4. Using seat removal tool (Part No. 0015166000),
withdraw mechanical seal stationary seat from its
housing in pump body (C09). Also remove the
seat's rubber joint ring. (See Section 0).
5. The rotating parts of mechanical seal (C08) should
now be removed from the shaft sleeve and
discarded, taking care not to damage the sleeve's
surfaces. This operation should be carried-out by
hand using a tool that will not scratch the sleeve.
6. Once removed, examine condition of sleeve and
replace with new component if unacceptably
corroded or worn.
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.
7. Thoroughly clean recess in pump body (C09) and
also the surrounding surfaces. Smear lubricant
(soft soap or washing-up liquid, but not grease) in
recess and also on outside diameter of rubber
joint ring. Using several layers of clean soft paper
to protect the seating face, press seat into recess
by applying even finger-pressure. Make sure that
the highly-polished sealing face is on the impeller
side of the recess, that the new joint ring has been
used, and that the seat is positioned directly
against the shoulder at the bottom of the recess.
8. Smear lubricant on drive shaft diameters and ‘O’
ring (C07). Position ‘O’ ring on shaft taking care to
prevent it contacting the shaft's keyway. If a new
shaft sleeve (C06) is being used, ensure that it is
capable of sliding freely along the shaft and
correctly trapping the ‘O’ ring in the recess
provided.
9. Smear lubricant (soft soap) on outside diameter of
shaft sleeve (C06) and inside diameter of rubber
drive band. Protect the highly polished face of the
seal with several layers of clean soft paper, and
slide seal assembly onto sleeve using finger
pressure only - USE NO TOOLS. The seal must
be positioned so that the carbon face is about
3mm past the non-flanged end of the sleeve.
10. Within a few minutes, to ensure that the lubricant
has not set, slide sleeve seal assembly onto shaft
(seal face towards stationary seat) and press into
working position using only the sleeve's flange.
This procedure automatically causes the seal
head to slide along the sleeve into its correct
working position. Ensure that ‘O’ ring (C07) is
correctly trapped in sleeve recess (C06) and that
sleeve abuts against shoulder on shaft.
11. Push mechanical seal spring onto location
diameter provided on seal head. Ensure that the
spring's coils are correctly supported by the flange
of sleeve (C06) and will not become trapped
between the flange and the impeller (C04) Refit
key (C05) and impeller in accordance with Section
0 Impeller (C04) Instructions 8 to 10.
12. Replace remaining components in accordance
with Section 0 Impeller (C04) Instructions 11 to
14, inclusively.
5.3.3 Delivery Valve, (C27)
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 shutdown and the
delivery line has been drained.
2. Release T-bolt (C19), swing locking bar (C22)
clear, and remove inspection panel (C24) and
gasket (C25). It now becomes possible to lift the
valve by hand to expose the valve seat (C16) so
allowing foreign matter to be removed. Also
undertake a preliminary check of the condition of
the valve rubber.
3. If further disassembly is required, remove screws
(C29) and washers (A13), allowing clamping bar
(C28) and delivery valve (C27) complete with
valve plates (C26) and (C30) to be removed.
4. Separate upper and lower valve plates (C26) and
(C30) by removing nut (C31), and examine
condition of rubber (C27), especially along the
hinge line and seating surface. Discard if
damaged or mis-shapen.
5. To replace valve seat (C16), remove valve
chamber (C18) after releasing nuts (B31) and
spring washers (C15).
6. Reassemble components in reverse order,
renewing gaskets (C17) and (C25) if necessary.
Ensure that the radiused edge of clamping bar
(C28) is adjacent to hinge line of valve rubber
(C27) and that each screw is tightened a small
amount so as to produce an even clamping
pressure. Correctly tightened screws will not
cause the clamp bar to distort the rubber. Seal
screws with Loctite 572.
Maintenance of Flushing Chamber, Air Pump
Mechanism, Drive Coupling, Drive Shaft
Bearings and Lip Seal
5.4.1 Flushing Chamber (D33)
Leakage of oil through the vent at the bottom of
flushing chamber (D33) could be due to failure of either
of the lip seals (D30). If the pumped liquid also leaks
through the vent, the mechanical seal (C08) will
require to be replaced in addition to its adjacent lip seal
(D30).
In any of these events, proceed as follows:
1. Drain oil from flushing chamber and bearing
housing by removing filler caps (D08) and drain
plugs (D13) and (D34).

Selwood Seltorque S100 Manual
12
2. Remove separator assembly and suction tube
(B27) or (B35) in accordance with Section 0
Impeller (C04) Instructions 1 to 4, inclusively.
3. Remove impeller screws (C01) and washers (C02)
and (C03), and withdraw impeller (C04)
mechanical seal spring, and shaft sleeve (C06)
complete with mechanical seal parts (C08).
Handle the sleeve and mechanical seal with great
care and store in a safe place, particularly if these
parts are to be reused.
4. Remove split guard fitted around flexible coupling,
and release all of the coupling's fasteners allowing
the rubber tyre to be removed.
5. Attach lifting equipment to bearing housing and
pump body in compliance with requirements of
Health and Safety at Work Act, 1975.
6. Remove nuts, bolts and washers securing pump
to chassis and hoist clear, carefully noting the
positions of any shims between pump feet and
chassis.
7. Lower unit onto working surface and, in
compliance with Health and Safety at Work Act,
1975, tip pump onto ends of studs (C10) ensuring
that they are suitably protected from damage.
8. Remove nuts (A11) and spring washers (A12) and
carefully separate bearing housing and flushing
chamber assembly from pump body (C09).
During this operation, be very careful not to
damage the mechanical seal stationary seat by
allowing it to contact the shaft.
9. It now becomes possible to remove flushing
chamber (D33) from bearing housing (D06), after
releasing screws (D31) and spring washers (A06).
10. To replace lip seals (D30),
a) Press failed components out of housings and
discard.
b) Thoroughly clean all surfaces of flushing
chamber (D33) and press new seals into
position, ensuring that they face in the correct
directions: The garter spring fitted to the lip of
the seal nearest the bearing housing, should
be visible from the bearing housing side of the
flushing chamber. The garter spring fitted to
the lip of the seal nearest the impeller, should
be visible from the impeller side of the
flushing chamber. Refer to Section 0 for
disposition of seals.
11. Replacement of the flushing chamber sub-
assembly in the bearing housing must be
undertaken very carefully to ensure that the lips of
seals (D30) are not damaged by the shoulders on
the drive shaft (D17). Use assembly tool (Part No.
0010165100) for this purpose. A generous
quantity of oil should be applied to the shaft to
assist this operation, and a new gasket (C13)
should be fitted. Replace and tighten screws
(D31) and spring washers (A06).
12. Position new gasket (C13) on studs (C14) and fit
bearing housing assembly to pump body, taking
great care to ensure that the shaft does not touch
the mechanical seal stationary seat. Replace and
tighten nuts (A11) and spring washers (A12).
13. Using lifting equipment in compliance with the
Health and Safety at Work Act, 1975, position
pump unit on chassis.
14. Refer to Section 1.4 when refitting the pump to an
electric motor.
15. Replace split guards around flexible coupling and
ensure that it is securely fastened, with nuts bolts
and washers. Also fasten to flywheel guard where
applicable with bolts and washers.
16. Read Section 0 - 5.3.2 Mechanical Seal (C08)
Instructions 7 to 12, and carefully remove any
foreign matter from the sleeve and mechanical
seal components. Smear clean oil on both the ‘O’
ring (C07) and the drive shaft diameters. Position
the ‘O’ ring on the shaft taking care to prevent it
contacting the drive shaft's keyway, and slide the
sleeve/seal assembly onto shaft (carbon face
towards stationary seat) and press into working
position using only the sleeve's flange. Ensure
that ‘O’ ring is correctly trapped in sleeve recess.
17. Replace impeller, suction tube and separator
components in accordance with Section 0
Impeller (C04) Instructions 8 to 13, inclusively.
18. Replace, bearing / seal housing assembly & drive
rod seal assy plus Actuator neck seal in
accordance with their Section instructions.
19. Replace remaining air pump components in
accordance with section 5.1.3.
20. Replace drain plug (D34) using PTFE tape as
sealant and fill flushing chamber with new oil to
level of plug hole. Replace plug (D08) with ‘O’
ring (D07). Refer to Section 3.1 Pump Lubrication
for details of the oil required for the flushing
chamber.
21. Repeat this procedure for bearing housing
ensuring that level plug (D08) with ‘O’ ring (D07)
are replaced after the correct oil level is attained.
5.4.2 Air Pump Mechanism
Should actuator (A20) 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 bearing housing and flushing
chamber by removing filler caps (D08) with ‘O’ ring
(D07) and drain plugs (D13) with sealing washer
(D14) and (D34).
2. Remove air pump components in accordance with
Section 5.1.3 (discard actuator neck seal if it has
failed).
3. Being careful not to damage the flat sealing faces
of housing (A24) carefully withdraw housing
complete with bearing and sealing components
from bearing housing (D06) and drive rod (D37).
4. Carry out Section 0 Impeller (C04) Instructions
2 to 4, inclusively.
5. Carry out Section 5.4.1 Flushing Chamber
(D33) Instructions 3 to 9, inclusively.

Selwood Seltorque S100 Manual
13
6. Release nut (D38) and withdraw screw (D27),
allowing fulcrum pin (D28) to be removed. Drive
rod (D37) and connecting rod (D26) may then be
withdrawn.
7. Remove circlip (D24). Eccentric (D23) can now
be removed by inserting M10 bolt in tapped hole
provided and tapping to loosen in an anti-
clockwise direction (eccentric has a right hand
thread). See Section 0. Next, spacer (D19) can
be slipped off drive shaft (D17) and inspected.
8. 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.
0015908000).
9. To rebuild mechanism, ensure thread and abutting
spacer (D19) is thoroughly clean and simply screw
on the eccentric, making sure it abuts against the
spacer (D19) which in turn abuts shaft (D17)
shoulder.
10. Position connecting rod (D26) on eccentric,
thoroughly de-grease tapping in drive rod (D37)
and assemble drive rod and fulcrum pin (D28) in
connecting rod.
11. Assemble lock nut (D38) to new screw (D27)
locating groove in fulcrum pin (D28). Do NOT re-
use old component. Fully tighten unit against
recess in drive rod(s) (D37) to 2.9kgf m (21lb ft)
torque.
12. Replace flushing chamber and pump on chassis in
accordance with Section 5.4.1 Flushing Chamber
(D33) Instructions 11 to 17 inclusive.
NOTE: It will be necessary to start at 0 5.4.1 Flushing
Chamber (D33) Instruction 10, if lip seals (D30) have
to be replaced.
13. Read Section 0 5.3.2 Mechanical Seal (C08)
Instruction 7 and carefully remove any foreign
matter from the sleeve and mechanical seal
components. Smear clean oil on both the ‘O’ ring
(C07) and the drive shaft diameters. Position the
‘O’ ring on the shaft taking care to prevent it
contacting the drive shaft's keyway, and slide the
sleeve/seal assembly onto shaft (carbon face
towards stationary seat) and press into working
position using only the sleeve's flange. Ensure
that ‘O’ ring is correctly trapped in sleeve recess.
14. Replace impeller, suction tube and separator
components in accordance with Section 0
Impeller (C04) Instructions 8 to 13, inclusively.
11. Replace bearing/seal housing assembly and
actuator neck seal in accordance with Section
7 Before replacing bearing/seal housing
assembly, check condition of drive rod,
particularly if new bush (A28) has been fitted.
If surface is significantly worn, the drive rod
should be replaced in accordance with
instructions given in Section 0.2.
12. Assembly tool (Part No. 0015101000) must be
used when replacing bearing/ seal housing
assembly to ensure that the wiping edges of
the seal assembly (A25) are not damaged.
The drive rod must be smeared with clean oil
to assist this procedure. See Section 6.5.
Gasket (A27) must be renewed, always use a
component supplied by Selwood Pumps.
Ensure that ports in housing (A24) are in the 3
and 9 o'clock positions.
13. Reassemble remaining pump components in
accordance with Section 5.1.4 instruction.
15. Replace drain plug (D13) together with sealing
washer (D14) and refill bearing housing (D06) with
clean oil to level of plug (D08) and replace plug
together with ‘O’ ring (D07). Refer to Section 3.1
Pump Lubrication for details of the oil required for
the Bearing Housing.Replace drain plug (D34)
using PTFE tape as sealant and fill flushing
chamber with new oil to level of plug (D08).
Replace plug and ‘O’ ring (D07). Refer to Section
3.1 Pump Lubrication for details of the oil required
for the flushing chamber.
16. Repeat this procedure for bearing housing
ensuring that level plug (D08) and ‘O’ ring (D07)
are replaced after the correct oil level is attained.
5.4.3 Bearings and Lip Seal
(D15,D18,D04)
In the unlikely event of a bearing failure, or if the
bearing housing oil escapes from the motor end of the
bearing housing by passing across lip seal (D04), it
becomes necessary to undertake work on the drive
shaft assembly.
1. To replace lip seal (D04) only proceed as follows:
a) Remove oil from bearing housing by removing
the filler cap (D08) and drain plug (D13).
b) Remove lip seal carrier (D03) lip seal (D04)
and ‘O’ ring (D05) by removing cap screws
(D01) and washers (A06).
c) Prise out the old lip seal and press in a new
seal. When fitting lightly lubricate the lips of
the seal and if damaged replace ‘O’ ring
(D05).
d) Refit the components taking care not to
damage the lip seal on the sharp edges of the
keyway.
e) Replace drain plug (D13) and sealing washer
(D14) in bearing housing (D06). Fill with oil to
correct level and replace level plug (D08) and
O-ring (D07).
2. For bearing replacement proceed as follows:
a) Carry out Section 0 5.4.2 Air Pump
Mechanism Instructions 1 to 8, inclusively.
b) Remove lipseal carrier (D03) lipseal (D04)
and ‘O’ ring (D05) by removing capscrews
(D01) and washers (A06). If lipseal (D04) is
to be utilised again ensure seal is not dragged
over sharp edge of keyway.
c) Moving to the impeller end of the bearing
housing (D06) remove bearing carrier (D20)
by removing setscrews (D22) and washers
(A13). The bearing carrier (D20) can be
jacked free by the two screwed holes
adjacent to the fixings.
d) Remove drive shaft (D17) complete with
bearings (D18) and (D15) from bearing
housing (D06) by applying pressure

Selwood Seltorque S100 Manual
14
(preferably with a fly-press) to the protected
coupling end of the drive shaft.
e) Press bearings (D15) and (D18) from shaft
(D17) and discard. Thoroughly clean all
bearing housing surfaces and inspect shaft
(D17) for damage.
f) To fit new bearings, thoroughly clean all drive
shaft surfaces and smear oil on bearing
mounting diameters. Press new bearings
onto shaft using workshop tools and method
described Sections 0 and 0, taking care to
ensure that:
i) The bearings are kept in their as-
received condition and do NOT come
into contact with foreign matter.
ii) Pressure during fitting is applied directly
to the inner rings of the bearings and not
to the outer rings.
iii) The bearings are square to the shaft
throughout the fitting procedure.
iv) When fitted, the bearings register
against the shaft shoulders.
NOTE: Use of the workshop tools will ensure the
above criteria is fulfilled.
g) Before replacing the drive shaft sub-assembly
into the bearing housing, make sure that the
bores that receive the bearings are clean and
smeared with clean engine oil. Care must be
exercised when passing the drive shaft with
bearings into the bearing housing to ensure it
is concentric and parallel to the mating
surfaces. This is described in Section 0.
h) The sub-assembly should be pressed into
position by 'jacking' home the bearing carrier
(D20) by means of the setscrews (D22) - do
not apply shock loads such as hammer blows.
NOTE: 'Jack' home evenly - protect surface of bearing
carrier (D20) with plain washers under setscrews (D22)
finally remove setscrews (D22) and fit new washers
(A13).
i) The remaining components may now be
reassembled in accordance with Section 0
5.4.2 Air Pump Mechanism Instructions 9 and
18, inclusively.
6 WORKSHOP TOOLS
Major Servicing will always be carried-out more quickly
by the use of the following special tools and procedure.
More importantly, their use will help to ensure that new
components are not damaged whilst being fitted.
The tools are simple to employ and have been
designed for use in combination with standard fitter's
tools. For some operations, a simple press, and a
bench complete with a vice will be desirable.
We earnestly advise all pump users to purchase a
complete set of tools.
6.1 Care of Servicing Tools
Always clean, oil and safely store tools after use.
Complete sets of tools are available by quoting:Part
No. 0010948200 - Seltorque S100 (Excludes Impeller
Removal Tool Part No. 0015WRS781) Comprising:-
Drive End Bearing
Assembly Tool
0015181100 1
Bearing Assembly Stud 0015172100 1
Eccentric Puller Block 0015170000 1
Impeller End Bearing
Assy Tube
0015169200 1
Drive Rod Bearing Drift 0015168000 1
Mechanical Seal Seat
Removal Tool
0015166000 1
Flushing Chamber Lip
Seal Fitting Tool
0015165100 1
Drive Rod Seal Tool 0010103000 1
Actuator Neck Seal Cone 0015102000 1
Drive Rod Installation
Tool
0015101000 1

Selwood Seltorque S100 Manual
15
6.2 Fitting of Actuator Neck
Seal
1. Lightly clamp seal installation tool against end of
drive rod by means of capscrew, as shown.
2. Push seal into rear of inner pump body recess
Part No. 0015014000.
3. Clean exposed shaft and tool surfaces, and smear
with soft soap. Carefully slide the actuator neck
seal onto shaft until it abuts against the conical
shoulder.
6.3 Removal of Mechanical
Seal Stationary Seat and Joint
Ring
1. Ensure oil is drained from flushing chamber.
Remove impeller and shaft sleeve, complete with
rotating mechanical seal components.
2. Engage tip of removal tool on inside face of seat.
Remove seat by pulling evenly at several
peripheral points.
3. Joint ring can then be collapsed and discarded.
4. To replace, the mechanical seal stationary seat
and joint ring must be assembled together with the
outer face of the joint ring smeared with soft soap,
offered up to the flushing chamber housing and
gently pressed home using a piece of wood.
6.4Removal of Drive Rod Seal
Assembly
1. Remove internal circlip with suitable pliers and
remove seal assembly by carefully tapping with
blunt punch or drift from bush end.
2. Replacement of all components may be aided by
smearing adjacent surfaces with soft soap.
3. Prior to sliding home the drive rod seal carrier Part
No. 0015195000, wiper seal Part No. 9140035070
must first be assembled together, using insertion
tool Part No. 0010103000. Carefully applied
pressure from a hand press or vice jaws may be
employed for this operation.
IMPORTANT ADVICE
Parts must be assembled in correct
order and orientation.
4. Great care must be exercised when replacing the
circlip to ensure that the lip of the wiper seal is not
damaged by the hand tools used.
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.

Selwood Seltorque S100 Manual
16
6.5 Fit Seal Housing Sub-
Assembly to Pump
1. Thoroughly clean exposed drive rod surfaces and
position installation tool as shown. Smear tool
and drive rod surfaces with oil.
2. Thoroughly lubricate drive rod bearing and drive
rod seal with oil and fit new gasket before pushing
seal housing assembly along drive rod until it
registers
i
.
6.6 .Support Remove Drive
Rod Bearing Bush
1. Insert shouldered end of drift into bush as shown
in upper sketch.
2. air pump pedestal evenly on face 'X' leaving
sufficient clearance for bush to emerge freely.
3. Push out bearing bush by pressing or striking on
tool face 'Y'.
6.7.Fit New Bearing Bush
1. Position seal housing on clean flat surface and
register new bush in bore as shown in lower
drawing.
2. Lightly oil bore and bush to prevent pick up.
3. Insert shouldered end of drift into bush as shown
in lower sketch.
4. Insert bush by pressing or striking on tool face 'Y'
until end of bearing is flush with face 'X'.

Selwood Seltorque S100 Manual
17
6.8.Assemble Flushing
Chamber
1. Check that circlip has been fitted to eccentric, and
thoroughly clean exposed shaft surfaces and
smear with oil. Check that lip seal fitting tool is
internally and externally clean, smear with oil and
slide over end of drive shaft as shown.
2. Check that flushing chamber lip seals are correctly
orientated and generously lubricate their lips with
oil. Slide chamber along fitting tool and onto drive
shaft, taking great care to ensure that it remains
concentric to the shafts axis. LIP SEALS MUST
NOT BE USED TO SUPPORT THE FLUSHING
CHAMBER. Ensure that the lip of the leading seal
does not become deformed.
6.9.Remove Eccentric
1. Check that circlip adjacent to eccentric is
removed.
2. Insert M10 bolt plus washer into eccentric as
shown.
3. To release tap using drift in anticlockwise direction
i.e. in direction of arrow 'B'.
NOTE: If removing eccentric when shaft is
disassembled from pump, clamp with soft jaws on
diameter 'Z'.
6.10.Remove Impeller
1. Pump should be removed from the chassis or the
engine decoupled and the bearing housing
supported.
2. Remove suction tube together with separator
components ensuring that the gasket between
pump body and suction tube is also removed.
3. Remove impeller screw and washers.
4. Remove nuts and washer (8off each) from the
studs protruding from the pump body through the
flushing chamber and bearing housing flange joint.
5. Offer up impeller removal tool across front face of
pump body as shown ensuring the correct nose
adaptor is fitted. Affix by using existing nuts and
washers.
6. Turn screw handle so that the drive shaft
connected to the bearing housing is pushed
through and out of the pump body leaving the
impeller free.
NOTE: When re-assembling impeller ensure end of
shaft is coated with Shell ENSIS grease or approved
equivalent.

Selwood Seltorque S100 Manual
18
6.11.Fit Replacement Drive
End Bearing
1. Remove old bearing taking care not to damage
the shaft in any way. Fit soft jaws to vice and
clamp shaft horizontally on diameter 'Z' leaving the
abutment shoulder overhanging.
2. Screw assembly stud Part No. 0015172100 into
shaft end until it bottoms. Thoroughly clean
bearing -mounting surfaces of shaft and smear
with oil.
3. Carefully register bearing on shaft, ensuring that it
is not contaminated by foreign matter, and position
assembly tool Part No. 00151811000 and puller
block Part No. 0015170000 as shown.
4. Ensuring that the bearing is square to the shaft
and that assembly tool is concentric to the shaft's
centre line, push bearing onto shaft by applying
steady and continuous screwing torque to the M16
nut and washer.
5. Check that inner ring of bearing is touching
abutment shoulder of drive shaft:
NOTE: Bearings may be replaced by using the
assembly tool in conjunction with a press only, thus
eliminating stud and puller block.
6.12.Fit Replacement Impeller
End Bearing
1. Remove old bearing taking care not to damage
the shaft in any way. Fit soft jaws to vice and
clamp shaft horizontally on diameter 'Z' leaving the
abutment shoulder overhanging.
2. Screw assembly stud Part No. 0015172100 into
shaft end until it bottoms. Thoroughly clean
bearing mounting surfaces of shaft and smear with
oil.
3. Carefully register bearing on shaft ensuring that it
is not contaminated by foreign matter and
position assembly tool Part No. 0015169200 and
Part No. 0015181100 as shown.
4. Ensuring that the bearing is square to the shaft
and that assembly tool is concentric to the shaft
centre line, push bearing onto shaft by applying
steady and continuous screwing torque to the M16
nut and washer.
5. Check that inner ring of bearing is touching
abutment shoulder of drive shaft.
6. Replace the bearing spacer and circlip.
NOTE: Bearings may be replaced by using the
assembly tools in conjunction with a press only, thus
eliminating stud and puller block.

Selwood Seltorque S100 Manual
19
6.13.Assembly of Drive Shaft
with Bearings into Housing
1. Remove assembly by releasing the 4 x M10
fixings. The bearing carrier can be jacked free by
the two screwed holes adjacent to the fixings.
2. Remove the lip seal carrier, ensuring seal is not
dragged over sharp edge of keyway, together with
'O' ring and press or strike (with soft faced mallet)
shaft end 'Y', to withdraw bearings and bearing
carrier.
3. When assembling, all parts should be
scrupulously clean and bearing mounting surfaces
smeared with oil.
4. The outer race of the drive end bearing is inserted
by carefully drifting or pressing the race into the
housing. Alternatively, the Lip Seal Carrier Part
5. No. 0010200000 may be utilised, pressing the
race into the housing by making use of longer
bolts and jacking home evenly. If this latter
method is employed be sure to use large washers
beneath the bolt head to distribute pressure over a
larger area as the lipseal carrier may be
manufactured in light alloy.
6. Position bearing housing in vertical attitude with
bell end upwards mounted on suitable supports so
that end of shaft can emerge through bottom.
7. Ensure shaft with bearings is inserted into the
bearing housing so that it is concentric and
parallel to the mating surfaces. Assembly is
'jacked' home by tightening the M10 fixings
assembled together with the bearing carrier.
8. Finally ensure lip seal is in good condition together
with 'O' ring before finally bolting up the carrier.

Selwood Seltorque S100 Manual
20
7.FAULT FINDING GUIDE
This table gives the most common symptoms arising in connection with water-handling duties. Please consult
Selwood Pumps 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 contains contaminated oil. Very small
volumes of oil may be lost from these chambers during a day's 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.
PUMP WILL NOT PRIME, OR LOSES PRIME HAVING PUMPED PRODUCT FOR A BRIEF PERIOD OF TIME
ACTION COMMENT
1 Check that drain taps fitted to volute and air
pumps are closed.
Drain taps are sometimes left open overnight. If okay,
try Action 2.
2 Remove inspection cover and check that
delivery valve is seating efficiently.
The delivery line MUST BE DRAINED before the cover
is removed. If okay, try Action 3.
3 Disconnect hose from air pump spigot and
attach vacuum gauge to pump - should read 29'
H20 (25.6" Hg) or more, after the pump is
stopped.
If vacuum is okay, check Action 4.
If vacuum is low or fails quickly, check Action 8.
4 Reconnect air pump hose, and check vacuum at
suction spigot of main pump. Correct reading is
given above.
If vacuum is okay, check Actions 5 (a) and (b).
If vacuum is slow to rise or low at terminal condition,
check Actions 6 and 7.
5 (a) Check all suction-side hoses, fittings and
joints for air leaks.
Priming problems are VERY often caused by faults in
supply pipework. Air must not be allowed to pass into
the system across couplings, etc.
(b) Check strainer and suction hose for
blockages.
Do not use non-reinforced hose. Always fit a strainer of
correct size and type.
6 Examine separator assembly for air leaks or
trapped solids. Check peel valve seat for ice in
cold conditions.
Refer to Major Servicing: Section 0 for advice. The
float must be able to rise and fall freely. The peel valve
must completely shut-off the air pump when the float
rises to its maximum position.
7 Check level of oil in flushing chamber. If level is very low, mechanical seal may be admitting
air.Top up, and re-check vacuum.Substantial oil loss
indicates seal failure - refer to Major Servicing: Section
0 for advice.
8 Examine valves and flexing seals in air pump
assembly and check that castings are not
cracked.
Refer to Major Servicing: Section 5.1 for advice.
OUTPUT AND HEAD ARE LESS THAN PUBLISHED FIGURES
ACTION COMMENT
1 Check strainer and suction pipework for
blockages. Also check that air is not being
pulled through a vortex created in the supply
reservoir.
Choking of the supply system by solids will increase the
flow resistance, thus increasing the head against which
the pump has to operate, and so reducing output, The
entry of air through faulty pipe joints will have a similar
effect. Reduction also occurs if air is entrained through
a vortex to eliminate, increase strainer's submergence.
2 Check pump speed with tachometer. Speed, off-load must not exceed: 1600rpm.
3 Check that delivery valve, discharge branch of
casing, and pipework are free from blockages.
Obstructions down-stream of the pump will increase the
flow resistance and thus reduce output.
4 Check condition of impeller. Excessively worn vanes will reduce output. Also check
outside diameter of vanes:
Standard Seltorque S100 - 215mm