41 - 2
Dismantling and Assembly
Before dismantling/assembling make sure that the exterior
surfaces of the unit and the working area are spotlessly
clean.
Dismantling
1 Make relative location marks on pump body 23,
mounting flange 12 and cover 8 to ensure their correct
positioning during assembly.
2 Dismantle in the numerical order shown on the
illustration opposite, bearing in mind the following
points:
a DO NOT prise apart any machined faces. Always
use a soft faced hammer to avoid damaging the
surfaces.
b Mark bushes 18, 19, 21 and 22 on a plain area
away from the seals so that they are returned to
their original location during assembly.
c Remove drive shaft 17 with bushes 18 and 19 as
an assembly, and gear 20 with bushes 21 and 22
as an assembly.
d Discard all seals.
Inspection
1 Generally check all pump parts for damage and/or
wear. Renew the pump if:
a There is more than minor damage to the grooves in
pump body 23 where 'O' rings 9 and 13 locate.
b The recess for seal 16 in mounting flange 12 is
scored.
c There is a noticeable wear groove on shaft 17
where the lips of seal 16 runs.
d The track cut by the gear in the inlet side of pump
body 23 is deeper than 0.08 mm (0.003 in) or has a
scored matt finish.
e The side faces of gears 17 and 20 and/or the inner
faces of bushes 18,19, 21, 22 are scored.
f The bores A of bushes 18,19, 21, 22 are worn to
the extent that the bronze backing is visible
through the grey P.T.F.E. coating.
2 Remove any burrs and sharp edges from the shaft of
gear 17 to avoid causing damage to seal 16 on
assembly.
Assembling
Wash all components and apply hydraulic oil immediately to
prevent corrosion.
Renew all seals and 'O' rings. Lubricate using JCB Special
Hydraulic Fluid.
For ease of assembly proceed as follows:
1 Fit bushes 21 and 22 into the undowelled end of pump
body 23, making sure the grooves for seals 10 and 11
face outwards.
2 Locate cover 8 against pump body 23. Stand the
assembled components on the cover, i.e. with the
pump body dowels uppermost.
3 Fit drive shaft 17 and gear 20 in their original positions
in the pump body, followed by bushes 18 and 19 with
their seal grooves outwards. Fit new seals 14 and 15.
4 Fit a new 'O' ring 13 into the groove in pump body 23.
Fit a new shaft seal 16, garter spring facing into the
flange, followed by circlip 5. Coat the lips of the seal
with high melting point grease.
5 Carefully refit mounting flange 12, ensuring a square fit
on the pump body dowels.
6 Turn over the assembly and support it on the mounting
flange, making sure there is no weight placed on the
drive shaft.
7 Lift off cover 8. Fit new seals 10 and 11 and a new 'O'
ring 9 to pump body 23.
8 Replace the valve cover and install the bolts 6 with their
spring washers 7. Progressively and evenly torque
tighten the bolts.
9 Pour a small amount of clean hydraulic fluid into port B
and check that the drive shaft rotates without undue
force.
10 If the check at step 9 is satisfactory, fit items 4, 3, 2 and
1. Use a new key 4.
Torque Setting
Item Nm kgf m lbf ft
1 88-102 9-14 65-75
Section E Hydraulics
9803/7130
Section E
41 - 2
Issue 1
Auxiliary Pump
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