10 - 2
Hydrostatic Pump
Dismantling and Assembly
The information on this page covers the dismantling and
assembly of those 'auxiliary' components which are
accessible without actually splitting the main unit. For each
component the numbering sequence is a guide to
dismantling. The assembly procedure is a reverse of the
dismantling procedure. Use new 'O' rings and lubricate
components with hydraulic fluid on reassembly.
Auxiliary Pump
Remove bolts A and lift the pump away from the main unit.
On reassembly, torque tighten the bolts to 77 Nm (57 lbf ft,
7.9 kgf m).
Trunnion Covers
When removing the trunnion covers 2 remove and retain
shimpacks 3 as a set. (Note that only the rear pump trunnion
cover is shown. The front pump cover is identical, but the
shimpacks should not be mixed.)
On reassembly, lubricate the shimpack 3. Torque tighten
bolts 1 (4 off) to 24 - 30 Nm (18 - 22 lbf ft, 2.5 - 3.0 kgf m).
Shaft Seal
Remove circlip 6 from the housing. Carefully remove the seal
cover 7. (Take care not to damage the shaft or housing.)
Remove the 'O' ring 8 from the seal cover and discard. Press
out the seal 9 from the seal cover 7 using an arbor press and
discard. Check the shaft and seal cover for damage and
wear.
On reassembly, lubricate the new seal 9 with grease and,
using the arbor press, press into the seal cover, ensuring that
the seal lips face outwards.
Note: Wrap the spline of the shaft with tape during assembly.
Note: If a bevelled circlip 6 is used, install the bevelled side
outwards.
Check Valves
Remove the check valves 12 and place on a suitable clean
surface. Inspect the valve and its mating seat in the housing
for damage and foreign material.
On reassembly torque tighten to 41 - 68 Nm (30 - 50 lbf ft, 4 -
7 kgf m).
Separating the Front and Rear Pumps
The front and rear pumps are secured together by four
capscrews 18. On reassembly, ensure that the lifting eye 19
is refitted as shown. See page E/10 - 3 for details of pump 'O'
rings and locating dowels.
Torque tighten screws 18 to 47 - 61 Nm (35 - 45 lbf ft, 4.8 -
6.2 kgf m).
Section E
Hydraulics
9803/8500
Section E
10 - 2
Issue 3*
Pumps
*
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