Section E - Hydraulics
Loader Pump
Dismantling, Inspection and Assembly
E-22 E-22
9803-9570-4
Dismantling, Inspection and Assembly
Dismantling
For assembly the sequence should be reversed.
The numerical sequence shown on the illustration is
intended as a guide to dismantling.
Note: Before starting, lightly mark the pump sections,
flange and end cover to ensure correct alignment on re-
assembly.
1 Use a soft-faced hammer to separate the pump
sections but do not hammer the coupling off the shaft
as this will result in internal damage. Do not use
levers of any kind to separate pump components.
2 Bushes 12 - 15, 29 - 32 and 46 - 49 must be marked
to denote their location within the body. Do not
dismantle sub-assemblies A, B or C until this has
been done.
Note: The bushes are split into two halves, e.g. items 12
and 13. Each half must be individually marked to ensure
correct re-assembly.
3 Remove bushes, gears and seals, keeping
components of each section of the pump together in
their relative positions.
Inspection
1 Bodies 18, 35 and 52 can only be re-used if the 'cut-
in' (where the gears wipe into the body) is bright and
polished in appearance and the depth does not
exceed 0.076 mm (0.003 in.)
2 Ensure that the end cover, spacer plates and flange
are free from damage which could result in oil leakage
in the region of the seal contact faces.
3 If the shaft seal bore is worn, JCB Threadlocker and
Sealer should be applied to the outside diameter of
the seal.
4 The bushes must be perfectly flat on the faces which
contact the gear side faces. The bearing bores must
be free from scoring or other damage. The outside of
the bushes should not show any prominent signs of
wear.
5 Gear side faces, teeth and journals must be free from
scoring, wear steps, bruising or pitting.
Assembly
1 Renew all seals and 'O' rings.
2 If refitting used components, ensure that they are
fitted in their original positions.
3 Fit seal 55 with its spring inwards.
4 Tighten screw 4 to the torque settings given below.
Table 2. Torque Settings
5 After assembly, pour a small amount of hydraulic oil
into each outlet port and check that the shaft can be
rotated without undue force, using a smooth jawed
hand wrench hooked around the shaft or a suitable
half coupling locked against the key.
Item Nm kgf m lbf ft
1 24 2.5 17.7
4 24.5 - 27 2.5 - 2.7 18 - 20
D 48 4.9 35.4
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