Powershift Gearbox
Gearbox Hydraulic Pump -
Removal and Replacement
The gearbox hydraulic pump is located at the input end of
the gearbox. The gearbox must be removed from the
machine to enable removal and replacement of the pump.
Removal
1 Remove the gearbox from the machine, see Powershift
Gearbox Removal and Replacement.
IMPORTANT NOTE: After removing the gearbox DO NOT
REMOVE THE TORQUE CONVERTER HOUSING 1 from the
gearbox. A simple service tool (A) must be manufactured to
enable the pump assembly to be removed. See
Transmission, Service Tools for details.
2 Undo the 4 fixing bolts 2. Discard the sealing washers
3.
3 Using a set of M10 x 1.5 taps carefully tap the 2 holes
B in the pump assembly 6. Start with the taper tap (be
sure not the damage the tapped holes in the gearbox
front case beneath) and finish with the plug tap. Ensure
that the thread is at least 35 mm (1.38 in) deep and
both the pump body and stator are threaded. Be sure
to remove ALL swarf before proceding.
4 Screw in a 250 mm (10 in) length of M10 threaded rod
C into each hole B. Position the reaction bar A as
shown. Progressively screw down the M10 nuts D to
withdraw the pump assembly from its housing.
5 Remove and discard the pump sealing ring 4. Remove
and discard the ‘O’ ring 5 from the pump locating bore
in the housing 1.
Note: The pump should be dismantled and inspected, see
Powershift Gearbox - Inspection. Note that a pump which
is badly worn or damaged may have caused further damage
to the gearbox, see Powershift Gearbox - Dismantling.
63 - 2
Replacement
1 Fit a new ‘O’ ring 5 to the locating bore inside the
housing 1. Lightly oil the ‘O’ ring.
2 Make sure that the pump is fitted with a new oil seal,
see Powershift Gearbox, Inspection, step 4.
Fit a new sealing ring 4. Locate the pump over the input
shaft aligning the bolt holes. Apply JCB Threadlocker
and Sealer to bolts 2. Fit the bolts together with new
sealing washers 3. Progressively torque tighten the
bolts to 28 Nm (20 lbf ft).
3 Pour some clean, new, oil into the pump at position X.
Section F Transmission
9803/3280
Section F
63 - 2
Issue 1
Service Procedures
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