N ot e :
The Dism ant ling , Insp ec t io n and Assem b ly
procedures in this manual illustrate and describe the 6x4
gearbox. Procedures for the 4x4 version of the gearbox are
indentical in most respects. Where there are differences
procedures are identified under the heading ‘
4x4 Gearbox
’.
With the gearbox removed from the machine, place suitable
wooden blocks to securely support the assembly.
Cleanliness is of the utmost importance when servicing the
gearbox. All precautions to prevent any ingress of dirt, grit
etc. must be taken. To this end wash the exterior of the
gearbox assembly as follows;
Make sure that all open ports and orifices are effectively
plugged. Remove any deposits of dirt, grit and oil from the
outer casings using a suitable degreaser and water. Dry the
casings.
1
Remove the Main Hydraulic Pump and Driveshaft
a
If t he main hyd raulic p ump has not alread y b een
removed proceed as follows. Support the pump, undo
the 2 bolts
1a
. Draw the pump away from the gearbox,
disengaging the drive shaft. Lift the pump clear.
b
Rem o ve t he c irc lip
1b
f o llo w ed b y b earing
1c
.
Withdraw the driveshaft
1d
. Remove the sealing ring
1e
.
2
Remove the Solenoid Control Valve Block
a
Undo the 8 socket head cap screws
2a
and lift off the
valve block assembly
2b
. Do not use a screwdriver to
lever the block, the sealing faces will be damaged. If
the block is difficult to remove, lightly tap the manifold
block with a soft faced hammer.
Note:
Some gearboxes are fitted with a valve block sub-
base plate. Be sure to retrieve the plate. The plate is thin,
make sure it is not damaged when removing. Take care not
to damage the surfaces of the plate.
b
Remove and discard the valve block sealing gasket.
The gasket may disintegrate on removal, make sure all
traces are removed and discarded. Gearboxes fitted
with a sub-base plate have two gaskets, one each side
of the plate.
3
Remove the Layshaft Cover
Note:
Unless the casings are to be renewed, or the gearbox
oil has been contaminated it is not necessary to remove the
cover.
a
Undo the 6 bolts
3a
and lift off the cover
3b
.
125 - 2
Section F
9803/3280
Section F
125 - 2
Issue 1
Powershift Gearbox
Dismantling
