40 - 1
Powershift Gearbox
Introduction
The fault finding procedures are given in the form of flow
charts. There are a number of charts, each one dedicated to
a particular fault. The charts are designed to identify
possible causes by performing checks and where
applicable, specific tests on the gearbox. Having identified a
cause the suggested remedy is given. The charts are
designed to identify causes through a process of elimination,
starting with the simplest, most easily rectified faults.
Gearbox faults may be caused by faulty electrical
connectors or components as indicated in the fault finding
charts. Full explanations of the relevant electrical systems
for both 4 speed and 6 speed (Shiftmaster) gearboxes are
given in Electrical Connections.
Due to the time and effort involved in removing, dismantling,
assembling and replacing a gearbox, it is recommended that
fault finding procedures are carried out until a fault can be
identified with a good degree of certainty.
Full details of the test procedures referred to in the charts
are given in Service Procedures, Powershift Gearbox.
Fault Finding Charts:
Chart A - Machine drives but lacks power in all gears.
Gearbox oil may also be overheating.
Chart B - Machine does not drive in any gear.
Chart C - Some gears fail to engage or lack power. 4WD
fails to engage.
Chart D - (6 speed gearbox only) Shiftmaster fails to
function normally - fails to autoshift - shifts at
incorrect road speed.
Note: 4th, 5th and 6th gears utilise clutches used for 1st,
2nd and 3rd gears. If 4th, 5th or 6th gears fail to engage,
check that the lower 3 gears function correctly before
investigating a possible Shiftmaster fault. See Fault Finding
Chart C.
Chart E - Gearbox oil overheats
Chart F - External oil leakage
Chart G- Noisy operation
Further Fault Finding Information
Gearbox Oil Contaminated with Water
Section F Transmission
9803/3280
Section F
40 - 1
Issue 2*
Fault Finding
*
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