40 -
4
S
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9803/
3280
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40 -
4
Issue
1
F
a
ult
F
ind
ing
YES
NO
YES
NO
NO
YES
YES
START
Carry out Individual Clutch Pressure
Tests. Are the relevant clutch
pressures correct?
Are the gear selection column/4WD
switches working correctly. See
Powershift Electrical System Tests.
Clutch Leakage: Remove and
dismantle gearbox. Check condition
of clutch piston seals, ball valves and
housings. Check shaft sealing rings
for wear or damage.
Clear debris from ports. Replace valve
manifold. If fault is cleared, flush
gearbox oil. See Flushing the Gearbox
Oil.
Clutch failure, jammed pistons or
blocked oil ways: Remove and
dismantle gearbox. Clear oilways,
renew clutches as applicable.
Renew applicable switch or repair
wiring as applicable.
Are the solenoids or associated
wiring faulty.
Clean connectors and fit securely.
6 Speed - Is the gearbox ECU connected
correctly?
4 Speed - Are the Powershift relays
connected correctly?
YES
NO
6 Speed - Renew the ECU.
4 Speed - Renew the relays as
applicable.
NO
NO
YES
Renew applicable solenoid or repair
wiring as applicable.
Are the oilways clear at the control
valve manifold and casing? -
Remove the manifold and check. See
Removing the Control Valves.
Are the relevant the clutch solenoids
working? Identify the applicable
solenoids and check for correct
resistance and wiring continuity.
A396300
Powershift Gearbox
Chart C - Some gears fail to engage or lack power. 4WD fails to engage.
