Chart C - Some Gears Fail To Engage Or Lack Power. 4Wd Fails To Engage - jcb 214e Service Manual

Powershift Gearbox

Chart C - Some gears fail to engage or lack power. 4WD fails to engage.

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