jcb 3CX Service Manual

40 - 3 Section F Transmission 9803/3280
Section F
40 - 3
Issue 1
Fault Finding
YES
NO
NO
NO
YES
NO
YES
YES
NO
NO
NO
NO
Is gearbox oil level low?
START
Are the park brake and transmission
dump switches working correctly?
Is the gear selection column switch
working correctly. See Powershift
Electrical System Tests.
Remove and dismantle gearbox.
Check condition of pump, casings for
internal/external leakage. Check
pump drive dogs on torque converter
are undamaged.
Top up oil level.
NO
Carry out Torque Converter In
Pressure Test
Is torque converter in pressure
correct?
Check condition of torque
converter relief valve.
Clean or renew as applicable.
Renew switch or repair wiring as
applicable.
Renew switch or repair wiring as
applicable.
Renew solenoid or repair wiring as
applicable.
Clean connectors and fit securely.
YES
YES
Are the clutch control solenoids
working? Check control valve
solenoids for correct resistance
and wiring continuity - check
forward and reverse solenoids
first.
YES
Carry out Mainline Oil Pressure Test
Is mainline oil pressure correct?
Carry out Mainline Oil Pressure and
Flow Tests
Is mainline oil pressure /flow correct?
Check condition of pressure
maintenance
valve. Clean or renew as applicable.
Check for signs of excessive external
oil leakage.
6 Speed - Is the gearbox ECU connected
correctly?
4 Speed - Are the Powershift relays
connected correctly?
6 Speed - Renew the ECU.
4 Speed - Renew the relays as
applicable.
A396290
Powershift Gearbox
Chart B - Machine does not drive in any gear.
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jcb 3CX Specifications

General

Brand	jcb
Model	3CX
Category	Compact Loader
Language	English