jcb 217 User Manual

36 - 1
Synchro Shuttle Gearbox - 2/4 Wheel Drive Clutch
4WD CANNOT BE ENGAGED
In normal operation the 2/4 wheel drive clutch is spring loaded off and therefore disengaged to give 2 wheel drive. The clutch
must be pressurised to give 4 wheel drive. Before starting the more detailed fault finding procedures - eliminate the obvious:
1 Check that the transmission oil level is correct.
2 Check that the fuse for the 2/4WD circuit is intact.
3 Check that the 4-wheel drive external pipework is not damaged and that the drive train is intact.
4 Check that all the electrical connections are clean and secure. Also check that the solenoid spool is not sticking (in the
2WD position).
5 Check that the mainline pressure is correct (see 'Low Mainline Pressure').
6 Check that the pump flow rate is correct.
If the fault is not rectified after eliminating the obvious, check the following:
Possible Cause Remedy
7 Low mainline pressure 7 Identify if the fault is related to the 2/4WD
disconnect:
7.1 Disconnect the external pipework to the
2/4WD clutch. Cap and plug open orifices.
7.2 Check the mainline pressure - if the pressure
is correct, the fault must be within the 2/4WD
(see step 8). If the reading is still low check
the transmission in the normal manner.
8 Low mainline pressure (due to 2/4WD clutch): 8 Rectify fault:
8.1 2/4WD solenoid spool sticking. 8.1 Strip, clean and re-assemble solenoid valve,
renew valve if required.
8.2 2/4WD solenoid spool O-ring failed. 8.2 Renew O-ring.
8.3 Clutch shaft sealing rings leaking. 8.3 Renew clutch shaft sealing rings.
8.4 Excessive clutch shaft end float. 8.4 Rectify fault, renew parts as required, reset
end float (should not exceed 0.03 mm; 0.001 in)
8.5 Wrong type clutch piston fitted. 8.5 Fit correct type clutch piston (ie, without bleed
hole).
8.6 Clutch piston O-ring failed. 8.6 Replace clutch piston O-ring.
9 Defective 2/4WD clutch: 9 Rectify fault:
9.1 Worn friction/counter plates 9.1 Inspect friction/counter plates, renew as
required.
9.2 Mechanical failure of 4WD unit 9.2 Strip and inspect 4WD unit. Check that the
electrical and hydraulic circuits are functioning
correctly.
9.3 Incorrect clutch pack end float. 9.3 Measure clutch pack end float (should be 1.0 to
2.3 mm). Correct as required.
Section F Transmission
9803/3280
Section F
36 - 1
Issue 1
Fault Finding
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jcb 217 Specifications

General

Brand	jcb
Model	217
Category	Other
Language	English