90 SECTION 21 - TRANSMISSION
1.12 FAULT FINDING
PROBLEM CAUSE
Transmission fails to drive in
either direction
Low or no pump pressure.
Low or no oil in transmission.
Mechanical failure in transmission.
Worn or broken input shaft seal rings.
Pressure relief solenoid valve faulty.
Direction control solenoid valve inoperative.
Blockage of restricted flow in oil ports.
Transmission drives in one
direction only
Low oil pressure on one clutch pack due to leaks.
Clutch piston seals worn or damaged.
Clutch pack excessively worn.
Direction control solenoid valve or coil faulty.
Mechanical failure in transmission.
Blockage of restricted flow in oil ports.
Worn or broken input shaft seal ring.
Delay in taking up drive Low converter pressure.
Low oil level.
Low clutch pressure.
Faulty modulation in direction control solenoid valve.
Blocked direction control solenoid valve.
Blockage of restricted flow in oil ports.
No drive from 4WD 4WD solenoid valve or coil not operating.
Mechanical failure in transmission.
Low 4WD clutch pack pressure.
Worn 4WD clutch pack.
Transmission overheating Oil level too high or low.
Cooler flow restricted.
Low oil pressure.
Clutch packs slipping due to low pressure or wear.
Mechanical failure in transmission.
Excessive stall operation.
Operating in too high of gear
range for conditions
Shift to lower gear.
Difficult gear selection Forward or reverse travel clutch pack pressurised when not selected.
Direction control solenoid valve faulty.
Input shaft seal rings leaking.
Mechanical failure in transmission.
Forward or reverse travel clutch pack not releasing due to a mechanical
failure.
Vehicle moves with direction
valve in neutral position
See “Difficult gear selection”.
High stall speed Low oil level. Air in oil.
Clutch plates slipping due to low pressure or wear.
Torque converter faulty.
Converter relief valve faulty.
Wrong torque converter installed.
Low stall speed Poor engine performance.
Torque converter faulty.
Wrong torque converter installed.
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