TRANSMISSION AND TORQUE CONVERTER 5540F/YB5515 SERVICE MANUAL
7-20 Published 10-21-2010, Control# 198-04
Water Contamination
Troubleshooting
Carefully inspect the gearbox oil for signs of water
contamination. Contaminated oil will contain water droplets
or be visibly emulsified. Water droplets may be visible on the
dipstick or inside the filler tube. For oil analysis purposes, the
maximum permissible water content of the oil is 0.10%.
If the transmission oil has been contaminated with water,
faults or damage to the gearbox may be apparent as a result.
Before remedying, thoroughly investigate and rectify the
cause of the water contamination.
Gearbox faults caused typically by water contamination and
other factors related to the transmission oil:
If the transmission cooler circuit becomes contaminated due
to the ingress of water, stop the engine immediately. Drain
the oil from the transmission sump and external cooler circuit
into a suitable container.
11. Non-return valve faulty. 11. Check the non-return valve
12. 2/4WD solenoid permanently energized 12. Check the 2/4WD relay and select switch, replace as
necessary.
Possible Cause Remedy
Possible Cause Remedy
1. Water ingress during filling/topping up. Carry out flushing procedure. Refill with the
recommended grade of oil.
2. Missing/incorrect dipstick, damaged filler tube. Renew missing/incorrect/damaged components. Carry
out flushing procedure. Refill with the recommended
grade of oil.
3. Machine operated in deep water. Carry out flushing procedure. Refill with the
recommended grade of oil.
4. Gearbox casings damaged. Inspect, renew damaged components. Carry out flushing
procedure. Refill with the recommended grade of oil.
5. Gearbox oil circuit pipes/hoses damaged. Inspect, renew damaged components. Carry out flushing
procedure. Refill with the recommended grade of oil.
6. Oil cooler failure. (Water cooled machine installations). Inspect, renew damaged components. Carry out cooler
test procedure. Carry out flushing procedure. Refill with
the recommended grade of oil.
Fault Possible Cause Remedy
1. Pressurization of gearbox casing -
Dipstick blows out/oil leaking from
dipstick tube.
Water in oil combined with heat from
torque converter causes steam.
Gearbox over filled with oil.
Replace/renew dipstick. Carry out
flushing procedure. Refill with the
recommended grade of oil. Drain the
oil level to the correct level, see
Check Oil Level, Section 3.
2. Clutch Failure - Friction Lining
Separation
Water ingress. Overheating.
Renew friction plates. Carry out
flushing procedure. Refill with the
recommended grade of oil.See Fault
Finding - Synchro Shuttle Gearbox
- Hydraulics.
3. Badly worn/noisy bearings.
Water ingress.
Insufficient lubrication.
Fit new bearings.
Carry out flushing procedure.
Refill with the recommended grade of
oil.
Reference Only
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