TCM FD35C9 - 4.3 Drive Unit (Torque Converter Type) Troubleshooting

4-2
4.3 DRIVE UNIT (TORQUE CONVERTER TYPE)
Problem Probable cause Remedy
1. Truck won’t start
when accelerator
pedal is pressed.
Low torque converter oil level Add oil.
Clutch oil pressure is lower than specied See Problem 3.
Damaged parts inside transmission Replace.
2. Poor acceleration
(Truck speed
does not
increase)
Low torque converter oil level Add oil.
Strainer clogged Clean.
Charging pump defective Replace.
Clutch slips because clutch oil pressure is lower than
specied
See Problem 3.
3. Low oil pressure
Charging pump damaged or pump drive unit damaged Replace.
Control valve defective Replace.
Seals damaged Replace.
4. Clutch oil
pressure is too
low
Low torque converter oil level Add oil.
Strainer clogged Clean.
Clutch oil pressure relief valve damaged Replace valve.
5. Oil temperature
is excessively
high
Oil cooler contaminated Clean or replace cooler.
Low torque converter oil level Add oil.
Insufcient quantity of oil circulating through the circuit
due to damaged charging pump or damaged hydraulic
system
Replace.