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TM 10-3930-643-34
TRANSMISSION TROUBLESHOOTING AND MAINTENANCE.
6-2.
Transmission Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
d.
LOW CLUTCH PRESSURE.
Step 1.
Check for clogged oil filter or transmission screens.
Clean or replace as necessary, refer to LO 10-3930-643-12.
If filter and screens are operating, proceed to Step 2.
Step 2.
Check for foamed oil.
Tighten, replace or repair any external leaks in gaskets, lines or
fittings.
If no leaks are found, proceed to Step 3.
Step 3.
Improper clutch pressure regulator valve or neutral knock down
valve operation.
Replace control and scheduling valve assembly, refer to paragraph
6-8.
If clutch pressure is still low, proceed to Step 4.
Step 4.
Pressure test while shifting transmission to determine internal
leakage.
Replace transmission if internal leakage is determined,
refer to
paragraph 6-6.
e.
HIGH OR LOW TORQUE CONVERTER “IN” PRESSURE.
Refer to Torque Converter Troubleshooting.
f.
LOSS OF POWER.
Step 1. Check engine, refer to Engine Troubleshooting.
If engine is running properly, proceed to Step 2.
Step 2.
Check torque converter, refer to Torque Converter Trouble-
shooting.
If torque converter is operating, proceed to Step 3.
6-7
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