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TM 10-3930-643-34
TRANSMISSION TROUBLESHOOTING AND MAINTENANCE. (cont)
6-2.
Transmission Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
a. HIGH OIL TEMPERATURE.
Refer to Torque Converter Troubleshooting.
b.
SLOW OR ERRATIC CLUTCH ENGAGEMENT.
Step 1.
Check for clogged oil filter or oil filter screens, refer to
LO 10-3930-643-12.
If transmission continues to shift roughly or erratically,
proceed
to Step 2.
Step 2.
Test for low clutch pressure.
Refer to “low clutch pressure”
in this section.
If clutch pressure is correct, proceed to Step 3.
Step 3.
Check to see if neutral knock down valve or
clutch pressure
regulator valve sticking.
Replace control and scheduling valve assembly, refer to paragraph
6-8.
If shifting is still erratic, proceed to Step 4.
Step 4.
Internal oil leaks.
Shift through all gears to determine if
one or all clutches are malfunctioning.
Replace transmission, refer to paragraph 6-6.
c.
HIGH CLUTCH PRESSURE.
Check for improper main pressure regulator valve operation.
Replace or repair as necessary, refer to paragraph 6-8.
6-6
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