TM 9-2320-363-34-1
Table 2-1. Troubleshooting (Cont)
Malfunction
Test or inspection
Corrective Action
TRANSMISSION (CONT)
Step 2. Check for lockup pressure at idle speed. Remove pressure switch at
transmission lockup port and install tee and 0 to 300 psi (0 to 2070 kPa)
gage. Start engine and allow to run at idle speed. With parking brake
applied, shift transmission into DRIVE. Check for 0 psi (0 kPa) lockup
pressure. There should be no lockup pressure.
If there is any lockup pressure, inspect lockup clutch valve for
sticking pistons (page 3-262).
If there is no lockup pressure, disassemble transmission (page
14-1 ) and check for warped clutch plates, stuck (applied) clutch
pack pistons, or damaged torque converter to turbine support
bearing.
6. AUTOMATIC SHIFTS OCCUR AT TOO HIGH A SPEED.
Step 1. Check for low rear governor pressure. Remove plug from rear governor test
port. install 0 to 200 psi (0 to 1380 kPa) gage at rear governor test port.
Start engine and shift transmission into DRIVE. Release parking brake and
drive vehicle until engine tachometer reads approximately 1650 rpm. Check
for 100 to 115 psi (690 to 794 kPa) rear governor pressure.
If pressure is below 100 psi (690 kPa), repair valve body
(page 14-74).
2-14
