TM 9-2320-289-34
Table 2-1, Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4.
Disconnect vacuum hose from vacuum pump. Install hose and vacuum gage on
vacuum pump. Start engine. Calculate proper vacuum gage reading as shown in
chart. Shut off engine.
If vacuum drops 1 in. Hg or more in less than 1.5 seconds, or if vacuum
never reaches proper gage reading,
replace vacuum pump. (See
TM 9-2320-289-20)
Step 5.
Step 6.
Step 7.
Step 8.
Remove, clean, and inspect vacuum modulator assembly and modulator valve.
(See paragraph 5-3)
Remove and air check direct clutch for leak to outer area of direct clutch
(See paragraph 5-1 7)
Repair direct clutch if it is leaking.
Remove, disassemble, clean,
and inspect transmission oil pump.
piston.
(See
paragraph 5-1 5)
Check for damage to intermediate clutch piston seals, second oil seal ring on
center support, and center support assembly.
Replace any damaged components. (See paragraph 5-1 9)
58. LONG 1-2 SHIFT WITH END BUMP, 1-2 SLIPPAGE, OR EARLY 1-2 SHIFT
Step 1.
Test transmission oil pressure with brakes applied, “ D“ (Drive), engine at
1000 rpm. (See paragraph 5-11)
If oil pressure is normal, perform step 2.
If oil pressure is low, perform step 3.
2-35
