TM-5-3805-254-34
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
MARCH 1993
TM-5-3805-254-34 - Page 28 of 727
TM 5-3805-254-34
Table 2-1.
Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
23.
TRANSMISSION SHIFTS WHEN SPEED OF VEHICLE IS TOO LOW.
Step 1.
Inspect for defective transmission modulator valve in transmission control valve (see paragraph 6-
14).
Repair transmission modulator valve in transmission control valve (see paragraph 6-34).
Step 2.
Inspect for defective shift signal valve In transmission control valve (see paragraph 6-14).
Repair transmission shift signal valve in transmission control valve (see paragraph 6-34).
Step 3.
Inspect for defective transmission governor assembly (see paragraph 6-35).
Replace transmission governor assembly (see paragraph 6-35).
24. TRANSMISSION SHIFTS WHEN SPEED OF VEHICLE IS TOO HIGH.
Step 1.
Inspect for defective transmission governor assembly (see paragraph 6-35).
Replace transmission governor assembly (see paragraph 6-35).
Step 2.
Inspect for defective shift signal valve in transmission control valve (see paragraph 6-14).
Repair transmission shift signal valve in transmission control valve (see paragraph 6-34).
25. TRANSMISSION OIL PRESSURE LOW.
Step 1.
Check level of transmission oil (see TM 5-3805-254-10).
Add transmission oil If low (see TM 5-3805-254-20).
Step 2.
Inspect for clogged transmission internal oil filter element (see TM 5-3805-254-20).
Replace oil filter element (see TM 5-3805-254-20).
Step 3.
Inspect seal ring of transmission oil filter element (see TM 5-3805-254-20).
Replace seal ring of transmission oil filter element (see TM 5-3805-254-20).
Step 4.
Inspect for defective transmission oil pump (see paragraph 6-28).
Repair transmission oil pump (see paragraph 6-28).
Step 5.
Inspect for defective transmission control valve (see paragraph 6-14).
Repair transmission control valve (see paragraph 6-34).
26. TRANSMISSION OIL PRESSURE LOW IN ONE GEAR, NORMAL IN OTHER GEARS.
Step 1.
Inspect for defective transmission control valve (see paragraph 6-14).
Repair transmission control valve (see paragraph 6-34).
Step 2.
Inspect for defective seal rings in piston of gear with low pressure.
Repair transmission.
2-9
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