TRUCK SERVICE MANUAL
STEERING
PREVENTI VE MAINTENANCE
Para 3-196
TROUBLESHOOTING CHART
Cause
Remedy
(A)
AUTOMATIC SHIFTS OCCUR AT TOO HIGH SPEED
1.
Governor valve stuck
1. Clean or replace governor
2.
Shift signal valve spring adjustment too
2. Back off spring adjusting ring (para 6-4)
tight
3.
Valves sticking
3. Overhaul valve body assembly (para 6-4)
(B)AUTOMATIC SHIFTS OCCUR AT TOO LOW SPEED
1.
Governor valve stuck
1. Clean or replace governor
2.
Governor spring weak
2. Replace governor
3.
Shift signal valve spring adjustment too
3. Tighten spring adjusting ring (para 6-4)
loose
4.
Modulator valve stuck
4. Clean or replace modulator valve (para 6-4)
5.
Modulator valve spring adjustment too
5. Tighten spring adjusting ring (para 6-4)
loose
(C)
LOW MAIN PRESSURE IN ALL RANGES
1.
Low oil level
1. Add oil to proper level (para 3-3)
2.
Oil filter element clogged
2. Replace filter
3.
Sealring at oil intake pipe (filter output)
3. Replace sealring
leaking or missing
4.
Main-pressure regulator valve spring
4. Replace spring
weak
5.
Control valve body leakage
5. Replace or rebuild valve body assembly
6.
Valves stuck (trimmers, relays, and
6. Overhaul valve body assembly, main-
main-pressure regulator)
pressure regulator valve
7.
Oil pump, worn or damaged
7. Replace or rebuild oil pump
(D)
LOW MAIN PRESSURE IN ONE OPERATING RANGE, NORMAL IN OTHER RANGES
1.
Leakage in clutch apply circuits for
1. Replace or rebuild valve body assembly
specific range
2.
Excessive leakage at clutch piston seals
2. Overhaul transmission and replace
for specific range
piston seals
(E)
1.
Idle throttle setting too high
1. Adjust throttle setting (refer to ve-
hicle manual)
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