TM 5-3805-258-24-1
T R O U B L E S H O O T I N G
PROBLEM: Low pressure at pressure taps for P1 (speed)
and P2 (direction) clutches in all speeds and
directions.
PROBABLE CAUSE:
1. Operation of modulation relief valve not correct.
2. Operation of load piston not correct.
PROBLEM: Low pressure at P2 clutch pressure tap in RE-
VERSE speeds.
PROBABLE CAUSE:
1. Too much leakage in the No. 1 clutch.
PROBLEM: Low pressure at P2 clutch pressure tap in
FORWARD speed.
PROBABLE CAUSE:
1. Too much leakage in the No. 2 clutch.
PROBLEM: Transmission stays engaged when the left
brake pedal is pushed.
PROBABLE CAUSE:
1. Failure in transmission neutralizer valve.
PROBLEM: Pump noise not normal.
PROBABLE CAUSE:
1.
2.
3.
Loud sounds at short intervals that give an indi-
cation that particles are going through the pump
is caused by pump cavitation.
A constant loud noise is an indication of pump
failure.
Air at the inlet side of the pump (aeration).
PROBLEM: Transmission selection lever does not stay in
a direction with the engine running and park-
ing brake “OFF”.
PROBABLE CAUSE:
1. Failure in transmission neutralizer group.
2. No air pressure to transmission neutralizer group.
PROBLEM: Back-up alarm does not sound whan selection
lever is put in REVERSE.
PROBABLE CAUSE:
1. Adjustment of direction control linkage not correct.
2. Failure of back-up alarm switch.
3. Failure of back-up alarm.
4. Failure in the wiring of back-up alarm circuit.
T E S T I N G
A N D
A D J U S T I N G
PROBLEM: With the engine running and the parking
brake “ON”, the alarm does not sound when
transmission selection lever is put in a
direction.
PROBABLE CAUSE:
1. Adjustment of direction control linkage not correct.
2. Operation of transmission neutralizer group not
correct.
3. Failure of transmission neutralizer switch.
4. Failure of alarm.
5. Failure in the wiring of the warning system.
PROBLEM: With the engine running and the parking
brake “ON”, the transmission selection lever
does not return to NEUTRAL when put in a
direction.
PROBABLE CAUSE:
1. Failure in transmission neutralizer group.
2. Failure in parking brake system.
Torque Converter
PROBLEM: Torque converter gets hot.
PROBABLE CAUSE:
1.
2.
3.
4.
5.
6.
Low oil level in transfer gear case.
Low water level in engine radiator.
Restrictions in oil cooler or oil lines.
Too much operation of machine at or
speed (overload).
near stall
Too much oil in the converter housing around the
converter because of:
a. Too much oil leakage inside the converter.
b. Ratio valve for the torque converter does not
move (too much inlet oil).
Not enough oil to the converter because of:
a. Ratio valve for the torque converter does not
move (not enough inlet oil).
b. Oil pump failure.
c. Too much leakage in transmission.
PROBLEM: High pressure at converter outlet relief valve tap.
PROBABLE CAUSE:
1. Adjustment of converter outlet relief valve not
correct.
2. Valve spool in outlet relief valve does not move.
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