TM 5-3805-260-24
PROBLEM
PROBABLE CAUSE
RECOMMENDED CORRECTIVE ACTION
Transmission does not shift.
1. Low oil pressure.
a. Check oil pressure, adjust as necessary.
2. Air leaks on inlet side of pump.
a. Repair or replace pump.
3. Control linkage loose or adjustment not correct.
a. Check control linkage for proper adjustment.
Transmission
engages
very
suddenly
(rough
shifting).
1. Primary setting of the relief valve not correct.
a. Correct primary setting of the relief valve.
2. Adjustment of control linkage not correct.
a. Check control linkage for proper adjustment.
3. Operation of load piston or differential and safety
valve not correct.
a.
Repair
or
replace
load
piston/differential/safety
valve
as
necessary.
4. Valve springs are weak or have damage.
a. Replace valve springs.
Shifts slowly.
1. Low oil pressure.
a. Check oil pressure, adjust as needed.
2. Adjustment of control linkage not correct.
a. Check control linkage for proper adjustment.
3. Air leaks on inlet side of pump.
a.
Repair
or
replace
pump.
PROBLEM
PROBABLE CAUSE
RECOMMENDED CORRECTIVE ACTION
4. Operation of load piston or differential and safety
valve not correct.
a. Repair or replace load piston/differential and
safety valve.
5. Orifice in modulation relief valve not open.
a. Repair or replace modulation relief valve.
Transmission engages but the machine does not
move and the engine stops.
1. The gears in the transmission cannot turn.
a. Parking brake is on.
b. Planetary in the final drive has broken gears
and cannot turn.
c. Differential has broken gears and will not turn.
d. Too many transmission clutches are being
engaged in the transmission.
1. Release parking brake.
2. Replace planetary in the final drive.
3. Replace differential.
4. Repair or replace transmission clutches
as necessary.
Loss of power during or after a shift.
1. Two or more clutches wrongly engaged.
a. Repair or replace clutches as necessary.
Pump noise is not normal.
1. Loud sounds at short intervals that give an
indication that particles are going through the pump is
caused by pump cavitation (the sudden making of low
pressure bubbles in a liquid). Cavitation is caused by a
restriction or an air leak in the inlet line to the pump.
a. Repair or replace pump.
2. A constant loud noise is an indication of pump failure.
a. Repair or replace pump.
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