TM 5-3805-260-24PROBLEMPROBABLE CAUSERECOMMENDED CORRECTIVE ACTIONTransmission 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 (roughshifting).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 safetyvalve not correct.a. Repair or replace loadpiston/differential/safety valve asnecessary.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.PROBLEMPROBABLE CAUSERECOMMENDED CORRECTIVE ACTION4. Operation of load piston or differential and safetyvalve not correct.a. Repair or replace load piston/differential andsafety valve.5. Orifice in modulation relief valve not open.a. Repair or replace modulation relief valve.Transmission engages but the machine does notmove 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 gearsand cannot turn.c. Differential has broken gears and will not turn.d. Too many transmission clutches are beingengaged in the transmission.1. Release parking brake.2. Replace planetary in the final drive.3. Replace differential.4. Repair or replace transmission clutchesas 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 anindication that particles are going through the pump iscaused by pump cavitation (the sudden making of lowpressure bubbles in a liquid). Cavitation is caused by arestriction 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.2-103
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