TM 5-3805-260-24TROUBLESHOOTINGUse this as a reference for the location andcorrection of problems in the power train. When morechecking is necessary, use the 5P6225, 7S8875 or8M2736 Hydraulic Test Box.Always make visual checks first. Then check theoperation of the machine and go on to check with theinstruments.VISUAL CHECKSI. Check the oil level in the transmission.2. Check all oil lines, hoses and connections forleaks and damage. Look for oil on the groundunder the machine.3. Move the selector handle to all REVERSE and allFORWARD positions. The detents must be feltin all positions.4. Let the oil out of the filter housing. Remove andcheck the filter element for loose particles. Also,check the magentic strainer.a. Bronze-colored particles give an indication ofclutch failure.b. Shiny steel particles give the indication of aclutch failure.c. Rubber particles give an indication of a sealfailure or hose failure.d. Aluminum particles give an indication of atorque converter failure. If you find metal orrubber particles, all components of thetransmission hydraulic system must bewashed clean. Do not use parts , withdamage. Use new parts.CHECKS DURING OPERATION.With the engine running, move the selector lever toall speed positions. The detents must be felt in allpositions.Operate the machine in each direction and in allspeeds. Make note of all noises that are not normal andfind their sources. If the operation is not correct, makereference to the CHECK LIST DURING OPERATION for"problems, " "probable causes, " and "recommendedaction."CHECK LIST DURING OPERATIONTransmissionPROBLEMPROBABLE CAUSERECOMMENDED CORRECTIVE ACTIONTransmission does not operate in any speed or doesnot engage (slips) in all speeds.1. Low oil pressure.a. Low oil level.b. Control linkages loose or adjustment notcorrect.c. Failure of the oil pump or the pump drive.d. Air leaks on inlet side of pump.e. Leakage inside the transmission.f. Adjustment of the modulation relief valve notcorrect, or valve does not close.g. Load piston or differential and safety valvewill not close.1. Check oil level, adjust as needed.2. Check control linkage for properadjustment.3. Repair or replace oil pump/pump drive.4. Repair or replace pump.5. Repair as necessary to stop leakage.6. Check modulation relief valve for properadjustment. If valve does not close,repair or replace as necessary.7. Repair or replace load piston/differentialand safety valve.2.Mechanical failure in transmission.a. Repair or replace parts as necessary.3. Failure of the torque converter.a. Repair or replace as necessary.4. Failure of the differential or the final driveplanetaries.a. Repair or replace the differential/final driveplanetaries.2-102
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