TROUBLESHOOTING INTRODUCTION - CONTINUED
OPERATIONAL CHECKS (POWERTRAIN) - CONTINUED
N OT E
There is an oil filter bypass valve on inlet side of transmission oil filter. Oil filter bypass will open in
order to allow oil to bypass oil filter element. This happens whenever pressure difference between inlet
oil and outlet oil through oil filter is too high. Any oil that does not flow through filter element flows
directly into hydraulic control circuit. This dirty oil may cause restrictions in valve orifices, sticking
If any of the above particles are found during any visual check, a transmission malfunction exists.
Transmission may need to be replaced.
Drain transmission oil and remove and clean suction screen (WP 0083 00) in order to visually inspect. Inspect oil and
suction screen for foreign material. Use a magnet to separate ferrous particles (iron) from nonferrous particles. Inspect
transmission oil filter for foreign material. Look for:
Rubber particles indicating seal or hose failure.
Shiny steel particles indicating mechanical failure or gear wear of transmission or pump.
A heavy accumulation of fibrous material indicating worn clutch discs in transmission.
Aluminum particles which may indicate these conditions:
Torque converter wear or failure.
Wear on clutch piston.
Iron or steel chips indicating broken components in transmission.
N OT E
Ensure drive shaft and universal joints are free to rotate. If shafts are not free to turn, disconnect shafts (WP 0090 00).
Ensure transmission will turn.
VISUAL INSPECTION OF AIR CONDITIONING SYSTEM
Check for any type of restriction that will obstruct air flow. Check for dirt, insects, plastic bags, etc.
Check for a loose belt on compressor (WP 0046 00).
Check drain tube on evaporator. Drain plug should not be obstructed (WP 0196 00).
Start machine. Set AC on HIGH (TM 5-3805-290-10). Feel accumulator with hand. In a properly charged system, entire
accumulator will be cooled or cold to touch.