RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
AUXILIARY POWER UNIT (APU) TROUBLESHOOTING PROCEDURE
Tools and Special Tools
Auxiliary Power Unit (APU)
Engine fails to crank.
Do steps 1 and 2.
Engine cranks but fails to start.
Do steps 3 thru 5.
Engine hard to start.
Do steps 6 thru 11.
Engine hard to start in cold weather.
Do step 12.
Engine starts but fails to keep running.
Do steps 13 thru 17.
Do step 18.
Engine misfires, lacks power, or emits black smoke. Do steps 19 thru 26.
Do steps 27 thru 32.
Engine uses excessive oil and emits light blue smoky exhaust. Do steps 33 and 34.
High air temperature light on APU control box fails to operate properly. Do step 35.
Low oil pressure light on APU control box fails to operate properly. Do step 35.
Oil pressure gage fails to operate.
Do step 35.
Battery-generator indicator reads in yellow or lower red region with APU engine running and APU generator
Do steps 36 thru 38.