TM 9-2350-256-20-1
UNIT MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
APU
TROUBLESHOOTING PROCEDURE
INITIAL SETUP:
Tools and Special Tools
References (cont.)
Tool kit, general mechanic's (item 59, WP 0490 00)
WP 0334 00
References
WP 0433 00
WP 0436 00
TM 9-2350-256-10
Troubleshooting Procedure
APU
Symptom
APU malfunctioning.
Malfunction
Engine fails to crank when starting switch is operated. Do steps 1 and 2.
Engine cranks but fails to start.
Do steps 3 and 7.
Engine hard to start.
Do steps 4 thru 6, 8, and 10.
Engine starts but fails to keep running, or lacks power. Do steps 8, and 11 thru 13.
Engine overheating.
Do steps 13 and 14.
Engine discharges black smoke.
Do steps 16 and 17.
Engine knocks.
Do step 1.
Engine uses excessive oil and discharges light blue smoky exhaust. Do step 18.
CORRECTIVE ACTION
1.
Remove APU access cover (see WP 0334 00). Check for loose electrical connections. Clean and
tighten connections if loose.
2.
Troubleshoot APU engine starter circuit (see WP 0059 00).
3.
Remove APU access cover (see WP 0334 00). Check vehicle tank and APU engine fuel supply line for
restrictions or damage. Clean fuel line or replace if necessary (see WP 0436 00).
4.
Remove APU access cover (see WP 0334 00). Check fuel system for water. Bleed water at filters (see
WP 0436 00).
5.
Check for leaking APU fuel lines or fittings. Tighten or replace defective lines or fittings.
6.
Check for dirty fuel filters. Replace fuel filter elements (see WP 0436 00).
7.
Remove access cover (see WP 0334 00). Troubleshoot fuel solenoid circuit (see WP 0059 00). If fuel
solenoid is defective, notify Direct Support Maintenance.
0036 00-1
