TM 9-2350-256-34
0018 00
Battery-generator indicator reads in yellow or lower red region with APU engine running and APU generator
switch on with no auxiliary hydraulic pressure. Do step 39.
Engine does not operate at 2000 100 rpm under load conditions. Do steps 40 thru 47.
CORRECTIVE ACTION
1.
Check for defective starting system components and/or associated wiring.
a.
Repair or replace defective starting system components and/or associated wiring (WP 0033 00,
2.
Attempt to turn engine over using a 5/8 inch, 1/2-inch-square drive socket, extension, and torque
wrench set for 70 lb-ft (94.9 Nm), on the flywheel mounting screw, located at the center of the
flywheel. If engine turns over, recheck electrical system. If engine fails to turn over, drain oil from
a.
If engine will not turn over with 70 lb-ft (94.9 Nm) of torque applied to flywheel mounting
screw, repair or replace APU engine (WP 0083 00 or TM 9-2815-221-34&P).
b.
If engine will turn over with 70 lb-ft (94.9 Nm) or less of torque applied to the flywheel mounting
screw, inspect generator and hydraulic pump for seizure. Replace defective components.
3.
Check fuel shutoff switch, fuel solenoid, and associated wiring.
a.
Repair or replace defective components (TM 9-2815-221-34&P).
4.
Open the bleeder valve on the primary fuel filter to allow all the diesel fuel to drain from the filter. Have
an assistant attempt to start the APU. If fuel is pumped from the filter, close the valve.
a.
If no fuel is pumped from the filter, replace the fuel pump (TM 9-2815-221-34&P).
5.
Remove the APU armor cover (TM 9-2350-256-20). Loosen, but do not remove, one of the two high
pressure fuel tubes from the fuel injection pump. Have an assistant attempt to start the APU.
a.
If no fuel is pumped from the loosened fuel tube, replace the fuel injector pump (TM 9-2815-221-
34&P).
b.
If fuel is pumped from the loosened fuel tube, check the fuel injector nozzles (TM 9-2815-221-
34&P).
6.
Remove APU armor cover (TM 9-2350-256-20).
7.
Test fuel injector pump (TM 9-2815-221-34&P).
a.
Replace fuel injector pump if defective (TM 9-2815-221-34&P).
8.
Test fuel injector nozzles (TM 9-2815-221-34&P).
a.
Replace fuel injector nozzles if defective (TM 9-2815-221-34&P).
9.
Check engine timing (TM 9-2815-221-34&P).
a.
Retime engine (TM 9-2815-221-34&P).
10. Check valve clearance (TM 9-2815-221-34&P).
a.
Adjust valve clearance (TM 9-2815-221-34&P).
11. Check engine compression (TM 9-2815-221-34&P).
a.
12. Check for defective preheat components and/or associated wiring.
a.
Repair or replace defective preheat components and/or associated wiring (TM 9-2350-256-20
and/or TM 9-2815-221-34&P).
13. Remove APU armor cover (TM 9-2350-256-20).
0018 00-2