TM 9--2350--292--20--1
0009 00--1
AUXILIARY POWER UNIT FAILS TO CRANK
0009 00
THIS WORK PACKAGE COVERS:
Auxiliary Power Unit (ONAN) Fails To Crank
INITIAL SETUP:
Tools and Special Tools
General mechanic’s tool kit (item 1, WP 0717 00)
Multimeter (item 84, WP 0717 00)
Personnel Required
Two
Equipment Conditions
Vehicle MASTER switch OFF (TM 9--2350--292--10)
APU cover removed (WP 0413 00)
System selector valve in MAIN (TM 9--2350--292--10)
WARNING
Remove rings, bracelets, wristwatches,
and neck chains before working on any
vehicle. Jewelry can catch on equip-
ment and cause injury, or may short
across an electrical circuit and cause
severe burns or electrical shock.
Are all connections tight?
Check APU for loose electrical connections.
no
yes
Clean and tighten loose
connections (Chapter 20).
Verify fault is corrected.
Does preheater relay click?
1. Turn MASTER switch ON
(TM 9--2350--292--10).
2. Turn PREHEAT switch ON and OFF and listen
for the preheater relay to click.
3. Turn MASTER switch OFF
(TM 9--2350--292--10).
no
yes
Go to step E.
CONTINUED ON NEXT PAGE
A
B
Go to step C.
