TM 9--2350--292--20--1
0026 00--1
AUXILIARY POWER UNIT HOURMETER DOES NOT WORK.
0026 00
THIS WORK PACKAGE COVERS:
Auxiliary Power Unit Hourmeter Does Not Work
INITIAL SETUP:
Tools and Special Tools
General mechanic’s tool kit (item 1, WP 0717 00)
Multimeter (item 84, WP 0717 00)
Materials/Parts
Adhesive (item 25, WP 0716 00)
Equipment Conditions
Vehicle MASTER switch OFF (TM 9--2350--292--10)
APU cover removed (WP 0413 00)
Personnel Required
Two
Is hourmeter damaged?
1. Open APU door (TM 9--2350--292--10).
2. Observe hourmeter for broken glass window or
other physical damage.
no
yes
A
B
CONTINUED ON NEXT PAGE
Is 24 V dc present?
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.
Replace hourmeter
(WP 0663 00). Verify
fault is corrected.
NOTE
Remove sealant from electrical terminals to
ensure good contact for multimeter leads.
Apply adhesive to all exposed terminals
after troubleshooting is complete.
1. Open front engine deck grilles
(TM 9--2350--292--10).
2. Disconnect harness 3W730 lead 658 and
ground lead from hourmeter.
3. Place multimeter red lead to harness 3W730
lead 658 and black lead to ground.
4. Turn MASTER switch ON
(TM 9--2350--292--10).
5. Turn FUEL SHUTOFF switch ON
(TM 9--2350--292--10)
6. Check for voltage
7. Turn FUEL SHUTOFF and MASTER
switches switch OFF (TM 9--2350--292--10).
