AUXILIARY POWER UNIT HOURMETER DOES NOT WORK

APU CONTROL BOX ENGINE OIL PRESSURE GAUGE READS ZERO WITH APU ENGINE RUNNING (cont) - TM-9-2350-292-20-1_177

AUXILIARY POWER UNIT HOURMETER DOES NOT WORK (cont) - TM-9-2350-292-20-1_179

TM-9-2350-292-20-1 Carrier Ammunition Tracked M992A1(NSN 2360-01-362-3021) EIC:AE6 Manual
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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).

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