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EMERGENCY HYDRAULIC MOTOR DOES NOT OPERATE
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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AUXILIARY POWER UNIT DOES NOT SHUT OFF
TM 5-4210-233-14&P-1 4-2.  Unit Troubleshooting-Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ELECTRICAL SYSTEM - APU AND 11O-VOLT CIRCUITS 1 AUXILIARY POWER UNIT (APU) DOES NOT START/RUN WITH CAB OR PUMP PANEL CONTROLS (Refer to Electrical Wiring Diagrams, Appendix H, Sheet 15 of 16.) Step 1.  Check switch. Replace switch (see para 4-22 or 4-94). Step 2.  Check common/start wires for continuity. Replace wire (see para 4-9.4). Step 3.  Check electric fuel pump for proper operation. Replace fuel pump (see para 4-216). Step 4.  Check APU start solenoid for proper operation. Replace solenoid, Notify Direct Support. Step 5.  Check APU cranking motor. Replace motor, Notify Direct Support. 2 AUXILIARY POWER UNIT (APU) RUNS, BUT NO POWER OUTPUT (Refer to Electrical Wiring Diagrams, Appendix H, Sheet 15 of 16.) Step 1.  Check fuse on APU. Replace fuse (see para 4-9.4). Step 2.  Check service panel circuit breakers are on. Turn on service panel breaker. Step 3.  Check wiring for continuity. Replace wire (see para 4-9.4). Step 4.  Check pump panel and cab panel volt and ammeters for output from APU. Refer to APU troubleshooting procedures. 4-142

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