ELECTRICAL SYSTEM

TM-9-2350-256-34-1 Recovery Vehicle Full-Tracked: Medium M88A1 (NSN 2350-00-122-6826) Manual
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TM 9-2350-256-34-1 Table-22 Troubleshooting-Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ELECTRICAL SYSTEM-Continued 7. BATTERY GENERATOR INDICATOR READS IN BOTTOM OF LOWER RED REGION (NO DEFLECTION) WITH MASTER SWITCH ON Check for defective master relay. Refer to Fault Isolation Diagram, TM 9-2350-256-20, Medium Recovery Vehicle, M88A.1. Repair or replace master relay (para. 3-46). 8. ALL CIRCUITS DEAD EXCEPT PERSONNEL HEATER, MASTER RELAY LAMP, AND SLAVE RECEPTACLE Check main power bus. Refer to Fault Isolation Diagram, TM 9-2350-256-20, Medium Recovery Vehicle, M88A1. Repair or replace defective components. 9. Deleted 10. INFRARED SYSTEM (DRIVER’S PERISCOPE) FAILS TO OPERATE Check for defective high voltage power pack. Refer to Fault Isolation Diagram, TM 9-2350-256-20, Medium Recovery Vehicle, M88A1. Replace infrared power pack, if defective (para. 2-21). MECHANICAL TACHOMETER AND SPEEDOMETER 11. MECHANICAL TACHOMETER OR SPEEDOMETER FAILS TO REGISTER Step 1. Check for flexible shaft ends that might have twisted off. Replace flexible shaft assembly, if defective (para 2-20). Step 2. Check 900 drive adapter for stripped threads. Repair or replace adapter (para 3-40). AUXILIARY POWER UNIT 12. ENGINE FAILS TO CRANK Step 1. Check for defective starting system components and/or associated wiring. Refer to Fault Isolation Diagram, TM 9-2350- 256-20, Medium Recovery Vehicle, M88A1. Repair or replace defective starting system components and/or associated wiring (para 2.-15a. 2-21b, 2-21c, 3-48, and 4-2b of TM 9-2350-256-34-1 and para. 2-58 of TM 9-2815-221-34&P, Engine. Diesel Industrial Type, Model DJBMA). Step 2. Attempt to turn engine over using a 5/8 inch. 112 inch square drive socket. extension and torque wrench set for 70 lb-ft on the flywheel mounting screw. located at the center of the flywheeL If engine turns over. recheck electrical system using Fault Isolation Diagram, TM 9-2350-256-20, Medium Recovery Vehicle M88A1. If engine fails to turn over, drain oil from APU crankcase. Remove crankcase and drive sprocket (para 4-2). a If engine will not turn over with 70 lb-ft of torque applied to flywheel mounting screw, repair or replace APU engine (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA). b. If engine will turn over with 70 lb-ft or less of torque applied to flywheel mounting screw, inspect generator and hydraulic pump for seizure. Replace defective components. 13. ENGINE CRANKS BUT FAILS TO START Step 1. Check fuel shutoff switch, fuel solenoid. and associated wiring. Refer to Fault Isolation Diagram. TM 9-2350-256-20, Medium Recovery Vehicle, M88A1. Repair or replace defective components (para. 3-45 and TM 9-2815-221-34&P. Engine, Diesel. Industrial Type, Model DJBMA). Step 2. Open the bleeder valve on the primary fuel filter and 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. If no fuel is pumped from the filter. replace the fuel pump (TM 9-2815-221-34&P, Engine, Diesel. Industrial Type, Model DJBMA). Step 3. Remove the APU armor cover (TM 9-2350-256-20, Medium Recovery Vehicle, M88A1}. 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, Engine, Diesel Industrial type, Model DJBMA). b. If fuel is pumped from the loosened fuel tube, check the fuel injector nozzles (TM 9-2815-221-34&P. Engine, Diesel Industrial Type, Model DJBMA). 14. ENGINE HARD TO START Step 1. Remove APU armor cover (TM 9-2350-256-20, Medium Recovery Vehicle, M88A1). Step 2. Test fuel injector pump (TM 9-2815-221-34&P, Engine, Diesel Industrial Type, Model DJBMA). Replace fuel injector pump if defective (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA). Step 3. Test fuel injector nozzles (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type, Model DJBMA). Replace fuel injector nozzles if defective (TM 9-2815-221-34&P, Engine, Diesel. Industrial Type, Model DJBMA). Step 4. Check engine timing (TM 9-2815-221-34&P, Engine, Diesel Industrial Type, Model DJBMA). Retime engine (TM 9-2815-221-34&P, Engine, Diesel Industrial Type, Model DJBMA). Step 5. Check valve clearance (TM 9-2815-221-34&P, Engine, Diesel. Industrial Type, Model DJBMA). Adjust valve clearance (TM 9-2815-221-34&P, Engine, Diesel, Industrial Type. Model DJBMA). 2-8 CHANGE 7

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