Section X. MAINTENANCE OF ENGINE ELECTRICAL SYSTEM

TM-5-6115-585-12 Generator Set Diesel Engine Driven Tactical Skid Mtd 5 KW 1 Phase 2 Wire 1 Phase-3 Wire 3 Phase-4 Wire 120 120/240 and 120/208 Volts Manual
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4-25. T M 5 - 6 1 1 5 - 5 8 5 - 12 N A V F A C P - 8 - 6 2 3 - 12 T O – 3 5 C 2 – 3 - 4 5 5 -1 T M - 0 5 6 8 4 C / 0 5 6 8 5 B - 1 2 Figure 4–15. Fuel Solenoid Test Set–Up. Section X. MAINTENANCE OF ENGINE ELECTRICAL SYSTEM 4–24. DESCRIPTION AND FUNCTION. a. The engine is cranked by a 24 volt electric starting motor (see figure 1–7). When starting motor solenoid is energized, the solenoid core pulls in, shift- ing the pinion gear into engagement with the engine flywheel ring gear. At the same time, contacts in the solenoid close to provide a circuit for the starter. The starting motor is protected from overspeeding by an overrunning clutch. Two 12 volt batteries in series are used. The starting switch for this starting circuit is lo- cated in the control cubicle, A blower wheel alternator is utilized to maintain the battery charge. The stator is mounted on the engine block and the permanent mag- net rotor is mounted into the air cooling system blower. Solid state diode rectifiers convert the alternating cur- rent generated in the stator to direct current for battery charging. b. A new (Style II) gear–reduction electric starter will be installed on engines manufactured during 1990; and will be available as a replacement when the origi- nal starter, (Style I ) is no longer available. The Style II starters are interchangeable with the Style I starter. c. Slave receptacle is used to supply external cranking power and as an output receptacle for other equipment. Refer to Figure 4–34 for removal and in- stallation of slave receptacle. Metal objects making contact be- tween the positive and negative battery terminals, or between the positive battery terminal and the gen- erator frame can cause FIRE or EXPLOSION, Always keep the bat- tery terminal covers on the battery terminals. See Figure 3–2, BATTERY ASSEMBLY. Battery Cables (Including Jumper Cable). On ASK equipped generators, remove BATTERIES ac- cess door. (1) Test. Test battery cable for continuity, Re- place any cable that does not show continuity, (2) Remove. Remove negative battery cable from negative (–) battery terminal. Remove positive (+) battery cable from positive battery terminal. Tag and disconnect cables from starter case and starter solenoid. Remove jumper between batteries. Clean battery, starter, and starter solenoid terminals thoroughly and install new cables as given below. (3) Replace. Attach jumper cable between negative (–) terminal of one battery and positive (+) ter- minal of the other battery. Attach positive battery cable to the “B” Terminal stud on starter solenoid. Attach 4–24 Change 11

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