CHAPTER 5 MAINTENANCE OF STARTING SYSTEM

TM5-6115-584-34 NAVFAC P-8-622-34 TO-35C2-456-2 CHAPTER 5 MAINTENANCE OF STARTING SYSTEM Section I. DESCRIPTION AND FUNCTION 5-1. GENERAL The engine is cranked by a 24 volt electric starter. When the starter rotor solenoid is energized, the solenoid core pulls in, shifting the pinion gear into engagement with the engine flywheel ring gear. The starting motor is protected from overspeeding by an overrunning clutch. At the same time, con- tacts in the solenoid close to provide a circuit for the starter. Two 12 volt batteries in series are used. The starting switch for this starting circuit is located in the control cubicle. Refer to the operator and Organizational Mainten- ance Manual for starting and operating the set. A blower wheel alternator is utilized to recharge the batteries. a. 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 original starter, (Style I) is no longer available. The Style II starter are interchange- able with the Style I starter. Section II. MAINTENANCE 5-2. a. STARTER ASSEMBLY Test on Equipment. Refer to the Operator and Organizational Maintenance Manual. b. Removal. Refer to the Operator and Organiz- ational Maintenance Manual. c. Disassembly; Style I (see figure 5-1) (1) Remove nut (1) and lockwasher (2) from solenoid (13). Remove nut (3) and lockwasher (4) from brush assembly (21) terminal. Tag and remove lead (5). Remove nut (6) and lockwasher (7) from lower solenoid terminal, and loosen field coil connector (8). (2) Remove cotter pin (9) and pin (10) from yoke (32). Remove screws (11), lockwashers (12) and remove solenoid switch (13). (3) Remove through bolts (14), lockwasher (15) and remove back plate assembly (16) and thrust washer (27). Remove nut (17) and lockwasher (18) from brush assembly (21) terminal. Lift brush springs (20) and remove brush assembly (21). Remove the insulating washer set (19) from brush assembly (21). With brush sprinq raised, remove other brushes (26) from brush holder (24). Remove screws (22), lockwashers (23) and remove brush holder (24). (4) Remove retainer (29), boot (30), pin (31 and separate pinion housing (28) and frame assem- bly (25). Do not lose thrust washer (27). (5) Remove yoke (32) and remove armature (33) and drive assembly (35). Remove lock ring and stop (34) by forcing stop toward armature until lock ring becomes accessible. See figure 5-3. Remove lock ring and stop(34), and drive assembly (35) from armature (33). Do not disassemble drive assembly. (6) Remove bearing (36) by pressing from pinion housing (28). d.Disassembly; Style II (see figure 5-2) (1) Remove nut (1) and lockwasher (2) from Solenoid (5). Move lead terminal off solenoid and swing it aside. Install nut and lockwasher on solenoid threaded terminal for safe-keeping. (2) Remove screws (3), spacer(s) (4) and remove solenoid (5) from front bracket. NOTE Solenoid mounting screw removal may requ- ire the use of a impact type driver. (3) Remove nuts (6), flat washers (7) and remove ground terminal bracket assembly (8). NOTE Disassembly of ground terminal bracket assembly not required unless the terminal threads have been damaged. Refer to the repair parts manual for terminal components. Change 7 5-1