Figure 11-14. Testing Rotation Rectifiers with an Ohmmeter

Figure 11-15. Removing Bearing from Generator Shaft

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 Figure 11-14. Testing Rotation Rectifiers with an Ohmmeter Tag leads for later reconnection (c) Remove rotating rectifier with key (53 from exciter rotor (38). (2) Replacement. (a) Install rotating rectifier assembly onto exciter rotor (38). NOTE Make certain the key is in place and the keyway in the rotating rectifier is aligned with key before installing. (b) Connect leads to (+) and (-) terminals; remove tags. (c) Replace cover (30) with screws (26 and 28), washers (29), and nuts (27). d. Repair. The rotating rectifier assembly repairs involve replacement of diode and surge protector. (1) Remove and replace standard diodes (39, figure 11-3), detail A) and reverse diodes (42) on rotating rectifier heat sinks with washers (41 and 44) and nuts (40 and 43). Reconnect leads. (2) Remove and replace surge protector (51) from heat sink with screws (45), washers (47 and 48), and nuts (46). 11-9. BEARING. The generator bearing is permanently lubricated and sealed. If a defective bearing is indicated by vibration or noise at the bearing housing on the endball, the bearing can be replaced without removal of the generator from the set. a. Replacement. (1) Removal. To gain access to the bearing (88, figure 11-3), the endbell (85) with PMG stator (33) and exciter assembly must be removed as a unit. Use crane or hoist to remove. WARNING OVERHEAD OPERATIONS HAVE INHERENT HAZARDS THAT CANNOT BE MECHANICALLY SAFEGUARDED. HARD HATS AND SAFETY SHOES ARE REQUIRED. (a) Remove cover (30) by removing screws (26 and 28), washers (29), and nuts (27). WARNING USE EXTRA CARE WHEN REMOVING ROTOR TO PREVENT INJURY TO HANDS DUE TO MAGNETIC ATTRACTION BETWEEN THE PMG ROTOR AND THE PMG STATOR OR GENERATOR SHAFT. (b) Remove PMG rotor (37) by removing pin (36), screw (35), and washer (34). NOTE Do not subject PMG rotor to severe mechanical shock. (c) Loosen setscrews (52) in exciter rotor (38). (d) Remove exciter rotor (38). (e) Remove screws (82) and washers (83) to free bearing cap (84). (f) Attach crane or hoist to endbell (85). Remove bolts (80) and washers (81). Remove endbell (85) and PMG 11-25

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