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DISASSEMBLY - TM-5-4210-229-14P_359
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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ASSEMBLY - TM-5-4210-229-14P_361
TM5-4210-229-14&P 5-12. ALTERNATOR REPAIR (Continued). n. Using  a  bearing  puller  remove  drive  end  housing (20) and bearing assembly (35) from the rotor shaft (19). o. Remove four screws  (36)  and  bearing  retainer  (37) and press bearing out of drive end housing. p. With a heat gun, remove wire (38) that connects the rotor coil (19) to the outside slip ring (39).  Unsolder the  wire  from  the  inside  slip  ring  (40)  and  with  a bearing  puller,  remove  the  slip  ring  assembly  and insulation washer (41). q. Using a bearing puller, remove the bearing (42). TEST NOTE Before  performing  these  tests,  inspect  all  parts for   wear,   cracks,   or   other   mechanical   defects. Replace all damaged parts. a. Positive heat sink test. NOTE The   positive   heat   sink   is   the   one   to   which positive    output    terminal    is    connected.        The square  hole  in  the  positive  heat  sink  is  larger than the negative heat sink hole. (1) Connect  the  positive  lead  of  the  test  lamp  to the positive heat sink and touch the negative test lead to each of the three diode terminals. The  test  lamp  should  not  light.    If  the  test lamp lights, the diode is shorted. (2) Reverse  the  test  leads  so  that  the  negative test   lead   is   connected   to   the   positive   heat sink.    The  positive  test  lead  should  now  be touched  to  each  diode  terminal.    If  the  test lamp fails to light, an open diode is indicated. (3) If   a   shortened   or   open   diode   is   detected, replace the entire heat sink assembly. b. Negative heat sink test. (1) Connect the negative lead of the test lamp to the negative heat sink and touch the positive test lead to each of the three diode terminals. The test lamp should not light.  If the test lamp lights, the diode is shorted. (2) Reverse the test leads so that the positive test lead is connected to the negative heat sink. The negative test lead should now be touched to each diode terminal.  If the test lamp fails to light, an open diode is indicated. (3) If a shorted or open diode is detected, replace the entire heat sink assembly. 5-29

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