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Remove drive assembly from shaft.
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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_365
TM5-4210-229-14&P 5-13. STARTER REPAIR. (Continued). TEST a. Testing shunt coil for open. Cleaning  solvent,  Federal  Specification  P-D-680  is both toxic and flammable.  Keep off skin.  Use only in    a    well    ventilated    area    and    avoid    prolonged breathing of vapors.  Keep away from open flame. (1) Clean   all   starting   motor   parts   with   solvent (Appendix D, Item 54). (2) Inspect     armature commutator,     shaft     and bushings,  overrunning  clutch  pinion,  brushes and    springs    for    discoloration,    damage    or wear.  Replace as required. (3) Check fit of armature shaft in bushing in drive housing.        Shaft    should    fit    snugly    in    the bushing.    If  the  bushing  is  worn,  it  should  be replaced. (4) Inspect armature  commutator.  If  commutator is  rough,  it  should  be  turned  down.    Inspect the points where the armature conductors join the commutator bars to make sure they have a good connection.  A burned commutator bar is usually evidence of a poor connection. (5) Check    the    armature    for    short    circuits    by placing   on   growler   and   holding   hack   saw blade  over  armature  core  while  armature  is rotated.    If  saw  blade  vibrates,  armature  is shorted.  Recheck after cleaning between the commutator  bars.    If  saw  blade  still  vibrates, replace the armature. (6) Using a test lamp, place one lead on the shut coil  terminal  and  connect  the  other  lead  to  a ground brush.  This test should be made from both    ground    brushes    to    insure    continuity through  both  brushes  and  leads.    If  the  lamp fails  to  light,  the  field  coil  is  open  and  will require replacement. b. Testing series coil for open. Using a test lamp, place one lead on the series coil terminal  and  the  other  lead  on  the  insulated  brush. If the lamp fails to light, the series coil is open and will require repair or replacement.  This test should be made from each insulated brush to check brush and lead continuity. 5-33

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