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EXCITER-AUXILIARY GENERATOR ASSEMBLY (cont) - TM-55-2210-223-34_143
EXCITER-AUXILIARY GENERATOR ASSEMBLY (cont) - TM-55-2210-223-34_145

TM-55-2210-223-34 Locomotive Diesel-Electric 06-1/2-Inch Gage 60 Ton 000HP 0-4-4-0 Wheel Model RS-4-TC-1A NSN 2210-01-158-2978 Manual
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TM 55-2210-223-34 TO 45A2-2-14-22 3-35.  EXCITER-AUXILIARY GENERATOR ASSEMBLY (cont) CLEANING, INSPECTION, AND REPAIR (cont) NOTE If bands are loose, repair at depot level maintenance facility. e. Check that bands are tight and secure and soldering is intact. f. Use  a  dial  indicator  and  check  commutator  for  roughness  or  out-of-roundness.    Commutator  is  out-of-round  if there  is  a  0.002-inch  (0.05  mm)  variance  within  a  six  bar  span.   Inspect  surface  for  wear,  burns,  or  pitting.   If these conditions exist perform the following: (1)    Use fine grinding stone and give commutator a smooth finish. (2)    Check that mica is undercut to a depth of 1/16 to 3/32 inch (1.6 to 2.4 mm).  If mica depth is not within these limits, use a mica undercutter saw and regroove mica. CAUTION Do not damage commutator bars during cleaning process. (3)    Clean slots between copper bars to remove burrs. WARNING Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa).  Do not direct compressed air against skin.  Use goggles or full face shield. (4)    Use dry compressed air and remove loose mica and copper from commutator. CAUTION Do not coat commutator surfaces with insulating varnish. g. Paint surfaces of coil insulation with red insulating varnish. 3-124







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