TM 10-3930-659-34 4-29. STARTER MOTOR REPAIR (Con’t). WARNING Compressed  air  used  for  cleaning  or  drying  purposes,  or  for  clearing  restrictions,  should  never exceed 30 psi (207 kPa).  Wear protective clothing (goggles/shield, gloves, etc.) and use caution to avoid injury to personnel. 4. Using crocus cloth, clean and polish commutator of armature.  Remove loose particles with compressed air. 5. Using armature test set, test armature for shorting. 6. Check  brushes  for  excessive  wear.    Replace  if  broken  or  excessively  worn.    Full  surface  of  each  brush  should contact commutator of armature. 7. Inspect brush springs for breaks and discoloration.  Replace broken or discolored brush springs. 8. Inspect threaded parts for damaged threads.  Replace damaged parts. 9. If removed, inspect wicks for damage.  Replace damaged wicks. 10. Inspect windings of field coil for damage or burned insulation.  Replace damaged field coil. c.           ASSEMBLY 1. Install insulator (64) on starter housing (4). 2. Install insulator (58), four poles (59), and field coil (65) on starter housing (4) with seven new preformed packings (60) and screws (61). 3. Install new preformed packing (63) and terminal (62) on starter housing (4). 4. If removed, saturate wick (50) with lubricating oil.  Install wick and new cup (51) on housing (9). 4-121