TSB : Cleaning & Inspection

Details

Clean field coils, armature, brush end plate, drive end housing and starter drive with compressed air. Wash other parts in solvent. Inspect armature for open circuits, shorts, grounds and broken or burned insulation. Check commutator for scoring or excessive wear. If commutator is rough or more than .005" (.13 mm) out of round, service as necessary. Check brush holders for broken springs and insulated brush holders for shorts to ground. Tighten any loose rivets. Replace brushes if less than .25" (6.4 mm) in length. Check field coils for burned or broken insulation and continuity. Replace as necessary. Examine wear pattern on starter drive teeth. Replace if pitted, or broken teeth are found. Starter drive teeth must engage ring gear teeth more than 1/2 of tooth depth.