Cleaning and Inspection

 CAUTION: Do not wash the drive because the solvent will wash out the lubricant causing drive to slip. Use a brush or compressed air to clean the drive, armature, brush, and gear assemblies, drive end housing, pole pieces and planet gears. Wash all other parts in solvent and dry.

1. Inspect armature windings for broken or burned insulation and unwelded or open connections.

2. Check armature for open circuits, shorts and grounds. Check for pole rub or rub on magnetic shunts.

3. Check commutator for runout. Inspect armature shaft and two bearings for scoring and excessive wear with Dial Indicator D87L-4201-A and Magnetic Base D87L-4201-B or equivalent. If commutator is rough, or more than 0.12mm (0.005 inch) out of round, it must be replaced.
   
   
   
   

4. Examine gears, spline on driveshaft, and drive pinion for chipped, broken or worn conditions. Replace if required.