Brushes that are worn out, or oil-soaked, should be replaced.

When replacing field coil brushes, crush worn out brushes with pliers, taking care not to damage the pigtail.

Sand the pigtail end with sandpaper to ensure good soldering.

Insert the pigtail into the hole provided in the new brush and solder it. Make sure that the pigtail and excess solder do not come out onto thebrush surface.

When replacing the ground brush, slide the brush from the brush holder by prying the retaining spring back.

Do not immerse parts in cleaning solvent. Immersing the yoke and field coil assembly and/or armature will damage the insulation. Wipe these partswith a cloth only.

Do not immerse the drive unit in cleaning solvent. The overrun clutch is pre-lubricated at the factory and solvent will wash lubrication from theclutch.

The drive unit may be cleaned with a brush moistened with cleaning solvent and wiped dry with a cloth.

Place the armature on a pair of V-blocks, and check the run - out by using a dial gauge.

Check the outer diameter of the commutator.

Check the depth of the undercut between segments.

While holding the clutch housing, rotate the pinion. The drive pinion should rotate smoothly in one direction, but should not rotate in the opposite direction. If the clutch does not function properly, replace the overrun clutchassembly.

Inspect the pinion for wear or burrs. If the pinion is worn or burred, replace the overrun clutch assembly. If the pinion is damaged, also inspectthe ring gear for wear or burrs.

Press the stop ring using a socket.

After removing the snap ring (using snap-ring pliers), remove the stop ring and the overrunning clutch.