Initial Inspection and Diagnostic Overview

CHECKING THE COMMUTATOR




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

Standard value
Armature deflection : 0.05 mm (0.002 in.)

Limit
Armature deflection : 0.1 mm (0.0039 in.)




2. Check the outer diameter of the commutator.

Standard value
Outer diameter of the commutator: 29.4 mm (1.157 in.)

Limit
Outer diameter of the commutator: 28.4 mm (1.118 in.)




3. Check the depth of the undercut between segments.

Standard value
Depth of the undercut between segments : 0.5 mm (0.020 in.)

Limit
Depth of the undercut between segments: 0.2 mm (0.0079 in.)

OVERRUNNING CLUTCH
1. While holding clutch housing, rotate the pinion. Drive pinion should rotate smoothly in one direction, but should not rotate in opposite direction. If clutch does not function properly, replace overrunning clutch assembly.




2. Inspect pinion for wear or burrs. If pinion is worn or burred, replace overrunning clutch assembly. If pinion is damaged, also inspect ring gear for wear or burrs.

FRONT AND REAR BRACKET BUSHING
Inspect bushing for wear or burrs. If bushing is worn or burred, replace front bracket assembly or rear bracket assembly.