Initial Inspection and Diagnostic Overview

Commutator:

1. Place the armature on a pair of V-blocks, and check the deflection by using a dial gauge.
Standard value: 0.05 mm (0.002 in.)
Limit: 0.1 mm (0.004 in.)

Commutator:

2. Measure the commutator outer diameter.
Standard value: 32.0 mm (1.260 in.)
Limit: 31.0 mm (1.220 in.)

Commutator:

3. Check the undercut depth between segments.
Standard value: 0.5 mm (0.020 in.)