Commutator Check

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 inch)

Limit: 0.1 mm (0.004 inch)

Fig 1: Placing Armature On Pair V-Blocks
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Check the outer diameter of the commutator.
Standard value: 29.4 mm (1.16 inch)

Minimum limit: 28.8 mm (1.13 inch)

Fig 2: Checking Outer Diameter Of Commutator
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Check the depth of the undercut between segments.
Standard value: 0.5 mm (0.02 inch)

Minimum limit: 0.2 mm (0.008 inch)

Fig 3: Checking Depth Undercut Between Segments
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.