Checking Armature Coil; Inspecting Rear Bracket - Mitsubishi Heavy Industries SL Series Service Manual

ELECTRICAL SYSTEM
2.4.7

Checking armature coil

(1) Inspect the armature coil using a growler.
Hold a piece of iron plate against the armature core. If
the iron plate vibrates, replace the armature with a new
one.
(2) Check that there is no continuity between the
commutator and the shaft (core).
If any continuity is observed, replace the armature with
a new one.
(3) Check that there is continuity between segments in
various combinations.
If poor or no continuity is observed, replace the
armature with a new one.
2.4.8

Inspecting rear bracket

Replace the rear bracket if the bearing is worn.
12-16
Growler
tester
Inspecting armature coil for short circuit
Inspecting insulation between commutator and shaft
Inspecting continuity between segment
Iron plate