Mitsubishi Heavy Industries S4S User Manual

ELECTRICAL SYSTEM
12-13
2.3.5 Measuring commutator outside diameter
Measure the commutator outside diameter.
If the measured value is less than the limit, replace the
armature with a new one.
Measuring commutator outside diameter
2.3.6 Measuring undercut depth
Measure the depth of undercutting between the commutator
segments.
If the measured value is less than the limit, repair or replace
with a new part.
Measuring commutator undercut depth
2.3.7 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.
Inspecting armature coil for short circuit
(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.
Inspecting insulation between commutator and shaft
Item Nominal Limit
Commutator outside diameter
32 mm
[1.26 in.]
31.4 mm
[1.236 in.]
Outside
diameter
Item Standard Limit
Undercut depth
0.4 to 0.6
[0.016 to 0.024 in.]
0.2 mm
[0.008 in.]
Segment
Undercut
Mica
Growler tester
Iron plate

Mitsubishi Heavy Industries S4S Specifications

General

Brand	Mitsubishi Heavy Industries
Model	S4S
Category	Engine
Language	English