Mitsubishi Heavy Industries S3L, Service Manual

Page: 147 / 200

ELECTRICAL SYSTEM
12-15
2.4.4 Measuring commutator radial runout
(1)
Inspect the commutator surface. If the surface is rough,
polish it using a 400 to 600 grit sandpaper.
(2)
Measure the commutator radial runout with a dial
gauge. If the measured value exceeds the limit, replace
the armature with a new one.
Measuring commutator radial runout
2.4.5 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
2.4.6 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 mica depth
Item Standard Limit
Commutator
radial runout
M001T68281
0.05 mm
[0.0020 in.]
0.10 mm
[0.0039 in.]
M008T70471A
M008T81071A 0.03 mm
[0.0012]
Commutator
Item Standard Limit
Commutator out-
side diameter
M001T68281
29.4 mm
[1.158 in.]
28.8 mm
[1.134 in.]
M008T70471A
M008T81071A 32.0 mm
[1.260 in.]
31.4 mm
[1.236 in.]
Outside
diameter
Item Standard Limit
Undercutting depth
0.5 mm
[0.020 in.]
0.2 mm
[0.008 in.]
Segment
Undercut
Mica