Measuring Commutator Radial Runout; Measuring Commutator Outside Diameter12-15; Measuring Undercut Depth - Mitsubishi Heavy Industries SL Series Service Manual

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.
Item
M001T68281
Commutator
radial runout
M008T70471A
M008T81071A
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.
Item
M001T68281
Commutator out-
side diameter
M008T70471A
M008T81071A
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.
Item
Undercutting depth
Standard Limit
0.05 mm
[0.0020 in.]
0.10 mm
[0.0039 in.]
0.03 mm
[0.0012]
Standard Limit
29.4 mm 28.8 mm
[1.158 in.] [1.134 in.]
32.0 mm 31.4 mm
[1.260 in.] [1.236 in.]
Standard Limit
0.5 mm 0.2 mm
[0.020 in.] [0.008 in.]
ELECTRICAL SYSTEM
Commutator
Measuring commutator radial runout
Measuring commutator outside diameter
Undercut
Segment
Measuring commutator mica depth
Mica
12-15