Mitsubishi S4S Service Manual page 142

ELECTRICAL SYSTEM
2) Measure the diameter of commutator. If it
is smaller than the service limit, replace
the armature.
Unit: mm [in.]
Item
Nominal Service
Value
Limit
12V-2.2kW
32 31.4
Diameter of
[1.24] [1.26]
commutator
38.7 38.1
12V -3 kW
[1.52] [1.50]
3) Measure the depth of each mild between
segments with a depth gage. If the depth is
less than the repair limit, recondition the
mild.
Unit: mm [in.]
Item
Assembly Repair
Standard Limit
Dept of commuta-
0.4 to 0.6 0.20 [0.008]
tor mild
[0.016 to 0.024] or less
(2) Field coil
(a) Testing for open circuit
If there is no continuity between the lead wire
and positive
(+)
brush, the field coil is open
and the yoke assembly should be replaced.
(b) Testing for grounded circuit
If there is any continuity between the yoke
and positive
(+)
brush, check the insulation
and repair or replace the yoke assembly.
12-4
Measuring commutator diameter
~ment
Mode depth .
~
Good Bad
Measuring commutator mold depth
Testing for open circuit
Testing for grounded circuit