Kubota RTV1140CPX, Workshop Manual

Page: 375 / 379

ELECTRICAL SYSTEM
RTV1140CPX, WSM
8-S32
[3] SERVICING
(1) Starter
Overrunning Clutch
1. Inspect the pinion for wear or damage.
2. If there is any defect, replace the overrunning clutch assembly.
3. Check that the pinion turns freely and smoothly in the
overrunning direction and does not slip in the cranking direction.
4. If the pinion slips or does not rotate in the both directions,
replace the overrunning clutch assembly.
9Y1210293ELS0047US0
Commutator and Mica
1. Check the contact face of the commutator for wear, and grind
the commutator with emery paper if it is slightly worn.
2. Measure the commutator O.D. with an outside micrometer at
several points.
3. If the minimum O.D. is less than the allowable limit, replace the
armature.
4. If the difference of the O.D.'s exceeds the allowable limit, correct
the commutator on a lathe to the factory specification.
5. Measure the mica undercut.
6. If the undercut is less than the allowable limit, correct it with a
saw blade and chamfer the segment edges.
9Y1210293ELS0048US0
Brush Wear
1. If the contact face of the brush is dirty or dusty, clean it with
emery paper.
2. Measure the brush length (A) with vernier calipers.
3. If the length is less than the allowable limit, replace the yoke
assembly and brush holder.
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Commutator O.D.
Factory specification
30.0 mm
1.18 in.
Allowable limit
29.0 mm
1.14 in.
Difference of O.D.'s
Factory specification
Less than
0.02 mm
0.0008 in.
Allowable limit
0.05 mm
0.002 in.
Mica undercut
Factory specification
0.50 to 0.80 mm
0.020 to 0.031 in.
Allowable limit
0.20 mm
0.0079 in.
(1) Segment
(2) Undercut
(3) Mica (a) Correct
(b) Incorrect
Brush length (A)
Factory specification
14.0 mm
0.551 in.
Allowable limit
9.0 mm
0.35 in.
KiSC issued 05, 2014 A