Kubota GR1600EC2, Workshop Manual, Page: 221 / 241

6-S22
GR1600EC2, WSM ELECTRICAL SYSTEM
[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.
W1016990
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.
W1017092
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.
W1017544
Commutator O.D.
Factory spec.
28.0 mm
1.102 in.
Allowable limit
27.0 mm
1.063 in.
Difference of O.D.’s
Factory spec.
Less than 0.05 mm
0.002 in.
Allowable limit
0.4 mm
0.016 in.
Mica undercut
Factory spec.
0.50 to 0.80 mm
0.0197 to 0.0315 in.
Allowable limit
0.20 mm
0.0079 in.
(1) Segment
(2) Undercut
(3) Mica (a) Correct
(b) Incorrect
Brush length (A)
Factory spec.
16.0 mm
0.630 in.
Allowable limit
10.5 mm
0.413 in.
KiSC issued 07, 2006 A