Servicing - Kubota M6800S Workshop Manual

M6800 · M6800S · M8200 · M9000, WSM

(3) Servicing

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.
Factory spec.
Commutator O.D.
Allowable limit
Factory spec.
Mica undercut
Allowable limit
(1) Segment
(2) Depth of Mica
(3) Mica
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.
Factory spec.
Brush length (A)
Allowable limit
9-S16
ELECTRICAL SYSTEM
32 mm
1.2598 in.
31.4 mm
1.2362 in.
0.50 to 0.80 mm
0.0197 to 0.0315 in.
0.20 mm
0.0079 in.
(a) Good
(b) Bad
W1017092
18.0 mm
0.7086 in.
11.0 mm
0.4331 in.
W1017544
KiSC issued 03, 2008 A