Servicing; Starter - Kubota BX2370 Workshop Manual

BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM

[3] SERVICING

(1) Starter

Overrunning Clutch
1. Inspect the pinion for wear or damage.
2. If there is any problem, 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.
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 specification
Commutator O.D.
Allowable limit
Factory specification
Difference of O.D.'s
Allowable limit
Factory specification
Mica undercut
Allowable limit
(1) Segment
(2) Undercut
(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 specification
Brush length (A)
Allowable limit
6-S31
ELECTRICAL SYSTEM
WSM000001ELS0033US0
30.0 mm
1.181 in.
29.0 mm
1.142 in.
Less than
0.02 mm
0.0008 in.
0.05 mm
0.0020 in.
0.50 to 0.80 mm
0.0197 to 0.0315 in.
0.20 mm
0.0079 in.
(a) Correct
(b) Incorrect
9Y1210855ELS0056US0
14.0 mm
0.551 in.
9.0 mm
0.354 in.
9Y1210855ELS0057US0
KiSC issued 02, 2017 A