Servicing; Starting System - Kubota ZD221-48 Workshop Manual

20221. WSM
ELECTRICAL SYSTEM
[3] SERVICING
(1) Starting System
3EEABAB1P188A
13EEABAB1P182A
3EEABABl P183A
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. Ifthe pinion slips or does not rotate in the both directions, replace
the overrunning clutch assembly.
Wl022548
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 0.0. 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.
Commutator 0.0.
Factory spec.
30.0mm
1.181 in.
Allowable limit
29.0mm
1.142 in.
Factory spec.
Less than 0.02 mm
Less than 0.0008 in.
Difference of O.o.'s
Allowable limit
0.05mm
0.0020 in.
3EEABAB1 P184A
3TAAAAB9P037 A
(A)
Factory spec.
0.50 to 0.80 mm
0.0197 to 0.0315 in.
Mica undercut
I
Allowable limit
0.20 mm
0.0079 in.
(1) Segment
(a) Correct
(2) Undercut
(b) Incorrect
(3) Mica
W1022696
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.
14.0 mm
0.551 in.
Brush length (A)
Allowable limit
9.0mm
0.354 in.
W1022961
5-S19