Checking Brush Wear Of Starter - Kubota WSM 05-E4B Series Workshop Manual

SERVICING
6. Servicing
3. Measure the commutator O.D. with an external
micrometer at several points.
NOTE
• If the minimum O.D. is less than the service
limit, replace the armature assembly.
• If the difference of the O.D.'s more than the
service limit, correct the commutator on a
lathe to the service specification.
Service speci-
fication
Commutator
O.D.
Service limit
Service speci-
fication
Difference of
O.D.'s
Service limit
4. Measure the mica undercut.
NOTE
• If the undercut is less than the service limit,
correct it with a saw blade. Chamfer the
segment edges.
05-E4B SERIES,05-E4BG SERIES
Electromag-
28.0 mm
netic drive
1.10 in.
type
Gear reduc- 30.0 mm
tion type 1.18 in.
Electromag- 27.0 mm
netic drive 1.06 in.
type
Gear reduc- 29.0 mm
tion type 1.14 in.
Electromag- Less than
netic drive 0.05 mm
type Less than
0.002 in.
Gear reduc- Less than
tion type 0.02 mm
Less than
0.0008 in.
Electromag- 0.4 mm
netic drive 0.02 in.
type
Gear reduc- 0.05 mm
tion type 0.002 in.
Service specifi-
cation
Mica undercut
Service limit
(1) Segment
(2) Depth of mica
(3) Mica

6.44 Checking brush wear of starter

Tools required
• Vernier caliper
• Emery paper (#300 or above)
1. Measure the brush length (A) with a vernier caliper.
NOTE
• If the length is less than the service limit,
replace the yoke assembly and brush holder
assembly.
Service specifi-
cation
Brush length (A)
Service limit
(A) Brush length
2. After you replace the brush, put an emery paper
(#300 or above) on the commutator and correct the
contact position.
4. ENGINE
0.50 to 0.80 mm
0.020 to 0.031 in.
0.20 mm
0.0079 in.
(a) Good
(b) Bad
16.0 mm
0.630 in.
10.5 mm
0.413 in.
4-75
KiSC issued 03, 2023 A