Checking Brush Wear Of Starter - Kubota D1803-CR-E4 Workshop Manual

4. ENGINE
2. Grind the commutator with emery paper (#300) if it
is lightly worn.
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
4-186
D1803-CR-E4
D1803-CR-
30.0 mm
TE4
1.18 in.
D1803-CR-
TIE4
V2403-CR-E4
V2403-CR-
TE4
35.0 mm
V2403-CR-
1.38 in.
TE4BG
V2403-CR-
TIE4
D1803-CR-E4
D1803-CR-
29.0 mm
TE4
1.14 in.
D1803-CR-
TIE4
V2403-CR-E4
V2403-CR-
TE4
34.0 mm
V2403-CR-
1.34 in.
TE4BG
V2403-CR-
TIE4
Less than
0.02 mm
0.0008 in.
0.05 mm
0.002 in.
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
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.
Service specifi-
cation
Mica undercut
Service limit
(1) Segment
(2) Depth of mica
(3) Mica

7.45 Checking brush wear of starter

Tools required
• Vernier caliper
• Emery paper (#300 or above)
SERVICING
7. Servicing
0.45 to 0.75 mm
0.018 to 0.029 in.
0.20 mm
0.0079 in.
(a) Good
(b) Bad
KiSC issued 12, 2018 A