Kubota D1803-CR-E4 - Checking Brush Wear of Starter

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.
Commutator
O.D.
Service speci-
fication
D1803-CR-E4
D1803-CR-
TE4
D1803-CR-
TIE4
30.0 mm
1.18 in.
V2403-CR-E4
V2403-CR-
TE4
V2403-CR-
TE4BG
V2403-CR-
TIE4
35.0 mm
1.38 in.
Service limit
D1803-CR-E4
D1803-CR-
TE4
D1803-CR-
TIE4
29.0 mm
1.14 in.
V2403-CR-E4
V2403-CR-
TE4
V2403-CR-
TE4BG
V2403-CR-
TIE4
34.0 mm
1.34 in.
Difference of
O.D.'s
Service speci-
fication
Less than
0.02 mm
0.0008 in.
Service limit
0.05 mm
0.002 in.
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.
Mica undercut
Service specifi-
cation
0.45 to 0.75 mm
0.018 to 0.029 in.
Service limit
0.20 mm
0.0079 in.
(1) Segment
(2) Depth of mica
(3)
Mica
(a) Good
(b) Bad
7.45 Checking brush wear of starter
Tools required
• V
ernier caliper
• Emery paper (#300 or above)
4. ENGINE
SERVICING
7. Servicing
4-186
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A