Brush Wear - Kubota D1503-M Workshop Manual

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG WSM
Commutator and Mica (Continued)
1. Check the contact 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
spec.
Mica under cut
Allowable limit
(1) Segment
(2) Depth of Mica
(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 caliper.
3. If the length is less than the allowable limit, replace the yoke
assembly and brush holder.
Factory spec.
Brush length (A)
Allowable
limit
S-99
DIESEL ENGINE
D1503-M
D1703-M
D1803-M
V2003-M
V2203-M
V2403-M
V2403-M-T 0.45 to 0.75 mm
D1803-M-DI 0.018 to 0.029 in.
V2403-M-DI
V2403-M-DI-T
D1703-M-BG
V2003-M-BG
V2003-M-T-BG
V2203-M-BG
0.55 to 0.85 mm
V2403-M-BG
0.022 to 0.033 in.
0.20 mm
0.0079 in.
(a) Correct
(b) Incorrect
15.0 mm
0.591 in.
D1503-M
D1703-M
V2003-M
V2203-M
11.0 mm
D1803-M-DI
0.433 in.
D1703-M-BG
V2003-M-BG
V2003-M-T-BG
V2203-M-BG
D1803-M
V2403-M
9.0 mm
V2403-M-T
0.35 in.
V2403-M-DI
V2403-M-DI-T
12.0 mm
V2403-M-BG
0.472 in.
KiSC issued 07, 2008 A
W1155802
W1156360