Kubota WSM 05-E3B Series Workshop Manual page 126

05-E3B, 05-E3BG, WSM
Commutator and Mica
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.
Commutator
O.D.
Allowable
limit
Factory
spec.
Difference of
O.D.'s
Allowable
limit
Factory spec.
Mica under cut
Allowable limit
(1) Segment
(2) Depth of Mica
(3) Mica
Brush Wear
1. If the connect 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 than the allowable limit, replace the yoke assembly
and brush holder.
Factory spec.
Brush length A
Allowable limit
S-71
DIESEL ENGINE
Electromagnetic 28.0 mm
drive type 1.10 in.
Gear reduction 30.0 mm
type 1.18 in.
Electromagnetic 27.0 mm
drive type 1.06 in.
Gear reduction 29.0 mm
type 1.14 in.
Electromagnetic Less than 0.05 mm
drive type
Gear reduction Less than 0.02 mm
type
Electromagnetic 0.4 mm
drive type 0.02 in.
Gear reduction 0.05 mm
type 0.002 in.
0.50 to 0.80 mm
0.020 to 0.031 in.
0.20 mm
0.0079 in.
(a) Correct
(b) Incorrect
16.0 mm
0.630 in.
10.5 mm
0.413 in.
KiSC issued 12, 2007 A
0.002 in.
0.0008 in.
W1155802
W1156360