Kubota SM-E3B Series User Manual

S-73
SM-E3B SERIES WSM
DIESEL ENGINE
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.
W1155802
Commutator
O.D.
Factory
spec.
Electromagnetic
drive type
28.0 mm
1.10 in.
Planetary gear
reduction type
30.0 mm
1.18 in.
Allowable
limit
Electromagnetic
drive type
27.0 mm
1.06 in.
Planetary gear
reduction type
29.0 mm
1.14 in.
Difference of
O.D.’s
Factory
spec.
Electromagnetic
drive type
Less than 0.05 mm
0.002 in.
Planetary gear
reduction type
Less than 0.02 mm
0.0008 in.
Allowable
limit
Electromagnetic
drive type
0.40 mm
0.016 in.
Planetary gear
reduction type
0.05 mm
0.002 in.
Mica under cut
Factory spec.
0.50 to 0.80 mm
0.020 to 0.031 in.
Allowable limit
0.20 mm
0.0079 in.
(1) Segment
(2) Depth of Mica
(3) Mica
(a) Correct
(b) Incorrect
KiSC issued 03, 2011 A

Kubota SM-E3B Series Specifications

General

Brand	Kubota
Model	SM-E3B Series
Category	Engine
Language	English