Kubota SM-E4B Series User Manual

ENGINE
SM-E4B SERIES, WSM
1-S70
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.
9Y1210785ENS0102US0
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.
9Y1210785ENS0103US0
Commutator
O.D.
Factory
specifica-
tion
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
specifica-
tion
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 specification
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
Brush length
(A)
Factory
specifica-
tion
Electromagnetic
drive type
16.0 mm
0.630 in.
Planetary gear
reduction type
14.0 mm
0.551 in.
Allowable
limit
Electromagnetic
drive type
10.5 mm
0.413 in.
Planetary gear
reduction type
9.0 mm
0.35 in.
KiSC issued 01, 2013 A

Kubota SM-E4B Series Specifications

General

Brand	Kubota
Model	SM-E4B Series
Category	Engine
Language	English