Kubota SM-E3B Series Workshop Manual page 134

SM-E3B SERIES 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
S-73
DIESEL ENGINE
Electromagnetic 28.0 mm
drive type 1.10 in.
Planetary gear 30.0 mm
reduction type 1.18 in.
Electromagnetic 27.0 mm
drive type 1.06 in.
Planetary gear 29.0 mm
reduction type 1.14 in.
Electromagnetic Less than 0.05 mm
drive type
Planetary gear Less than 0.02 mm
reduction type 0.0008 in.
Electromagnetic 0.40 mm
drive type 0.016 in.
Planetary gear 0.05 mm
reduction 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
KiSC issued 03, 2011 A
0.002 in.
W1155802