Servicing - Kubota Z400-B Handbuch

SERVICING
Commutator and Mica
1. Check the contact face of the commutator for wear, and
grind the commutator with sand paper if it is slightly
worn.
2. Measure the commutator a.D. at several points.
3. If the difference of the a.D.'s exceeds the allowance limit,
correct the commutator on a lathe to the factory specifi­
cation.
4. If the minumum a.D. is less than the allowable limit,
replace it.
5. Measure the mica undercut.
6. If the undercut is less than the allowable limit, correct
with a saw blade and chamfer the segment edges.
0.0.
Factor spec.
Allowable limit
30.0 mm
1 .1811 in.
29.0 mm
1.1417 in.
Difference of
0.0.'5
i
Mica undercut
Factory spec.
Allowable limit
Factory spec.
Allowable limit
less than 0.1 mm
0.004 in
0.4 mm
0.016 in.
0.5 to 0.8 mm
0.020 to 0.031 in.
I
g:~O~~n.
(a) Bad
(b) Good
(1) Mica
(2) Segment
ial
ib)
(3) Depth of Mica
C022H)5H
-~:
S·149