Kubota B1620 Workshop Manual

ELECTRICAL SYSTEM
B1220, B1620, B1820, WSM
9-S43
(EU)
[3] SERVICING
(1) Starter
Commutator and Mica
1. Check the contact face 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, correct the
commutator on a lathe to the factory specification.
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.
9Y1210272ELS0059US0
Brush Wear
1. If the contact face of the brush is dirty or dusty, clean it with
emery paper.
2. Measure the brush length (A) with vernier calipers.
3. If the length is less than the allowable limit, replace the yoke
assembly and brush holder.
9Y1210272ELS0060US0
Brush Holder
1. Check the continuity across the brush holder and the holder
support with an ohmmeter.
2. If it conducts, replace the brush holder.
WSM000001ELS0036US0
Commutator O.D.
Factory specification
28.0 mm
1.10 in.
Allowable limit
27.0 mm
1.06 in.
Difference of O.D.'s
Factory specification
Less than
0.02 mm
0.0008 in.
Allowable limit
0.05 mm
0.0020 in.
Mica undercut
Factory specification
0.60 mm
0.024 in.
Allowable limit
0.20 mm
0.0079 in.
(1) Segment
(2) Undercut
(3) Mica
(a) Correct
(b) Incorrect
Brush length (A)
Factory specification
14.0 mm
0.551 in.
Allowable limit
9.0 mm
0.35 in.
Resistance
Brush holder –
Holder support
Infinity
KiSC issued 07, 2011 A

Kubota B1620 Specifications

General

Engine Type	Diesel
Cylinders	3
Fuel Type	Diesel
Hydraulic System Type	Open center
Drive	4WD
3-Point Hitch Category	Category I