Isuzu A-4JB1 Repair Manual

ENGINE ELECTRICALS
YOKE
Field Winding Ground Test
Use a circuit tester to check the field winding ground.
1. Touch one probe to the brush field winding end.
2. Touch the other probe to the bare surface of the
yoke body.
There should be no continuity.
If there is continuity, the field windings are grounded.
Repair or replace the field windings.
Field Winding Continuity Test
Use a circuit tester to check the field winding continuity.
1. Touch one probe to the field winding lead wire.
2. Touch the other probe to the brush.
There should be continuity.
If there is no continuity, the field windings are open.
Repair or replace the field windings.
BRUSH AND BRUSH HOLDER
Brush Length Measurement
Use a vernier caliper to measure the brush length.
If the measured value exceeds the limit, the brush and/
or the yoke must be replaced.
Brush Length mm(in.)
Standard Limit
20.0 (0.79) 13.0 (0.51)
156

Isuzu A-4JB1 Specifications

General

Brand	Isuzu
Model	A-4JB1
Category	Engine
Language	English