Starting System Inspection And Repair; Armature - Isuzu NHR 4J Series Workshop Manual

6D2 – 8 STARTING SYSTEM
INSPECTION AND REPAIR
Make necessary correction or parts replacement if wear,
damage or any other abnormal condition are found
through inspection.

ARMATURE

Check the commutator for run-out and replace if the
amount of run-out exceeds the limit.
Run-out test
kw
2.2
2.0
6D2-8-1.tif
Check the mica segment for wear.
Depth of mica segment
kw
2.2
2.0
6D2-8-2.tif
Check the commutator outer diameter.
Commutator outer diameter
kw
2.2
2.0
6D2-8-3.tif
Armature short circuit test
Check the armature for short circuit by placing it on a
growler tester. Hold a piece of hacksaw blade against the
armature core while slowly rotating the armature. A short-
circuited armature will cause the blade to vibrate and to be
attracted by the core. If the hacksaw blade is attracted or
vibrates, the armature, is short circuited, and must be
replaced.
6D2-8-4.tif
Standard
0.02 (0.0008)
Standard
0.7 - 0.9 (0.028 - 0.035)
Standard
35.00 (1.378)
mm (in.)
Limit
0.05 (0.0020)
mm (in.)
Limit
0.20 (0.008)
mm (in.)
Limit
34.00 (1.339)