Table of Contents
Advertisement
CHAPTER 6.
ELECTRICAL
6-1. STARTER
A.Armature
If the commutator surface is dirty, clean
1.
with #600 grit sandpaper as shown in the
drawing below.
After sanding,
wash thoroughly with
electrical contact cleaner and dry with
high-pressure air steam.
The mica insulation between commutator
2.
segments should be 0.5 - 0.8 mm (0.02-
0.03 in). below the segment level. If not,
scrape to proper limits with appropriately
shaped tool. (A hacksaw blade can be
ground to fit).
Each commutator segment should show
3.
zero ohm resistance to the others and at
least 3Ma resistance to the core. If there
is less than 3MR resistance to the core, or
one of segments is open, replace the
armature.
In addition, the armature can be placed
on a
"growler" (testing device) and
checked magnetically for internal shorts.
Follow manufacturer's test recommenda-
tions.
4.
If the commutator surface shows heavy
scoring, it can be turned down on a lathe
or commutator turning machine. Check
the specification chart for minimum
allowable commutator diameter. Recut
the mica after.
NOTE:
Should turning be required, check the
condition of the cover bearings, armature
electrical properties starter amperage draw
and rpm and, finally, carbon brushes.
B. Yoke
If the yoke area is dirty, clean with clean
1.
solvent and dry with high-pressure air.
2.
Yoke coil resistance is 0.05 ohm.
The coil should be show zero ohm resist-
ance, if it shows more than zero ohm,
replace it.
If the yoke shows leakage to ground (re-
sistance is less then 100 kn) replace it.
NOTE:
Immediately after cleaning, the yoke may
show some insulation leakage. Wait for it
to thoroughly dry before checking or re-
installing.
C. Starter relay switch
1. Inspection
a. Disconnect starter relay leads at the relay.
b. Connect pocket tester leads to the relay
terminals (ohm x 1 scale).
c. Turn ignition ON ("1" position) and
engine stop switch to "RUN".
d. Push starter button. The relay should
click once and the scale should read zero
ohm. If the relay clicks but the scale does
not read zero, the relay must be replaced.
e.
If the relay does not click, check the wires
from the starter button and the battery
(red/white, blue/white). Turn ignition off.
Use (ohm x 1) scale on tester. The re-
sistance between these wires should be no
more than 3.5n. If there is more
sistance, the relay should be replaced.
50 -
i
re-
Advertisement
Table of Contents
