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 ELECTRICAL
dirty commutator, weak or broken
bent armature shaft or loose field pole screws which
brush springs, worn brushes, high
would allow the armature to drag.
mica on the commutator or other
causes which would prevent good
(2) Shorted
armature:
Check
contact between the brushes and
armature further on growler.
commutator.
(3) Grounded armature or field:
f.
High free speed with low-developed
Check by raising grounded or return
torque and high current draw indicates
brushes and insulating them from the
shorted fields. There is no easy way to
commutator with cardboard and then
detect shorted fields, since the field
checking with a test lamp between the
resistance is already low. If shorted fields
insulated terminal and the frame. If
are suspected, replace the fields and check
test lamp lights, raise other brushes
for improvement in performance.
from commutator separately to
determine whether it is the fields or
J. INSTALLATION
armature that is grounded.
1.
Place the cranking motor in position against
c.
Failure to operate with high current
the flywheel housing. Secure it with bolts, nuts and
draw:
(1) A direct ground in the switch,
2.
Connect: the cable to the solenoid, the wires
terminal or fields.
to the solenoid and the ground cable to the battery.
(2) Frozen shaft bearings which
K. SOLENOID MAINTENANCE
prevent the armature from turning.
1.
Solenoids require no periodic maintenance
d.
Failure to operate with no current
other than keeping the terminals clean and tight.
draw:
Always check action of solenoid if it has been removed.
(1) Open circuit: The open circuit
2.
If unit fails to function, first check wiring
may be in the fields, armature, at the
before condemning the solenoid.
connections or brushes, or between
the brushes and commutator. Trace
3.
Solenoid coil, terminals, and switch plunger
the circuit with the test lamp.
can be replaced if burned or otherwise damaged.
e.
Low no-load speed, with low torque
and low current draw:
DISTRIBUTOR (Fig. 2)
(1) An open field winding. Raise
A. REMOVAL
and insulate ungrounded brushes
from commutator and check fields
Remove the distributor cap, coil to distributor wire, and
with test lamp.
distributor mounting nut. Note location of rotor in
relation to distributor
(2) High internal resistance due to
poor connections, defective leads,
B-81
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