Removing Retainer From Slip Ring; Brushes And Brush Holders; Armature Windings; Field Windings - Jeep J-10 Series 1982 Technical & Service Manual

1F-6 STARTING SYSTEMS
Disassembly
The following procedure should be used to dis
assemble and reassemble the starter motor. Component
inspections are also included. Refer to figure 1F-2 and
proceed as follows:
(1) Disconnect field winding connection from sole
noid terminal.
(2) Remove through-bolts.
(3) Remove commutator end frame and field frame
assembly.
(4) Remove armature assembly from drive housing.
Remove solenoid and shift lever assembly from drive
housing before removing armature assembly.
(5) Remove thrust collar from armature shaft.
(6) Remove pinion gear from armature by sliding
metal cylinder onto shaft and by striking metal cylinder
against retainer with hammer. Drive retainer toward
armature core and off snap ring (fig. 1F-5).
(7) Remove snap ring from groove in armature
shaft.
1/2 IN. PIPE
COUPLING
90811
Fl|. 1F-5 RfBovIng Riiilnw From Slip Ring
(8) Roller type clutches are designed to be serviced
as a complete unit. Do not disassemble, replace if
necessary.
Component Inspection
• Brushes and Brush Holders—Inspect the brushes
for wear. If they are worn excessively when com
pared with a new brush, they should be replaced.
Ensure the brush holders are clean and the brushes
are not binding in the holders. The complete brush
surface should ride on the commutator for proper
operation. Check by hand to ensure that the brush
springs are providing firm contact between the
brushes and commutator. If the springs are dis
torted or discolored, they should be replaced.
•Armature Windings—Commutators should not
have the insulation undercut, and out-of-round com
mutators should not be turned in a lathe. The arma
ture windings should be tested for internal short
circuits, open circuits, and shorts to ground:
(1) Internal short circuits are located by rotating
armature in growler with steel strip (e.g., hacksaw
blade) held above armature. Steel strip will vibrate
when at area of short circuit. Short circuits between
commutator bars are sometimes caused by brush dust
or copper imbedded between bars. Cleaning dust and
copper out of bars may eliminate short circuits.
(2) Open circuits can be located by inspecting con
nections joining armature windings to commutator bars
for looseness. Loose connections cause arcing and burn
ing of commutator bars. If bars are not badly burned,
winding connections to bars can be resoldered.
(3) Shorts to ground in armature windings can be
detected by use of test lamp. If lamp lights when one
test probe is placed on commutator bar and the other
test probe on armature core or shaft, armature winding
is shorted to ground. Test all windings.
•Field Windings—The field windings should be
tested for shorts to ground and open circuits with a
test lamp. The field winding circuit is illustrated in
figure 1F-1.
(1) Shorts to grounds—Disconnect field winding
ground connection. Connect one test lamp probe to mo
tor frame and other to field winding connector. If lamp
lights, field windings are shorted to ground and must be
repaired or replaced. If windings are not shorted, recon
nect winding to ground. This test cannot be made if
ground connection cannot be disconnected.
(2) Open circuits—Connect test lamp probes to
frame and field winding connector. If lamp does not
light, field windings are open. If field windings are
found to be defective, frame and field winding assembly
must be replaced. Windings cannot be replaced sepa
rately because of integral frame construction.
• Solenoid—A basic solenoid circuit is diagramed in
figure 1F-1. Solenoids can be tested electrically by
connecting a battery of the specified voltage, a
switch, and an ammeter to the two solenoid wind
ings. With all wires disconnected from the solenoid,