3
15
14
42
13
37
TURNING
AREA
36
TM 9-4940-568-34
5-144
5-23. STARTER MOTOR REPAIR (CONT).
(8)
Inspect drive end housing bushing (36) for
scoring or other damage. Replace damaged
bushing.
(9)
Check solenoid assembly (3) for cut or torn
boot. If boot is damaged, replace solenoid
assembly.
(10)
Inspect ball bearings (14), (15), and (42),
as follows:
(a)
Hold armature (13) and slowly rotate
outer bearing race by hand. Hold
outer edge of ball bearing (42) and
slowly rotate drive shaft (37) by hand.
(b)
Check that bearings turn freely
without binding or the feel of flat
spots.
(c)
Replace damaged bearings.
(11)
Inspect armature assembly (13) for gear
teeth that are broken, or that show evidence
of step wear or root interference.
(12)
Inspect armature assembly (13) for rough
commutator surface. Polish with No. 400
grit polishing cloth if necessary.
Thoroughly clean metal dust from between
commutator bars. If commutator surface
cannot be repaired in this manner, replace
armature assembly. Do not turn
commutator in a lathe.
(13)
Inspect armature assembly (13) for worn
commutator. Replace armature assembly if
commutator OD is less than 35 mm (1.378
in.) or if undercut depth at any point is less
than 0.2 mm (0.008 in.). Do not undercut
insulation.
(14)
Inspect drive shaft (37) for scored or
damaged shaft where it turns in drive end
housing bushing. Replace drive shaft if
damaged.
(15)
Inspect drive shaft (37) for internal gear
with teeth broken or showing evidence of
step wear. Replace drive shaft if damaged.
(16)
Inspect drive shaft (37) for damaged spline.
Clutch drive assembly must slide smoothly
and easily over full length of spline.
Replace drive shaft if damaged.
