TM-9-2920-242-35
STARTER, ENGINE ELECTRICAL, ASSEMBLY MODEL 1113943, 1113904 AND 1113944
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE INCLUDING REPAIR PARTS
SEPTEMBER 1964
TM-9-2920-242-35 - Page 16 of 110
Malfunction
1.
Starter fails to
operate or turns
slowly.
Table I. Troubleshooting
Probable causes
a.
Starter frozen.
b.
Defective solenoid relay.
c.
Worn brushes or defective
springs.
d. Worn or pitted commutator.
e.
Eccentric commutator.
f.
Shorted or grounded com-
mutator.
g.
Grounded field coils.
Corrective action
a.
b.
c.
d.
e.
f.
g.
Disassemble starter
(par. 18) and check for
cause.
Check for operation of
solenoid by placing a
jumper across battery
terminal and solenoid
switch terminal. If
solenoid does not
operate, replace sole-
noid relay (pars. 18
and 35).
Remove commutator end
plate (par. 18c) and in-
spect brushes. Check
brush spring tension (fig.
10). Install new brush
kit if parts are defective
(par. 35c).
Remove commutator end
plate (par. 18c and in-
spect commutator. Re-
surface commutator
(par. 27d ) or replace
armature (par. 35c) if
it cannot be recondi-
tioned.
Remove armature (par.
18c) and check runout
(fig. 22). Resurface
commutator (par. 27d )
or replace armature
(par. 35c).
Remove commutator end
plate (par. 18c) and
check for evidence of
excessive arcing. If arc-
ing is evident, remove
armature and check for
grounds (fig. 20) or
shorts (fig. 21). Replace
armature, if defective
(par. 35c).
Inspect field coils (par.
26i). Replace coils if
defective (par. 30).
7
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