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 51 of 110
TM 9-2920-242-35
Section V. TESTING
37. GENERAL
Whenever a starter is tested check for any
unusual noises or vibration that might indicate an
unserviceable condition. If either condition exists,
further testing should not be attempted and the
starter must be disassembled and repaired.
38. NO-LOAD TEST AND LOCK TORQUE TEST
Caution: Never operate the starter motor
mo e than
r
30 seconds at a time. Allow the motor
to cool for at least 2 minutes between each
cranking cycle. Overheating, caused by excessive
cranking, will seriously damage the starter motor.
a.. No-Load. (fig. 40).
FIGURE 40. NO-LOAD TEST WIRING
DIAGRAM.
(1) Connect a 24-volt battery in series with an
ammeter and variable resistance to the
(2)
battery terminal of the solenoid.
For the return circuit, connect a lead from
the frame of the starter to the battery.
Connect a voltmeter from the solenoid
“BAT” terminal to ground. Energize the
solenoid by connecting a jumper lead
from the solenoid battery terminal to the
solenoi
d switch terminal.
Check the
rotation speed of the armature with a
tachometer. Obtain the specified voltage
(23.0 volts) by varying the resistance unit.
Minimum
Check the
Maximum
amperes.
speed should be 7000 rpm.
current draw on the ammeter.
current draw should be 90
If a low speed, high current condition exists,
check the armature for excessive
arching, grounds, and shorts (par. 26d).
Examine starter for armature drag. If
drag exists, check for loose pole shoe
screws (fig. 18) and tighten as necessary.
Check for armature eccentricity (par. 26d)
or faulty bearings.
(3) If a low speed, low current condition
exists
,
inspect the starte
r for faulty
connections and for poor brush contact fig.
35).
b.
Lock–Torque Test. DELETED
42
Change
5
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