TM 9-2320-266-34
15-3. Cleaning the Starter Parts.
Do not immerse starter parts in solvent.
The starter-clutch outer housing, brush plate, and
pinion gear may be cleaned with a cloth moistened with
cleaning solvent. Wipe dry with a clean, dry cloth. Clean
the terminal contacts and the contactor with crocus cloth.
15-4. Testing the Armature.
a. Testing for Short Circuit. Place the armature in a
growler, and slowly rotate it while holding a thin steel
blade above and parallel to the core. A shorted armature
Figure 15-17. Removing Clutch Assembly.
will cause the blade to vibrate and be attracted to the core.
Replace the armature if it is shorted.
b. Testing for Ground. Connect a pair of test lamp
probes to each of the commutator riser bars and the
armature shaft. If the lamp lights up, the armature is
grounded. Replace a grounded armature.
c. Testing Commutator Runout and Refacing. Place
the armature in a pair of "V" blocks and measure both the
shaft and the commutator for runout using a dial indicator.
A bent shaft means the armature must be replaced. When
commutator runout exceeds 0.004 inch, remove enough
metal to provide a smooth, even surface. Clean the commu-
tator grooves and retest (a and b, above).
15-5. Testing the Field Coils for Ground.
a. Remove the field frame assembly from the starter.
b. Drill out the rivet attaching the field coil ground
leads to the field frame.
c. Insulate the field coil leads from the field frame.
d. Test for ground using the growler test lamp. Touch
one probe of the test lamp to the field coil lead and the
other probe to the field frame. The lamp should not light.
If it does, the field coils are grounded and require replace-
ment.
e. The field coils are replaced as part of the field-frame
assembly.
Figure 15-18. Removing Solenoid Cord.
15-6. Servicing the Starter Bushings.
Inspect the armature shaft bearing, the pinion shaft
surfaces, and the bushings for wear. Insert the bushings in
the shafts and test for side play. This indicates wear on the
bushings. Remove and replace any worn out bushings using
appropriate adapters. The end head and bushing are ser-
viced as an assembly. Pre-sized starting motor bushings are
available as service bushings; no burnishing or reaming is
required to fit them. Use a brass drift to install.
Figure 15-19. Removing Shifting Fork Pin.
15-5
