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TM 10-3930-632-34
a.
e.
Match-mark the drive housing (28), field frame
Check the brush holders for distortion, cracks,
and winding assembly and commutator end frame (29)
breaks, or other damage.
f.
Inspect  the  drive  assembly  for  cracks,
to assure that the engine starter components will be
assembled in the same positions from which they were
damaged pinion teeth, breaks, clutching action, or other
removed.
damage: replace the drive assembly if any parts are
b.
Remove thru bolts (12).  Separate the end
damaged.
g.
If removed, replace the bushing in the drive
frame (29) and field frame from the drive housing (28) by
tapping them off with a plastic hammer.
housing. Replace the brush springs if brush tension is
c.
Do not remove the bushing (27) from the drive
not to specification.
housing unless it is damaged and requires replacement.
If defective, drive or press it from the housing.
5-11.
Reassembly
d.
Before disassembling the brush holders (14)
Refer to figure 5-2 and reassemble the engine
and springs, check brush spring tension with a spring
starter. Note the following:
scale. Spring tension shall be 35 ounces minimum. If it
is less than 35 ounces, disassemble the brush holders
a.
To install the drive assembly (26), coat the
and springs.
armature shaft with light engine oil and install the drive
e.
To remove drive assembly (26) from the
assembly on the shaft. Position the collar (23) on the
armature shaft, install l/2 inch pipe coupling on the end of
shaft. With the armature shaft in a vertical position and
the armature shaft so that it engages the outer collar
the end resting on a wooden block, place the retaining
(25). Rest the opposite end of the armature shaft on a
ring on the end of the shaft and force it onto the shaft by
wooden block and tap the end of the pipe coupling so
placing a wooden block on it and pounding on the
that it disengages the retaining ring (24) from the groove
wooden block.  Force the retaining ring into the ring
in the armature shaft.  Remove the collar (25) and
groove in the shaft.
remove the retaining ring from the shaft with a pliers.
b.
Position the second collar (25) on the shaft.
Slide the collar (23) and drive assembly (26) from the
Use two pairs of pliers to squeeze the collars together,
shaft.
forcing the collar (23) over the retaining ring.
c.
Make sure the fork (11) of the solenoid
WARNING
assembly (5) engages the grooved portion of the drive
assembly (26).
d.
Dry cleaning solvent, P-D-680, used to clean
Lubricate the bushings in the drive end
parts is potentially dangerous to personnel and
housing and the commutator end frame with engine oil
property.  Avoid prolonged and repeated skin
prior to installation.
contact.
Do not use near open flame or
excessive heat. Flash point of solvent is 100 F.
CAUTION
- 138 F. (39 C. - 59 C.).
When installing the armature in the field frame,
lift the brushes so that they pass over the end of
the commutator.
5-10.
Cleaning, Inspection, and Repair
a.
Clean the armature, field frame assembly, and
NOTE
solenoid switch assembly with a cloth lightly dampened
If brushes have been replaced, seat them using
in cleaning solvent P-D-680.
No. 00 sandpaper before assembling the end
b.
Clean all other parts of the engine starter,
frame.
Blow the brush particles off the
except the brushes, in cleaning solvent P-D-680 and dry
commutator so that they will not cause a short
thoroughly with compressed air.
circuit during operation.
c.
Check the size of the brushes; replace them if
they are less than one-half the length of a new brush.
e.
Align
the
match-marks
made
during
d.
Inspect  the  armature  commutator  for
disassembly to assure that the drive housing, field frame
roughness, out-of-round, or high mica. If any of these
and winding assembly, and commutator end frame will
conditions exist, turn the commutator down on a lathe
be installed in the same positions from which they were
and undercut the mica 1/32 inch. Remove only enough
removed.
stock to make the commutator smooth and round. After
f.
Check the pinion clearance after Reassembly
undercutting, finish the commutator with No.
00
by connecting the starting motor and a battery in the
sandpaper. Clean all particles off the commutator using
circuit (fig. 5-3). Disconnect the motor field lead from
compressed air.
the solenoid motor terminal.
CAUTION
Always blow particles off the commutator In the
direction away from the armature windings.
5-5

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