(a) Remove item 1 through 12 as shown on
figure 14-11.
(3) Inspect all drive assembly splines and pin-
on teeth for nicks and burrs.
(4) Test field coils for insulation breakdown
with megger connected between frame and one coil
terminal. Minimum resistance reading permissible
is one megohm.
Replace starter assembly if coil is
defective.
(b) Lift packing (23) and knock out pin (13).
Remove cover (14).
(c) Disassemble the remaining parts in
accordance with index numbers 16 through 29.
(2) Disassemble frame and field coil assembly
as illustrated in figure 14-12.
(5) Inspect coil terminal lugs for damaged
threads.
(6) Test armature for grounds with a test light.
Touch a test light probe to the armature core and the
other probe to a commutator bar riser. If test light
glows, armature is grounded. Repeat test for all
commutator bars.
(3) Disassemble solenoid assembly as illustra-
ted in figure 14-13.
14-28. Cleaning and Inspection.
a. Cleaning.
(7) Test armature for short circuits using a
growler.
(1) Blow out all dirt from inside field frame
and wipe interior with a clean cloth.
(8) Check brushes for excessive wear.
CAUTION
14-29. Repair.
Do not submerge armature, field
coils, solenoid or clutch drive in
solvent.
a. Pinion Housing and Commutator End Head.
(1) Smooth minor scratches, burrs, and dents
on machined surfaces using a fine mill file.
(2) Clean field coils and frame thoroughly with
a cloth dampened with cleaning solvent Federal
Specification P-D-680.
Be careful not to damage
protective insulation and fungus coating. Dry thor-
oughly with compressed air.
(2) Repair damaged threads.
(3) Smooth minor rough spots, score marks,
and scratches from inside bore of bronze bearing
using a fine stone or crocus cloth dipped in cleaning
solvent, Federal Specification P-D-680.
(3) Remove loose particles from armature with
compressed air and wipe with a clean cloth dampened
with cleaning solvent.
Clean commutator lightly
with No. 00 sandpaper and remove all traces of dust
with low-pressure compressed air.
b. Brush Holder Assembly. Replace a defective
brush holder assembly.
c. Armature.
—
(4) Clean brush holders and springs with a
brush and cleaning solvent, Federal Specification
P-D-680, and dry them thoroughly with compressed
air. Clean insulation and plate with a clean cloth
dampened with cleaning solvent and dry with com-
pressed air.
(1) Resurface commutator removing no more
than 0.005 inch during any one cut and no more than
0.002 inch on final cut. Check that final diameter of
commutator is not less than 1.6470 inches.
(2) If commutator diameter is satisfactory,
undercut mica to a depth of 0.025 to 0.032 inch below
commutator surface.
(5) Clean solenoid relay assembly parts with a
clean cloth dampened with cleaning solvent, Federal
Specification P-D-680, and dry with low-pressure
compressed air.
NOTE
(6) Clean brushes with a clean, dry cloth only.
Do not permit cleaning solvent to come in contact
with the brushes.
Use care in undercutting. DO not widen
commutator slots by removing metal
from segments, and do not leave thin
edge of mica next to segment.
b. Inspection and Tests.
(3) After the mica has been undercut, remove
all copper and mica particles with compressed air.
Polish the commutator in a lathe with number 2/0
sandpaper while the armature is rotating at 1500
rpm. After polishing the armature, check that com-
mutator diameter is not less than 1.6470 inches.
Replace if diameter is less.
(1) Inspect drive assembly drive pinion for
broken, chipped, or badly worn teeth. Replace drive
assembly if defective.
(2) Inspect internal splines in drive assembly
shell and pinion for cracked, chipped, or broken con-
dition.
Replace drive assembly if defective.
14-19
