Inspection and Repair. - TM-5-2410-233-340168

operation. Inspect for exessive side play and

c. Inspection and Repair.

damaged surfaces.

(1) Inspect the commutator for roughness.

(12) Inspect the generator field frame for

high mica, loose winding, burrs, or pits. Smooth the

breaks, cracks, and damaged threads.

commutator with 00 sandpaper or undercut on a

(13) Inspect all hardware for damaged

lathe. Replace the armature if the commutator bars

are less than 1/16 inch thick after undercut.

threads.

(14) Replace or repair all defective parts as

Undercut the mica between the bars to a depth of

necessary.

1/32-inch.

f. Assembly. Reassemble generator in direct

CAUTION

reversal of disassembly. Seat brushes using a

Do not widen commutator slots by

removing metal from bars when un-

seating hone or sandpaper wrapped around

commutator. Clean commutator thoroughly and

dercutting. Use only solder with a rosin

complete assembly.

core flux.

(2) Inspect the armature shaft for wear, pits,

5-21. Starting Motor

bends, corrosion, or breaks.

a. General. This electrical component is a

(3) Place the armature ends in V-blocks and

heavy-duty, 24-volt, submersion proof, fungus and

measure the commutator for out-of-round with a

corrosion resistant, solenoid-operated, enclosed

dial indicator. Turn down if in excess of 0.001 inch

shift-lever-type engine starter with eight brushes

out-of-round.

retained in four brush holders. The drive clutch is a

(4) Inspect for windings grounded to core

heavy-duty overrunning type a n d the pinion

with a continuity tester. Touch one probe of the

clearance is adjustable. The principal components

tester to the armature shaft and the other to each

of the starter are the frame, armature commutator

commutator riser. An indication of continuity

end plate assembly, brush holder assembly,

indicates the armature is grounded.

brushes, drive clutch assembly, drive housing, shift

CAUTION

lever, and solenoid plunger.

Do not touch the probes to the com-

b. Removal. Refer to TM 5-2410-233-20.

mutator bars or shaft bearing surfaces

c. Starter Disassembly.

as arcing may score the smooth surface.

(1) Scribe marks across drive housing ((1041,

(5) Inspect for open windings with a test

fig. 5-36), lever housing (84), frame assembly (45),

lamp. Touch the probes to a pair of adjacent

to facilitate reassembly in the correct relationship.

commutator risers. Failure of the lamp to light

(2) Remove five socket head capscrews (100)

indicates an open winding.

and one socket head capscrews (99) and pull drive

(6) Inspect for shorts with a growler and steel

housing assembly from starter. Remove gasket

strip. The steel strip will vibrate against the ar-

(go).

mature over a shorted area as the armature is

(3) Disassemble housing assembly only if

turned.

parts require replacement. Press out sleeve bearing.

(7) Inspect the field windings for worn or

Remove pipe plugs, expansion plug, and wick.

frayed insulation, defective connections, opens, and

(4) Loosen terminal screw on solenoid relay

field current draw.

and disconnect terminal of lead (37). Remove hex

( 8 ) Inspect end frames for cracks and

nut and remove lead.

damaged or worn bearing surfaces.

(5) Remove plugs (13) and gaskets (12).

(9) Inspect brush plate for cracks and loose

Remove brush and field coil connection and at-

rivets. Inspect insulated brush holders for grounds.

taching screws from each of the holes. Mark screw

(10) Inspect brush springs for tension and

holes to identify them during assembly of brushes.

signs of breaks or other damage. Replace brushes.

(11) Inspect the ball bearings for smooth

5-44