Starter, Cleaning, Inspection and Repair

TM 10-3930-630-34

drive assembly must engage spiral splines on armature

4-7.

Starter, Cleaning, Inspection and Repair

shaft.

a. Clean all metal parts, except rubber or

(2) Install stop collar (31) and retaining

insulated parts, in cleaning solvent (Fed. Spec. P-D-

ring (30) on shaft. Press thrust washer (29) on shaft over

680). Dry parts thoroughly.

retaining ring.

b. Check armature for shorts on a growler.

(3) Install brake washer (32) on armature

(1) Place armature on growler. Check

shaft.

with a steel strip or hacksaw blade held on armature

(4) Install field winding (40) in housing

core.

(42). Install insulation (39) and pole shoes (38) in

(2) Rotate armature. If blade vibrates

housing between field winding coils. Pole shoes with

armature is shorted in area of core below blade.

long lip on side must be installed with lip in direction of

(3) Clean commutator slots.

armature rotation. Secure pole shoes with pole shoe

(4) If short cannot be eliminated, replace

screws (37).

armature.

(5) Install armature (28) in housing (42)

c. Check armature for opens.

with armature core between pole shoes.

(1) Inspect points where core conductors

(6) If bearing (35) was removed from

are connected to the commutator for loose connections.

housing (36), press new bearing into bore in housing.

Poor connections cause arcing and burning of

End of bearing must be flush with or slightly below end

commutator.

of bore.

(2) If commutator bars are not badly

(7) Install lever (27) in housing (36) and

burned, resolder leads to bars.

install stud (20) to secure lever. Secure stud with nut

d. Check commutator for out-of-round.

(18) and lock washer (19).

(1) If commutator is worn out-of-round, turn

(8) Check marks on lever housing (36)

commutator on a lathe.

and starter housing (42) and install housing (36).

(2) After turning commutator, undercut

Engage prongs on lever (27) with slot in drive assembly.

insulation between bars 0.031 inch (0.78mm).

(9) Install plunger (26) in housing and

e. Check field winding for grounds and opens

secure plunger to lever with pin (25).

with a test lamp.

(10) Slide solenoid (23) and spring (24)

(1) Connect test lamp probes to ends of

over plunger and up to housing. Secure solenoid with

field windings. If lamp does not light, field windings are

screws (21) and lock washers (22).

open and must be replaced.

(11) Install brushes (15) in brushholders

(2) To check for opens, after installation

(16 and 17). Secure brushes with screws (13 and 14).

of field windings, connect one probe of test lamp to field

(12) Install assembled brushholders on

winding connection and one to starter housing. If lamp

end frame (6) and secure with screws (11 and 12), lock

lights, field windings are grounded and must be repaired

washers (10) and nuts (9). Install springs (8) in

or replaced.

brushholders and against brushes. Connect ground lead

Check all springs for damaged or

(7) to brushes and frame.

weakened condition. Replace unserviceable springs.

(13) Hold brushes (15) apart and install

g. Inspect drive assembly for damage and

assembled end frame (6) on housing and armature.

wear to spring and gear. Replace unserviceable drive

Release brushes so that brushes contact armature

assembly.

commutator.

h. Inspect brushes. If brushes are worn to less

(14) Connect field winding leads to

than one-half of their original length, replace brushes.

solenoid (23).

Check brush springs. Spring tension on

(15) Secure housings together with

brushes must be 35 ounces (1.04 kg).

through bolts (5).

b. Pin ion Clearance Check.

4-8.

Starter, Reassembly and Installation

(1) Disconnect field winding connector

a. Reassemnbly.

from rear of solenoid and insulate connector.

(1) Install spring (34, fig. 4-9) and drive

(2) Connect a battery from the solenoid

assembly (33) on armature shaft. Spiral splines in

switch terminal to the solenoid frame as shown in figure

4-10.

4-7