Section II. STARTER MOTOR - TM-10-3930-621-340093

TM 10-3930-621-34

into the holes at the Bottom of the holder to retain the

e. Remove tape from bearing (24) and slip ring end

brushes.

of rotor shaft (13). Make sure bearing and shaft are

completely clean.

f. Install bearing (24) and retainer (1) in slip ring

end frame, noting carefully, proper alinement of parts.

frame (2).

Allow wire to protrude through hole in end frame.

g. Using scribe marks as a guide, install stator

5-6. Output Testing

assembly (11) on slip ring frame (2).

Refer to TM 10-3930-621-12 for testing the voltage

h. Using scribe marks as a guide, install stator and

output of the alternator.

slip ring frame assembly on the drive end frame (27).

5-7. Assembly

i. Secure all frames with four thru-bolts (23).

a. Refer to figure 5-1 and assemble as follows:

j. Withdraw the brush retaining wire through a hole in

b. Place rotor assembly (13) in vise, avoiding

the end frame, allowing the brushes to contact the slip

excessive tightening.

rings.

c. Install rotor shaft assembly (13) on drive end

5-8. Installation

frame (27).

Refer to TM 10-3930-621-12 for alternator installation

d. Install fan pulley assembly tightening shaft nut to 50-

procedures.

foot-pounds.

Section II. STARTER MOTOR

necessary to make repair or replacement of defective

5-9. Description

parts.

Starter motor is a two field, four brush unit, with armature

b. Refer to figure 5-5 for referenced item numbers.

supported by three bushings one each at drive end,

c. Secure starter motor in bench vise at drive end of

center and commutator end.

These bushings are

unit. Be careful not to damage drive end housing.

graphite and oil impregnated and are lubricated only

Remove the two thru-bolts (35) and slide

when motor is disassembled.

The two brushes

commutator end frame (38) and field frame from

connected to field coil leads are insulated in commutator

armature.

end frame and the two ar- mature brushes are grounded.

e. Disconnect field lead from brush holder (6) and

The starter motor is designed to operate under overload

remove commutator end frame from field frame.

and produce high torque. The starter drive assembly

f. Brushes, brush holders and springs can now be

incorporates a locking feature, which prevents

demeshing of drive pinion from flywheel ring gear until a

removed from commutator end frame.

g. Remove screws (21) which mount center bushing

specific flywheel speed is reached.

(28) on drive end housing (24) and remove housing from

5-10. Removal

armature shaft.

Refer to TM 10-3930-621-12 for starter motor removal

h. Drive assembly (19) is keyed onto armature shaft

procedures.

and is removed by pressing off or using a puller.

5-11. Disassembly

a. Disassembly should proceed only as far as is

5-5