Cleaning, Inspection, and Repair - TM-10-3930-632-340055

TM 10-3930-632-34

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.

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

Remove thru bolts (12). Separate the end

damaged.

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

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

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

To install the drive assembly (26), coat the

and springs.

armature shaft with light engine oil and install the drive

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.

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.

Make sure the fork (11) of the solenoid

WARNING

assembly (5) engages the grooved portion of the drive

assembly (26).

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

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

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.

Check the size of the brushes; replace them if

they are less than one-half the length of a new brush.

Align

the

match-marks

made

during

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

Check the pinion clearance after Reassembly

undercutting, finish the commutator with No.

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