Figure 3-85. Brush location.

Caution: Lift armature straight up carefully to

avoid damage to commutator or core.

(6) Remove screws (19) and lock washers

(20) securing rear end plate (21) to stator (41).

Attach chain to rear end plate and, with chain hoist.

lift armature. bearings, retainer and end plate_ lip and

out of stator. (fig. 3-87.)

(7) Remove shaft key and remove end plate.

(8) Bend the tabs of the bearing lock washer

123. fig. 3-86) down then, using a spanner wrench,

remove the lock nut (22).

(9) Using a gear puller with a shaft protector,

remove the retainer (29) from the armature shaft.

The seal and bearing will come off with the retainer.

(fig. 3-88.)

(10) Remove the bearing from the retainer.

Note Bearing is of the single shield type and can

be regreased. All old grease should be removed from the

bearing and the bearing thoroughly, washed out. Check

the bearing for running smoothness and replace if any

roughness is in evidence. Repack bearing only half full

with grease. Grease the bearing according to LO 10-

3930-620-12.

Caution: Overgreasing

bearing

will

cause

overheating, so care must be taken to make certain

grease cavity is packed only half full.

When

Figure 3-85. Brush location.

reassembling make certain shield faces outward. (11)

c. Removal. To remove the drive motor without

Remove and inspect retainer preformed packing.

removing the drive axle assembly, refer to paragraph 2-

Replace seal if worn or damaged. Seal is a light press

22. To remove the drive motor and drive axle assembly

fit.

as a unit, refer to paragraph 2-23.

Note. Bearing retainer with seal must be

d. Motor Disassembly. (fig. 3-86.)

installed on shaft before installing bearing.

(1) Place the drive motor in a clean working

(12) Remove and replace commutator end

area.

bearing if worn or damaged as it is a sealed type and

(2) Remove seat brake lock nut, drum, hub,

cannot be lubricated.

brake assembly, and woodruff key from shaft.

(13) Remove fan by applying a steady

(3) Remove rear cover (1) from around stator

amount of pressure against the back side of the fan.

(3), remove brush retaining screws (9), lift brush

The fan is hand pressed on against a key, angled up on

retaining springs (81 and withdraw brushes (10) from

the backside to prevent fan from being pressed on too

brush holders (14).

far and causing possible damage to armature windings.

(4) Place motor on end with drive end up.

(14) Remove end cover capscrews and

Caution: Use extreme care whenever using a gear

remove end cover and rocker arm assembly.

puller or center of shaft will be damaged. An

improper

(15) Field coils should not be removed unless

puller will flare out shaft center, damaging threads to the

replacement is required. To remove, loosen slotted

extent of requiring a new armature shaft. Use a shaft

screws securing pole shoes to stator, remove shims

protector in conjunction with the gear puller.

behind pole shoes, noting quantity and location of the

(5) Remove cotter key, nuts, pinion

shims and remove screws, pole shoes, and coils. (fig.

gear, and key from armature shaft. Use a gear puller to

3-89.)

remove the pinion gear.

Caution: Handle field coils carefully to avoid

damaging insulation.

e. Specifications.

H.P...................................................................... 8.33

RPM.................................................................... 1080

Volts.................................................................... 36

Amps .................................................................. 200

Duty .................................................................... 1hr

Service Factor .................................................... 1.0

3-96