Generator - Battery Charging

TM 5-6115-400-35

on end bell. Install end bell assembly with assembled

(1) Clean the armature and field windings of

brush holder assembly on commutator and install

any dirt or magnetized particles.

brushes. Install flat washer on armature shaft and install

remove grease and oil, apply a light coat

armature and end bell as a unit into frame.

of a safety type petroleum solvent such as

j. Adjusting Drive Clutch Pinion Clearance.

MILT-6003, with a brush. Wipe clean,

then use compressed air to remove any

(1) Remove plug.

remain 30 ing dirt film. Do not use any

(2) With starter pinion in engaged position,

degreasing compounds or submerge the

press clutch inward lever to take up slack.

armature in a degreasing tank as this

(3) Adjust hex self-locking nut until clearance

would damage the insulation.

between outer face of pinion and inner

(2) Clean the commutator with 00 sandpaper

face of housing overhand is 23/64 inch +

and

remove

sand

particles

with

1/32 inch.

compressed air.

k. Installation. Refer to TM 5-6115-400-12.

(3) Clean the commutator end frame, drive

32. Generator - Battery Charging

end frame, and components with an

a. General. The generator is a 24-volt 18ampere

approved solvent and dry thoroughly.

type mounted on the front of the engine. It is fungus

Caution. Do not soak insulators

and corrosion resistant and is arranged for "B" type

circuit with the field grounded inside the generator.

f. Inspection and Repair.

b. Removal. Refer to TM -6115-400-12.

(1) Inspect the commutator for roughness,

c. Bench Testing. To check the generator for

high mica, loose winding, burrs, or pits.

electrical output, connect an ammeter in series with a

Smooth the commutator with 00

battery to the generator output terminal. Also connect a

sandpaper or undercut on a lathe.

voltmeter from the generator output terminal to ground,

Replace the armature if the commutator

and a load rheostat across the battery. Connect a

bars are less than 1/16-inch thick after

jumper lead to the generator field terminal as shown in

undercut. Undercut the mica between the

figure 9. operate the generator at 1,775 r.p.m., and

bars to a depth of 1/32-inch.

adjust the lead rheostat to obtain a reading of 18

Caution. Do not widen commutator

amperes on ammeter, and 28.5 volts on voltmeter. If

slots by removing metal from bars

the generator will not meet these conditions, it should be

when undercutting. Use only solder

disassembled for further testing.

with a rosin core flux.

d. Disassembly.

Refer to figure 10 and

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

disassemble the generator.

bends, corrosion, or breaks.

e. Cleaning.