Section IV. ELECTRICAL MOTORS

TM 5-3835-222-BD

d. Solder the intermeshed wires together. If a soldering iron is not available, the two intermeshed

ends may be secured with a screw clamp, cable clamp, or safety wire.

e. Insulate with tape.

Record the BDAR action taken. When the mission is completed, as soon as practicable, repair the

equipment using standard maintenance procedures.

Section IV. ELECTRICAL MOTORS

7-13. General. Repair on electric motors should be restricted to relays, solenoids and brushes.

Damage to casings and winding cannot be expediently repaired.

7-14. Brush, Electrical, Alternator/Starter-Motor, Worn. Many electrical motors use a carbon

compositon brush to transfer electrical energy to or from the armature commutators. The transfer

of energy creates an electrical arc which will burn the brushes. Arcing and normal friction will cause the

brushes to become worn and inefficient for electrical power transfer. The brushes can be sub-

stituted with the carbon core from a BA30 or BA31 battery. Care must be taken when opening

the battery, the contents are corrosive. Brush retaining springs can be used to transfer the energy

or to hold the old brush wires in place.

Limitations:

Shorter motor life.

Personnel/Time Required:

1-3 soldiers - 1.0 - 8.0 hrs.

Materials/Tools:

Hacksaw

Battery (BA30) (appendix C, section II, item 4) or (BA31) (appendix C, section II, item 5)

Sandpaper (appendix C, section II, item 30)

Other Options:

Modify and use other electrical brush sets.

Procedural Steps:

a. Gain access to motor.

b. Remove electrical brush plate.

c. Obtain a BA30 or BA31 battery.

d. Using a hacksaw or other available tool, split the battery open taking care not to damage the

carbon core.

e. Clean and cut the carbon core to fit the brush plate receptacles.

f. Insert the core into the brush plate and position the old brush wires under the retaining springs

to ensure electrical continuity.

7-10