CHAPTER 8 REPAIR OF ELECTRIC MOTORS

TM 10-3930-631-34

CHAPTER 8

REPAIR OF ELECTRIC MOTORS

Section I. DRIVE MOTOR

8-1. Description

a. The drive motor is a flange mounted, direct

current series wound motor. The armature has a

replaceable shaft with a sealed bearing at the

commutator end and a double row thrust bearing at the

drive end.

b. Dual metal graphite brushes are supported in

fixed box type holders to assure proper brush alinement.

A metal clip on top of each brush forms a stop device

that prevents commutator scoring.

8-2. Repair of Drive Motor

a. Brush Replacement.

(1) Remove the floor and toe plates. Remove

drip pan.

(2) Disconnect the battery receptacle and

discharge the capacitors.

(3) Remove rear cover from drive motor.

Remove brush retaining screws (fig. 8-1). Lift brush

springs (fig. 8-1) and remove brushes from holders.

Figure 8-1. Drive motor brush location.

8-1