Figure 4-13. Accelerator control box, installed view.

TM 10-3930-631-12

c. Pump Motor Brushes. Remove the drip pan

d. Accelerator Control. This control is located on

and acid tray. Remove rear band from the motor.

the front part of the frame to the left of the steering

Brushes will appear through inspection hole in the field

column. Remove the cover from the box to gain access

yoke (A, fig. 4-12). Inspect brush condition and

to the components. Inspect components as follows:

commutator for wear and damage. Check spring for

(1) Check potentiometer (fig. 4-13) for

cracks, damage, and unserviceable conditions. Install

secure mounting and operation.

rear band to motor. Install drip pan and acid tray.

Figure 4-13. Accelerator control box, installed view.

(2) Check actuator and arm for proper

panel. To inspect the switch, remove cover from box

operation. Depress accelerator and observe operation of

(fig. 4-3). Inspect switch for secure wiring and damage.

speed potentiometer.

Install cover on box.

(3) Inspect return spring for cracks and

f. Harness Wiring. Inspect the wiring harnesses

damage. Operate accelerator and observe action of

for damage, broken wires, damaged insulation, loose

return spring.

terminals, and insecure mounting. Repair and tighten

e. Forward and Reverse Switch. The forward and

terminals. Tape or cover damaged insulation. Connect

reverse switch is mounted in a box below the instrument

broken wires, if possible. Tighten mounting clamps and

4-18