Section VIII. ELECTRICAL SYSTEM

TM 10-3930-631-12

Section VIII. ELECTRICAL SYSTEM

The main power fuse is 400 amps. Fuses rated at 15

4-20. General

amps protect the key switch, horn, lights and contactor

a. Refer to figure 1-3 for a schematic diagram of

circuits. The power steering motor circuit has a 35 amp

the electrical system.

fuse. A 400 amp fuse protects the hydraulic pump

b. The main components of the electrical system

circuit.

are the battery, which supplies the electrical power; the

CAUTION

controls, which control and distribute the power; the

instruments and the electric motors, which convert the

Before performing any electrical repairs

electrical energy into mechanical energy. The motors

on the truck, disconnect battery

power the drive axle and hydraulic pumps.

Discharge

c. Operational controls consist of a directional

capacitors by turning key switch on and

control and a speed control. The forward and reverse

depressing horn button.

lever allows the operator to select the direction of travel.

Speed control of the truck is maintained through a foot

4-21. Hourmeter and Switches

pedal or accelerator.

a. Removal. Remove sheet metal cover to gain

d. A key switch on the instrument panel opens and

access to hourmeter and switches. Refer to figure 4-3

closes the circuits to operate the truck. An hourmeter

and remove the hourmeter and switches.

installed on the instrument panel records elapsed

b. Installation. Refer to figure 4-3 and install

running time of the truck drive and hydraulic pump

hourmeter and switches.

motors.

e. All circuits on the truck are protected by fuses.

4-8