Section IX. BRAKES - TM-10-3930-631-120046

TM 10-3930-631-12

ties, if necessary.

loose wires and damage.

g. Thermal Relays.

Inspect thermal relays for

Section IX. BRAKES

drive motor and conserve battery current. The switch is

4-30. General

a normally open switch and is closed when the brake

a. Brakes on the fork lift truck consist of two

pedal is depressed. Closing the switch bypasses power

systems: a seat operated parking brake, on the drive

from the speed control potentiometers. This halts

motor shaft and service brakes on the two front wheels.

powered movement of the truck.

b. The parking brake is a dual-shoe mechanical

operated type. Actuation of the brake is accomplished

4-31. Parking Brake Linkage and Caliper Assembly

through a linkage connected to the hinged Operator's

a. General. The parking brake linkage extends

seat. When the operator leaves the seat or stands up,

down from the lower right side of the operator's seat.

removing his weight from the seat, the brake is applied.

Remove sheet metal cover from right side below seat to

A spring at the lower end of the linkage expands and

gain access to linkage. Elevate truck with jacks and

moves the brake actuating lever which forces the brake

block in position. Remove drip pan from bottom of truck

caliper against brake disk. This pressure keeps the shaft

to gain access to lower part of linkage.

from rotating, locking the front wheel and holding the

b. Removal. Refer to figures 4-14 and 4-15 and

truck in position. A seat switch is actuated by the linkage

remove the brake linkage.

when the seat is raised or lowered. The switch is closed

when the seat is down. Raising the seat opens the

CAUTION

switch and removes power from all electrical circuits.

Carefully remove retainer from lower

c. The service brakes are hydraulically actuated

end of rod. Spring is under tension.

through a pedal and master cylinder. Depressing the

pedal operates the master cylinder sending hydraulic

c. Installation. Refer to figures 4-14 and 4-15 and

pressure to the wheel cylinders. The wheel cylinders are

install parking brake linkage. Refer to d below to adjust

the double end type and hydraulic pressure extends the

linkage.

ends of the cylinder, pivoting the brake shoes against the

d. Linkage Adjustment. Drive truck to a 15 degree

brake drum inside the wheel. The pressure in the

incline and remove weight from seat. Truck should

master cylinder also closes the stoplight switch and

remain stationary. If truck does not hold in position or if

interlock switch and operates the stoplight. When the

brake drags when truck is operated, adjust as follows:

pedal is released, springs return the pedal and brake

(1) Disconnect battery receptacle and block

shoes to the released position.

a wheel to prevent truck from rolling. Remove floor and

d. A brake interlock switch is employed in the

toe plates and drip pan.

electrical system to reduce the amount of load on the

4-19