Parking Brake Linkage - TM-10-3930-628-120072

TM 10-3930-628-12

by an actuator attached to the brake pedal rod when the

yoke on rod. Turn yoke clockwise to shorten linkage

brakes are in the off position. When the pedal is

and provide more brake action or counterclockwise to

depressed the actuator moves off the switch roller, allow

provide less brake action.

ing the switch to open. This opens the directional circuit

(4) Connect yoke to switch actuator (fig. 4-14)

halting powered movement of the truck. The brake

and measure distance from back of seat to battery

pedal must move about one inch before the switch is

compartment cover. When seat is raised, distance

opened allowing operator to apply light pedal pressure

should measure between 41/2 to 51/2 inches. Adjust as

for inching the truck into position. When correctly

above to obtain distance.

adjusted, the brakes will begin to apply before the

(5) If above adjustment does not hold truck on

directional circuit is opened.

incline, adjust at lower end of linkage as follows:

(6) Loosen lock nut (fig. 4-15) and turn spring

4-32. Parking Brake Linkage

retainer counterclockwise to compress spring and

a. General.

The parking brake linkage

shorten linkage.

Recheck adjustment ((4) above).

extends down from the lower right side of the operator's

Tighten lock nut.

seat. Remove sheet metal cover from right side below

e. Switch Adjustment. If switch (fig. 4-14)

seat to gain access to linkage. Elevate truck with jacks

does not open directional circuit when seat is raised, or

and block in position. Remove drip pan from bottom of

when switch is replaced, adjust as follows:

truck to gain access to lower part of linkage.

(1) Disconnect battery receptacle.

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

(2) Remove pin from upper linkage yoke (fig. 4-

and remove the brake linkage. Caution: Carefully remove

14). This will allow seat to pivot freely.

retainer from lower end of rod. Spring is under tension.

(3) Operate seat and check operation of switch

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

actuator (fig. 4-14) and switch. Switch should open just

and install the parking brake linkage.

before parking brake is applied.

d. Brake Adjustment. Drive truck to a 15

(4) Loosen switch mounting screws (fig. 4-14)

degree incline and remove weight from seat. Truck

and move switch horizontally on bracket. Move switch to

should remain stationary. If truck does not hold in

right to provide faster switch action and to left to allow

position or if brake drags when truck is operated, adjust

actuator to contact switch later. Tighten mounting screws

as follows:

and connect upper yoke to actuator.

(1) Disconnect battery receptacle and block a

(5) Check adjustment as follows:

wheel to prevent truck from rolling. Remove floor and

(6) Connect battery receptacle and prepare

toe plates and drip pan.

truck to travel (para 2-9).

(2) Raise operator's seat all the way. Remove

(7) With operator in seat and key switch on,

cotter pin and yoke pin (fig. 4-14) from upper end of

start to place truck in motion (para 2-11).

linkage.

(8) Remove weight from seat to apply parking

(3) Loosen lock nut (fig. 4-14) and adjust

brake. Indicator light (fig. 2-2) should go out.

4-16