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Figure 4-13. Accelerator control box, installed view.
TM-10-3930-631-12 Truck Lift Fork EMD Solid Rubber Tired Wheels 4 000 Lbs Capacity 144 and 180 In Lift Army Model MHE 227 Manual
Figure 4-14. Parking brake upper linkage and caliper assembly, installed view.
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
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
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

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