Forward rotation
Torque
Torqu e
(1) Operating cylinder ass'y
(2) Spring
(3) Cup
(4) Piston
(5) Boot
(6) Push rod for piston
(7) Return spring
(8) Friction piece
Fig.8-3 Wheel brake for 3-3.8 ton trucks
(9) Spring
(10) Parking push rod
(11) Spring pull wire
(12) Brake shoe
(13) Spring seat
(14) Spring pull rod
(15) Spring
(16) Spring
(17) Ratchet pawl
(18) Spring
(19) Clearance self-adjuster
(20) Pin
(21) Backing plate
(22) Return spring
(23) Parking pull rod
(24) Brake cable ass'y
The braking operation in the truck's forward travel is as follows: see Fig.8-4. The
primary and secondary shoes are respectively forced by a force equal in value and
contrary in direction each other, by operation of the operating cylinder to bring the
friction piece in contact with the brake drum. The primary shoe forces the adjuster
with the aid of friction force between the friction piece and the drum. Due to this, the
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