HELI G Series Operation & Service Manual page 25

The pull rod is mounted to the primary shoe side by pin. The move of the pull rod is
transmitted to the secondary shoe side through push rod. (See Fig. 2-5)
(3) Clearance self-adjusting mechanism
A proper clearance between the friction piece and the brake drum is maintained by
the clearance self-adjusting mechanism. (See Fig. 2-6)
The clearance self-adjusting mechanism actuates only when the truck in reverse
travel.
▲Operation of the clearance self-adjuster
When brake during travelling backward, the secondary brake shoe contact with main
Fig. 2-5 Parking brake
Fig. 2-6 Clearance self-adjuster
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