Page 789 - Workshop Manual - Aumark (BJ1051)

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Rear axle- rear wheel brake

Front wheel brake

Adjustment

1. Partial adjustment
(a). Clean the dirt and oil stains on the worm shaft head of the adjusting arm, set the wrench on the
hexagonal head and press down the lock sleeve to keep the worm shaft in non-locking state. (If
the lock sleeve can not be pressed down, a hammer can be used to knock on the wrench
gently.)
(b). Rotate the worm shaft to make the clearance between the brake shoe and the brake drum
disappear, reverse the worm shaft for 1/2 ~ 2/3 revolution (normally 3-5 sounds) to make the
clearance between the brake shoe and the brake drum reach the required clearance. Do not
loosen the lock nut of the brake shoe pin or change the installation position of the camshaft to
avoid breaking the correct cooperation relationship between the brake shoe and the brake
drum.
(c). Rotate the brake drum after adjusting the brake clearance, if there is slight grating, enlarge the
clearance slightly. The deviation occurs during the driving is the inconformity of the left and
right brake clearance, which can be excluded by adjusting the clearance between the brake
shoe and the brake drum.

2. Complete adjustment
(a). prop the vehicle up and make the wheels leave the ground.
(b). Loosen the push rod clevis cotter pin of the brake chamber and remove the pin axle.
(c). Rotate the worm shaft to make the two brake shoes attach to the brake drum and the wheels
can’t move.
(d). Reverse the worm shaft for 1/2~2/3 revolution (normally 3-5 sounds) to make the brake drum
rotate freely without friction with brake shoe lining or other parts.
(e). Check the brake clearance and the clearance between the brake shoe lining and the brake drum.
(f). Adjust the brake chamber push rod stroke: Connect the brake chamber push rod clevis pin axle
and lock up the cotter pin. Loosen the push rod clevis lock nut and adjust the push rod stroke ,
the ideal brake chamber push rod stroke. 26
Brake chamber push rod stroke.
Vehicle type Brake chamber effective stroke Maximum adjustment stroke of brake chamber
1051 series 44.5 mm 35 mm
1061 series 57.1 mm 45 mm
1089 series 63.5 mm 51 mm

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