4-8
GROUP 3 TESTS AND ADJUSTMENTS
1. ADJUSTMENT OF WHEEL BRAKE
Adjust with engine stopped.
Jack up truck. Extend adjustment screw by
clicking adjustment wheel teeth with a
screwdriver until wheel(mounted on brake
drum being adjusted) offers a light
resistance when turned by hand. Back
adjustment wheel by 25~30 teeth to shorten
length of adjustment screw.
When backing adjustment wheel, be sure
to adequately raise adjustment lever to
keep it free from interference with
adjustment wheel. If lever is bent by
mistake, it loses proper function.
1)
ö
Adjustment screw
Brake shoe
extracting direction
Adjustment wheel
Lever
Lever
Adjuster assy
D353BS04
After adjusting brake, drive machine for
about 500m, then check heat of brake drum
at 4 points to confirm that brakes are not
dragging.
After adjusting, confirm that brake stopping
distance is within standard range.
2)
3)
2. AIR BLEEDING OF BRAKE SYSTEM
Air bleeding should be performed by two
persons :
One rides on truck for depressing and
releasing brake pedal : the other person is
on the ground and removes cap from air
vent plug on wheel cylinder.
Block the front wheel securely and apply
parking brake.
Start the machine.
Attach a vinyl tube to air vent plug and
immerse other end of tube into a vessel
filled with hydraulic oil.
Loosen air vent plug by turning it 3/4 with a
wrench. Depress brake pedal to drain oil
mixed with air bubbles from plug hole.
Depress brake pedal until no air bubbles
come out of air vent plug hole.
After completion of air bleeding, securely
tighten air vent plug. Install cap on plug.
1)
2)
3)
4)
5)
6)
7)
Brake drum
Lining
Brake oil
Air vent
plug
B207BS07
