Maintenance & Adjustment
178
D760.H03E-001.H1907
Automatic Adjuster
Please refer to the specific configurations
of your vehicle.
If the brake is equipped with an automatic
adjuster, the clearance between the brake shoe
and brake drum can be adjusted smaller auto-
matically when the friction lining is worn and the
clearance exceeds the set value, so as to
reduce the maintenance time and ensure driving
safety.
During normal operation, add lubricating
grease from the grease nipple every 20,000km.
Check the reverse adjusting torque every
20,000km, namely by rotating the worm shaft
counterclockwise (repeat three times); if the
torque is less than 18N·m, make sure to replace
the adjuster, and check if the parts and assem-
blies of the brake return smoothly without sei-
zure during operation.
Check the brake friction lining for wear regularly, so as to avoid degradation of
the braking performance and damage to other parts due to excessive wear of friction
lining.
To replace the brake shoe, rotate the worm shaft to keep the camshaft at the min-
imum opening position. After the friction lining is replaced, depress the brake pedal
about 30-40 times with the complete vehicle air pressure no less than 300kPa to
reduce the brake clearance. When the vehicle is in service, the shoe friction lining
clearance will be adjusted automatically and continuously along with the
prºCeeding of running-in, till it is kept within the designed reserved clearance range.
Method for manual adjustment of brake clearance
For new vehicles or vehicles whose friction lining has been replaced, if the nor-
mal operation is affected as the clearance between brake shoe and drum is incorrect
or the clearance becomes smaller due to thermal expansion of new friction lining or
running in hilly region (frequent braking), the brake clearance can be adjusted larger
manually.
1. Fit the double offset ring spanner over the worm shaft head, rotate the worm shaft
to make the friction lining contact the brake drum, and then rotate the worm shaft
in reverse direction by 1/2-2/3 turn (a click will be heard during rotation in reverse
1. Shaft pin
2. Worm shaft
3. Grease nipple
4. Connecting yoke
5. locking nut
6. Control arm
7. Fastening bolt
Summary of Contents for DFH4180 Series
Page 2: ......
