Maintenance & Adjustment
D760.H03E-001.H1907
179
direction); the brake drum should rotate freely without contacting any part at this
moment.
2. In case the worm shaft cannot rotate because the automatic adjuster has been in
service for a long time or has not been maintained, lubricated in time, remove the
fastening bolt of the control arm and follow step 1 to put it into service. In this case,
the adjuster loses automatic adjusting function, and you should go to the service
station to have the automatic adjuster repaired or replaced in time.
CAUTION:
1.Never adjust the brake clearance by hand except for the above-
mentioned condition;
2.Check the wear condition of friction lining regularly to prevent braking
failure due to overworn friction lining.
3.During manual adjustment of brake clearance, never change the push
rod stroke by tightening the connecting yoke of brake chamber push
rod;
4.To adjust the rear brake, always park the vehicle on a flat place and
ensure the air reservoir pressure is above 700kPa.
5.Adjust the rear brake clearance only after the wheels are chocked at the
front and back, and the parking brake is released.
6.In case the automatic adjuster is abnormal, make sure to stop the
vehicle immediately to check the automatic adjuster and other
components of the brake system, and take necessary measures to
eliminate the fault.
7.Before tightening the fastening bolt of control arm, rotate the control
arm around camshaft in the direction of arrow marked on the
automatic adjuster housing.
Automatic adjuster with control arm
Maintenance of automatic adjuster
1. Add lithium base grease (DFCV-C20-L)to adjuster every 20,000 km.
2. Rotate the worm hexagonal head anticlockwise every 20,000 km, then measure if
the rotating torque is higher than 18 Nm, and repeat measurement for three times.
If the torque measured is less than 18 Nm, replace the adjuster assembly
immediately.
Common faults & countermeasures
Improper adjustment of brake clearance (like brake drag during driving) is usually
caused by the fault of brake system rather than automatic adjuster as the automatic
adjuster can only adjust brake clearance smaller. This problem is likely to ºCcur under
the following conditions, and please take corresponding measures; otherwise driving
safety might be affected due to large clearance:
1. Running-in of new vehicle
Summary of Contents for DFH4180 Series
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