Servicing And Adjustment Of The Hydraulic Brake System - LAUMETRIS PTL Series User Manual

Picture 22. The elements of the braking system. 1 – brake chamber; 2 – tie-rod; 3 – lever; 4 – adjustment bolt;
5 – lubrication point; 6 – cam shaft; 7 – hand-brake cable
When changing the position of the handles of the braking force regulator, under the full load of the
semi-trailer, it is necessary to ensure complete air supply to the pneumatic brake chambers.
After adjusting the working brake of the tractor semi-trailer, it is necessary to adjust the hand-brake.
For this purpose, the length of the cable 7 (Picture. 22) connecting the brake lever with the tension mechanism
is changed.
ATTENTION!
Constantly check the operation of the braking mechanism. When necessary, adjust or repair it.
The brake blocks must be checked once a year and be replaced worn-out brake blocks with new ones. After
the motion parts work in, re-adjust them.

7.2.3. Servicing and adjustment of the hydraulic brake system

During the use of the tractor semi-trailer, it is necessary to check the tightness of the hydraulic brake
system and condition of its elements, to periodically lubricate the marked points.
The adjustment of the brakes shall be performed when:

the brake blocks are worn-out. The space between the brake blocks and drum increases, causing
the impairment of braking efficiency;

the wheels are braked not simultaneously and not uniformly.
The adjustment of the brakes shall be performed only after the adjustment of the bearings of the wheel
hub, by changing the brake shaft's brake lever torque or angle of brake lever in respect of the shaft. For this
purpose, it is necessary:

place protection wedges (blocks) under the wheel opposite to the one being adjusted;

insert a jack under the axle, at the marked place, and lift the wheel;

while rotating the wheel, also turn the adjustment bolt 3 (Picture. 23) until the braking blocks
touch the drum
USER MANUAL Tractor semitrailers PTL 49