Belarus 2022.6 Operator's Manual page 129

The hydraulic drive of trailer brakes is subsequently fed from the pump of the tractor
hydraulic lift linkage with the help of high-pressure hoses 4 and 5 (figure 4.7.3). As brake
valve 3 comes into action, oil is supplied to the trailer (semi-trailer) brake system along line
9 through coupling 1. Brake valve 3 comes into action when brake liquid is supplied from
the operating brakes control system to brake valve 3 along lines 8 to distribution valve 7.
Brake liquid is supplied to brake valve 3 when both operating brake pedals are pressed at
the same time. If only one brake pedal is pressed, distribution valve 7 does not come into
action and accordingly, brake liquid is not supplied to brake valve 3.
Coupling 1 prevents oil outlet when the hydraulic drive is used without the trailer.
When brake line of the trailer is connected with brake line of the tractor, the coupling pro-
vides oil inlet to the trailer.
ATTENTION: TRACTOR EQUIPPED WITH THE HYDRAULIC DRIVE OF TRAILER
BRAKES CAN NOT BE COUPLED WITH TRAILERS HAVING THE PNEUMATIC DRIVE
OF THE BRAKES!
ATTENTION: CONNECT AND DISCONNECT THE BRAKE HYDRAULIC LINE OF
THE TRACTOR AND TRAILER ONLY WHEN THE ENGINE IS STOPPED AND THE
PARKING BRAKE IS ENGAGED!
1 – coupling; 2, 6 – hole fitting for bleeding; 3 – brake valve; 4 – oil feed line from the brake
valve to the HLL distribution valve; 5 – oil feed line from the HLL pump to the brake valve;
7 – distribution valve; 8 – brake liquid feed line; 9 – oil feed line from the brake valve to the
connecting coupling.
ATTENTION: WHILE THE HYDROSTATIC CONTROL BLEEDING BY MEANS OF
OPERATING BRAKES WHEN THE HYDRAULIC DRIVE OF TRAILER BRAKES IS
MOUNTED, IT IS ADDITIONALLY REQUIRED TO LET OUT AIR FROM BRAKE VALVE 3
AND DISTRIBUTION VALVE 7 (FIGURE 4.7.3) THROUGH HOLE FITTING FOR BLEED-
ING 2 AND 6 RESPECTIVELY!
Figure 4.7.3 – Hydraulic drive of trailer brakes
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2022.6-0000010 OM