Two-Line Actuator Of The Trailer Brakes; Combined Actuator Of The Trailer Brakes - Belarus 921.6 Operator's Manual

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4.7.3 Two-line Actuator of the Trailer Brakes

The two-line pneumatic actuator provides for the trailers and agricultural machines

brakes control, which are equipped with the two-line pneumatic actuator of the brakes. The

pneumatic actuator is also used for the tyres inflation and other purposes, where the com-

pressed air energy is required. Diagram of the two-line pneumatic actuator is shown in

Figure 4.7.2.

The pneumatic actuator is equipped with the valve-type coupling heads 10, 11 (Fig-

ure 4.7.2). The coupling head valves prevent air escaping when the pneumatic actuator is

used without the trailer (for example during tyres inflation) and in case of emergency trailer

decoupling. When the trailer brake pipelines are connected to the tractor connecting pipe-

line, the coupling head valves are opening and provide for compressed air passage from

the tractor pneumatic actuator to the trailer. Meanwhile, the pneumatic pipelines shall be

connected when there is no pressure in the tractor cylinder 3.

ATTENTION:APPLY THE PARKING BRAKE PRIOR TO CONNECTING OR DIS-

CONNECTING THE PNEUMATIC PIPELINES OF THE TRACTOR AND TRAILER! THE

TRACTOR AND TRAILER PNEUMATIC PIPELINES SHALL BE CONNECTED WHEN

THERE IS NO PRESSURE IN THE TRACTOR PNEUMATIC SYSTEM!

1 – pressure regulator; 2 – air take-off valve; 3 – cylinder; 4 – condensate drain valve;

5 – air pressure indicator; 6 – emergency air pressure indicator light; 7 – air pressure sen-

sor; 8 – emergency air pressure sensor; 9 – feed pipeline; 10 - feed pipeline coupling head

(with red cover); 11 – control pipeline coupling head (with yellow cover); 12 – control pipe-

line; 13 – brake valve; 14 – compressor; 15 - pipeline from the diesel engine intake manifold.

Figure 4.7.2 – Diagram of the two-line pneumatic actuator of the trailer brakes.

The combined pneumatic actuator provides for the trailers and agricultural ma-

chines brakes control, which are equipped with the single-line or two-line pneumatic actua-

tor of the brakes. The pneumatic actuator is also used for the tyres inflation and other pur-

poses, where the compressed air energy is required. Diagram of the two-line pneumatic

actuator is shown in Figure 4.7.3.

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921.6-0000010 OM

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