2122.6-0000010 OM
151
Air shall be taken to the pneumatic drive from the inlet manifold of the engine. Air is
compressed in compressor 17 and delivered to tank 3 through pressure regulator 15,
maintaining required pressure in the tank. From the tank compressed air goes to brake
valves 1 and 14 and to supply line 13 with coupling head 10 (with red cover) which is con-
stantly under pressure. Brake valve 14 is connected to coupling head 11 (with yellow
cover) by means of control line 12. There is no pressure in it. There are two modes to op-
erate brakes of trailers and agricultural implements: direct and automatic.
When attaching a trailer with a single-line pneumatic drive the trailer head is to be
connected to coupling head 9 and air comes to the trailer pneumatic drive. As you press
brake pedals or engage the parking brake compressed air comes from connecting line 8 to
the atmosphere through brake valve 1.
The air distributor gets activated on the trailer supplying compressed air from the
trailer tank to brake chambers, and the trailer brakes. In case of trailer emergency de-
tachment the coupling heads get disconnected, air from the trailer line comes into the at-
mosphere and the trailer brakes automatically.
Direct operation of the brakes is carried out at the cost of pressure drop in connect-
ing line 8 to 0 MPa as tractor brakes. Hereby delivery of compressed air into the system
stops.
Automatic operation of the brakes (automatic braking) is carried out in case of cou-
pling break and trailer detachment at the cost of pressure drop in the trailer connecting
line.
When a trailer with a double-line pneumatic drive is used the trailer coupling heads
shall be connected to coupling heads 10 (with red cover) and 11 (with yellow color), i.e. to
supply line 13 and to supply line 12. Herewith, compressed air is constantly delivered to
the trailer through supply line 13. As you press brake pedals or engage the parking brake
compressed air is delivered to the trailer through brake valve 14 and control line 12. The
air distributor gets activated on the trailer supplying compressed air from the trailer tank to
brake chambers, and the trailer brakes.
Direct operation of the brakes shall be carried out at the cost of pressure escalation
in control line 12 to the value from 0.65 to 0.8 MPa as tractor brakes. Hereby supply line
13 stays under pressure and compressed air delivery to the pneumatic system remains
unchanged.
Automatic operation of the brakes (automatic braking) is carried out in case of cou-
pling break and trailer detachment at the cost of pressure drop in the trailer supply line.
Air pressure in tank 3 shall be controlled by air pressure gauge 7 and pilot lamp of
emergency air pressure 6 of red color (installed on the dashboard), air pressure sensor 5
and emergency air pressure sensor 4.
To remove condensate from tank 3 there is condensate removing valve 2. Conden-
sate shall be removed by setting the pusher with the ring aside and up.
Air is bled form the pneumatic drive (for tyre inflation) through air bleed valve 16 of
pressure regulator 15.
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