Two-line pneumatic drive (MTZ-
900.3/920.3/950.3/952.3)
*
The tractors may be equipped with two-
line pneumatic brake actuator for the
trailers equipped with pneumatic brake
actuator.
Pneumatic drive is also used for inflating
the tyres and other purposes, when the
compressed air power is required.
1 – compressor; 2 – pressure regulator; 3 – air intake valve; 4 – tank; 5 – pressure indi-
cator; 6 – emergency pressure pilot lamp; 7 – pressure transducer; 8 – emergency
pressure drop sensor; 9 – condensate removal valve; 10 – supply line; 11, 11a – con-
necting heads; 12 – control line; 13 – brake valve.
Air is taken into the system from the en-
gine intake manifold. Air is compressed
in compressor (1) and supplied to tank
(4) via pressure regulator (2) maintain-
ing the required pressure in the tank.
Compressed air is supplied from the
tank via pipeline to the brake valve (12).
From the brake valve air is passed via
supply line (10) with the connecting
head (11) (with red cover), which is con-
stantly under pressure.
The brake valve with connecting head
(11a) (yellow cover), where there is no
pressure. Controlling the brakes of the
trailers and agricultural machines is ex-
ercised in two modes: direct and auto-
matic.
The direct control is exercised by the
pressure build-up in the control line (12) to
6.5-8.0 kgf/cm
2
when braking the tractor.
In this case, the supply line (10) remains
pressurized and compressed air feeding to
the trailer pneumatic system goes on.
Automatic brake control is exercised at the
cost of pressure drop to zero in the trailer
supply line during in case of its disconnec-
tion (detachment) from the tractor. Here
the valve in the connecting head (red cov-
er) is automatically shut down preventing
compressed air outflow from the tractor
system.
________________________________
* For other models – optional.
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