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Design and operation
trailer and the tractor, the control valve will
automatically activate the trailer's brakes.
Valve used in the system is equipped
with a circuit causing the brakes to be ap-
plied when trailer is disconnected from
the tractor. When compressed air conduit
is connected to the tractor, the device
automatically applying the brakes now
changes its position to allow normal brake
operation.
Pneumatic brake cylinders used in the
systems are mounted on specially de-
signed brackets welded to the wheel axles.
In the pneumatic cylinders, air supplied
to cylinder exerts pressure on membrane
which in turn moves cylinder piston and
rotates to axle expander lever. Return of
cylinder to neutral position is assisted by
draw back springs.
Relay valves (4) are designed to increase
the speed of air transmission to cylinders
during braking. Automatic braking force
regulator (3) adapts braking pressure de-
pending on the trailer load. During normal
work it does not require service.
2
1
Figure 3.4
Pneumatic connection
(1) connection body
(2) connection cover
PNEUMATIC CONNECTIONS
Pneumatic connections are equipped with
covers (2), that protect the connections
against contamination and entrance of
dirt into the system. They are made from
coloured plastic (red connection – supply
air; yellow connection - control air). The
connections are made according to rec-
ommendations of DIN ISO 1728 standard.
Thanks to this, the connections cannot
be incorrectly connected to the agricul-
tural tractor's sockets. After unhitching the
trailer, place the pneumatic connections in
the specifically prepared sockets, located
on the drawbar.
PRONAR RC3100
Section 3
621-G.04-1
G.3.1.621.03.1.EN
3.7
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