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Section 5: USING THE TRACTOR
5-20
PNEUMATIC TRAILER BRAKING SYSTEM
The combined trailer pneumatic braking system (double and single conduit) is composed of engine
driven compressor, air tank, control valves and three pneumatic connectors. Connectors are mounted at rear
of tractor and may be connected to single conduit or double conduit trailer braking system. Pneumatic
connectors are in three colours: black, red and yellow. Black connector is used for single conduit system,
and red (supply) and yellow (control) for double conduit system.
ATTENTION: Various types of trailer braking systems are available. Before connecting
to tractor's pneumatic braking system, read trailer manufacturer's Operator's Manual.
A
B
C
Figure 5-24 Pneumatic system connector.
A- yellow connector (double conduit system)
B- red connector (double conduit system)
C- black connector (single conduit system)
ATTENTION: Trailer brakes only act when they are pressed by both brake pedals in tractor. Therefore
brakes should always be locked together with catch, if a trailer is hitched to tractor.
Tractor handbrake is connected to the main control valve. After connecting handbrake, trailer brakes
are activated.
Single conduit trailer system
If the trailer is equipped with single conduit system then connect pneumatic conduit to black
connector C
(
Figure 5-24) of tractor's pneumatic system. After releasing tractor's brake pedals and parking
handbrake, 0.62 MPa pressure is maintained in the connection. Activating tractor brakes causes drop in
pressure proportional to pressure applied to brake pedals and activation of trailer brakes.
Double conduit trailer system
In trailer with double conduit braking system, connect pneumatic system supply conduit to red
connector B (Figure 5-24), and control conduit to yellow connector A (Figure 5-24).
ATTENTION: Double conduit system only works after connecting both conduits to red
and yellow connectors.
Supply conduit (red) – is the conduit that fills the tank of the trailer's pneumatic system. If for some reason
the trailer braking system is disconnected from the tractor, the pressure falls to 0 and trailer brakes are
applied.
Содержание PRONAR 5110
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