Main Brake - PRONAR T669 Operator's Manual

SECTION 3
In order to enable more precise unloading of loose materials there is a slide gate opening (2)
placed in the tailgate– figure (3.3). A chute for the trailer, secured under the lower edge of the
slide opening (3) may be supplied as additional equipment.
As an option, silo wall extensions 1 000 mm or 580 mm wall extensions with a front grid can
be installed on the trailer.

3.2.3 MAIN BRAKE

The trailer is equipped with one of four types of main brake:
• single conduit pneumatic system with three position regulator, figure (3.4),
• double conduit pneumatic brake system with three position regulator, figure (3.5),
• double conduit pneumatic brake system with automatic regulator, figure (3.6).
• hydraulic brake system, figure (3.7).
The pneumatic or hydraulic brakes are activated from the tractor driver's cab by pressing on
the brake pedal. The function of the control valve (2) - figures (3.4), (3.5) and (3.6), is the
operation of the trailer's brakes simultaneously when tractor's brakes are applied.
Furthermore, in case of an inadvertent disconnection of the conduit between the trailer and
the tractor, the control valve will automatically activate trailer's brakes. Valve used in the
system is equipped with a circuit causing the brakes to be applied when trailer is
disconnected from the tractor, compare with figure (3.8). When compressed air conduit is
connected to the tractor, the device automatically applying the brakes now changes its
position to allow normal brake operation.
3.7
Pronar T669