Section 5: USING THE TRACTOR
5-21
Control conduit (yellow) – after connection of tractor brakes, increased air pressure is supplied through
yellow connector to trailer's control valve until there is full pressure in system. Degree of trailer braking is
proportional to pressure applied to tractor's brake pedals.
After starting engine, release handbrake and brake pedals. Pressure drop indicator light of
pneumatic system on the control panel next to the air pressure indicator (item 6; figure 4-12) will be
illuminated until pressure in pneumatic system rises to about 0.5 Mpa. After reaching required pressure of
0.55÷0.8 Mpa on air pressure indicator, loud sound of releasing excess air to atmosphere through valve will
be heard.
Press brake pedal several times to be sure that pressure shown on the gauge falls after engaging brakes
and rises after releasing them.
DANGER: Never drive the tractor when trailer brake light is illuminated.
ATTENTION: Before connecting conduits, clean trailer and tractor connectors. Ensure
that connections are secured. Check trailer brakes regularly to make sure they operate
correctly.
DANGER: Do not overuse brakes on steep slope. Use the same gear as when going
upwards, for descending slope of the same steepness.
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