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some marketing areas).
NOTE: When using the trailer brakes the brake pedals
must always be locked together when driving on the
road. When pressing one brake pedal, the brake action
of the trailer is smaller.
The trailer brakes operate also when using the parking
brake.
From the air pressure system it is possible to get pressure
for external purpose (8 bar), e.g. for tyre/tire filling, from
coupling (3A) which is situated on the left side under the
cab. Through this coupling the system can be filled, when
needed, by outside compressed air e.g. when the
compressor of the tractor is broken. By doing this the
coupling can not be turned to bottom.
When the couplings (9---11) of the trailer are not in use,
keep the covers on them.
When the ambient temperature is colder than +5 C, the
antifreeze container (2) must be filled with ethyl alcohol or
methanol. The liquid streaming valve lever (2A) has to be
in the open (position 1).
The container and streaming valve lever are situated
under the left front corner of the cab.
DANGER: There must be maximum pressure in the air
pressure system, about 7---8 bar (the pressure gauge
(4) of the system is located beside the instrument
panel), before driving a tractor which has a trailer with
air brakes.
Changing and bleeding the brake fluid
3.
When changing the tractor brake fluid, to empty the pipes,
open the bleed nipples (7A) of the control valve (7), both
brake pedal circuits have their own bleed nipples. The
control valve (7) is situated on the left side under the cab
on the rearside of the pressure tank.
The control valve is situated lower than the tractor brake
cylinders. Therefore it has to be bled before bleeding the
brake cylinder. Bleeding is done in the same way from the
bleeding valves (7A) as bleeding the brake cylinders, see
page 90.
Service
4.
Common points
4.1.
The pressure container can not be welded and drilled.
The system includes a filter, which is situated in the
pressure regulator. It has to be cleaned/changed
occasionally (depending on use). The filter can be
removed by first loosening the tyre/tire filler coupling (3A).
The pressure regulator is provided with an inbuilt pressure
regulator, which operates, if the pressure rises to 12---14
bar. This can be caused by a broken pressure regulator
valve, frozen or blocked filter.
Service daily
4.2.
The water has to be drained daily from the press air
system by pressing and pulling the spindle (6) of the
water draining valve at the bottom of the container.
Service weekly or after every 50 operating hours
4.3.
Check the fixing bolts of the compressor. Check and
adjust the compressor belt tension by adjusting the
adjusting wheel (1).
Service after every 250 operating hours
4.4.
Grease the rubber surfaces of the trailer quick couplings
(9---11) with Valtra Calsium LF--- Grease.
Check the integrity of the system. The system has to be
air tight, so that after stopping the engine the pressure
does not decrease more than 0.15 bar during 10
minutes (2%). When needed repair the leaks.
---121---
K. Extra equipment
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