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WARNING: There must be maximum
pressure in the air pressure system,
about 7-8 bar (the pressure gauge (20)
of the system is located beside the
instrument panel), before driving a tractor which
has a trailer with air brakes.
3. Changing and bleeding the brake fluid
When changing the tractor brake fluid, to empty the
pipes, open the bleed nipples of the control valve ,
both brake pedal circuits have their own bleed
nipples. The control valve (21) is situated on the
right side under the cab on the rear side 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 air brake valves (21) as
bleeding the brake cylinders.
4. Service
4.1. Common points
The pressure container can not be welded and
drilled.
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.
4.2. Service daily
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.
4.3. Service weekly or after every 50
operating hours
Check the fixing bolts of the compressor. Check
and adjust the compressor belt tension by adjusting
the adjusting wheel (1).
4.4. Service after every 500 operating hours
Grease the rubber surfaces of the trailer quick
couplings (9-11) with grease.
Grease the joint of the lever for the parking brake
cylinder (15A).
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.
1. The construction of the trailer brake valve:
1 Brake pedals
2 Brake fluid reservoir, common with the tractor
brakes
3 Main brake cylinders
4 Release valve, (compensation valve) through the
release valve the control pressure goes to the
brake valve (6) only when the both pedals are
pressed
4A Bleed nipples of the release valve
5 Control pressure for the brake valve
6 Brake valve
6A Bleed nipple of the brake valve
7 Quick---action coupling for the trailer brake
8 Hydraulic pump
9 Brake cylinders for the trailer
10 Auxiliary hydraulic valves + power lift
The trailer brake valve system makes use of the
pressure of the tractors hydraulic system controlled
with the brake valve.
2. Instructions for operating
The trailer brakes are connected to the quick-action
coupling at the rear part of the tractor (7).
WARNING: When sing the trailer
brakes the brake pedals must always
be locked together when driving on
the road.
WARNING:The trailer brakes do not
operate, if only one of the
brake pedals is pressed. When the
locking of the
brake pedals is disconnected, the
tractor brakes can be used as steering brake.
WARNING: The trailer brakes do not
work when using the parking brake.
WARNING: When the engine is not
running, the trailer brakes do not work.
3. Changing and bleeding of the brake fluid
When changing the tractor brake fluid, to empty the
pipes, open the bleed nipples of the trailer brake
release valve (both brake pedal circuits have their
own bleed nipple ), and the bleed nipple of the
brake valve . The release valve and brake valve
are situated on the right hand side under the cab.
The release – and brake valves are situated lower
down than the brake cylinder of the tractor.
Therefore they have to be bleed before bleeding
the brake cylinder. First bleed the valves of the
release valve, at the same way as when bleeding
the brake cylinders. Then bleed the valve of the
brake valve, the pedals must be locked together.
- Function with the pressure of the tractor
hydraulics, controlled by the braking valve
- The control pressure of the brake valve will be led
from the brake pedal circles through the release
valve.
- Trailer brake connection to the tractor with quick-
action coupling
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