Belarus 1021, Руководство по эксплуатации, Страница: 69 / 209

BELARUS-1021/1021.3 Operating manual
68
Check and, if necessary, adjust the
pneumatic system brake valve two-cable
drive as follows.
1. Connect a pressure gage with a scale of
1 MPa min. to the coupling head with a
yellow cap of the control manifold.
2. Turn on the compressor, start the engine
and fill the cylinder with air to a pressure of
0.77 to 0.8 MPa as per the air pressure gage
located on the instrument panel of the tractor.
Air pressure as per the pressure gage
connected to the coupling head must be 0
MPa. If it is higher than specified, proceed as
follows:
- check availability of the clearance A
between the finger (5) (Figure 5.7.1) and the
upper edge of the grooves in the arms (6 and
7). The clearance must be 1 to 2 mm;
If there is no clearance, remove the cotter
pin and remove the finger (5) and adjust the
length of the arm by turning the end (4).
- check and adjust as necessary
precompression of the spring (3) to a size of
36…38 mm by rotating the nuts (2), then lock
the nuts. Adjust the spring precompression so
that when you press the service brake pedal or
engage the parking brake, first the brake valve
rod moves until it stops, and then the spring
compresses.
- if the brake valve drive is properly
adjusted and the brake valve is in good
condition, then when the blocked brake pedals
move to a full travel or the parking brake is
engaged up to its lock on the second-fourth
tooth, the pressure as per the pressure gage
connected to the coupling head must increase
to 0.65 to 0.8 MPa;
- disconnect the gage from the coupling
head.
If the mentioned adjustments do not
provide the above pressure parameters, then
unmount the brake valve and send it for
repair.