Belarus 1523, Руководство по эксплуатации

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BELARUS-1523/1523 В /1523.3 /1523В.3 Construction and Operation
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Air is taken up into the pneumatic
actuator from the engine inlet manifold.
The compressor (8) compresses the air
and feeds it to the air bottle (3) through
the pressure regulator (4) maintaining
the required pressure level in the air bot-
tle. From the air bottle compressed air
is fed to the brake valve (10) and fur-
ther into the supply manifold (11) with
the coupling head (12) (with a red cap),
which is permanently under pressure.
The brake valve (10) is connected with a
coupling head (1) (with a yellow cap) by
means of the control manifold (2). There
is no pressure in this manifold.
The brakes of trailers and agricul-
tural machines are controlled in two
modes: direct and automatic one.
When using the trailer with a two-
line pneumatic actuator, the coupling
heads of the trailer are connected to the
coupling heads (12) (with a red cap) and
(1) (with a yellow cap), i.e. to the supply
manifold (11) and to the control manifold
(2). Here compressed air is fed perma-
nently to the trailer through a supplying
manifold (11). On stepping on the brake
pedals or applying the parking brake,
the compressed air is fed to the trailer
through the brake valve (10) and control
manifold (2). The trailer air distributor
operates to feed the compressed air
from the bottle into the brake chambers
and the trailer gets braked.
The direct control of the brakes is
achieved by raising pressure in the control
manifold (2) up to 0.65…0.8 MPa when
braking the tractor. As this takes place,
the supply manifold (11) remains pres-
surized with the compressed air supply
into the pneumatic system of the trailer
maintained.
The automatic control of the brakes
(automatic braking) is achieved in case of
breakage of the coupling and detachment
of the pressure due to the pressure drop
in the trailer supply manifold.
The pneumatic actuator is pro-
vided with the valve-type coupling heads
(1, 12). The valves of the coupling heads
keep the compressed air from leakage
when using the pneumatic actuator
without trailer (for example, when inflat-
ing the tyres) and in case of emergency
detachment of the trailer. When the
brake manifolds of the trailer are con-
nected with the manifolds of the tractor,
the coupling heads get open that allows
the compressed air to pass from the
pneumatic actuator of the tractor to the
trailer. It is recommended to connect the
pneumatic manifolds with no pressure in
the air bottle (3) of the tractor.
The air pressure in the bottle (3)
is monitored by the air pressure gauge
and red warning lamp of emergency air
pressure (installed in the dashboard), air
pressure sensors (7) and emergency air
pressure sensors (6).
The condensate draining tap (9)
is provided for removing the condensate
from the bottle (3). To drain the conden-
sate, deflect the pusher aside and up-
wards by means of a ring.
The air is taken up from the
pneumatic actuator (for inflating tyres,
etc.) through the air intake valve (5) of
the pressure regulator (4).