Hydrostatic Steering Control; General Information - Belarus 1822.3 Operator's Manual

3.14 Hydrostatic steering control

3.14.1 General information

The hydrostatic steering control (HSC) is intended for turning guide wheels, for
steering effort decrease as the tractor turns.
The HSC hydraulic circuit diagram for BELARUS-1822.3/2022.3 tractors is shown in
figure 3.14.1.
The HSC of BELARUS-1822.3/2022.3 consists of a dosing pump 2 (figure 3.14.1),
two differential hydraulic cylinders 1, making a turn, a feed pump 3 driven by the engine,
an oil tank 5 and hydraulic fittings.
The oil tank 5 with a 25 micron coarse filter 4 serve as an oil reservoir. The valve 6
is installed in the system, it ensures operation of the HSC emergency oil pressure sensor.
The dosing pump 2 is mounted on the steering column, the hydraulic cylinders of
the turn 1 are mounted on the front driving axle of the tractor, the feed pump 3 is mounted
on the engine. The dosing pump 2 is linked with cavities of the hydraulic cylinders of the
turn, with the feed pump and the oil tank 5 by means of oil pipelines. At linear movement
the cavities of the cylinder 1 are locked by spool lands of the dosing pump 2, and oil from
feed pump 5, arriving to the dosing pump 2, comes back into the oil tank 5. As you rotate
the steering wheel, the spool of the dosing pump 2 displaces, ensuring oil supply into one
of the cavities of the hydraulic cylinder of the turn 1 in the volume that corresponds to the
turning angle of steering wheel. Oil from the other cavity of the hydraulic cylinder 1 comes
back through the dosing pump 2 into the oil tank 5.
The HSC hydraulic circuit diagram for BELARUS-1822 .3/2022 .3 tractors is shown in
figure 3.14.2.
The HSC of BELARUS-1822 .3/2022 .3 consists of two dosing pumps 2 and 3 (fig-
ure 3.14.2), a reverse tap 4, two differential hydraulic cylinders 1, making a turn, a feed
pump 5 driven by the engine, hydraulic fittings.
The reverse tap is installed to ensure HSC operation at forward travel and at re-
verse. The reverse tap is installed under the bonnet. The reverse tap 4 is controlled by
moving the handle into any of two positions until it is secured in each of them.
The oil tank 7 with a 25 micron coarse filter 6 serve as an oil reservoir. The valve 7
is installed in the system, it ensures operation of the HSC emergency oil pressure sensor.
The dosing pumps 2 and 3 are mounted on the steering columns, the hydraulic cyl-
inders of the turn 1 are mounted on the front driving axle of the tractor, the feed pump 5 is
mounted on the engine. The dosing pumps 2 and 3 are linked with cavities of the hydraulic
cylinders of the turn, with the feed pump and the oil tank by means of oil pipelines. At lin-
ear movement the cavities of the cylinder 1 are locked by spool lands of the dosing pump
2 or 3, and oil from feed pump 5, arriving to the dosing pump 2 or 3, comes back into the
oil tank. As you rotate the steering wheel, the spool of the dosing pump 2 or 3 displaces,
ensuring oil supply into one of the cavities of the hydraulic cylinder of the turn 1 in the vol-
ume that corresponds to the turning angle of steering wheel. Oil from the other cavity of
the hydraulic cylinder 1 comes back through the dosing pump 2 or 3 into the oil tank.
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