Valve Group - Belarus 1822.3 Operator's Manual

3.15.4 Valve group

The HLL valve group in its basic configuration is an integrated unit of "BOSCH" com-
pany. The integrated unit "BOSCH" consists of a spool hydraulic valve 3 (figure 3.15.5) and a
regulator 2 with lift linkage electromagnetic control.
The hydraulic valve 3 is three-section, four-position, open-centre, of "BOSCH" company.
The second and third section spools can be fixed in positions "neutral" and "floating". The first
section spool can be fixed in positions "uplift", "neutral" and "floating", it is equipped with a device
of automatic return from the position "uplift" to the position "neutral" as the preset value is
achieved.
The discharge openings of the valve sections are used for rear outlets of the hy-
draulic system, in case the front lift linkage is mounted the hydraulic cylinders are powered
from a middle section of the valve with use of high-pressure hoses.
The valve spools are operated by two-directional cables 5, providing control of the
valve spools 4 by means of control levers 7, which are located on a panel to the right of
the operator's seat. The cable braiding is fixed by means of nuts in a bracket 6 from one
side, and in adapters 4 of the valve.
Shifting the lever from "neutral" position forward along tractor movement sets the
spools into positions "lower" and "floating"; backward – into position "uplift".
1 – high-pressure hoses; 2 – regulator
(adapters); 5 – operating cables; 6 – bracket; 7 – control levers; 8 – hydraulic cylinder
90 250; «I» – first spool lever; «II» – second spool lever; «III» – third spool lever.
Figure 3.15.5 – HLL valve control
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R-23 LS; 3 – hydraulic valve; 4 – spools
2022.3-0000010 OM