2122.6-0000010 OM
64
Joystick 4 (figure 2.19.4) controls sections No.1 and No.2, joystick 3 – sections No.3
and No.4. Joysticks 4, 3 control for setting the corresponding sections of the hydraulic dis-
tributive valve into the neutral position, “uplift” and “lowering” is analogical to joysticks BED-
01 control and described in clause 2.19.2.2.
“Floating” mode on section No.1 is switched on by shifting joystick 4 forward against
stop with further pressing of button 1, located on joystick 4 handle. Switching on of “floating”
mode on section No.2 is carried out by shifting joystick 4 handle to the right against stop
with further pressing of button 1. The set “floating” mode is memorized by the joystick and
remains unchanged after shifting the joystick handle into the neutral position. To go out of
“floating” mode, it is required to carry out any manipulation by this joystick handle on this
section after shifting the joystick handle into the neutral position. Setting of hydraulic dis-
tributive valve sections No.3 and No.4 into “floating” mode and exit from “floating” mode is
carried out by joystick 3 and button 2 analogically to the above said.
In case tractors “BELARUS-2122.6” are equipped with joysticks “BOROCO”, setting
of the fixed flow mode on the hydraulic distributive valve sections is only possible by means
of OPU for HLL.
For the reason of unavailability of annunciator panel for BED operation modes on
the electronic joystick unit “BOROCO”, operation control for EHS hydraulic distributive
valve sections is only possible by means of operations programmer unit for the hydraulic
lift linkage system. By doing so, OPU for HLL shall be switched on.
Control circuit for the hydraulic distributive valve sections with joysticks “BOCORO”
is specified on instruction plate 5 and shown in figure 2.19.5.
Figure 2.19.5 – Control circuit for the hydraulic distributive valve sections with joysticks
2.19.3 Operations programmer unit for hydraulic lift linkage system
2.19.3.1 General information
OPU for HLL reflects EHS hydraulic distributive valve operation and controls EHS
hydraulic distributive valve sections in accordance with the set operation modes and con-
trol algorithms.
ATTENTION: ENGAGEMENT OF OPU FOR HLL IS ONLY POSSIBLE WITH THE
ENGINE RUNNING!
OPU for HLL has two operation modes:
- operation indication for EHS hydraulic distributive valve sections when controlling
the hydraulic distributive valve directly from two joysticks (manual mode);
- control for EHS hydraulic distributive valve sections during hydraulic distributive
valve operation on the set algorithm (automatic mode).
In case of absence of electric signals on any of the channels from joysticks onto the
engaged OPU for HLL, annunciators “uplift” and “lowering” for the corresponding section of
EHS hydraulic distributive valve (figure 2.19.6) blink in turn.
The panel of OPU for HLL is shown in figure 2.19.6.
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