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The joystick 4 (figure 2.16.4) controls sections No 1 and No 2, the joystick 3 controls
sections No 3 and No 4. Joysticks 4, 3 to set the corresponding sections of the hydraulic
distributor to positions "neutral", "uplift" and "lowering" are controlled by analogy with joy-
sticks EJU-01 as described in clause 2.16.2.2.
The "floating" mode over section No 1 is turned on by moving the joystick 4 forward
against the stop with the next pushing button 1, located on the handle of the joystick 4. The
floating mode over section No 2 is activated by moving the handle of the joystick 4 to the right
against the stop with the following pushing button 1. The set-up "floating" mode is remem-
bered by the joystick and remains after the joystick handle is moved into neutral position. To
exit the "floating" after the joystick handle was moved into neutral position mode it is neces-
sary to make any manipulation with this joystick handle over this section. The sections No 3
and No 4 of the hydraulic distributor are set into the "floating" mode and exited it with the joy-
stick 3 and the button 2 by analogy with the abovestated. Setting the sections No 3 and No 4
of the hydraulic distributor into the "floating" mode and exiting the "floating" mode is performed
with the joystick 3 and the button 2 by analogy with the abovestated.
If "BOCORO" joysticks are available on "BELARUS – 3522.5" tractor it is possible to
set the mode of fixed flow over a section of the hydraulic distributor only by means of pro-
gramming OPU of HLL.
Because there is no a board announcing EJU operation modes on the unit of elec-
tronic joysticks "BOCORO", it is possible to control operation of the hydraulic distributor
EHS sections by means of HLL operation programming mode. Hereby the OPU of the HLL
shall be on.
Diagram of the hydraulic distributor section control with the joysticks "BOCORO" is
shown in the instruction board 5 and presented in figure 2.16.5.
Figure 2.16.5 – Diagram of the hydraulic distributor section control with the joysticks
2.16.3 Operation programming unit (OPU) of the hydraulic lift linkage
2.16.3.1 General information
The OPU of the HLL displays operation of the hydraulic distributor EHS and controls
sections of the hydraulic distributor EHS according to set-up operation modes and control
algorithms.
ATTENTION: IT IS POSSIBLE TO ACTIVATE THE OPU OF THE HLL ONLY WITH THE ENGINE
RUNNING!
The OPU of the HLL has two operation modes:
- indication of operation of the hydraulic distributor EHS sections when the hydraulic
distributor is controlled directly by two joysticks (manual mode);
- control of hydraulic distributor EHS sections when the hydraulic distributor oper-
ates according to the specified algorithm (automatic mode).
Board of operation programming unit of the hydraulic lift linkage is presented in fig-
ure 2.16.6.
If the electric signals coming from the joysticks to the activated OPU of the HLL are
missing over any of channels, the annunciators "uplift" 4 (figure 2.16.6) and "lowering" 8 of
the corresponding hydraulic distributor EHS section flash one by one. In this case before
setting tractor into operation contact your dealer to eliminate the fault – it is required to
eliminate breakage in the electric circuit or replace the joystick.
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