2Unit Of Electronic Joysticks; General Information; Unit Of Electronic Joysticks Eju-01 - Belarus 3522.5 Operator's Manual

The electronic system operates in the following way. After the engine is started the sup-
ply voltage is delivered to the operation programming unit of the hydraulic lift linkage (OPU of
HLL) 33 (figure 2.2.1). OPU of HLL checks the control system elements for function and in-
forms of the system state after the check is completed. The system is controlled by means of
joysticks 35 (figure 2.2.1) or by the operation programming unit OPU of the HLL. OPU of the
HLL performs programming of order of sections operation or exercise of algorithms pro-
grammed before and kept in the memory of the operation programming unit of the HLL. It is
possible to control the hydraulic distributor EHS sections only with joysticks, with OPU of the
HLL turned off.
2.16.2 Unit of electronic joysticks

2.16.2.1 General information

Two types of units of electronic joysticks can be installed on your tractor – EJU-01
or "BOCORO" which are interchangeable, but have some differences in control of sections
of the hydraulic distributor EHS.
If there are some failures in the hydraulic distributor sections, a failure code is dis-
played by a corresponding annunciator 5 (figure 2.16.1).
The failures detected shall be eliminated in accordance with the instructions of sub-
section 7.1.3 "Failures of the hydraulic distributor EHS. Failure indication, causes and
ways of elimination".

2.16.2.2 Unit of electronic joysticks EJU-01

Unit of electronic joysticks EJU-01 is presented in figure 2.16.3.
1, 5 – button to turn on fixed flow; 2 – joystick to control sections No 1 and No 2 of
the hydraulic distributor EHS; 3 – board announcing EJU operation modes; 4 – joystick to
control sections No 3 and No 4 of the hydraulic distributor EHS.
The joystick 2 (figure 2.16.3) controls sections No 1 and No 2, and the joystick 4
controls sections No 3 and No 4. Moving the handle of the joystick 2 forward means "low-
ering" over section No 1. Moving the handle of the joystick 2 backward means "uplift" over
section No 1. Moving the handle of the joystick 2 to the right means "lowering" over section
No 2. Moving the handle of the joystick 2 to the left means "uplift" over section No 2. Mov-
ing the handle of the joystick 4 forward means "lowering" over section No 3. Moving the
handle of the joystick 4 backward means "uplift" over section No 3. Moving the handle of
the joystick 4 to the right means "lowering" over section No 4. Moving the handle of the
joystick 4 to the left means "uplift" over section No 4. As the abovestated actions are car-
ried out a corresponding annunciator lights up on board 3 and the corresponding annun-
ciators and indicators light up on OPU of HLL if turned on. Oil flow value is proportional to
the value of the joystick handle deviation from the neutral position.
Figure 2.16.3 – Unit of electronic joysticks EJU-01
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