Belarus 3522.5, Operator'S Manual

Page: 317 / 340

3522.5-0000010 OM
318
7.3 Possible failures of the hydraulic lift linkage and guidelines for trouble-
shooting
7.3.1 Failures of EHS distributor, failures indication, causes and troubleshooting
method
The tractors “BELARUS” are equipped with electrohydraulic integral block consisting
of four sections of EHS type with electrohydraulic control of liquid consumption, electrohy-
draulic regulator (HER), end plate with solenoid operated pressure reducing valve and dis-
charge cap.
A four-pin connector conducting the signal is connected to each section:
- pin
№
1 – plus of the board network supply;
- pin
№
2 – is not used;
- pin
№
3 – actuating signal;
- pin
№
4 – load of the board network supply.
Distribution sections via the pin
№
3 is controlled by the pulse width modulated sig-
nal (PWM), generated by the electronic joysticks or programmable operation unit in the
hydraulic lift linkage (HLL POU).
Each section is equipped with error codes indicator, located at the bottom part in
area of the electrical connector (see Figure 7.3.1). In case any failures have detected in
the section, the indicator displays the error code for that very section. The error code con-
sists of two digits (see Table 7.3
а
). The code is read by calculation of how many times the
indicator has blinked, that is the quantity of flashes with short intervals between them indi-
cating the first digit - long indicator - the quantity of flashes with short intervals between
them indicating the second digit. For example, to indicate the digit “23” the system will op-
erate as follows: two flashes – an interval – three flashes. If there is no fault in the distribu-
tion panel, the indicator will be off.
Depending on degree of failure complexity, operation of this section or a number of
sections can be blocked in the same time (if the faults begin in several sections).
In case there are several failures in one section, only one error code is displayed by
the indicator with the following priorities:
1 – position sensor failure;
2 – power supply voltage level is beyond a permissible level (permissible level
ranges from 10.5V to 18
В
);
3 – intensity of current in the control valve coils is beyond a permissible level;
4 – other failures.
IT IS FORBIDDEN TO DISASSEMBLE THE SECTION OF THE DISTRIBUTION
VALVE AND THE INTEGRAL UNIT DURING PERIOD OF WARRANTY. OTHERWISE THE
WARRANTY FOR DISTRIBUTION VALVE SECTION AND THE INTEGRAL UNIT BE-
COMES INVALID!
ATTENTION: REPAIRMENT OF EHS DISTRIBUTION VALVE AND EHS DISTRIBU-
TION VALVE SECTIONS ELECTRONIC CONTROL SYSTEM SHALL BE CARRIED OUT
ONLY BY DEALERS. OTHERWISE THE WARRANTY FOR DISTRIBUTION VALVE SEC-
TION AND THE INTEGRAL UNIT BECOMES INVALID!
IT IS FORBIDDEN TO ROTATE THE SPOOL ABOUT ITS AXES. SUCH ROTATION
CAN RESULT IN BREAKDOWN OF THE HYDRAULIC COMPONENTS IN THE DISTRIBU-
TION VALVE SECTION. TO DETERMINE THE CENTRAL SPOOL POSITION, REMOVE THE
SAFETY CAP. AFTER THE REPAIR OPERATIONS ARE COMPLETED, PUT THE SAFETY
CAP BACK IN ITS PLACE!
ATTENTION: IN CASE IF REPLACEMENT OF THE COARSE AND FINE OIL FIL-
TER CARTRIDGES, INCLUDED IN THE LIST OF TRACTOR`S STANDARD EQUIP-
MENT, IS CARRIED OUT BY THE QUALIFIED PERSONNEL, THE WARRANTY FOR
DISTRIBUTION VALVE REMAINS VALID!
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