2122.6-0000010 OM
232
6.13 Possible failures in the hydraulic system and instructions for their
troubleshooting
6.13.1 Failures of EHS distributor, failure indication, causes and
troubleshooting methods
“BELARUS-2122.6” tractors are equipped with an electro-hydraulic integrated unit
consisting of four EHS-type sections with an electro-hydraulic control of fluid consumption, an
electro-hydraulic regulator EHR, an end plate with an electromagnetic reduction valve and a
pumping cover.
A four-pin plug is connected to each section of the distributor, with pins assigned as
follows:
-
pin No1 – positive supply of the on-board circuit;
-
pin No 2 – not used;
-
pin No 3 – control signal;
-
pin No 4 – negative supply of the on-board circuit.
The sections of the distributor are controlled through channel No 3 by means of
pulse-width modulation signal, generated by electronic joysticks or by the electronic unit of
OPU of HLL.
The lower end of each section has a failure code indicator in the area of electric
connector (see fig. 6.13.1). When there is a failure in the section the indicator will provide a
code data about a failure in this section. The failure code consists of two figures (see table
6.13.1). The code is read by way of counting the number of indicator flashes: number of
flashes with a brief pause in between – first figure – long pause - -number of flashes with a
brief pause in between – second figure. For instance, to indicate a failure code “23” the
system will activate the indicator in the following way: two flashes – pause – three flashes.
If there are no failures in the distributing section the indicator is turned off.
Depending of the failure complicity rate this section operation may be blocked or
simultaneously several sections may be blocked (if there are failures in several sections).
In case there are several failures in a section at a time only one failure code will be
indicated with the following priority:
1 – failure of a position sensor;
2 – supply voltage is beyond the permitted level (the permitted level is 10,5 to 18V);
3 – current value of coils of the control valve is beyond the permitted level;
4 – other failures.
IT IS FORBIDDEN TO DISASSEMBLE THE SECTION OF THE DISTRIBUTOR
AND THE INTEGRAL UNIT DURING PERIOD OF WARRANTY. OTHERWISE THE
WARRANTY FOR DISTRIBUTOR SECTION AND THE INTEGRAL UNIT BECOMES IN-
VALID!
ATTENTION: REPAIRMENT OF EHS DISTRIBUTOR AND EHS DISTRIBUTOR
SECTIONS ELECTRONIC CONTROL SYSTEM SHALL BE CARRIED OUT ONLY BY
DEALERS. OTHERWISE THE WARRANTY FOR DISTRIBUTOR SECTION AND THE
INTEGRAL UNIT BECOMES INVALID!
IT IS FORBIDDEN TO ROTATE THE SPOOL ABOUT ITS AXES. SUCH ROTA-
TION CAN RESULT IN BREAKDOWN OF THE HYDRAULIC COMPONENTS IN THE
DISTRIBUTOR SECTION! TO DEFINE THE POSITION OF THE CENTRAL SPOOL IT IS
REQUIRED TO REMOVE THE PROTECTIVE CAP. AFTER REPAIR WORKS ARE FIN-
ISHED PUT THE CAP BACK!
ATTENTION: QUALIFIED REPLACEMENT OF FINE AND COARSE OIL FILTER-
ING ELEMENTS INCLUDED INTO THE TRACTOR SUPPLY KIT WILL NOT AFFECT
THE WARRANTY FOR THE DISTRIBUTOR!
https://tractormanualz.com/