892-0000010B OM
201
5.3 Three-point rear lift linkage
ATTENTION: BEFORE LEAVING THE TRACTOR FOR ANY TIME PERIOD, THE
LINKED IMPLEMENT SHALL BE PUT ON THE GROUND INDISPENSABLY!
ATTENTION: MAXIMUM LIFTING POWER VALUE OF LIFT LINKAGE AT THE SUS-
PENSION AXIS DETERMINATES TECHNICAL OPERABILITY OF THE LIFT LINKAGE, BUT
NOT PERMISSIBLE MASS OF THE IMPLEMENT COUPLED THROUGH IT. PERMISSIBLE
MASS OF THE IMPLEMENT DEPENDS ON THE CENTROID OVERHANGING LENGTH
AGAINST THE SUSPENSION AXIS, AND IT IS LIMITED BY PERMISSIBLE LOADS ON THE
TRACTOR AND BY CONTROLLABILITY CRITERION!
Rear lift linkage corresponds to the requirements of ISO 4254-3.
Three-point rear lift linkage of BELARUS-892/892.2 is made according to State GOST
10677 and ISO 730. Basic parameters of RLL, specified in Table 5.3.1 and in Figure 5.3.1,
parameters are given with standard rear tires (16.9R38 – each of single and twin tire on
BELARUS-892 tractor and 18.4R34(F-11) both single and twin on BELARUS-892.2 tractor),
mounted to the tractor and with standard static radius, specified by the manufacturer.
Rear lift linkage consists of three links (upper one and two lower links) with front ends
articulated via hinged joint with the tractor, and with rear ends articulated with free hinged
joint for the purpose of connection to the attachment pins of the implements coupled. RLL
is designed for connection of implements for tail positioning to a tractor, for link power trans-
fer during operation and adjustment of their position during operation, or run at transport
position. RLL provides for coupling of the following types of implements and instruments:
- mounted implement fixed in three points (upper one and lower links);
- semi-mounted (lower links);
- semi-mounted with a cross arm to the suspension axis of lower links.
ATTENTION: MOUNTING OF A CROSS ARM OR TRAILING SUSPENSION AXIS,
BEING THE PART OF IMPLEMENTS SET FOR COUPLING OF SEMI-MOUNTED, SEMI-
TRAILED AND TRAILED IMPLEMENTS FOR FULFILLMENT OF DIFFERENT WORKS
WHEN SPEED DOES NOT EXCEEDS 15 KM/H, TO THE ENDS OF LOWER LINKS OF
REAR LIFT LINKAGE!
Sizes and structure of RLL of BELARUS-892/892.2 tractors make it possible to couple
all implements, having the corresponding dimensions of attachment elements of connection
triangle shown in RLL diagram
Rear lift linkage diagram of type LL-2 with hydraulic lift is shown in Figure 5.3.1.
For protection of coupled implements from rocking length adjustable limit buckles are
used.
To ensure the implement is in the right position the following adjustments of RLL by means
of upper link, crossbars and limit buckles are provided in vertical and horizontal plane:
1 Modification of length of upper link
It is carried out in order to ensure penetration of operative parts (alignment of running
depth of operative parts located one after another along the tractor run). If mounted plough
carriage reaches forward along the tractor run and the front plough body cuts deeper than
the rear one, extend the upper link; and if the front plough body cuts for the more shallow
depth than the rear one, the upper link shall be shortened.
2 Modification of length of left or right lifting rods.
The modification is carried out in the following cases:
- to ensure the implement is in the horizontal plane;
- to ensure the even depth processing with operative parts of tractor-mounted ma-
chine across the width of cut;
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