Hydraulic Lift Linkage (Hll); General Information - Belarus 1822.3 Operator's Manual

3.15 Hydraulic lift linkage (HLL)

3.15.1 General information

The hydraulic lift linkage ensures operation of the linkage and hydraulic working
units of agricultural implements coupled with the tractor. It provides a possibility of using
depth, draft, position or combined means for adjusting running depth of agricultural ma-
chines and implements. The rear lift linkage is operated by a regulator with electromag-
netic control, that ensures draft, position, combined means of control when operating with
mounted and semi-mounted implements.
The hydraulic lift linkage shown includes the following main components:
o a welded oil tank 2 (figure 3.15.1) with a filler neck 1, mounted on the upper sur-
face of the coupling body;
o arms 4, controlling spools of the sections of the "BOSCH" integrated unit 5;
o a gear-type oil pump 14 with a drive 15, proving 1890 rpm of the pump at rated
speed of the engine, it is mounted on the left of the coupling body;
o high pressure hose 12;
o drain oil filter 10 with a free drain clutch 9 (free drain is provided to meet the re-
quirement of coupling the agricultural machines that have a hydraulic drive for working unit
constant operation (hydraulic motor), for example seeders);
o low-pressure pipelines 7, 8, 11.
Drainage from the RLL hydraulic cylinder rod end is provided to prevent environ-
mental discharge of oil.
Note – A hydraulic unit
unit.
1 – filler neck of HLL tank; 2 – HLL oil tank; 3 – oil level gage; 4 – arms to control HLL valve group
sections; 5 – valve group ("BOSCH" integrated unit); 6 – pressure pipe; 7, 8,11 – low-pressure oil
pipelines; 9 – free-drain clutch; 10 – drain oil filter; 12 – high-pressure delivery hose; 13– oil pipe-
line for hydraulic cylinder drain; 14 – HLL oil pump; 15 – oil pump drive; 16 – oil tank breather.
Figure 3.15.1 – Location of lift linkage components on the tractor
70-1523.1 may be installed instead of "BOSCH" integrated
134
https://tractormanualz.com/
2022.3-0000010 OM