Ways Of Changing Tractor Grip Characteristics And Passability; General Information - Belarus 80.1 Operation Manual

5.7 Ways of changing tractor grip characteristics and passability

5.7.1 General information

Tractors BELARUS-80.1/82.1/820 perform the majority of technological processes in
agricultural production in motion by way of direct implement and instrument towing by
means of pneumatic wheel tyres' grip with ground area. Tractive force developed at wheel
rim is linearly proportional to the tractor adhesive weight. That is why under certain condi-
tions with increase of tractor's operating weight, its tractive characteristics increase.
Tractors BELARUS -80.1/82.1/820 are designed for operation with certain values of
weight loads on tractor framework and undercarriage. Fulfillment of recommendations for
additional ballasting depending on operating conditions ensures the possibility of safe and
proper operation without critical tractor overloads for at least the specified service life.
The limit of increase in the adhesive weight is, in fact, the permissible load on the
tyres, which depends on the tyre size and internal pressure. In this case, the manufacturer
establishes the permissible maximum loads on the rear axle and the front axle of the trac-
tor at the maximum travel speed in transport mode.
Note - Air pressure standards in the front and rear tyres of BELARUS -
80.1/82.1/820 tractors with the current load and speed are given in subsection 4.2.8 "Se-
lecting of optimal inner pressure in tyres depending on operational conditions and load on
tractor axles, instructions for use of tyres."
Gripping features and terrain performance of tractors BELARUS -80.1/82.1/820 in
specific operating conditions depend on the following factors:
- tractor adhesive weight and ballast used in a specific tractor configuration;
- distribution of weight of tractor, ballast and implement in the tractor unit along tractor
axles;
- size of and pressure in tyres used;
- technical condition and workability of tractor undercarriage system;
- proper and timely application of recommendations of manufacturing plant for en-
hancement of tractor tractive characteristics;
- condition and properties of ground area;
- wheel tyres grip factor with ground area;
A limiting factor in the use of agricultural tractor is the terrain that is characterized by
steepness and configuration of the cultivated areas of the field, as well as their altitude
above sea level. Other iInfluencing factors of cultivated area of the field altitude are at-
mospheric pressure and ambient temperature. The engine power is reduced by 1,0 % for
each 100.0 m of altitude above sea level, while fuel consumption increases to the same
extent.
Tractors BELARUS-80.1/82.1/820 are intended primarily for lowland conditions, and
for limited use, subject to safety measures and recommendations, in areas with a significant
steepness of the slopes with altitude above sea level.
Changing of tractor BELARUS -80.1/82.1/820 terrain performance and gripping
characteristics by means of increasing the operating weight within permissible limits is
most effective in the conditions, when bearing power of soil grows up with increasing track
depth. For example, with tractor weight increase due to additional ballasting on stubble of
winter crops on mineral soils, the tractive power of tractor on the hook increases by 8.8 ...
28.3 %, depending on soil moisture.
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