The possibility of aggregation and selection of the machines for the tractor can be de-
termined independently by experimental or calculating method or on the basis of tests per-
formed previously by the respective organizations, for example, zonal machine-testing sta-
tions, as well as recommendations of the machine manufacturer.
Calculation method of aggregation. When using the calculation method, the calcula-
tions are performed according to the appropriate formulae on the basis of the initial data and
technical reference literature, the respective characteristics of selection of the tractor and
machine are compared and on the basis of this comparison the conclusion on the possibility
of their aggregation is made. This method can be recommended for approximate calcula-
tions in cases where experimental data are unavailable or where it is necessary to know
immediately the approximate composition of the machine-tractor aggregate. Since the calcu-
lations use the medium values and all the peculiarities of the aggregation may not be taken
into account, the tractor-based aggregate formed in such a way can be inoperable in some
cases and its additional adjustment in the process of field work can be required. This meth-
od can be recommended for approximate calculations in cases where experimental data are
unavailable or where it is necessary to know immediately the approximate composition of
the machine-tractor aggregate.
When using reliable data and taking into account all the power inputs and local condi-
tions, the possibility of aggregation of the machine with the tractor can be checked sufficient-
ly accurately. Such operational calculations are recommended prior to purchasing a new
machine.
Experimental method of aggregation. When using the experimental method, the ma-
chines are selected and aggregates are further completed by performing the practical check
on the basis of the available operational documentation, normative and reference data as
well as with the account of the gained experience of forming the aggregates at the specific
farm or enterprise.
The initial data for selecting the machines to be aggregated with the tractors include the
kind and characteristic of the soil to be ploughed or crops to be cultivated, dimensions and
relief of the fields, agrotechnical requirements for the work to be performed (operating
speed, agrotechnical clearance, track, tyre width, working travel direction, operation weight,
aggregation method, vertical load on the coupling arrangement), draught resistance and
power requirements of the working machines, haulage capacity and power of the tractor.
When selecting the machines, pay special attention to the variable characteristics of the
conditions of operation of the agricultural machinery under field conditions. For example, the
tractor with the drawbar category of 1.4 shall work with the three-furrow plough with the
grasp width of 1.5 m under usual conditions, but on the areas with light soils and without
slopes it ensures the operation of the four-furrow plough with the grasp width of 1.6 m.
When forming the machine-tractor aggregate, it is extremely significant to select correctly
the gear, on which the tractor shall work. Of course, it would be more beneficial to work at
high speed and with large grasp width and operating depth of the tools of the aggregated
machines. Unfortunately, it is impossible to increase the speed of motion of the aggregate
and its grasp width and operating depth. The higher is the speed, the lesser is the tractor’s
tractive force, therefore, it is necessary to reduce the grasp width and operating depth and
vice versa. It is necessary to keep also in mind that the speed and operating depth are often
limited by the agrotechnical requirements.
The determination and assessment of the possibility of aggregation of the MTZ tractor
with agricultural machines shall be performed in several stages.
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