The number of machines within the MTA: single- and multi-machine aggregates. A
machine performing several working functions, the process modules of which are not in-
tended for using as separate technical mean, is considered to be a single machine.
Arrangement of the tools relatively to the longitudinal plane of the tractor:
symmetrical and asymmetrical.
Arrangement relatively to the rear wheels and longitudinal plane of the tractor:
rear, left- and right-side (in the interaxle clearance between the front and rear wheels), front
and combined.
Quantity of the jobs to be performed: similar tractor-based aggregates performing
a single job; combined or complex ones performing two and more jobs simultaneously by
means of several machines; combined ones performing several jobs be means of a single
machine; universal ones equipped with replaceable tools capable of performing different op-
erations in different time.
According to the method of aggregating with the tractor, the agricultural machines are divid-
ed into the following types:
1. MOUNTED: to be fastened to the joints of the upper and lower rods of the traction
hitch mechanism at three points. The weight of the machine in the transport position is per-
ceived completely by the tractor. The constructional elements of the machine in the
transport position have no contact with the bearing area. When re-arranging the machine
from the working position to the transport one, the point of connecting the machine with the
tractor is moved forcedly to a new height.
2. SEMI-MOUNTED: to be fastened at three points to the joints of the upper and lower
rods of the traction hitch mechanism, but at only two points – to the joints of the lower roads
of the traction hitch mechanism. The weight of the machine in the transport position is per-
ceived partially by the tractor and, to a greater extent, by its own transport wheels (usually
one or two). When re-arranging the machine from the working position to the transport one,
the point of connecting the machine with the tractor is moved forcedly to a new height.
The two-point articulated joint is implemented by fastening the link pins of the machine
mounting axle with the joints of the lower rods of the traction hitch mechanism (the upper
rod is not used). The option of use of a cross-bar from the equipment of the tractor or ma-
chine is also possible.
3. SEMI-TRAILED: to be fastened commonly to the hitching mechanism at one point by
means of a hitching loop. The option of the two-point articulated joint with the mounted at-
tachment (without using the upper rod) is also possible. The weight of the machine in the
transport position is perceived partially by the tractor and, to a greater extent, by its own
transport wheels (usually at least two). When re-arranging the machine from the working
position to the transport one, the point of connecting the machine with the tractor is not re-
positioned.
The semi-trailed machines include also various general- and special-purpose transport
facilities, such as general-purpose semitrailers, tank semitrailers, dump semitrailers and
special semi-trailed transport facilities for mechanization of jobs in the agriculture. Transpor-
tation facilities aggregated by means of saddle-type coupling arrangement are particular ex-
amples of semi-trailed machines.
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