The value of the load on the coupling arrangement of the machine can be determined us-
ing the following two methods:
1. On a balance.
The machine is placed on the balance in such a way that there would be only coupling ar-
rangement of the machine on the balance with the support of the hitching loop (as regards
the trailed and semi-trailed machines) or mounting axle (as regards the semi-mounted ma-
chines) resting upon the platform through a stand with the weight of less than 50 kg and
height of 300…500 mm, while the remaining (major) portion of the machine would be out-
side the weighing zone. The load on the coupling arrangement of the machine can be only
determined on a platform balance provided the length of the coupling arrangement is suffi-
cient to place the machine outside the weighing zone.
2. By means of a dynamometer.
The load on the coupling arrangement of the machine can be determined by weighing the
coupling arrangement on a beam crane through a dynamometer.
Allowable loads Т on the axles of the tractor:
but not more than the total load-carrying capacity of single tyres of rear or front wheels.
In case of twinning the wheels with the tyres of the same or different standard sizes, their
total load-carrying capacity shall be reduced by 20%.
In case of setting the wheel track exceeding 1800 mm, the loads on the axles shall be re-
duced by 5% per each 100 mm of increase of the track.
In every case, the total load on the tractor wheels shall not exceed Тf+Тr kN. (7000 kgf)
The soil compaction depends considerably on the number of passages of the MTA on the
track. Therefore, it becomes expedient to reduce the number of passages at the cost of
combining the operations by means of combined aggregates.
Twinning the wheels makes it possible to reduce considerably the specific pressure on the
soil and preserve the soil structure, especially, on moistened fields.
Twinning the wheels on dense soils makes it possible to improve the tractive and hitching
capabilities of the power source, especially in combination with correct ballasting or loading
of the tractor.
The steerability criterion K
s
is determined from the formula:
K
s
= (m
f
·g) / М
т
·g ≥ 0.2,
where g=9.8 m/s; m
f
is a value of a portion of the operating weight of the tractor within the
MTA perceived by the front axle of the tractor, kg; M
T
is the standard operating weight of the
tractor, kg.
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