Belarus 1221.2, Руководство оператора

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BELARUS- 1221.2/1221В.2/1221.3 Aggregation
201
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:
Axle Range of the loads, min....max*, kN
Front Т f 11...40
Rear Т r 40...60
Total 80
*Note.
1. The load on the front or rear axle should not be more than the total load-carrying
capacity of single tyres of rear or front wheels.
2. In case of twinning the wheels with the tyres of the same or different standard sizes,
their total load-carrying capacity should be reduced by 20%.
3. In case of setting the wheel track exceeding 1800 mm, the loads on the axles shall
be reduced by 5% per each 100 mm of the track increase.
The soil compaction depends considerably on the number of passages of the tractor
with the aggregated machines. 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, 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.
One of the wide spread means or aggregation is a hitched one through a rear hitch lin-
kage. Here there is a necessity to provide the MTA with stiffness without worsening of trac-
tor steerability.
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 (without the machine), kg.
The required controllability criterion is achieved by means of front ballast weights installation.
If that is not enough – water (solution) is poured in the tires of front wheels.
To fill the tires up with water (solution), do the following:
• release the wheels from loading;
• turn a wheel getting a nipple up;
• unscrew the nipple and set a combined valve (“air-water”) in through which water filling
up and air discharge are effected.