BELARUS-
1221.2/1221В.2/1221.3
Aggregation
182
speed in the most favourable.
In the tractor operation there are
two main speed modes:
a)
operating
This mode is the main one. The variation of the operating motion speed which affects
the quality of performing the job in accordance with the agrotechnical requirements. The
operating manuals for individual machines contain the allowable operating speed ranges.
Any variation of the working motion speed of the tractor with the aggregated machine in-
cluding the operating manoeuvring during the operating motion is only allowable within the
limits to be determined by the agrotechnical requirements. The initial operating speed is
set usually within these limits together with the machine grasp width and operating depth
(fit).
б
)
auxiliary mode
This mode is characterized by the tractor motion speed with the aggregated machine in
the near transport speed (in idling when performing the turns and motion to another place)
with the operating elements engaged. The speed mode of the tractor with the machine in
the near-transport mode is generally limited by the safety requirements. Due to relatively
short duration of the turns and necessity of following the guidelines for limitation the trans-
port speed when moving from one field to another, the respective tractor speed in the
mode is often close to the operating one.
If the machine to be aggregated has been selected, it is only necessary to determine
the operating speed and respective gear.
The operating speed of the tractors during the operation under field conditions is limited
first of all by the quality of the work to be performed. Besides, for traction machines it is
limited by the tractive and hitching capabilities of the tractor and for traction and driven ag-
gregates – by the allowable power of the PTO and hydraulic takeoff as well as by the
throughput capacities of the machine tools.
Checking the correctness of formation of the aggregate according to the rota-
tional speed of the engine crankshaft.
In practice, the operating motion speed of the tractor is selected based on the ta-
chospeedometer readings. While knowing the range of agrotechenically allowable speeds,
the tractor gear (motion speed), in which the tractor shall enter this range, is determined.
The normal load on the tractor should be considered such a load, at which the readings
of the crankshaft rotational speed on the tachospeedometer would be lower (by not more
than 6%) than the rated value specified in the manufacturer’s documentation. Drop of the
rotational speed by the value exceeding 6% indicates the engine overloading. The in-
crease of the rotational speed above the rated one indicates the engine underloading.
The main condition of the optimal aggregation of the BELARUS tractor is proper use of
the engine power which is characterized by the load factor expressing the degree of use of
the tractor’s rated power for performing the jobs by the aggregated agricultural machines.
For each group of agricultural operations objectively approximate values of the degree of
use of the engine’s rated power exist. On the average the reserve power should make up
10…15% of the engine rated power.
The correctly selected operating mode of the tractor is understood as such aggregation
of the tractor with observing all the operating rules and limitations, which ensure not only
performance of the work in accordance with the agrotechnical requirements for the work-
ing operation to be performed, such as engine loading mode, speed mode of the aggre-
gate, allowable skidding mode as well as compliance with all the recommendations for
safe use of the tractor (speed selection, loading modes).
The engine loading degree can be varied by increasing or reducing the number of ma-
Summary of Contents for 1221.2
Page 1: ...BELARUS 1221 2 1221В 2 1221 3 1221 0000010РЭ OPERATORS MANUAL 2009 ...
Page 290: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 293 Electrical scheme of tractor connections ...
Page 291: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 294 Variants of tractor connections ...
Page 293: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 290 826 3805010 instrument board scheme ...
