b. Checking the fitting of the tractor within the row-spacing of the crops to be cultivated
with determining:
the correspondence of track and tyre profile width;
agrotechnical clearance;
protective zones to the tyres.
Stage VIII
Checking the total cross-country ability, static stability on slopes and efficiency of
brakes under local conditions:
a. possibility of overcoming the ups and downs by the tractor with the machine loaded
with process material;
b. possibility of motion along the slope.
Assess the clearance value and steerability of the tractor aggregated. During the motion, the
front wheels of the tractor shall not be taken off the road surface. The front axle of the tractor
shall perceive at least 20% of the load (steerability criterion К
s
≥ 0.2) from its own operating
weight in any case of its use.
Stage IX
Carrying out the control shifts for the purpose of determining the operating charac-
teristics:
a. time and labour intensity of forming the MTA;
b. average operating speed;
c. productivity per 1 hour of basic (shift, operating time);
d. volume of the work performed for the reference time;
e. hourly (specific) fuel consumption.
Checking the correctness of forming the machine-tractor aggregate
The operation of the tractor with the aggregated machines being either overloaded or un-
derloaded shall not be allowed. In the first case, there will be increased wear of the parts of
the tractor, excessive fuel consumption and decrease of the productivity of the aggregate
while in the second case there will decrease of the economic characteristics and, particular-
ly, productivity and increase of the fuel consumption.
Therefore, the tractor driver shall first of all make sure that the MTA has been formed cor-
rectly and its recommended speed in the most favourable.
In the tractor operation there are two main speed modes: operating motion speed and
near-transport speed (in idling when performing the turns and motion to another place) with
the tools disengaged. The main of these modes is the operating speed, the variation of
which affects the quality of performing the job in accordance with the agrotechnical require-
ments. 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 including 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. 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 transport speed when moving from one field to another, the
respective tractor speed in the mode is often close to the operating one.
To Next Page
Loading...