MTZ 1220.1, Руководство оператора

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MTZ 1220.1/1220.3 Section I. Coupling of implements
I13
Tractor loading
One of the wide spread means of
coupling is a mounted one through a rear
lift linkage. Here there is a necessity to
provide the MTA with stiffness without
worsening of tractor steerability.
Longitudinal stability is indicated by con-
trollability criterion which is equal to ratio
between load to steerable axle and bridge
to tractor operating weight:
2 , 0
10
2
≥
⋅
=
m
T
К y
n
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 wa-
ter filling up and air discharge are ef-
fected.
The tire is to be filled up as per standards
(to 75% of its volume). Water (solution)
leakage through a combined valve outlet
is an indicator that the tire is filled up. As
soon as the tire is filled up, screw the nip-
ple back and pressure the tire up to its
operative standards.
It is required to add CaCl
2
in water on the
basis of 300 g/l of water (a freezing-point
is 25
°
С ) in cold seasons.
IMPORTANT! When preparing a solu-
tion, do not pour water in CaCl
2
to avoid
formation of hardly dissoluble clots of
calcium chloride.
If a tractor is equipped with a front hitch
linkage, a longitudinal stability of the
agricultural
aggregated unit can be
provided with combined machines of front
and rear location.
Longitudinal stability can be approximately
assessed with help of diagram (see fig.
G-18 on page G 16).
The diagram allows to determine the fol-
lowing parameters during tractor loading
through rear lift linkage:
• tractor configuration (without ballast,
ballast, water) according to the set
weight and center of mass overhang of
the implement coupled;
• permitted weight of the implement
coupled according to the set center of
mass overhang and vice versa at
Ку = 0.2 (curves А , В , С );
• permitted weight of the implement
coupled according to the set center of
mass overhang and vice versa on the
basis of maximum carrying capacity of
rear lift linkage (curve D). Contingency
situation.
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Fig. I-17.
Water
Air
Water