MTZ 1220.1, Руководство оператора

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MTZ 1220.1/1220.3 Section I. Coupling of implements
I 16
Controllability criterion at implement coupl-
ing through DH is achieved without front
ballast. The ballast can be used for im-
provement of haulage-adhesion features
of a tractor.
Allowable loads on the axles:
Tractor axle Т
min
... Т
max
, kN
Front Т f = 10...40
Rear Т r = 20...65
but not exceeding accumulated loading
capacity of single tires of rear and front
wheels.
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%.
In case of setting the wheel track ex-
ceeding 1800 mm, the loads on the axles
shall be reduced by 5% per each 100
mm of the track increase.
In all cases general load on tractor wheels
shall not exceed
Тп + Тз
≤
80 kN.
Received loads on tractor and imple-
ments` driving machines, used in the
fields, grasslands and cattle-runs shall be
checked for consistency with standard
values of maximum floor pressure and soil
standard mechanical stress. According to
the State Standard (GOST) there is a
complicated system for determining of the
marked values. Pressure on the soil is ap-
proximately higher than tire pressure by
0.02 MPa (max/ value shall be chosen).
The soil compaction depends consid-
erably 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 pres-
sure 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 cor-
rect ballasting or loading of the tractor.
Depending on the loads on tractor axles,
created by the devices couples, it is ne-
cessary to set the required pressure in
tires (see. Table of tires carrying capacity
at different speeds of tractor run).
Tires standard
size
Speed, km/h Load per one tire, kN
and corresponding pressure, MPa
Water quantity
(solution) per one tire, l
0,10 0,12 0,14 0,16 0,18 0,20
14,9R24 30
10 13,8
17,0 15,3
18,9 16,8
20,7 18,2
22,4 172
18,4R38 30
10 24,4
30,0 27,2
33,4 29,7
36,6 32,1
39,5
45,0
412
16,9R38 30
8
18,3 20,3 22,3
27,0 24,3
29,8
31,2 34,0
356
11,2R28 20
10 9,8
11,9
10,9
13,4 11,9
14,6 12,8
15,6 13,8
16,8 90
11,2R42 20
10 12,7
15,5 13,5
16,5 14,8
18,0 15,8
19,4 120