Selecting Of Optimal Inner Pressure In Tyres Depending On Operational Conditions And Load On Tractor Axles, Instructions For Use Of Tyres; Selection Of Optimal Inner Pressure In Tyres Depending On Operational Condi- Tions And Load On Tractor Axles - Belarus 80.1 Operation Manual

4.2.8 Selecting of optimal inner pressure in tyres depending on operational
conditions and load on tractor axles, instructions for use of tyres
4.2.8.1 Selection of optimal inner pressure in tyres depending on operational condi-
tions and load on tractor axles
Selecting optimal air pressure in tyres of wheeled tractors and rate of its influence
on tyre's gripping abilities depend on type of work, soil type and load applied to tractor ax-
les. Air pressure in tyres influences the wheel point being in contact with soil, and affects
its gripping abilities as well as tractor operational performance depending on soil condi-
tions. Rates of loads on tyres to select operation mode at various inflation pressures and
speeds are set forth by the tyre manufacturer and are provided in table 4.2.2.
The pressure value depends on travel speed and weight loads on tractor tyres, cre-
ated by weight of coupled implements with due account for tractor own weight and ballast
weight as well as operation conditions.
Tyre inflation pressure is different for each specific case of tractor coupling with im-
plements. Therefore, if tractor operational conditions are changed it is required to check
and if necessary adjust the pressure value in tyres. Failure to comply with pressure rates
decreases tyre life significantly.
Tractor operation with tyre pressure set below the required level results in the fol-
lowing wheel failures:
- tyre turn-through against rims;
- wearing of tyre bead against rim edge;
- cracks on tyre sidewalls;
- ply separation or rupture of tyre carcass;
- tear-out of tyre valve (for tube tyres);
Operation with tyre pressure set higher than the norm, results in the following wheel
failures:
- noticeable increase in wear of tyres;
- stretching of carcass plies and decrease of tyre flexibility;
- increased skidding of wheels;
- increased sensitivity to impacts and cuts.
Operation with overload including exceeding the maximal load capacity of tyres (for
given pressure and speed) and tractor axles is a reason for failures and damages not only
to the undercarriage (tyre carcass rupture, etc.) but also to other units and parts of the
tractor, which can lead to accidents and decrease the tractor life span in general.
ATTENTION: ALWAYS SET TYRE PRESSURE WITH DUE ACCOUNT FOR LOAD
AND SPEED EFFECTIVE FOR THE KIND OF OPERATION BEING CARRIED OUT!
It is possible to choose tyre pressure correctly and identify if it is necessary to
mount ballast weights, their mass and type only after defining load value on tractor axles.
The exact load value for a specific case of tractor use, which is applied to front or
rear wheels of the tractor, can be defined only by practical weighing the tractor with the
implement coupled.
The method of identifying load value on front and rear wheels of the tractor by
weighing is described in section 5 "Coupling of implements".
To check tyre pressure, use manometer МД-214 GOST 9921-81 for tyre inflation
pressure control (it is permitted to use other tyre inflation pressure control devices with
metrological parameters identical to those of manometer МД-214).
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