Selection Of Optimal Inner Pressure In Tires Depending On Operational Conditions And Load On Tractor Axles; Selection Of Optimal Inner Pressure In Tires Depending On Operational Conditions; And Load On Tractor Axles - Belarus 2022.6 Operator's Manual

3.2.8 Selection of optimal inner pressure in tires depending on operational
conditions and load on tractor axles
3.2.8.1 Selection of optimal inner pressure in tires depending on operational
conditions and load on tractor axles
Selection of optimal air pressure in tires of wheeled tractors and degree of its influ-
ence on gripping abilities depend on soil type and load, applied to tractor axles. Air pres-
sure in tires influences the wheel point being in contact with soil, and affects its gripping
abilities as well as tractor operational performance depending on soil conditions. Rates of
loads on tires for selection of operation mode at various inner pressure and speed are set
forth by a tire manufacturer and are provided in table 3.2.2.
Pressure value depends on travel speed and weight loads on tractor axles, created
by weight of coupled implements with due account for tractor own weight and ballast
weight and also operation conditions.
Inner pressure in tires for each specific case of tractor coupling with implements is
different. That is why if tractor operational conditions are changed, it is required to check
and if necessary, adjust pressure value in tires. Failure to comply with pressure rates de-
creases tire life significantly.
Tractor operation with tire pressure set below the required rate, results in the follow-
ing wheel failures:
- tire turning on rims;
- wearing of tire bead against rim edge;
- cracks on tire sides appear;
- ply separation or rupture of a tire;
- tear-out of tire valve (for tubed tires);
Operation with tire pressure set higher than the norm, results in the following wheel
failures:
- noticeable increased wear of tires;
- stretching of carcass layers and decrease of tire flexibility;
- increased skidding of wheels;
- increased sensitivity to impacts and cuts.
Operation overload including excess of max. load capacity (for given pressure and
speed) of tires and tractor axles is a reason for failures and damages not only to the un-
dercarriage (tire carcass rupture, etc.) but also to other units and parts of the tractor, which
can lead to accidents and decrease of the tractor life span in general.
ATTENTION: ALWAYS SET TIRE PRESSURE WITH DUE ACCOUNT FOR LOAD
AND SPEED EFFECTIVE FOR THE KIND OF OPERATION BEING CARRIED OUT!
It is possible to choose tire 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 and
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 given in section 4 "Coupling of implements".
To check tire pressure use pressure gage MD-214 GOST 9921-81 (it is possible to
use other tire pressure control devices with the metrological characteristics identical to
manometer MD-214).
Rates of admissible loads on single tires of tractors "BELARUS-2022.6" for selec-
tion of operation mode at various tire inner pressure and speed are given in table 3.2.2.
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2022.6-0000010 OM