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 1523.5 Operator's Manual

1523.5-0000010 OM
3.2.8 Selection of optimal inner pressure in tires depending on operational condi-
tions and load on tractor axles
3.2.8.1 Selection of optimal inner pressure in tires depending on operational condi-
tions and load on tractor axles
Selection of optimal air pressure in tires of wheeled tractors and degree of its influence on
gripping abilities depend on soil type and load, applied to tractor axles. Air pressure 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 3.3.
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 differ-
ent. 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 decreases
tire life significantly.
Tractor operation with tire pressure set below the required rate, results in the following
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 fail-
ures:
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 undercarriage
(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 imple-
ment 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-124 GOST 9921-81 (it is possible to
use other tire pressure control devices with the metrological characteristics identical to
manometer MD-124).
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