Selection Of Optimal Inner Pressure In Tires Depending On Operational Conditions And Load On Tractor Axles, Instructions For Tire Use; Selection Of Optimal Inner Pressure In Tires Depending On Operational Conditions And Load On Tractor Axles - Belarus 1822.3 Operator's Manual

4.2.8 Selection of optimal inner pressure in tires depending on operational
conditions and load on tractor axles, instructions for tire use
4.2.8.1 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 rate 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 to select operation mode at various inner pressures and speeds are set forth by a tire
manufacturer and are provided in table 4.1.
The pressure value depends on travel speed and weight loads on tractor axles, cre-
ated 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. Therefore 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 follow-
ing wheel failures:
- tire turning on rims;
- wearing of tire bead against rim edge;
- occurrence of cracks on tire sides;
- ply separation or rupture of a tire;
- tear-out of tire valve (for tubed tires);
Operation with tire pressure higher than the rated pressure 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.
Extra duty operation resulting in 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
LOADS AND SPEEDS EFFECTIVE FOR THE KIND OF PERATION BEING CARRIED
OUT!
Correct choosing tire pressure as well as identifying if it is necessary to mount ballast
weights, their mass and type is possible only after defining a 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 determined only by way of practical weighing the tractor
with the implement coupled.
The method of identifying load on front and rear wheels of the tractor by way of
weighing is presented in section 5 "Coupling of implements".
To check tire pressure use properly-functioning devices with scale interval not more
than 10 kPa. This will ensure adequacy of measurements. The permissible limit deviations
for tire pressure are ± 10 kPa according to pressure gage readings.
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