6. WHEELS AND TYRES
Tyres play vital role in transportation and agriculture operations so their importance became a
necessity tractor/ automobiles. Here we will discuss only pneumatic tyres.
On any tyre there is some marking which represents its size & capacity e.g. Tyre marking is
13.6x28, 12 ply rating i.e. 13.6 inch is the section width, 28 inch is the bead diameter. Ply rating
doesn't show that the same No. of plies are inserted in tyre. It is only comparative measure of
the load carrying capacity (L.C.C) of tyre. As more ply rating shows more L.C.C. at the same
time as L.C.C. increases the shocks absorption capacity decreases.
It is the most important factor in the efficient performance of tractor it should be used only as per
company recommendation. In general, tractor is considered for two types of work:
l Work on soft soil where maximum adhesion is needed. In this case there will be use of
lowest pressure compatible with the load carried.
l Work on hard ground and roads, towing etc; In this case there will be use of maximum
pressure.
6.1 IN FIELD OPERATIONS
6.1.1 Correct Pressure
Good adherence by dirt grousers.
Good cleaning of the tread
6.1.2 Insufficient Pressure
Reduce adherence through lack of tyre grip.
Deterioration of tyre casing by traction forces.
6.1.3 Over Pressure
Reduce group due to lack of cleaning
Deterioration due to compacted ground.
Overall Tread Width
Section Width
Tread Width
Tread Depth.
Section Height
Rim Width
Normal Rim
Diameter
Loaded Radius
Overall Tread Diameter
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Operator Manual
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