Operation 3.3. Operation 3.3.16. Tyre handling Precautionary measures when handling tyres If the following defects are found in tyres, they must be replaced for safety reasons. Tread Bead wire is broken or bent, or the tyre is greatly deformed. Sidewalls Breakers Excessive wear and the carcass ply (excluding breaker) is exposed for more than 1/4 of the circumference. Damage to the carcass exceeds 1/3 of the tire width. Tyre layers are separated. Beads Radial cracks reach the carcass. Carcass Deformation or damage which makes the tyre unsuitable for use. Tyre pressure Measure the tyre pressure before starting the machine operation, when the tyres are cool.
If the tyre inflation pressure is too low, there will be overload; if it is too high, it will cause tyre cuts and shock burst. To prevent these problems, adjust the tyre inflation pressure according to the table on the next page. For operations on normal road surfaces, rock digging operations: ____________ Upper range values in air pressure chart Stockpile operations on soft ground:
____________ Average pressure values in air pressure chart Operations on sand (operations not using much digging force) ____________ Lower range values in air pressure chart Deflection ratio H h H ------------- 100 Ч = As a guideline for visual inspection, the deflection ratio of the front tyre (deflection/free height) is as follows: When carrying normal load (lift arm horizontal): approx. 15 - 25% When digging (rear wheels off ground): approx. 25 - 35% WA90-5 – VEAM270100 3-77