AS ISO 7457:2021 Earth-moving machinery一Determination of turning dimensions of wheeled machines

AS ISO 7457:2021 Earth-moving machinery一Determination of turning dimensions of wheeled machines. 3.5 outer and inner tyre clearance diameter Diameter of the circular path described by the outermost point of the loaded (lower) section of the tyre located on the vertical diameter of the outermost wheel and also that of the innermost point of the innermost wheel when the machine is executing its sharpest practical turn under the conditions described in clause 7. (See figures 1 and 2.) See clause 6 for the state of loading of the machine. 3.6 non-stop 1800 turn width Minimum road width required for the tyre paths of the machine as it makes a 1800 turn without stopping. (See figure 3.) 4 Test area The test area shall be a compacted or paved surface affording good tyre adhesion, capable of displaying legible markings and resistant to defacement by turning machines. The test surface shall be visually flat, with no more than 3 % grade in any direction. The test area shall be large enough to accommodate the test machine as it negotiates the appropriate tests. 5 Test equipment The following equipment or its equivalent shall be provided. 6 Preparation for test 6.1 The track of machines having adjustable track axles shall be measured and recorded. The lyre pressures shall be adjusted to those recommended by the manufacturer of the machine. If the manufacturer specifies various pressures or ballast according to ground conditions then those specified for a hard surface shall be used. The tyre sizes and pressures used shall be recorded. 6.2 The machine to be tested shall be in its operating condition, and the equipment and the attachments with which it is equipped and their positions shall be noted. 6.3 Movable equipment shall be in its recommended transport position. 6.4 Load-carrying equipment shall be laden or empty as specified in 6.4.1 to 6.4.3 (see ISO 5010). 6.4.1 Tractor-scrapers and dumpers shall be at the manufacturer’s rated maximum gross mass and axle distribution, including the mass of the heaviest combination of equipment and attachments approved by the manufacturer, an operator of 75 kg and a full fuel tank. 6.4.2 Wheel loaders, wheel tractors, excavators and graders shall be at the manufacturer’s empty machine mass, including the mass of the heaviest combination of equipment and attachments approved by the manufacturer which produce the greatest load on the steered axle(s), an operator of 75 kg and a full...