OPERATION REMARKS The starting switch key is used also for the locks at locations 1, 2, and 3. 12.18 HANDLING THE TIRES 12.18.1 PRECAUTIONS WHEN HANDLING TIRES If any of the following defects are found in a tire, replace it with a new one. Broken or bent bead wire, or the tire is deformed. Excessive wear and the carcass ply, excluding the breaker, is exposed for more than one-fourth of the circumference. Separated tire layers. Radial cracks reach the carcass. 12.18.2 TIRE PRESSURE Measure the tire pressure before starting operations when the tires are cool.
If the tire inflation pressure is too low, the tire will be overloaded; if the pressure is too high, it will cause tire cuts and shock bursts. To prevent these problems, adjust the tire pressure, according to the table on the next page. Deflection ratio = H-h H x 100 As a guideline, the front tire’s deflection ratio (deflection/free height) when: Carrying a normal load (lift arm horizontal): about 15-25% Digging (rear wheels off ground): about 25 -35% When checking the tire inflation pressure, check also for small scratches or tire peeling, for nails or pieces of metal that may cause punctures, and for any abnormal wear.
Removing stones and rocks from the operating area and maintaining the surface extends tire life. TIRE PRESSURE VARIABLES When operating the machine on various surfaces and operations, adjust the tire pressure accordingly: Normal road surfaces, rock digging: high end of range in air pressure chart. Stockpile operations, soft ground: average air pressure in air pressure chart. Sand, not much digging force: low end of range in air pressure chart. WA450-3MC 2-75