VALVE-CONTROL 4731910 - Caterpillar

Inflation of Tires with Nitrogen
Improperly inflated tires can cause excessive heat buildup, resulting in blowouts.Proper nitrogen inflation equipment and training in its use are necessary to avoid over inflation. A tire blowout or rim failure can result from improper or misused equipment.
Over or under inflated tires can cause excessive or uneven tire wear or rim damage.Keep the valve caps on to prevent dirt from entering the valve stems. Otherwise, valve damage can occur.
Caterpillar recommends using dry nitrogen (N2) gas for both tire inflation and tire pressure adjustments on all rubber tired machines. Nitrogen is an inert gas and will not support combustion inside the tire.In addition to reducing the risk of an explosion, using nitrogen instead of air to inflate tires lessens the slow oxidation of the rubber and the accompanying gradual tire deterioration. This is especially important for tires that have an expected long service life (four or more years). It also reduces the corrosion of rim components and the resultant disassembly problems.
Set the tire inflation equipment regulator at no more than 140 kPa (20 psi) over the recommended tire pressure.
Because a fully charged nitrogen cylinder's pressure is approximately 15 000 kPa (2200 psi), a tire blowout and/or rim failure can occur if the inflation equipment is not used correctly.
Stand behind the tread when inflating a tire.
Use only a Caterpillar 6V4040 Nitrogen Tire Inflation Group, or equivalent, to inflate tires from a nitrogen gas cylinder. See Special Instruction, Form SMHS7867, for tire inflation instructions.Use the same tire pressures for nitrogen inflation as would be used for air inflation. Consult your tire dealer for operating pressures.Have your tire dealer inspect tires with deep cuts or gouges.Measure the tire pressure if a tire appears improperly inflated.Check the inflation pressure with the tires cold and at the same outside temperature in which the machine will operate. Use a Caterpillar 4S6524 or 1P545 Tire Pressure Gauge, or equivalent.When inflating tires in a heated area, make allowances in pressure for cold, outside temperatures. See the Cold Weather Recommendations Operation and Maintenance Guide, Form SEBU5898.Tire Pressures
Consult your tire dealer for the operating pressure when the machine is put into operation.
The inflation pressures shown in the chart below are cold inflation operating and shipping pressures for tires on Caterpillar machines.The inflation pressure is based on the weight of a ready-to-work machine without attachments, at rated payload, and in average operating conditions. Pressures for each application may need to be varied from those shown and should always be obtained from your tire supplier. The "R" in tire size denotes radial construction.