BUSHING 3G9215 - Caterpillar

2Inflation of Tires with Nitrogen (N)
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.
Proper nitrogen inflation equipment, and training in using the equipment, are necessary to avoid over inflation. A tire blowout or rim failure can result from improper or misused equipment.
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 (4 or more years). It also reduces the corrosion of rim components and the resultant disassembly problems.
Use a self-attaching inflation chuck and stand behind the tire tread while inflating a tire.
Set the tire inflation equipment regulator at no more than 140 kPa (20 psi) over the recommended tire pressure.
Use only Caterpillar Part 6V4040 Nitrogen Tire Inflation Group, or equivalent, to inflate tires from a nitrogen gas cylinder. Refer to Special Instruction, Form SMHS7867, for tire inflation instructions.Use the same tire pressures for nitrogen inflation that are used for air inflation. Consult your tire dealer for operating pressures.Shipping Pressures
The charts below are for shipping pressures only. Consult your tire dealer for operating pressures.
651E Tractor
651E Scraper
657E Tractor
657E Scraper
Adjusted Inflation Pressures
A tire inflated in a warm shop area will be underinflated if the machine works in freezing temperatures. Low pressure shortens the life of a tire.If the machine is operated in freezing temperatures, consult the Cold Weather Operation Guide, Form SEBU5338, for adjusted inflation pressures.