Spicer Deflation Device Gives Trucks Go-Ability

摘要

Got sand? They do in east-central Min-nesota, where glacial lakes and rivers many thousands of years ago depos-ited silt that's now deep and plentiful. The sand is both useful, as an ingredient in concrete, and an impediment, as it's tough for mixer trucks to traverse work sites. Off-road enthusiasts who frequent sand dunes know that bleeding air from a vehicle's tires lets them almost float over the soft ground instead of bogging down in their own ruts. When the four-wheeler returns to hard roads, its driver has to pull out hoses to pump the tires back up. But on-board systems available on many heavy vocational trucks do it quickly and conveniently.