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"Pressure at the fuel injectors has increased from 15,000 psi a few years ago to nearly 30,000 psi on new engines," says Pete Brown of Caterpillar''s engine applications group. "To get these higher pressures, fuel pumps are built to closer tolerances. Dirt in the fuel is like sandpaper, and it will definitely cause greater wear."To meet the challenge, Cat''s newest engines are equipped with increased water-sensing and fuel-filtering capabilities as well as a filter on the fuel tank breather. Primary fuel filters, once designed to remove 150-micron particles, are now rated for 10 microns. Secondary filters, once sized to remove 10-micron particles, are now rated for 2 microns. And the new high-efficiency filters can remove up to 99% of particles above those rated sizes compared to the 50% efficiency of older nominal filters. Filter improvements are also available for storage tanks. "Tank filters are typically rated at 10 microns nominal, so they take out 50% of particles greater than 10 microns in size. Tank filters with higher efficiencies, ratings down to 2 microns and water-absorbing capabilities, are now available," says Gall.

GJB has owned several utility tractors but says his old 500 Ford is his favorite, thanks to its lift capacity, fuel usage, and overall performance. "We have never had to repair the little beast except for oil, filters, tires," he says.In-futures says, "I have a 5220 John Deere 2WD with synchro trans. It is a delight to drive, and visibility is great."Surf for used utilitiesThe Internet is a great resource for anyone in the market for just about anything, including used utility tractors. Manufacturer sites like John Deere''s machinefinder.com, Machine Locator at agcocorp.com, and the used equipment section at caseih.com can help you find just what you''re looking for. Chances are your favorite manufacturer offers a similar service.Sites like ebaybusiness.com offer an ever-changing selection, as do the Agriculture Online[TM] classifieds at agriculture.com/classifieds. Agriculture Online[TM] classifieds are free for registered users of the site.