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John Deere has also increased filter performance on new equipment because of concerns about fuel contaminants. While investigating fuel injector problems, field service representative Greg Clampitt, from Deere''s Waterloo, Iowa, Engine Works, discovered good reason for that concern.Clampitt used fuel testing equipment on tractors operating in several states. The equipment counted particles as small as 2 microns both before and after the fuel filtration system (see chart below).Surprising results"The results were surprising, and we think they relate to fuel storage and handling," says Clampitt. "We tested tractors in Texas and, on average, found 25 times more particles in the 2-to 5-micron size range than on tractors tested in Iowa. There were 40 times more particles from 5 to 15 microns in size in Texas. Results from tests on tractors in Arizona and California fell between the Texas and Iowa findings. (disable :above)))(define-rap (processing-start ?stage ?adjust-time)...(method purge(context (and (= ?stage purge)(valve-position roskm pps_select ?old-pos?error)(= ?old-pos pps)(nominal-pump-speed roskm feed ?wwsp)(default-timeout ?dto)))(task-net(sequence(t1 (syringe-pump-p roskm start feed ?wwsp 30)(t2 (water-flowing-p roskm stop recirc 0 ?dto)(t3 (turn-valve-p roskm pps_select reject ?dto)(t4 (turn-valve-p roskm process purge ?dto))(t5 (turn-valve-p roskm pps_select tank ?dto))))Figure 7. A Primitive Event, a Primitive Reaction Action Package [FIGURE 1-2 OMITTED]When the magnetic bearings are energized, the motor and impellers, which are keyed directly to the magnetic shaft, levitate. Permanent-magnetic bearings do the primary work, while digitally controlled electromagnets provide the fine positioning. Four positioning signals per bearing hold the levitated assembly to a tolerance of 0.00002 in. As the levitated assembly moves from the center point, the electromagnets'' intensity is adjusted to correct the position. These adjustments occur 6 million times a minute. The software has been designed to automatically compensate for any out-of-balance condition in the levitated assembly.SHUTDOWNS AND POWER FAILURESWhen the compressor is not running, the shaft assembly rests on graphite-lined, radially located touchdown bearings. The magnetic bearings normally position the rotor in the proper location, preventing contact between the rotor and other metallic surfaces. If the magnetic bearings fail, the touchdown bearings (also known as backup bearings) are used to prevent a compressor failure. ©2003 www.utility-truck.net All rights reserved. |
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