AN unloader looks at the hose pressure and uses that to push on a spool valve with the spool valve dumping line pressure to the reservoir. when the hose pressure drops, a spring pushes that spool (and the line pressure closed) to block the return to tank. The pressure regulator is usually totally separate. Hose pressure when spraying is controlled by nozzle orifice flow rate. If a nozzle gets worn, the unloader might not operate as designed. They can also be affected by trash or particles in the fluid stream. Many are adjustable to account for inlet and hose/nozzle differences. Jim
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Today's Featured Article - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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