Denison piston pump serial # 90L10-0387

June 21, 2006 2:59pm CST
Model # scratched off.Pump operating pressure is currently at 800 PSI.In service for 5 years.If pressure is raised to 1000 PSI,pump makes a steady whinning noise.relief valve is 200 PSI higher then pump setting.Fluid is mineral based HYd fluid w/ suction strainer and return filtration.Does this pump need tuned or something else done to it?
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