Fluid breakdown and pump wear were investigated in a pump loop at 275℉ and 3000 psi on five petroleum based hydraulic fluids.nThe mechanical shearing of these fluids resulted in excessive loss of viscosity, although their resistance to oxidation was not appreciably changed. The vide variations in the wear data of these fluids indicated their difference in lubrication characteristics in the particular system employed. Bench wear data did not correlate with the pump wear results.
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