WEAR CHARACTERISTICS OF NON-PETROLEUM AND PETROLEUM HYDRAULIC FLUIDS: D7043
EXPLANATION
This test method is an indicator of the wear characteristics of petroleum and non-petroleum hydraulic fluids operating in a constant volume vane pump. Excessive wear in vane pumps could lead to malfunction of hydraulic systems in critical applications. This test method covers a constant volume vane pump test procedure operated at 1200 r/min and 13.8 MPa.
TEST SUMMARY
An amount of 18.9±0.5 L of a hydraulic fluid is circulated through a rotary vane pump system for 100 h at a pump speed of 1200±60 r/min, and a pump outlet pressure of 13.8±0.3 MPa. Fluid temperature at the pump inlet is 66±3 ° C for all water glycols, emulsions, and other water containing fluids and for petroleum and synthetic fluids of ISO Grade 46 or lighter. A temperature of 80±3 ° C is used for all synthetic and petroleum fluids. The total quantity of test oil required for a run is 26.5 L. The result obtained is the total mass loss from the cam ring and the twelve vanes during the test. Other reported values are initial flow rate and final flow rate.
TEST PRECISION
The precision and bias of this test method is being determined. However, from a preliminary statistical examination of the round robin data collected it appears that the test repeatability is 75 mg.
