This AIR presents the following factors that affect hydraulic pump life and performance:

a. The need to supply hydraulic fluid at the correct pressure and quality to the pump inlet port

b. Considerations for the pump output

c. Factors to be considered for the pump case drain lines

d. The mounting of the hydraulic pump

e. Hydraulic fluid properties, including cleanliness

Field of Application

This document applies to pumps operating constantly or for long periods at quasi-constant speed or within narrow speed ranges, such as engine driven or electric motor driven pumps.

Wide speed range and intermittent duty cycle pumps, such as those used in Electrohydrostatic Actuators, are not covered by this document.