Hydraulic pumps and motors

Maintenance related articles:
Hydraulic equipment maintenance - why it's so important
Anatomy of a hydraulic pump failure
Determining hydraulic pump condition using volumetric efficiency
Hydraulic pump life cut short by particle contamination
Hydraulic pump repair using aftermarket hydraulic parts
Hydraulic motors - how dry starts damage them
Hydraulic pump control problem highlights the value of testing
Hydrostatic transmissions - making sense of case drain flow - Part 1
Hydrostatic transmissions - making sense of case drain flow - Part 2
Hydrostatic transmissions - making sense of case drain flow - Part 3
Temperature shock of hydraulic components and how to avoid it
Reducing hydraulic system noise
Hydraulic pump and motor case drains - filter with caution
Understanding hydraulic load sensing control
The anatomy of hydraulic vane pump failure
Understanding hydrostatic balance
Power saving with hydraulic load sensing control
How to source aftermarket hydraulic parts
Is this problem destroying your hydrostatic transmission?
A serious consequence of over-pressurizing your hydraulic system
A strange hydraulics problem - but true!

Application guidelines and formulas:
Useful power in a hydraulic system is a product of flow and pressure, minus inefficiencies. When selecting a hydraulic pump and/or motor for a specific application the relationships between flow, displacement, speed, torque and pressure, and the influence of inefficiencies must be considered. The following guidelines and calculations can be applied to all rotary drives.

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