Describe each stage of the machine cycle
List the movements the hydraulic circuit must perform and the time spent moving, working under load and holding. Identify which functions operate together. The highest flow demand and highest pressure demand may occur at different times.
Ask the equipment designer for the operating points. Cylinder dimensions or machine output figures can help with this work, but are not a complete pump specification.
Connect flow to the available drive
Record actual pump-shaft speed and whether it varies during operation. Theoretical flow follows displacement and speed, while delivered flow also depends on volumetric efficiency at the operating condition.
Use the workbench for an initial estimate, then check the pump’s speed, pressure, fluid and inlet limits against the available drive.
Add installation and purchasing details
Supply mounting, shaft, rotation, port and space requirements together with the specified fluid and temperature range. For a multi-section assembly, describe each section’s duty and the circuit connections.
Include quantity if known, destination and required inspection records. Mark which values are requirements, estimates or still unknown.
References & further reading
Bosch Rexroth — Hydraulics: compact knowledge ↗Parker — Hydraulic Pump Basics ↗For operating limits and service procedures, use the document for your exact pump and machine.