Cast iron gear pump buyers: when an aluminum fixed-displacement pump fits

Start with the material decision

A cast iron gear pump suits a specification that requires cast iron construction. The Parker PGP500 series is an aluminum, bushing-block gear pump, so it belongs on a different purchasing path. We recommend this range when your hydraulic system can use aluminum construction and your priority is a fixed-displacement pump for agriculture, turf, material handling or industrial equipment.

This distinction should be settled before comparing pressure or speed. If the machine design requires cast iron, send that material requirement with the inquiry. If aluminum construction is acceptable, continue by matching the operating envelope below.

Match displacement to the hydraulic circuit

The range includes 3, 6, 10, 15, 20 and 25 cm³/rev displacement options. Displacement is the first integration check because it affects the flow produced at a given shaft speed. Choose the available size that corresponds to the circuit's required flow and drive speed, then check the pressure and speed limits for that size.

The 3, 6 and 10 cm³/rev options have a continuous pressure rating of 230 bar and an intermittent pressure rating of 280 bar. The 15, 20 and 25 cm³/rev options have a continuous rating of 210 bar and an intermittent rating of 250 bar. This split matters when a machine needs a larger displacement but also operates near its pressure limit.

For a compact agricultural or turf machine, picture the pump working through its normal duty cycle rather than only at peak demand. Identify the required flow, calculate the corresponding shaft speed, and compare the result with the selected displacement's pressure range. That check gives you a sounder choice than selecting a model from the series name alone.

Check the drive speed and pressure window

Every listed displacement has a minimum speed of 600 rpm and a maximum speed of 3,000 rpm. The drive, coupling and hydraulic circuit therefore need to keep the pump within this common speed window during operation.

Pressure selection is size-dependent. A buyer specifying 15, 20 or 25 cm³/rev should use the 210 bar continuous and 250 bar intermittent ratings in the equipment design. A buyer specifying 3, 6 or 10 cm³/rev can use the 230 bar continuous and 280 bar intermittent ratings. Continuous and intermittent conditions should be separated in your duty calculation so the pump is matched to how the machine actually runs.

Before requesting a quotation, prepare the required displacement, normal operating pressure, peak intermittent pressure and shaft-speed range. We can then align the requested PGP500-series configuration with the working conditions you provide.

Choose the section layout for the machine

The PGP500 series is available as a single, tandem or multiple pump, with single or multi-section varieties. A single pump is the direct choice for a circuit that needs one pumping section. Tandem or multiple arrangements suit equipment whose hydraulic design requires more than one pump section in one assembly.

This choice affects integration space, shaft arrangement and the way the machine's hydraulic functions are supplied. Confirm the number of sections required by the circuit before selecting the series. For agricultural machinery with several hydraulic functions, include the circuit layout and the required flow for each section in the inquiry instead of requesting a series name alone.

The product description identifies material handling, agriculture, turf and industrial applications as target markets. Use the same application information when discussing the pump, along with the installation space and drive details. Those inputs help separate a basic single-section requirement from a tandem or multiple-section configuration.

Questions to settle before ordering

Send the material requirement with the duty data

Choose a cast iron gear pump when cast iron is a fixed construction requirement. Choose the Parker PGP500-series aluminum pump when aluminum construction is acceptable and the application matches its fixed displacement, speed and pressure ranges. For a quotation, send the required material, displacement, continuous and intermittent pressures, shaft speed, number of sections, application and installation space.