External Gear Pumps: Reliable, Efficient and Versatile

Hydraulic gear pumps are among the most widely used types of hydraulic pumps, prized for their simplicity, durability, and cost-effectiveness. These positive displacement pumps generate flow by trapping fluid between the teeth of meshing gears and forcing it through the outlet – delivering consistent performance across a wide range of applications.

How Do Hydraulic Gear Pumps Work?

Invented by Johannes Kepler in the 1600s, gear pumps have evolved into a cornerstone of hydraulic systems. Here’s how they operate:

• Two gears rotate inside a tightly sealed housing. As the gears unmesh on the inlet side, they create a vacuum that draws fluid in.
• The fluid is carried between the gear teeth around the pump casing.
• As the gears mesh again on the outlet side, the fluid is compressed and expelled under pressure.

Because gear pumps are fixed displacement, they move a consistent volume of fluid with each revolution – making them ideal for systems requiring predictable flow rates.

Can Hydraulic Gear Pumps Be Reversed?

Yes – most gear pumps are symmetrical and can be reversed by disassembling the unit and flipping the centre section. This flexibility makes them suitable for both pumping and motor functions in certain hydraulic systems.

Are Gear Pumps Noisy?

Some gear pump designs are known for their noise levels. However, modern gear pumps have significantly improved thanks to:

• Helical gear teeth for smoother meshing
• Split gear designs that reduce vibration
• Precision machining for tighter tolerances

These innovations minimise pressure ripple and mechanical noise, resulting in quieter, more efficient operation.

Want to Learn More About Hydraulic Pumps?

If you’re exploring hydraulic systems or comparing different pump types, don’t miss our Hydraulic Pumps Ultimate Guide – covering: the different types of hydraulic pumps, how each pump works, their ideal applications and more.

Whether you’re a seasoned engineer or just getting started, this guide is packed with insights to help you make informed decisions.

Global Supply & Trusted Expertise

We supply a wide range of hydraulic gear pumps from more than 80 leading global brands – including Bosch Rexroth, Parker, Casappa, Argo-Hytos and more. Whether you’re sourcing OEM replacements or custom-built solutions, we offer:

• Worldwide export with fast, reliable shipping
• Award-winning customer service recognised for excellence
• Hydraulics expertise backed by decades of industry experience
• Technical support to help you choose the right component for your system

From small businesses to multinational operations, we’re trusted by customers across industries and continents.

Not Just Internal Gear Pumps 

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Hydraulic Pumps | Hydraulic Valves  | Hydraulic Cylinders | Hydraulic Filters | Custom Hydraulic Power Packs  |  Hydraulic Repair Service … alongside thousands of other Hydraulic Components and Accessories

Our website showcases just a selection of what we supply. For impartial advice and access to thousands more hydraulic components, contact our expert team – wherever you are.