01 What it is

GP-40 Demo

External gear pump

Two gears turn inside a tight casing and move fluid from the inlet to the outlet. Every part you see is drawn by code, not loaded from a model file.

Drag the pump to turn it. Use the slider to take it apart.

02 How fluid moves

Fluid rides the tooth gaps.

Fluid enters at the inlet and fills the gaps between the teeth as they come apart. The gears carry it round the outside wall. Where the teeth mesh, they squeeze it out of the outlet.

Flow starts paused because your device asks for reduced motion. Press Play to run it.

03 What is inside

Twelve named parts.

The slider slides each part along its own axis, in the order it comes off: bolts, covers, bearings, gears. Tap a number in the picture, or a name here, to see what that part does.

The pump comes apart along its shaft: bolts, covers, bearings, gears. The parts table under Spec lists every part in your build.

04 What wears first

Seal, bearings and O-rings.

These are marked in red. They rub, roll or squash every hour the pump runs, so they are the usual first replacements on a gear pump.

The gear faces and the bore wall wear too, mostly when the fluid carries grit.