Used Caterpillar Main Hydraulic Pump: Tested Stock at Codimatra

CAT Models Available in Permanent Stock

Codimatra’s inventory is packed with hydraulic components to meet the immediate needs of professionals. Whether managing a fleet of excavators or bulldozers, our stock enables swift responses to downtime caused by breakdowns. Every Caterpillar hydraulic pump we stock undergoes a thorough diagnostic to validate its performance before listing it on our marketplace.

Pumps for Caterpillar Excavators 312 to 374

Caterpillar hydraulic excavators, from the 312 series to the massive 374, require axial piston pumps capable of handling extreme pressures. A faulty main Caterpillar hydraulic pump on an excavator results immediately in sluggish arm movements or an inability to lift heavy loads. We stock specific references for the 320C, 330DL ranges, and Next Gen models, ensuring perfect compatibility with your original hydraulic circuit.

Pumps for CAT Loaders and Bulldozers

Wheel loaders and bulldozers use their hydraulic systems differently. Besides the main pump, these machines often rely on a steering hydraulic pump or a travel hydraulic pump for precise maneuvering. Our inventory includes solutions for flagship models such as CAT 950H and 963C, allowing you to restore pushing power and the responsiveness of the power-assisted hydraulic steering.

How to Identify the Right Pump for Your Machine?

Selecting a replacement part leaves no room for guesswork. A Caterpillar hydraulic system is complex and often includes several pumping stages. It is crucial not to confuse the main Caterpillar hydraulic pump with a secondary one, as their flow rates and operating pressures differ entirely.

Manufacturer Reference and Serial Number

To ensure your machine functions properly, checking the nameplate is the first step. The machine’s serial number and the reference engraved on the pump housing (often codes like 10R-XXXX or specific Caterpillar serial numbers) are essential. These details allow our experts to confirm that the stocked part exactly matches your excavator’s or loader’s original assembly.

Compatibility by Machine Type

Even if two pumps look identical, their internal power regulation settings can differ from one model to another. A pump intended for a tracked excavator will have different flow curves than one installed on a material handling machine. Our technical advisors use manufacturer databases to verify parts compatibility, helping you avoid costly assembly errors.

How to Tell if a Hydraulic Pump Has Failed?

Detecting a failed hydraulic pump requires careful observation of machine symptoms. The most common sign is a loss of power that worsens with temperature: the pump works well when cold, but as the oil heats up and becomes thinner, functions slow down and the combustion engine may even stall when operating a cylinder. This usually indicates internal leaks caused by wear on the pump body or pistons.

According to common technical data, high-pitched squealing noises, abnormal metallic sounds, or excessive vibrations are all warnings of imminent mechanical failure. Oil contamination by metal particles is often the root cause, wearing away friction surfaces. For a definitive diagnosis, flow rate must be measured at the pump outlet under pressure: if the flow significantly drops between zero and maximum pressure (for example, efficiency falls to 50%), the pump is considered worn out or dead.