Pilot Pumps and Charge Pumps for Excavator Hydraulic Systems

In excavators, pilot pumps and charge pumps play a critical role in maintaining precise control and stable hydraulic performance. They directly influence machine power, response accuracy, and the service life of the main hydraulic pump.

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Pilot Pump

The pilot pump supplies control pressure required to move the spools inside the main control valve. This pressure shifts oil flow paths and enables smooth and precise operation of the boom, arm, bucket, and swing functions. Proper pilot pressure ensures fast response and accurate machine control.

Charge Pump

The charge pump supplies make-up oil to the main pump and prevents cavitation. In variable displacement pumps, it also feeds and activates the servo piston system, allowing the swash plate angle to adjust and precisely control pump output flow. Insufficient charge pressure can lead to power loss, flow instability, overheating, and premature pump damage. We stock a wide range of pilot pumps and charge pumps compatible with Rexroth, Kawasaki, and Sauer Danfoss hydraulic pumps, as well as excavators from major brands such as Hitachi, Komatsu, and others.

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frequently ask questions

Low pilot pressure can prevent the spools inside the main control valve from shifting properly, resulting in delayed or slow machine response.

Insufficient charge pressure can disrupt the servo piston system in variable displacement pumps, causing unstable flow and reduced output power.

Yes. Inadequate charge pressure may lead to cavitation, abnormal noise, and premature internal wear of the main hydraulic pump.

Malfunctioning pilot or charge pumps can reduce system efficiency, create internal leakage, and increase overall operating temperature.

Contaminated oil, incorrect hydraulic fluid, clogged filters, excessive pressure, and poor maintenance are the most common causes of failure.

Regular oil and filter changes, proper pressure monitoring, temperature control, and using high-quality components significantly extend the service life of these pumps.

East Diamond strives to provide high quality hydraulic pumps, parts and motors to mining, construction and agricultural industries. We will constantly challenge ourselves to explore new grounds with innovation and drive.