What is the expected level of internal leakage in a new pump?

The expected level of internal leakage in a new hydraulic pump typically falls within the range of 5% to 15%. This leakage occurs due to the inherent design and operational characteristics of hydraulic pumps. Even in new pumps, some degree of internal leakage is normal as the pump components, such as seals and clearances, are not perfectly aligned, allowing fluid to seep past them.

A small amount of internal leakage is generally acceptable as it helps in lubricating moving parts and can contribute to preventing wear. However, manufacturers design their pumps to minimize this leakage as much as possible while maintaining efficiency and performance. As the pump ages and components wear, internal leakage may increase, but in a new pump, it should ideally remain within this specified range.

Understanding this concept is crucial in assessing the performance and reliability of hydraulic systems, as internal leakage can significantly affect the system's overall efficiency and effectiveness.