What symptom indicates that a hydraulic pump has lost efficiency?

A hydraulic pump losing efficiency often manifests through a combination of symptoms. Slow-moving actuators indicate that the pump is not delivering sufficient hydraulic fluid to maintain the expected speed and force of operation. This can point to problems such as wear over time or internal leakage within the pump, leading to decreased performance.

Excessive oil flow through the drain line while being tested signifies that hydraulic fluid is bypassing the pressure part of the system, which is another key indicator of inefficiency. This condition suggests that the pump is not maintaining adequate pressure, as fluid is escaping rather than being utilized effectively within the hydraulic circuit.

Both of these symptoms—slow-moving actuators and excessive oil flow through the drain line—are crucial in diagnosing a hydraulic pump's loss of efficiency. Recognizing both signs together provides a more comprehensive understanding of the issue, as they can occur simultaneously due to similar causes related to pump wear, internal leakage, or malfunctioning components. Therefore, acknowledging both symptoms offers a clearer picture of the potential efficiency loss in a hydraulic system.