What are the general issues causing hydraulic pressure loss?

1 Answers
SebastianDella
07/30/25 1:39am
Here are the reasons why a hydraulic cylinder fails to maintain pressure: 1. Hydraulic lock failure: A hydraulic lock, also known as a double pilot-operated check valve, consists of two pilot-operated check valves arranged in the same valve body. It maintains pressure when the hydraulic cylinder is not supplied with oil. Damage to the hydraulic lock may cause the hydraulic cylinder to lose pressure. The cause of hydraulic lock damage is often contamination leading to failure. 2. Seal failure: If oil leakage is found at the hydraulic pump joint, it may be due to seal leakage. Seals are the primary components preventing hydraulic cylinder leakage. They include YX-type, U-type, V-type, O-ring, Glyd ring, Step seal, and combined seals, which mainly rely on compression for sealing. Once the seal is misaligned or aged, resulting in poor sealing, the hydraulic cylinder will fail to maintain pressure.
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