Hydraulic cylinder leaks are rarely a seal problem — they're a diagnosis problem.Hydraulic cylinder leaks are rarely a seal problem — they're a diagnosis problem. This article breaks down the three most common root causes of recurring leaks: contaminated fluid, rod surface damage, and incorrect seal specification, and explains how to identify and fix each one before reaching for a new seal kit.

This article mainly introduces the maintenance points of hydraulic power units and related equipment, including: lubricating the motor according to the manufacturer's instructions; cleaning and replacing filters as indicated or in the manual, ensuring the use of the appropriate type and proper cleaning; the suction filter is usually cleaned for the first time after 10 hours of use, and then every 100 hours (the specific time may vary by manufacturer); regularly check the oil level in the reservoir, especially when first used, ideally every 100 hours; replace the hydraulic oil within the 1000-2000 hour usage range according to the manufacturer's requirements and factors such as the usage environment and application; and check if the oil is overheated, as overheated oil is darker in color and may have a burnt smell compared to new oil.

Hydraulic power units (HPUs) are widely used in industrial manufacturing, construction machinery, aerospace, ships, and agricultural equipment, providing efficient power support for various heavy machinery. In the manufacturing industry, HPUs drive presses and automated production lines, significantly enhancing production efficiency, but they face the problem of high energy consumption. In the construction sector, excavators and cranes rely on hydraulic systems to complete high-intensity operations, with their load adaptability being outstanding, but the maintenance costs are relatively high. In aerospace and ship applications, the reliability and precise control of HPUs are extremely demanding, and custom solutions are usually required. In agricultural machinery, hydraulic systems are used to complete farming and harvesting operations, with their durability being suitable for harsh environments, but the energy efficiency differences can affect operating costs.