Why The Used Hydraulic Oil Need To Be Filtered By Oil Filtration Machine

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Why the Used Hydraulic Oil Need to be filtered by Oil Filtration Machine

July 1,2026.

Hydraulic oil must be filtered using an Oil Filtration Machine, the main reason is that the hydraulic system is a precise closed loop, and contaminants damage hydraulic system. Studies have shown that 70%-80% of hydraulic system failures are caused by oil contamination.

The Hydraulic Oil Purifier can perform high-precision deep purification, effectively controlling oil contamination levels. In addition, using an oil filter machine to purify new oil during refilling is also very necessary, as it prevents bringing residual contaminants from the system pipeline into the new oil.

Where does contamination come from?

Hydraulic oil contamination mainly comes from three sources:

Internal generation: Metal debris generated from the friction of hydraulic components (such as pumps and valves) during movement, as well as gums, sludge, and other substances formed when the oil oxidizes under high temperature and high pressure.

External intrusion: Dust and sand from the air entering through the tank breather or areas with poor sealing, as well as moisture mixed in due to temperature differences or sealing issues.

Residual contaminants: Impurities not fully removed during the manufacturing, assembly, or maintenance of the equipment.

Contaminants: The “invisible killer'”of hydraulic systems

These seemingly tiny contaminants can cause serious damage to the system:

Accelerate component wear: Hard particles act like abrasives, accelerating the wear of precision components such as pumps and valves, which is the main reason for system performance degradation and shortened lifespan.

Cause valve failure: Contaminant particles can cause hydraulic valves to stick, malfunction, or result in rapid wear of the valve core, directly affecting system precision control.

Damage oil pumps: Oil containing water or particles can cause cavitation in the pump, corrode components, and in severe cases, even burn out the pump.

Accelerate oil deterioration: Water and impurities catalyze the oxidation of hydraulic oil, leading to performance degradation. Acids generated from oxidation can also corrode metal components.

Shorten seal life: Dirty oil accelerates the wear of seals and guiding components, causing system leaks.

Oil filter machines: How to solve the problem?

Unlike the 'coarse filtration' on the equipment that can only intercept large particles, an oil filtration machine achieves 'fine filtration,' effectively solving these issues:

Efficiently remove solid impurities: Hydraulic Oil Filter Machine use high-precision filter elements that can effectively filter out tiny particles, which are the most harmful to the system.

Effectively remove water in the oil: Some oil filtration machine have powerful dehydration functions, removing dissolved and free water, preventing oil emulsification.

Restore oil performance: By removing contaminants, Hydraulic Oil Recycling can restore the lubrication, heat dissipation, and other properties of hydraulic oil, effectively 'regenerating' it.

Bring significant benefits: Ultimately extending equipment life, reducing unexpected downtime, and lowering maintenance costs.

In summary, using an Hydraulic Oil Filtration Machine to recycle hydraulic oil is a proactive and cost-effective maintenance strategy. By removing various contaminants, it effectively protects expensive hydraulic components, ensures stable and reliable system operation, and significantly extends the service life of both the equipment and the oil.

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