A substantial share of hydraulic-system failures is linked to oil contamination and ageing. With systematic hydraulic oil purification, fluid service life can be extended from months to years; at some customer sites, the same oil has remained in service for more than 10 or even 20 years.
FRIESS hydraulic oil purification service is not a conventional emergency repair service. Its purpose is not to repair equipment after damage has occurred, but to reduce the probability of hydraulic-system failures through continuous fluid care.
In many hydraulic systems, costly downtime, faults and repairs are not caused by a single component. They develop as insufficient oil cleanliness, fluid ageing, fine contamination and deposits accumulate over time. Even when conventional filtration is installed, microparticles, resin and oxidation products can still form deposits inside the system and impair valves, pumps and precision hydraulic components.
The FRIESS approach is to maintain fluid quality for the long term through deep filtration, electrostatic oil cleaning and, where necessary, vacuum dehydration—instead of repeatedly replacing expensive hydraulic oil.
In heavily loaded hydraulic systems, EFR electrostatic oil cleaning can extend hydraulic-oil service intervals from months to years while substantially reducing failures, wear and deposits caused by fluid ageing.
During long-term operation, hydraulic oil gradually ages and produces fine particles, oxidation products, resins and sludge that mechanical filters struggle to capture. FRIESS EFR electrostatic cleaning reduces the accumulation of these submicron contaminants and ageing products so the oil remains clear and stable.
Where deposits have already formed, the renewed contaminant-absorption capacity of deeply cleaned oil can gradually redissolve them. In effect, the purified oil continues cleaning the hydraulic circuit from the inside.
Many applications show that oil cleaned with an EFR system can achieve a cleanliness level better than that of new oil, while its required lubrication, protection and power-transmission properties remain stable for longer.
For a hydraulic system, the truly expensive items are rarely one filter element or one oil analysis. They are unplanned downtime, repeated repairs, sticking valves, pump and valve wear, declining machine accuracy and the resulting increase in rejects.
FRIESS electrostatic hydraulic oil cleaners reduce the oil’s varnish-forming potential and prevent ageing products from depositing in the system. This lowers the consumption of expensive hydraulic oil while reducing operating costs and environmental impact.
FRIESS electrostatic hydraulic oil cleaners remove ultrafine particles and oil-ageing products, reducing deposits and the system damage they cause. For operators, this typically means:
FRIESS has more than 50 years of experience developing and manufacturing process-fluid cleaning systems. Rental and service options make it easier to start deep hydraulic-oil purification and systematic fluid care with a lower initial investment.
These options suit companies seeking lower operating costs, less downtime risk and more sustainable hydraulic-system operation. Where oil ageing, varnish deposits, high filter consumption, abnormal valve behaviour or frequent oil changes already occur, oil analysis can be used first to assess the fluid and define the appropriate cleaning and maintenance plan.
For deep hydraulic-oil purification, removing fine particles, resins, oxidation products and other signs of oil ageing. EFR provides stable cleaning performance even in demanding applications where conventional filtration cannot achieve sufficient cleanliness.
Vacuum dehydration removes free and emulsified water. Compared with mechanical methods, it can also help remove dissolved gases and some particles, making it suitable for hydraulic and lubricating oils with significant water contamination.
FRIESS electrostatic hydraulic oil cleaning has been successfully applied at many customer sites and often demonstrates its economic value within a short period. An initial rental or trial service allows operators to verify equipment performance and fluid-care results with lower risk.
Oil analysis identifies contamination, ageing, wear trends and water content, providing a sound basis for cleaning, dehydration and oil-change decisions.
We provide combined solutions ranging from oil analysis to EFR deep filtration, vacuum dehydration and continuous maintenance. Service plans can be adapted to system volume, contamination type and operating conditions, while rental and service models reduce the initial investment.
Applications include injection moulding machines, aluminium-industry presses, steel production lines, wood processing and gearbox manufacturing. The objective is to reduce unplanned downtime, oil changes and repair costs while extending equipment and fluid service life.
