Causes for Hydraulic Fluid Contamination

External Particulate Contamination: The contamination of hydraulic fluid can be primarily caused by external particulate matter. Through breather caps, seals, or damaged reservoirs, dust, dirt, and debris can infiltrate the hydraulic system.
Water Ingress: The use of contaminated hydraulic fluids or improper storage of hydraulic fluid containers can introduce water into the system. Inadequate maintenance procedures can also lead to water ingress.
Airborne Contaminants: In environments with high levels of dust, moisture, or chemical vapors, there is a greater risk of airborne contamination especially in mining, construction industry faces this issue often.
Improper Maintenance Practices: Neglecting to properly filter or clean the oil during refilling or routine maintenance can result in the deterioration of hydraulic fluid quality.
Seal and Hose Deterioration: Contamination can potentially arise due to the breakdown of seals and hoses in the hydraulic system.
Fluid Degradation: The formation of sludge, varnish, and other by-products during the degradation of fluid contributes to contamination.