10 | Plant & Works Engineering www.pwemag.co.uk April/May 2026 Insight Hydraulic systems have a habit of revealing their problems gradually. Long before a pump fails or a valve begins to respond sluggishly, the warning signs are often already circulating within the oil itself. A rise in particle levels, traces of water, subtle changes in viscosity or increasing oxidation can all signal that wear or contamination is developing somewhere inside the circuit. For engineers responsible for keeping plant running, lubrication is therefore more than a routine maintenance consideration; Reducing downtime by managing hydraulic lubrication and contamination Hydraulic oil does far more than transmit power, its condition reflects the health of the entire system, influencing efficiency, component life and reliability. As hydraulic equipment across UK industry operates under higher pressures and stricter environmental expectations, careful management of lubrication and fluid cleanliness has become essential to maintaining performance and preventing costly failures. PWE reports. it is a direct indicator of system health. As system pressures and power densities have increased over the past two decades, the tolerance for poor lubrication practices has decreased. Components such as piston pumps and proportional valves are manufactured with extremely fine internal clearances and depend on clean, stable hydraulic oil to function correctly. Hydraulic oil performs several roles simultaneously. It transmits power throughout the system, lubricates moving surfaces, removes heat generated during operation and protects internal metal components against corrosion. A failure in any one of these functions affects the others. When oil becomes contaminated or chemically degraded, friction increases, temperatures rise and wear accelerates inside pumps, motors and valves. Solid particle contamination remains the most common cause of hydraulic wear. Dirt introduced during maintenance, airborne dust entering through reservoir breathers or wear debris generated inside the system can all
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