Hydraulic Systems
Hydraulic Fluid Plays Critical Role in Lubricating Internal Pump and Valve Components, Dissipating Heat, and Protecting Entire Hydraulic Circuit from Wear, Corrosion, and Contamination
Hydraulic oil requirements vary considerably based on system pressure, pump type, operating temperature, environmental regulations, and the precision of the control valves and actuators in the circuit. Industrial hydraulic power units, mobile hydraulic systems, marine deck machinery, and offshore platform equipment each demand specific fluid properties. Therefore, it is imperative that you use a high-quality hydraulic oil matched to the system design, pump manufacturer requirements, and operating environment. Also, be sure to select the proper ISO viscosity grade per the OEM specification.
We can help with this by recommending lubrication reliability best practices, including the right hydraulic fluid, for most system configurations. Royal Purple Industrial formulates lubricants using four exclusive additive technologies: Synerlec®, Synslide™, DynaGlyde™ and Purolec™. From factory floor injection molding presses to offshore vessel thrusters, we have years of documented success helping our customers improve system efficiency while extending component life and reducing fluid replacement costs.
Qualities of High-Performance Hydraulic Fluid
- Exceptional film strength and anti-wear protection to guard vane tips, piston shoes, valve spools, and other tight-tolerance hydraulic components
- Outstanding oxidation stability for long fluid life, resisting the thermal stress of continuous circulation through pumps, valves, and actuators
- Rapid air release to prevent cavitation, spongy response, and micro-dieseling that damages pump internals and degrades fluid at an accelerated rate
- Minimum internal leakage characteristics to maintain volumetric efficiency, precise actuator control, and consistent system response
- Environmental compliance options for marine and offshore applications where biodegradability and aquatic toxicity standards must be met
- High viscosity index to maintain consistent fluid film across the full range of system temperatures, from cold startups to sustained high-pressure operation
- Superior rust and corrosion inhibition to protect cylinders, valve bodies, reservoirs, and piping from internal surface degradation
- Excellent demulsibility to rapidly separate water from the fluid, preventing emulsion formation that accelerates wear and promotes microbial growth
- Seal compatibility to protect elastomeric seals, O-rings, and hose linings from degradation, preventing external leaks and system contamination
Reliability Solutions
After selecting your hydraulic fluid, the next step is to build a contamination control strategy around the system. Fluid cleanliness is the single most important factor in hydraulic system reliability. Begin with target cleanliness codes based on the most sensitive component in the circuit (typically servo or proportional valves). Add kidney-loop filtration to maintain those targets continuously. Implement routine fluid analysis to monitor particle counts, water content, viscosity trends, and oxidation indicators. With these practices in place, you can dramatically extend the life of the fluid, the pump, and every downstream component in the system.
Identify Suffering Points
Move Forward with Our Proven Solutions
Problem
The hydraulic pump is the heart of every system, and its condition directly determines performance and reliability. Under sustained high pressures, thin oil films between vane tips, piston shoes, and valve plates are all that prevent metal-to-metal contact. As the fluid degrades or loses viscosity, internal leakage increases, volumetric efficiency drops, and the system generates excess heat. Erratic actuator movement, slower cycle times, and rising energy consumption are early indicators of declining pump health. Conventional hydraulic fluids frequently lack the film strength and thermal stability needed for today’s high-pressure, tight-tolerance systems, leading to accelerated pump wear and costly unplanned replacements.
Solution
Syndraulic® is a clean, long-life, energy-efficient, high-performance semi-synthetic hydraulic oil formulated to help reduce leakage and provide exceptional film strength and wear protection. It is designed to extend the service life of the oil and help protect seals, filters and pumps in hydraulic systems. Syndraulic® is formulated with proprietary Synerlec® additive technology, which forms a tough, slippery film that bonds ionically to metal surfaces, increasing oil film thickness beyond what viscosity alone can provide. For startup protection on rebuilt or newly commissioned hydraulic pumps, Max-Tuff™ provides a tenacious assembly lubricant that safeguards precision internal surfaces during the critical break-in period before the hydraulic fluid reaches full operating pressure and temperature.
Problem
Hydraulic systems circulate fluid continuously through high-temperature, high-pressure zones where oxidation byproducts accumulate over time. These byproducts form a sticky varnish that coats valve spools, restricts orifices, and causes servo valves to stick or respond sluggishly. Sludge settles in reservoirs, clogs filters prematurely, and restricts suction strainers. Water ingress from condensation, cooler leaks, or washdown creates emulsions that promote microbial growth, increase wear, and accelerate corrosion inside cylinders and valve bodies. Particle contamination from wear metals, seal fragments, and environmental ingress further degrades fluid quality and damages tight-tolerance components. Together, these contaminants are responsible for the majority of hydraulic system failures.
Solution
When varnish, sludge, or deposits have accumulated from previous fluids, Clean & Flush™ provides a safe, effective, and economical solution. It can be added to the existing hydraulic oil charge to dissolve and suspend deposits before draining, or used as a temporary system fill to clean reservoirs, lines, and valve bodies before introducing a premium synthetic fluid. This avoids costly system teardowns and extended downtime. Once the system is clean, Syndraulic® inhibits future varnish and carbon buildup thanks to its exceptional oxidation stability and residue-free chemistry. Its rapid water separation keeps the fluid free of emulsions, and its filterability allows for continuous contamination control without depleting the additive package over its extended service life.
Problem
Hydraulic systems aboard vessels and on offshore platforms operate in one of the most demanding regulatory environments in industry. Vessel General Permit (VGP) requirements, EPA aquatic toxicity standards, and US Fish and Wildlife Department regulations mandate the use of environmentally acceptable lubricants (EALs) in oil-to-sea interfaces. Deck cranes, anchor windlasses, controllable pitch propellers (CPP), and vessel thrusters are all subject to these requirements. Beyond compliance, marine hydraulic systems face constant saltwater exposure, wide temperature swings, and the logistical challenges of performing fluid changes at sea. Using a conventional hydraulic oil in these applications risks both environmental penalties and accelerated corrosion from the harsh marine atmosphere. Idle or laid-up vessels face additional risk from internal corrosion during extended shutdown periods.
Solution
Marine Hydraulic Oil is a high-performance, inherently biodegradable, environmentally responsible, and ashless formulation that protects both equipment and the environment. It meets US Fish and Wildlife Department and EPA toxicity test requirements for marine life, making it suitable for inland waterways and offshore applications including vessel thrusters, controllable pitch propellers, and deck machinery. Its long life and high film strength greatly increase equipment reliability, while its advanced formulation resists carbon and varnish formation and provides superior anti-wear protection in extreme marine service. For vessels and platforms with systems that will be idle or laid up for extended periods, VP Preservative Oil provides long-term rust and corrosion protection for hydraulic cylinders, valve bodies, and reservoir internals, ensuring the system is ready for reliable operation when brought back into service.
Recommended Products for Hydraulic Systems
Improve Your Hydraulic System Reliability
Let our synthetic experts recommend the right fluid and contamination control strategy for your hydraulic systems. Contact us today.