SKILL BUILDER SERVICE GUIDE FOR QUINTOLUBRIC® 865 SERIES DESCRIPTION OF THE MOST IMPORTANT PROPERTIES OF THE FLUID IN SERVICE AND TOLERANCES Summary Lubricants are the life blood of hydraulic systems. When monitored and maintained regularly, QUINTOLUBRIC® 865 Series fluids can reach a lifetime of up to 35,000 system hours (~4 years, depending on the leakage rate, higher fluid lifetimes can be achieved). The optimal lifetime is achieved when the fluid is kept clean and dry, in combination with proper filtration, air breather control, and running at the lowest possible temperature. The optimum operating temperature range is 40-50°C (95-120°F). Monitoring through in-service oil analysis, an important element of predictive maintenance, can provide information about machine wear, as well as lubricant contamination and condition. By checking the appearance, viscosity, water content, acid number, cleanliness and solid metal and additive contents, the condition of the fluid can be measured. Appearance - Fresh fluid color is yellow to amber, and will evolve to dark amber over time. But a dark color does not mean the product is in a bad condition. A better judgment of the fluid’s condition can be made after checking additional parameters. Viscosity - A lower viscosity usually indicates the presence of contaminants, such as a lower viscosity fluid - mineral oil or phosphate ester. A higher viscosity could indicate the presence of water, a higher viscosity fluid or fluid degradation. Water content - When the fluid is running in a hydraulic system, the maximum recommended water content is 0.20% (2,000 ppm), preferably below 0.10% (1,000 ppm) as water can cause corrosion, sludge formation, filter & valve blockage and increased wear.
Solid metal and additive contents - To determine the level of (abrasive) metals and concentration of additives (e.g. Phosphorous), the fluid can be analyzed with modern analytical techniques showing the amounts of a large number of wear and additive metals. Each element can be compared with its initial value in fresh fluid, which indicates the level and type of contamination and the degradation of the fluid. It is recommended to perform analyses on QUINTOLUBRIC® 865 Series fluids at least 2 times per year.
Temperature It is recommended to keep the temperature of the hydraulic fluid as low as possible. The maximum recommended operating temperatures for the QUINTOLUBRIC® 865 Series fluids are:
• 55°C (131°F) maximum reservoir temperature • 70°C (158°F) maximum system temperature
Data sheets for the QUINTOLUBRIC® 865 Series, are available on quintolubric.com, and include a graph that show product life at various temperatures (considering the fluid is in a clean and dry condition). The higher the temperature, the shorter the lifetime of the fluid, however the performance of the hydraulic fluid will not be jeopardized. At tank temperatures of 40-50°C (104-122°F) (and considering the fluid is in a clean and dry condition) a lifetime of > 35,000 system hours is easily achievable.
Acid number (AN) - This will increase with use, fresh QUINTOLUBRIC® 865 will have an initial AN value of < 2.0 mg KOH/g, and can reach 8.0 mg KOH/g. This is when the fluid in the system should be discarded and replaced with new QUINTOLUBRIC® 865 Series fluid. Cleanliness - To maximize component and fluid life, cleanliness needs to be managed. Hydraulic component OEMs have recommended particle counts for the fluid, so the recommended contamination level in a hydraulic system during operation will depend on the design and hydraulic components used.
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