Normal pump operation (at rated conditions) is based on the use of SAE 10W oil in the 38_ to 82_ C (100_ to 180_ F) range (or comparable viscosities).
When operating with SAE 10W oil in the 860 to 40 cSt (4000 to 180 SUS) range (-12_ to 35_ C or 10_ to 95_ F oil temp.), the speed and pressure of the pump should be limited to 50% or less of their respective rated value until the system has warmed up. Caution must be used in starting units when fluid viscosity is greater than 860 cSt (4000 SUS). Care should be exercised to warm up the entire system (fluid). Remote components (cylinders, motors) should be actuated during the warm-up process.
Fluid viscosities must not be less than 60 SUS, and temperatures should not exceed 99_ C (210_ F), because the life expectancy of rotating groups and elastomers will decrease.
Care should be taken to change to appropriate oil viscosities when climatic conditions change. See recommendations for mobile hydraulic systems on pages 120 and 121. Consult your Vickers representative for applicable decreases in ratings, and modifications, if fluids other than SAE type oils are considered.
Proper fluid condition is essential for long and satisfactory life of hydraulic components and systems. Hydraulic fluid must have the correct balance of cleanliness, materials, and additives for protection against wear of components, elevated viscosity and inclusion of air.
Essential information on the correct methods for treating hydraulic fluid is included in Vickers publication 561; “Vickers Guide to Systemic Contamination Control,” available from your local Vickers distributor or by contacting Vickers, Incorporated. Recommendations on filtration and the selection of products to control fluid condition are included in this publication.
Recommended cleanliness levels using petroleum oil under common conditions are based on the highest fluid pressure levels in the system. See Figure 1.
Fluids other than petroleum, severe service cycles or temperature extremes are cause for adjustment of these cleanliness codes. See Vickers publication 561 for exact details.
