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Fluid Power Formulas | Oil Recommendations |
| Cylinders | Pumps | Valves | Glossary of Terms |

Hydraulic Info:     0il Recommendations


All parts, with the exception of a few items, are lubricated by the hydraulic oil in the circuit. Particular attention must be paid to keep the oil in the circuit clean. Whenever there is a hydraulic component failure (cylinder, pump, valve), and there is a reason to feel that metal particles may be in the system, the oil must be drained, the entire system flushed clean, and any filter screens thoroughly cleaned or replaced. New oil should be supplied for the entire system. Oil suitable and rec- ommended for use in circuiits involving pumps, motors and cylinders should meet the following specifications:

Viscosity Index:
Aniline Point:
Recommended Additives:

Filtration:
90 minimum
175 maximum
Foam depressant, rust and oxidation inhibitors.
10 micron recommended for maximum pump life.

Normal
Temperatures:
Minimum Maximum
Ambient:
System:
0° F (-18° C.)
100° F. (37.8° C.)
100dfs° F.   (37.8° C.)
180° F. (82.2° C.)

Other Desireable Characteristics:

  • Stability of physical and chemical characteristics.
  • High demulsibility (low emulsibility) for separation of water, air and contaminants.
  • Resistant to the formation of gums, sludges, acids, tars and varnishes.
  • High lubricity and film strength.

General Recommendations:

  • A good quality hydraulic oil conforming to the characteristics listed above is essential to the satisfactory performance and long life of any hydraulic system.
  • Oil should be changed Qn regular schedules in accordance with the manufacturers recommendations and the system peri- odically flushed.
  • Oil operating temperature should not exceed 200° F. (93° C.) with a maximum of 180° F. (82° C.) generally
  • recommended. 120° F to 140° F. (50° C. to 60° C.) is generally considered the optimum system operating temperatures. High temperatures result in rapid oil deterioration and may point out a need for an oil cooler or a larger reservoir. The nearer to optimum temperature, the longer the service life of the oil and the hydraulic components.
  • The system reservoir capacity should equal, in gallons, the pump output in gpm or the total gpm of all pumps where there is more than one in the system.
  • Oil poured into the reservoir should pass through a 100 mesh screen. Pour only clean oil from clean containers into the reservoir.



PHYSICAL PROPERTIES
TEST REQUIREMENT METHOD
Viscosity @ 100 deg. F. 150 SSU Minimum D88
Viscosity @ 210 deg. F. 42 SSU Minimum D88
Viscosity index 95-125 D2270
Gravity, API 28.9-31.0 D287
Zinc .08% Minimum By Weight
Corrosion at 212 deg. F. Maximum 1 D130
Emulsion at 130 deg. F. 30 D1401
Flash point deg. F. Minimum 380 D92
Foam Test:    
Tendency @ 75 deg. F., M1 , Maximum 75 D892-IP146
Stability @ 75 deg. F., M1, Maximum    
Pour Point deg. F., Minimum* -20 D97
Rust Test -Pass D665
Minimum Hours to reach Acid No.2 2,000 D943



 
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