|| 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:
Foam depressant, rust and oxidation inhibitors.
10 micron recommended for maximum pump life.
|0° F (-18° C.)
100° F. (37.8° C.)
|100dfs° F. (37.8° C.)
180° F. (82.2° C.)
- 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
- High lubricity and film strength.
- 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
- 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.
@ 100 deg. F.
|Viscosity @ 210 deg. F.
||42 SSU Minimum
|Corrosion at 212 deg. F. Maximum
|Emulsion at 130 deg. F.
|Flash point deg. F. Minimum
|Tendency @ 75 deg. F., M1 , Maximum
|Stability @ 75 deg. F., M1, Maximum
|Pour Point deg. F., Minimum*
|Minimum Hours to reach Acid No.2