Hydraulic Oil

 

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 recommended for use in circuits 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 Desirable 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 periodically 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 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