9
Application Data
Fluid Cleanliness
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 561.
Recommended cleanliness levels, using
petroleum oil under common conditions,
are based on the highest fluid pressure
levels in the system and are coded in
the chart below. 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.
Vickers products, as any components,
will operate with apparent satisfaction in
fluids with higher cleanliness codes than
those described. Other manufacturers
will often recommend levels above
those specified. Experience has shown,
however, that life of any hydraulic
component is shortened in fluids with
higher cleanliness codes than those
listed below. These codes have been
proven to provide a long, trouble-free
service life for the products shown,
regardless of the manufacturer.
System Pressure Level
bar (psi)
Product
<70 ( <1000)
70-207 (1000-3000) 207+ ( 3000+)
Vane Pumps – FIxed 20/18/15 19/17/14 18/16/13
Vane Pumps – Variable 18/16/14 17/15/13
Piston Pumps – Fixed 19/17/15 18/16/14 17/15/13
Piston Pumps – Variable 18/16/14 17/15/13 16/14/12
Directional Valves 20/18/15 20/18/15 19/17/14
Pressure/Flow Control Valves 19/17/14 19/17/14 19/17/14
CMX Valves 18/16/14 18/16/14 17/15/13
Servo Valves 16/14/11 16/14/11 15/13/10
Proportional Valves 17/15/12 17/15/12 15/13/11
Cylinders 20/18/15 20/18/15 20/18/15
Vane Motors 20/18/15 19/17/14 18/16/13
Axial Piston Motors 19/17/14 18/16/13 17/15/12
Radial Piston Motors 20/18/14 19/17/13 18/16/13
Fluids and Seals
Flourocarbon seals are available and
are suitable for use with phosphate
ester type fluids or their blends, water
glycol, water-in-oil emulsion fluids and
petroleum oil.
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