Hydraulic Component Cleanliness requirements & Fluid Selection guide

Hydraulic Component fluid cleanliness requirements & Fluid type selection guide
The following components should operate in the fluid cleanliness levels indicated or better
Component Type	Operating pressures
	<1500 psi	1500 - 2500 psi	>2500 psi
	ISO 4406 Cleanliness required
Servo Valve	16/14/12	15/13/11	14/12/10
Proportional Valve	17/15/12	16/14/12	15/13/11
Variable Volume Pump	17/16/13	17/15/12	16/14/12
Cartridge Valve	18/16/14	17/16/13	17/15/12
Fixed Piston Pump	18/16/14	17/16/13	17/15/12
Vane Pump	19/17/14	18/16/14	17/16/13
Pressure/Flow control Valve	19/17/14	18/16/14	17/16/13
Solenoid Valve	19/17/14	18/16/14	18/16/14
Gear Pump	19/17/14	18/16/14	18/16/14

Suggested Fluid type	AW	AW - HVI	HVI

Legend
"AW" is standard Anti Wear Hydraulic fluid usually with a Viscosity Index of approx 100 +
"HVI is High Viscosity Index Hydraulic fluid usually with a Viscosity Index of approx 150 +

Please note ‚ the above fluid guide is a general guide under "normal" service conditions and should be read in conjunction with Equipment Manufacturers recommendations ‚ do not confuse the Viscosity Index with the ISO Viscosity rating of a fluid