Appendix E
Recommendations
49
Recommendations
Unit
Type
ISO 4406:1999 Code
PUMP
Piston (slow speed, in-line)
22/20/16
Piston (high speed, variable)
17/15/13
Gear
19/17/15
Vane
18/16/14
MOTOR
Axial piston
18/16/13
Radial piston
19/17/13
Gear
20/18/15
Vane
19/17/14
VALVE
Directional (solenoid)
20/18/15
Pressure control (modulating) 19/17/14
Flow control
19/17/14
Check valve
20/18/15
Cartridge valve
20/18/15
Proportional
18/16/13
Servo-valve
16/14/11
ACTUATOR
20/18/15
Table I
Typical Manufacturers Recommendations for Component Clean-
liness (ISO 4406:1999)
IX
Most component manufacturers know the proportionate effect that increased
dirt level has on the performance of their components and issue maximum
permissible contamination levels. They state that operating components on
IX
It should be noted that the recommendations made in this table should be viewed as starting
levels and may have to be modified in light of operational experiences or user requirements.
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