MP Filtri PML2, User Manual

Page: 46 / 64

Appendix E
46 Recommendations
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 Com-
ponent Cleanliness (ISO 4406:1999)
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Most component manufacturers know the proportionate effect that increased dirt
level has on the performance of their components and issue maximum permissi-
ble contamination levels. They state that operating components on fluids which
are cleaner than those stated will increase life. However, the diversity of hydraulic
systems in terms of pressure, duty cycles, environments, lubrication required, con-
taminant types, etc, makes it almost impossible to predict the components service
life over and above that which can be reasonably expected. Furthermore, without
the benefits of significant research material and the existence of standard contami-
nant sensitivity tests, manufacturers who publish recommendations that are cleaner
than competitors may be viewed as having a more sensitive product.
Hence there may be a possible source of conflicting information when comparing
cleanliness levels recommended from different sources.
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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.