Target Cleanliness Levels
| Recommended Cleanliness Code Chart |
| PUMPS |
| Pressure |
<140 Bar |
<210 Bar |
>210 Bar |
| Fixed Gear |
20/18/15 |
19/17/15 |
18/16/13 |
| Fixed Vane |
20/18/15 |
19/17/14 |
18/16/13 |
| Fixed Piston |
19/17/15 |
18/16/14 |
17/15/13 |
| Variable Vane |
19/17/15 |
18/16/14 |
17/15/13 |
| Variable Piston |
18/16/14 |
17/15/13 |
16/14/12 |
| VALVES |
| Pressure |
<210 Bar |
>210 Bar |
| Directional (solenoid) |
20/18/15 |
19/17/14 |
Pressure (modulating)
|
19/17/14 |
19/17/14 |
Flow Controls (standard)
|
19/17/14 |
19/17/14 |
Check Valves
|
20/18/15 |
20/18/15 |
Cartridge Valves
|
20/18/15 |
19/17/14 |
Screw-in Valves
|
18/16/13 |
17/15/12 |
Prefill Valves
|
20/18/15 |
19/17/14 |
Load-sensing Directional Valves
|
18/16/14 |
17/15/13 |
Hydraulic Remote Controls
|
18/16/13 |
17/15/12 |
Proportional Directional (throttle)
|
18/16/13 |
17/15/12* |
Proportional Pressure Controls
|
18/16/13 |
17/15/12* |
Proportional Cartridge Valves
|
18/16/13 |
17/15/12* |
Proportional Screw-in Valves
|
18/16/13 |
17/15/12 |
| Servo Valves |
16/14/11 |
15/13/10* |
| ACTUATORS |
| Pressure |
<140 BAR |
<210 BAR |
>210 BAR |
| 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 |
| Gear Motors |
21/19/17 |
20/18/15 |
19/17/14 |
| Radial Piston Motors |
20/18/14 |
19/17/15 |
18/16/13 |
| Swashplate Design Motors |
18/16/14 |
17/15/13 |
16/14/12 |
| HYDROSTATIC TRANSMISSIONS |
| Pressure |
<140 Bar |
<210 Bar |
>210 Bar |
| Hydrostatic Transmissions |
17/15/13 |
16/14/12* |
16/14/11* |
(in-loop fluid)
|
| BEARINGS |
| Ball Bearing Systems |
15/13/11* |
| Roller Bearing Systems |
16/14/12* |
| Journal Bearings (high speed) |
17/15/13 >400 RPM |
| Journal Bearings (low speed) |
18/16/14 >400 RPM |
General Industrial Gearboxes
|
17/15/13
|
*Requires precise sampling practices to verify cleanliness levels.
|
|
| How to Set a Target Cleanliness Level |
STEP ONE
Using the Recommended Cleanliness Code Chart, determine the cleanest fluid (lowest code) required by any component in the system. All components that draw fluid from a common reservoir should be considered to be part of the same system even if their operations are independent or sequential (i.e a central power unit running several different machines). The pressure rating for the system is the maximum system pressure achieved by the machines during a complete cycle of operation.
STEP TWO
For any system where the fluid is not 100% petroleum oil, set the target one Range Code cleaner for each particle size.
Example: If the cleanest code required was 17/15/13 and water glycol is the system fluid, the target becomes 16/14/12.
STEP THREE
If any two or more of the following conditions are experienced by the machine or system, set the target cleanliness one level lower for each particle size.
- Frequent cold starts at less than -18°C (0°F)
- Intermittent operation with fluid temperatures over 70°C(160°F)
- High Vibration or high shock operation
- Critical dependance on the system as part of a process operation
Looking at the example above, if this system was expected to cold start and a failure could stop all production, the target cleanliness would become 15/13/11.
Using this three-step procedure the system target cleanliness code for the system is now set.
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