I have a hydraulic system with following specifications:
- oil: Petronas Sunvis 846 WR - HV, 3000l
- max pressure 160bar
Every 2 weeks I have to change the 2 off line 3µ filter elements because of filter blockage.
We analysed the oil and the results are good. No severe contamination.
Now we analysed the filterelement and a there is a gelatinous substance with high viscosity on all the surface of the membrane
toluene insoluble: 54,74 %wt
heptane insoluble: 55,06 %wt
The oil temperature before the filter is 35°C and the tankvolume is less than 1000l when the machine is in full operation.
Is it possible that the VI improvers or antifoam additives block the filter element?