I have a very old Kobelco k909 don't use it very often, last i time i used it for a couple of hours the longest it's run for years, went to use it again but the hydraulics are not working very fast and now I noticed the hydraulic tank / reservoir gauge is empty it was fill when i started it, after looking for leaks and find none, i see the return tank is fill to the top and for some reason not flowing into the tank / reservoir, the filters are quite new so can't be that, hydraulic fluid only returns back to the reservoir tank after it is sitting for hours or you open the tap on the tank to let air in, any help would be appreciated.
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