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I was reading on the internet that the return line should ideally be zero PSI but in some cases could be up to 100 PSI, i really have no clue about this. I was thinking if the return line has no pressure, gravity feed, then all the plumbing the cooler and filter should run down hill from control...

Long time lurker first time poster, can not find an answer to my question. This is on a mini excavator, it is my understanding that the return line to the hydraulic tank should ideally be zero PSI but could be up to 100 PSI, does this mean my filter and cooler should be no higher than the return...