Unfortunately, that's not a question for which I have an answer, nor is it one Endless Pool is likely to help with.

However, if you locate an industrial hydraulic supply house, you may well be able to get those answers. (A tractor or heavy equipment mechanic can probably tell you where the closest supply is.). Once you find one, take the filter, the oil can, photos of the motor, and your EP manual with you. My guess is, all 3 of those -- filter, motor, & oil -- are standard, if you can just find them.

And, if you succeed, please post back what you find. Others have asked some variant of this question, but I don't believe we've ever had a reported answer.