I've got a Huskee 22 ton splitter and over the years I've managed to tear it up pretty good. The wedge is cracked and now dented, the metal stops to dislodge a stuck log are all twisted and the gas tank leaks. I've never replaced the hydraulic fluid or filter. How often should that be done? Where do you get a filter? I've talked to some small engine repair shops and it doesn't seem as though they have a lot of experience with them. I can't find replacement parts on line anywhere. Help would be appreciated.