I have a X585 that I've owned for about 3 yrs. Works fine and handles everything I need it to do. The problem I'm having is that when I put the loader on im not getting the lifting power I once had. If I try to pick up a bucket of topsoil it will lift no higher than about 3'. If I try to pick up my 62" deck or 47" blower it won't do it. Empty it raises and tilts fine. I just changed the filter and replaced the HY-Gaurd, didn't help at all. Any ideas as to what's causing the lack of lift power ?