My hydraulics are acting up on my Bush Hog 52ES zero turn. When I leave the engine running and put it in park, say to get up and move a branch or something, and get back on.. when I engage the drive handles the right side is stiff on me. I more or less just have to push through it a little and it loosend up after 10 seconds or so, but it makes me nervous like I might be having some serious problems. It's about due to change the hydro filter, and that may fix it but does anyone know what's going on here? If it matter I think it uses 5w-20 regular motor oil in the hydraulics..