I've got a ym2610 that will quit pulling when it gets in a bind. Some gears worse than others. I immediately thought clutch slipping but I have decided that's not the case. It's got 4 manual gears and RN123 in a hydraulic fashion. I think it's something to do with the hydraulic part. I've drained and checked/cleaned the filter and put in new fluid. The tractor has 20hrs or so on it. Any help would be appreciated. Thanks.