I have a FEL and a 3pt rear blade (for snow) which are controlled via a diverter switch/lever as to which attachment I want to use. lately the hydraulics action has been jerky when raising the implements. It has been years since I have taken this apart, is there something that I should look at in particular?? Oil level is OK and clean, changed it a couple years ago, the tractor is always stored in a shed and never out in the rain. Have owned the tractor since 1980. Rebuilt the internal lift cylinder in early 90's and converted the piston to one with O ring seals rather than the metal rings. That can't be the problem because it isn't used when using just the FEL. Any ideas??? Thanks, Leon