Took my back hoe off my BX22 today, and installed the 3 point hitch. The arms will lift and lower, but as soon as I put the weight box onto the lower arms, the tractor was unable to lift the weight box. Never had a problem like this before. Both the loader and the backhoe were working fine prior to removal. The only thing that I did notice this summer, was that the mower deck was slow lifting. I have checked all hydraulic connections, and they are all properly connected. I have the valve under the seat open, and the mower arms set at "top". The hydraulic fluid is at the correct level on the dipstick, and I also pushed the RPM's to maximum, thinking that it might be a pressure problem. I am leaning towards something binding, but I can't find anything that is bent, or looks out of place. I was thinking that possibly sometime this summer, when mowing, that somehow the mower deck might have gotten bumped, but I don't see any damage to the deck that would indicate a traumatic injury to the lifting mechanism. Any and all suggestions will be greatly appreciated. I would rather plow with my weight bucket on the tractor, instead of having the backhoe installed for weight. thanks