I own 2910i with BL10 loader, my bucket did the very same thing, I had replaced loader joy stick and valve, then my brother suggested I find a machine shop and ask about rebuilding cylinders on bucket and joy stick control . If when you remove cylinder and rod falls out instead of staying inside cylinder tube, the cylinder is bad, mine was, so I took both cylinders,even though the right one stayed retracted,best to do both. I paid about 250 for both,and about 150 to have joy stick valve rebuilt, I was very pleased. The cylinders are metric. The loader would lift, the bucket would tilt if I held joy stick,then that didn't work, so by loader lifting most likely loader joy stick control valve is not the problem, the bucket cylinder 's seals and wipers are bad, if rod isn't bent, rebuilding in my opinion is way to go. Thanks