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case 580 SK hydraulic pump issue

Ron White I think I messed up my hydraulic pump changing my serpentine belt. I drove wedges to push the pump coupler forward so I could slide the belt in, it was difficult to slide. The belt was fitted but afterward the hydraulics where weak especially on picking up the boom, riggers and lifting the loader. The boom will still lift the tractor off the riggers the riggers still lift ok. When idling, these lift function barley work at all.
Could the pump be fixable? or is it time for a rebuilt one? I was being careful not to bend or damage the crankshaft pulley and wondered about the loads I was putting on the pump shaft, I guess I have my answer now.

AJ Never heard of that happening before,the spur gear in the pump must have dug into the wear plate and cut a groove in it,it would only take a few turns to do that if the gear was held tight against it,the oil is escaping through the groove,if the coupling had anti seize grease on the splines that would not happen,looking at the parts drawing all the parts seem to be available,you can look at the on-line catalog at the link below,click on find parts by model,type in 580SK, choose first one then hydraulics,the Case part # of a new pump is D149283,re-manufactured D149283R,check on Ebay,Google the part number on it's own and it will find any that's advertised.

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