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Possible causes: One of the control valves in the pump is stuck or disconnected. The linkage or control quadrant is mis-adjusted, disconnected, or broken. The piston is a tight fit and you have no weight on the arms. It might be possible to narrow this down with more information: When the arms come up, do they rise and shut off the pump normally? Or do the arms hit the mechanical limit, and the pump relief valve screams in protest as the pump tries to continue to lift the arms past "all the way up"? Are the symptoms the same in both position control and draft control mode? How much weight are you putting on the arms when they "won't come down"? If you put the touch control all the way down, and then press down on the arms, do they feel like they are raised rock-solid, never to come down again, or is it more of a spongy resistance? How long does it take the arms to drift down if you shut the tractor off? Did you do anything with the hydraulic pump, or only the lift cover and piston?
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