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We had the lift valve get stuck when it got too hot because of a too heavy load, when you jerked the clutch to wheelie the load to the ground, the pressure went down for an instance, freeing the valve and dropping the front end to the ground.
id start by checking the linkage on right side of tractor below floor plate for correct operation. we had the opposite happen, links dropped and wouldnt raise back up and it turned out to be the center bolt had gotten loose in the mechanism that was actuating the hydraulics...