Why does the head panel for my 700 lb Hill-Rom® Stretcher keep drifting back down? Why does the head panel for my 700 lb Hill-Rom® Stretcher keep drifting back down? Why does the head panel for my 700 lb Hill-Rom® Stretcher keep drifting back down? It may be that the gas cylinder is worn out and needs to be replaced. Refer to service manual 144386.