For anyone with a Case/Davis 100 backhoe if it seems little weak on the crowd there are relief valves screwed into the top of the valve bank above the crowd and the boom valves. Mine was a little weak so I took the crowd one out and they are adjustable. Haven't had a chance to fiddle with it yet but the book says they are preset at 3000 lbs There is no way to lock them in position so in 30 or 40 years they probably back off some.