lately the unit starting to move by itself - levers are in center postions - cannot stop unit- have to keep moving levers back and forth to stay in position !!
There is an adjustment for that down back at the pump. Cam rollers on the pump arms push against blocks fastened to the return spring plate. Cam rollers get worn then need adjusting. Procedure is in the Operation Manual, if you don's have on I suggest you get one. It is a little to detailed to post on here.