Stoping Western V plow wing from floating back

Depending on which side is floating back you must remove the primary and secondary relief valves for that side.  If it is the left side that is floating back you must remove the releif valves located at the front, lefthand side of the valve body.  They look like two flathead screws one on top of each other.  Remove both of those and the ball, spacer and the spring.  Clean all the pieces and replace into the proper hole.  The secondary or top one turn it in untill it stops and then back it off 1 and 1/4 turns to 1 and 1/2 turns and for the bottom or primary one turn it in untill it stops an back it off 1 and 1/2 turns to 1 and 3/4 turns.  If it is the right side that is floating back you must remove the relief valves located on the rear lefthand side of the valve body these also look like two flathead screws one on top of each other.  Remove both of those and the ball, spacer and the spring.  Clean all the pieces and replace into the proper hole.  The secondary or top one turn it in untill it stops and then back it off 1 and 1/4 turns to 1 and 1/2 turns and for the bottom or primary one turn it in untill it stops an back it off 1 and 1/2 turns to 1 and 3/4 turns.  This should fix your problem, if it does not you should see your local Western V plow dealer.