The adjustment wing nut underneath a La-Z-Boy recliner is used to alter the tension of the chair. If you find it too hard or to easy to recline the chair while seated, you need to adjust the tension. Inspecting the tension adjustment nut for damage and making repairs is relatively straightforward. The chair's reclining mechanism might not work correctly, or at all, if the adjustment mechanism is broken.
Inspect the tension adjustment mechanism by turning the chair upside down. A wing nut attaches to the tension spring on the end of a small metal shaft or through the frame of the chair on each side of the chair. If a tension bolt is loosened or tightened too much, the spring can pop out or snap. Look on the floor underneath the chair if any pieces are missing.
Slip the tension spring back over the shaft if it has popped off and replace the wing nut. Look to the other side of the chair if you need help seeing how the parts go together. After replacing the spring, sit on the chair and test the mechanism. You might need to loosen or increase the tension a little: turn the nut tighter to increase tension, loosen it off to make the chair easier to move.
Hook the spring through the loop on the end of the wing nut if your La-Z-Boy recliner's is from the "Classics" range, making sure to pass the nut through the hole in the frame of the chair. Purchase a replacement spring from your local hardware store if the current one has snapped. Test the mechanism when you are finished and make adjustments as outlined above, if necessary.