A wing lawn mower for cutting grass is herein described. The wing lawn mower is attached to a main mower, the wing mower moveable from a lowered position to a raised position. When in the lowered position, the wing mower is driven by a wing belt, which is in turn driven by a main mower deck pulley. When the wing mower is moved to the raised position, the wing belt becomes slack. The slack causes the wing mower blades to cease turning. Then the wing mower is lowered into the cutting position, the wing belt pulled taught. When this occurs, the wing belt is guided back into place against the wing pulley by belt retainers. This allows the wing mower to be raised and lowered without having to remove or reconfigure the wing belt.
