Horizontal Cylinder Seal Kit
The Horizontal Cylinder Seal Kit can be found on the bead breaker arms on the AM 500, 5000. On the Master 26, and J this cylinder is used for the mounting head assembly to move in and out.
Water is the main reason the cylinder fails. Rebuilding the cylinder will correct the problems of moving in and out.
The air lines is another common part that is often needed to be replaced.