Shorten the rod. Sometimes rod will stretch after installation in deep set wells. Loosen nut and repack gland. Replace the pair of pitman arms. Never replace just one.
Pitman arms keep breaking.
Cause pitman arms to operate in bind. Always replace large gears and pitman arms in pairs so load is distributed evenly. Check table for recommended cylinder size and depth. Setting mill to short stroke may eliminate the problem. Check stuffing box and repack it if necessary.