My left rear lift arm pin, came out, detatching the arm from the tractor. Not knowing this, when I lifted my bush hog, the arm came forward, hitting the drain plug underneath the tractor, knocking out the plug, along with a chunk of cast iron housing. If I can't get it welded back, on, it looks like the entire housing will have toi be replaced, costing BIG bucks. This isn't the first time that pin had come loose. The right side had never come loose, and I don't see any to keep it from coming loose...