The 542 loader has links between the bucket and bucket cylinders, the 553 does not. What are these links for? To give the cylinders more leverage when curling the bucket? To let the bucket dump at a greater angle? It looks like the 553 will pickup about 400lbs more than the 542, both are NSL. Does the 553 have bigger cylinders? I could not find any specs on JD website. I only got a message "no john deere model found"