Need help with power steering problem. Must warn I know very little about tractors but do have operators, parts and service manuals. The problem is that it is just hard to turn. I did a complete service on the tractor this summer. After adding hyd. oil it turned a little easier for a very short time. It does turn to the right easier than to the left but not much. After turning either left or right, however, it does turn back very easy. My tractor has a front end loader also. The FEL was evidently added later as the levers are on a post coming up from the left support which runs from the front to back of the tractor. Am I right in that everything runs off the main hydraulic pump? Where should I begin to look for the problem?