Had a leak in my steering cylinder. Took it out and had it rebuilt at a local machine shop. Put it back in and reassembled the tractor. Took advantage of the opportunity and changed the engine oil, hydraulic oil and both filters. Tractor engine starts up just fine. BUT, the three point doesn't lift and the steering doesn't work. I followed every step in the Service Manual getting this work done. What could be wrong? Hydraulic pump seems to not be working at all?