I have a 67 farmall 1206 that had some hydraulic leaks. One of the leaks was on the draft sensing shaft of the three point. I completely disassembled the three point, drained all the hydraulic fluid and replaced the two o-rings that were leaking around the shaft. I put everything back together without putting the three point arms on, and when I started the tractor up, the top three point arms went all the way up and I cannot get them to go back down. Everything else hydraulically works fine. I tried working the draft sensing lever back and forth and I still can not pull the arms down. Can someone tell me what I am doing wrong? Any help would be appreciated. Thanks