Yesterday I was using my 2011 JD 4520 compact utility to move snow with front loader and rear back blade. Everything worked perfect , got all the neighbors and myself cleaned out . Took a break for a few minutes ,shut tractor off ,came out started the tractor and the lever for the 3 point would only go back about 2/3 of the way up and the blade would not go up at all.I can get the lever to go all the way up now .Oil level is also good. I checked the cable and the lever on the side of the rockshaft and everything is working. I also checked the draft control to see if that got turned in or out, no luck .Any ideas on what may have happened ? the shaft going into the rockshaft is moving with the lever. Also my hydro and loader work fine. Thanks for any input.