OK I am going to re-visit this, on my 53 naa we put in a new piston after doing some other work as well. I put in TSC UTF oh the trans, hydro, and rear end. The first few times running the tractor it took about 5-7minutes before it would lift the arms. Today I went to use it and after running for 20 minutes they still wouldn't lift. Do I have the wrong oil? What should be in there? Thank you.