On a zetor 6211 I’ve purchased when the pto is off the lift arms don’t work, how can I set it where the lift arms work when the pto is off, I put the pto lever forward as far as possible which is recommended in a YouTube video to only engage hydraulics but the pto shaft was still going slowly. Also when engaging the pto when the tractor is on it does a lot of grinding so I just turn the tractor off and engage it then start it up again, saves all the grinding, why does it do this grinding? Is this easily fixed?