I have a Kubota L2501and recently noticed that my right lifting rod will "creep" down when I am mowing. This results in the right side of my Land Pride RCR1860 cutter to drop. I have to readjust the lifting rod and have been making sure the lock nut is tight but it does it again. I have this rod lubed pretty thoroughly and wondering if that has anything to do with it. Anyone have any similar experiences with this?