I had the same problem a few years back. I called the Ranger factory and spoke with one of their techs. He said never grease it or spray anything like wd-40 or silicone on it. I was amazed, wd-40 will fix anything, right ? Haha. He said spray windex on the pole before sliding it in. So, I did It works great. I hope that helps yours as well.
Life is Short, so Ride a Harley, Fish out of a Ranger, Marry a Beautiful Woman, and TRUST GOD ! ! !