I have the opportunity to buy a used trailer rig. It is manufactured by equipt, It is the small econo trailer. It is only three years old and has not been used much at all but there has been no maintenance performed. Right now I cannot turn the agitator more than a 1/4 turn. It has never been cleaned out. How would I go about cleaning and checking operation. I can pick this up pretty cheap because it is a POS according to the guy selling it. I think it just needs a good cleaning, any advice appreciated.