Advice on used hay rake

I am looking at possibly upgrading my hay rake. I currently have a NH model 56. I have the option to buy a used 8 wheel hay rake. This should cut my raking time in half, hopefully. I currently just hay about 10 acres but have possibly secured some more property for next year.

Is there anything in particular I should look for condition wise before making an offer on it on the rake?

Advice on used hay rake