Having a little difficulty with the 5088. The hitch arms are only going up about halfway with the position lever. If I pull the draft control lever all the way to the light side the arms will raise all the way up. Problem is when I push the position lever back down the arms wont go back down even with a large object on the arms. I have to push the draft control lever all the way to the heavy side for the arms to go back down. So basically the position lever isn't doing anything. Does the linkage come together somewhere in the back? Is there a possibility the linkage is rusted together or something? It was working fine about year ago, but it had been sitting for the winter.