I just bought a vermeer sc252 , I think the belts need a little more tension. It gets some squeal going on when a heavier load is applied. I never considered myself a mechanic so I thought I would ask to tension the belts are the tensioning bolts located on top just behind bearings , the square head bolt ? It seems like thats the right one but I thought I had better ask someone who has done this before. Thanks in advance.