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I replaced the main idler arm bushing and sleeve. I had to go to my local lawnmower repair shop to press out the bushing. Mower works like a charm. Thank you all. I did not replace the belt it still seems to be OK. Thanks again!

I replaced the main idler arm bushing and sleeve. I had to go to my local lawnmower repair shop to press out the bushing. Mower works like a charm. Thank you all. I did not replace the belt it still seems to be OK. Thanks again!

Thank you. I have ordered the parts online. I will let y'all know if the bushings fix the problem. Thank you again for your help.

I don't mind getting my hands dirty, but I don't have a clue what a idler arm bushing is or where it is. What numbers do I need to look at? Thank you!

Thank you all for your responses. The model number is 991080, serial number is 011261. The belt looks good. It is just loose. I can take pictures if you want. The mower has 371.0 hours on it. Thank you for your help.

I have a Gravely Pro-turn 152 and the belt spins two of the blades is very loose. What tightens the belt? I just don't readily see an easy way to tighten it. Or, do I just need a new one? It has 369 hours on it.