Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Does your belt touch your brake rod, after you lower your deck? Check to see if your brake rod is bent or distorted. Also, check the idler arm that your idler pulley attaches to, to see if it have excessive up and down movement.
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Thanks for the update. The squealing could be caused by a worn spindle pulley allowing your belt to run deeper inside the v-groove, than it usually does.
Also, check to see if you have a worn bearing in one of your spindle housings, or one of your idler pulleys. If one of your bearings are partially seizing, this can cause excessive drag on your belt, during start up of your blades.
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Remove your belt from your deck. Spin each spindle pulley and each idler pulley by hand, as you listen for a noisy bearing, and watch for a wobbly bearing.