As already stated, if the bearings have been replaced, they may not be the correct bearings or installed properly. There should be a small hole in the outer bearing race that lines up with the grease fittings. If it were me, I would purchase two new bearings asap just in case. Be sure they have the hole in the outer race. If you throw them in the freezer overnight, they will be easier to install. In the mean time, remove fittings and blow out all the grease. you should be able to look into hole and see if there is a hole in bearing race. A small pick may help. If there is no hole, then the bearings are wrong, were installed wrong, or have spun. If they spun, you will probably need a new tensioner, as the bores will be damaged and new bearings will probably spin too. I personally would not try to remove bearings until I had new ones ready to go. I would removed pto shaft and pin from bearings and grease them manually to get by if a need to use thrower.
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