I have replaced the v belt on my riding mower. It worked fine until it jumped the track along the transaxle pulley. The old belt is chewed up in the same location as the new one. If I could tighten the belt once it is installed that probably would take care of this problem. I do not know where you adjust the tension on the belt once you put it on. Please tell me how to adjust the tension on the v belt. PS It is not in the manual.
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Since you mentioned "48-inch riding mower" let's assume your question is about the mower deck and not the overall mower or its main drive belt (if manual shift-on-the-fly model). If the belt burns that means it is running but slipping against something; or that the drive sheave us turning against an impeded belt. In the first case the belt will be burned along its length; in the second the burning will be occuring in one location(s) along the belt. In any case of belt slippage, check first that all tensioners (springs) are properly in place and not broken or fatigued and in need of replacement. The only other thing would be resistance to belt running, such as:
blade blockage; blade rotor resistance from lack of grease or ruined bearing in need of replacment; grass clogging on deck underside or under blade drive pulley on deck top side; a pully sheave out of round; an obstacle between belt and sheave that is preventing free turn of sheave and belt run; misrouted belt; an overstretched belt that cannot be sufficiently tensioned. Inspect and correct or replace as needed.
there should be a drive belt tensioner somewhere on the belt, it usually works off the clutch/brake, when you push on the brake it apply's the brake and also takes the tension off the belt to stop it from moving.
Not sure of your ride on mower but that is how my ride on mower works so I hope this helps.
I believe you may have the belt over one or more of the belt retainers next to the pulleys. They are 5 or 6 inches long and about a 1/4 inch in diameter. You have to loosen them when you put the belt on then adjust them to where they are just barely touching the back of the belt. They keep the belt from jumping off.
Check the drive belt. It probably has chunks missing or at least has flat spots (narrow spots) that cause the belt to jump every time it goes around a pulley. That will set up a heck of a vibration. Also check the pulleys for free movement. The drive belt is above the blade drive belt....