To adjust the tension belt on a Craftsman DYT 4000, first, ensure the mower is turned off and the key is removed. Locate the tension adjustment mechanism, usually found near the engine or under the mower deck. Use a wrench to either tighten or loosen the tension adjustment bolt, which will change the tension on the belt. After making the adjustment, check the belt's tension by pressing down on it; it should have a slight give but not be overly loose.
The alternator is rotated on it's pivot to adjust belt tension.
Adjust it.
Loosen the alternator tensioner bolt. You will be able to slide the alternator either way to adjust the tension on the belt.
If it is a drive belt and not a serpentine belt is has no tensioner. You manually adjust the tension by normally adjusting tension by moving the alternator. Loosen to bolts holding the alternator in place and then adjust the tension. Tighten the bolts when the tension is right. If it is serpentine belt if you follow the belt around the the engine you will see the tensioner.
There is no way to adjust the belt tensioner, if it's not keeping enough tension on the belt the complete tensioner itself will need replaced.
To adjust the belt tension on a car, locate the tensioner pulley and use a wrench to turn it in the direction that loosens the belt. Once the belt is loose enough, adjust the tension by moving the pulley or bracket that holds it in place. Tighten the belt by turning the tensioner pulley in the opposite direction. Check the tension by pressing down on the belt, it should have a slight give but not be too loose.
you do not adjust tension on a serpentine belt the tension is automatcally adjusted if the belt is loose, replace the belt SOME TIMES THE TENSIONER CAN BE WEEK ALSO.
To adjust belt tension for optimal performance, first locate the tension adjustment mechanism on the belt system. Use the appropriate tools to loosen or tighten the tension according to the manufacturer's specifications. Check the tension by pressing down on the belt at the midpoint between pulleys - it should deflect slightly. Re-adjust as needed until the proper tension is achieved for optimal performance.
To adjust a belt properly, first locate the belt tensioner and use a wrench to loosen it. Then, adjust the belt tension by moving the tensioner until the belt has the right amount of tension. Finally, tighten the tensioner back up and make sure the belt is aligned properly on the pulleys.
If it is a serpentine belt, the tension is automatically adjusted by the tension idler. If the belt is loose then the tensioner needs replacing. If it is a normal drive belt, then the alternator is mounted on a slotted bracket that allows you to adjust the position of the alternator. You can loosen the bolts and adjust the tension on the belt.
Should have a spring loaded belt tensioner
Apply a wrench to the center bolt on the pully and turn it will adjust the tension.