Sovereign 48" deck belt oscillating

[bigdog46 2]

On one of my 48" decks on a Simplicity 7117, the long straight part of the belt between the 2 outer deck spindles oscillates and makes a fluttering noise.  Just wondering if someone else has had this issue and what they did to eliminate it.  Thanks. Gary.

[Mike_H 92]

Mine does it too, and I noticed on the deck covers there are a couple of brackets that look to support the belt and prevent fluttering.  I think the "real" way to fix it would be to increase the belt tension. 

[yukon 331]

i noticed mine doing it yesterday pulled the deck off and the belt found some of the belt was missing put another belt on and it was fine.

[MikeES 458]

It can be caused by one or more of the pulleys not exactly round (and this could be in the spread of the flanges) and or a belt that is not exactly the same cross section all the way around.

[BLT 718]

Also a belt problem is caused by the tensionser is not moving freely. That will eat belts faster then anything else..