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There have been issues with the bearing and the idler pulley on these machines. Here is a parts break down: http://www.searspartsdirect.com/partsdirect/part-model/Swisher-Parts/Tractor-accessory-Parts/Model-T11544/3291/1500230/P0708055/00004
I just replaced the belt on my 44" Trailmower and since I had to get it up and running without waiting for new Swisher 4220 belt I found an ordinary V-belt 1/2"X72" whith overall with of 74" works OK
Check that you have routed the belt correctly. Did you happen to go to the outside of the idler? Also is the belt the correct size requiring the idler to put tension on the belt to drive it Belt should be loose when idler is disengaged.. See sketch:
Pull the belt cover off on the side of the engage lever and you will see that it is not a wire cable that engages the idler pulley. It's a rod connected to a long spring. Perhaps the spring came off or is defective as it puts tension on the idler pulley against the drive belt when you engage the blades. Further, there is a return spring to pull the idler pulley away from the drive belt when you disengage the blades. Check all the connections for the springs and see that the engage lever is mounted tightly. Also check the idler pulley itself.
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