It is very noisy when it runs.
Could you describe the noise for us?
Is it a thumping noise, rattle or grinding noise?
Could you post a video of it on youtube so we could hear the noise it's making?
If the drum support rollers or belt idler are bad they would be noisy when you spin them by hand and/or have a lot of play in them on the shaft.
If a chunk of the belt is missing it may make a thumping noise, but I don't see to many belts that do that.
If the felt seal is bad enough is can cause a lot of noise because the metal drum will be rubbing on the metal of the dryer.