HI, it's Jim from Crucial Vacuum!
If your Shark NV350 vacuum is making loud noises when switched to carpet then there are a few parts of your vacuum you can check to resolve the problem.
First thing let's check your vacuums canister. The idea is to prevent clogs and anything that will obstruct your vacuum from operating properly, and running smoothly without noise. You'll want to empty your canister after every use.
Secondly, let's check out your brush roll. Is there hair wrapped around the roll itself, or any noticeable debris that would prevent the brush roll from turning? If so remove it and manually rotate the brush roll to help unearth any hidden clogs behind the roll.
While you're examining your vacuums brush roll take a look at the belt as well. If the belt isn't wrapped around the brush roll properly this could be causing the noise. The belt should have a good bit of tension on it in order for the brush roll to turn properly. Your vacuums belt should be replaced roughly every 3 months. So be sure it's on properly and has a good bit of tension.
You can purchase replacement parts for your Shark NV350 direct from Crucial Vacuum with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10
I hope this was helpful. If you would like further assistance, please feel free to give us a call at 877.750.9239. We have helpful and friendly customer care representatives on the line ready to assist you.
Crucial Vacuum Customer Care