Hi
If you vacuum is making a loud “roaring” noise it’s probably one of two things
1)something is loose inside
Or
2)something is loose or had worn out in the motor
Here’s a disassembly guide
Shop-Vac MC150A Motor Replacement
If you go as far as the motor ,pay close attention to the motor bearings and where they are seated,if they have any play in them they are most likely your issue
Hopefully this helps
Any questions please ask
Thanks:-)
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