While you wait for answers, we may have found some information which could help you.
Click here for Belt Changing ChangeHow to fix idler clamp assembly (hardwood/carpet switch) on Eureka SmartVac?
Older Eureka Boss Possilbe short?
need diragram for a Eureka The Boss Pro?
Eureka Boss Smart Vac Thermal Cutoff ?
How do I remove the canister motor 116.21514?
eureka 4870B smartboss, upright vaccum?