3) After the 30 minute period, plug the vacuum back in and turn on the switch. Next, we will learn how to change a u-belt on your Eureka Vacuum. Eureka Vacuum Cleaner 2940. Turn unit on and walk around house listening for a leak, starting in these areas. The air should sound louder and higher pitched where there is a leak. Belts should be replaced every twelve months for optimal performance. Eureka Upright Vacuum Cleaner Household Type Owner's Guide 2940, 2969, 2970, 2999 Verify all vacuum inlets are installed correctly and … First, press on the foot pedal and lower the vacuum … If the vacuum still does not work, call the Eureka customer service helpline. 30 minutes before attempting to use the vacuum. How to Change a U-Belt on a Eureka Vacuum.