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were you put the belt on see if any thing is rubbing against shaft.it may have been the belt,replace the belt and clean out the bab and also the floor brush.
When the green lights do not come on when vacuuming with a Kirby, this indicates that your belt has either broken or fallen off. There is a magnet on the beater bar that activates the LED green light when it's spinning.
Here's a helpful video tutorial that we recorded, that will show you how to replace the belt, as well as perform basic maintenance on your roller brush to prolong the life of your belt as long as possible.
Video Repair on How To Check The Belt on a Kirby Generation G4:
I hope this was helpful! If you have any follow up questions, please feel free to use the comment field here on Fixya.
If you need to purchase a new roller brush, or belt for your Kirby G4, here are direct links to those parts on our website:
If this repair was helpful to you, please be so kind and rate my repair helpful, or leave feedback for me. This is really appreciated by the Fixya community when someone answers your questions.
We recently recorded a very helpful video that will walk you step by step
through changing the belt on your Kirby G4. Also the video will show you how
you can do routine maintenance on your roller brush that will extend the life of
your belt dramatically.
If you haven't already purchased the belt for your Kirby, here's a direct link to the belt that your Kirby G4 uses on our website,
I really hope that the video was helpful. Please feel free to use the Clarification Request here on Fixya if you have any questions about how to change the belt. I am always more then happy to help you further diagnose your machine if my suggestion didn't work. If it did, and you found it helpful, please kindly rate the review as helpful by clicking on the thumbs up icons. Thank you very much.
Take the nozzle of, remove the brush roll, put the a new belt over the brush roll, re-install and put the bottom plate on, making sure that the belt is in the middle of the brush roll. Turn the big knob on the front until it locks, when it grabs the belt it will be hard to turn. Re-install the nozzle on the machine and lock it down. Turn the knob again all of the way, this will release the belt unto the pulley.
Put the belt over the brush roll, set it in the middle, put the brush roll into the head and put on the bottom plate. Turn the big knob on the front of the nozzle to catch the belt, turn it until it locks into place. Then put the nozzole onto the front of the vac, then turn the knob all of the way the other direction, it will put it on the motor pulley.
has either broken or fallen off. There is a magnet on the beater bar that activates the LED green light when it's spinning. 
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