Twist the bag emptor left to remove it from the upright then your need a sharp narrow pointy object (like a metal dental pick cost $1 in most stores) push it under the plastic band around the rubber on the bottom of the cloth bag roll it across and take off the plastic tie once off pull the rubber bottom part of the bag emptor take out the inner plastic tube and zip the bag put in the washer by itself and wash with soap and softner and let hang dry you can also wash the inner plastic tube with hot water and fabuloso I recondition kirbys and do it all the time.
sounds to me like the peoblem is with the brushbar,try taking the brushbar out then trying it again if it's ok i would sujest the bearings on the end of brush are bad and need replacing..
I just took a stiff piece of coax cable, and took the bag off where it attaches to the main unit, and took the head off ( the part with the brush roll in it) AMD cleaned every thing really well, turning the spindle for the fan while " snaking" it and pulled out a baby sock! Ta-Da! Works like New.
It can be fixed by yourself, if you are some-what handy. The part is called snap fill tube and the part number is 1900399 your local vac repair shop should be aware of this number part sell for about $9.00 to $14.00 hope that helps.
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:
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has either broken or fallen off. There is a magnet on the beater bar that activates the LED green light when it's spinning. 
