I presume the motor is running, take the front brush roller off and check the fan is still intact. Possibly broken fan.
There's two possible reasons for no suction on an upright if the motor is running. Either your fan is broken or your air passage is blocked inside the machine, not the hose. A vacuum will still have suction if the belt to the roller is broken, the belt runs the rollers, not the fan. The shaft that the belt is connected is also the shaft for the fan. Look inside and see if there are fan blades or are they broken off. If they are broken off then you will have to replace the fan unit. If the fan is in tact and is spinning, then you probably have a blockage. Check inside where you attach your bag. You may have to disconnect the hose that actually connects to the bag, or in some cases, that tube is clear so you can see blockage. If you cannot see through it, then simply take it off and look in both that tube AND the airway that feeds that tube. Either way, a broken or worn BRUSH belt will not stop the suction, that comes from the fan inside the vacuum housing. I hope this helps.
SOURCE: Fix for broken tubing leading into filter bag?
You can replace the black tubing. There is no need to get a new vacuum. You can find the parts you need by following the link below.
http://www.usavacuum.com/Kirby-Generation-3-s/145.htm
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SOURCE: Need Kirby Generation 3 Vacuum cleaner manual.
If your brush roll is turning and your bag is not overly full, then the only other thing it can be is a clog where the bag connects to the vacuum. Turn the plastic part out away from vacuum and lift off to see if you have something clogging it. It would have to be something big, but not so big that it could not get past the fan. As a rule of thumb, KIRBY never clogs. I suspect that your belt is stretched out and your brush roll is not turning while on the carpet so the brush roll is just in the way rather than brushing your carpet to pick up dirt.
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