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If your Kirby is just sitting on a hard surface and is shaking, something is either on the fan or brushroller putting it out of alignment. Here is how to change the fan / impeller if broken. how to change Kirby fan / impeller.
If it shakes while you are pushing against the carpeting you can try adjusting the height of the brush until it is just touching the carpeting. Some thick pile carpeting the Kirby will still shake or jump on, the strong suction causes it to trip over the thick pile that is lifted up when vacuuming.
The armature that holds the fan on is reverse threaded. It turns to the right to remove it. You can put a nail or nail punch in the hole on the armature and tap it gently to the right. this should loosen it enough to unscrew. There's a washer, then the fan, and a spacer that fit over the shaft.
POSSIBLE CAUSES: 1) Sometimes there is a piece of debris in the fan case. (Not likely, but possible) Take the power head, handle and cloth bag off of the Kirby, pick it up and turn it with the fan toward the floor and shake it to see if something falls out.
If there's nothing in there and it still makes the noise, you most likely need to replace the fan/impeller as it is probably cracked or broken. You can sometimes see fan damage by removing the power head, looking into the hole in the front of the Kirby and slowly rotating the fan by using the shaft in front. The damage can't always be seen that way, but if you can't see it, you'll need to take the fan case off so that the whole fan is visible to make sure. I have written complete instructions that should lead you through the whole repair.If neither of these things are found to be the case, check the carbon brushes. I don't have a guide written for this yet, but my switch repair guide (link below) will help you break down the Kirby to get to them. Unscrew both brushes, take them out and look at them. The remaining length of brush will pop out of the holder and if they are shorter than 1/2 inch long, I recommend replacement. (they are not expensive)
if your looking at the back of the switch were the wires go in. Starting from left to right. you will see letter below the hole were the wires go in. for example, Y , yellow or " R " for red. this should help.
From the rear, there are 3 screws on right and one on the lower left. There is 1 more on the front at the top just under the lamp. You will also need to remove the safety switch - the plastic thing down and just right of the front screw. Take out the 2 screws. Pull the switch gently away from the case and try to get a look at how it's put together. There is a bent rod inside with a plastic 'bar' holding it in. The flat end of the rod is on top - the round end at the bottom goes into a loop on a metal strip that is sticking out from the motor housing. By lifting up and wiggling, the rod will come out of the loop. Often, the plastic bar will come out and rod will just fall out. Just put the rod and the plastic bar back together (this is why you looked at it before). I tape the bar in place with Scotch tape or any thin tape and leave it that way. The fan housing is sealed with caulking (or whatever the last person to service it used). A few raps on the side of the case with rubber mallet and/or sticking a thin putty knife in the joint should do. You will need to scrape the joint clean and reseal it when you're done or it will blow dust like mad. Any caulking or gasket sealer will do. Just don't use high strength adhesive if you ever want to take it apart again without dynamite. Btw, the fan pulley is a left-hand thread.
I am assuming that you are trying to remove the fan. On newer models there is a cut on the shaft (rear of the motor - next to comutator) that allows to use a wrench to hold the armature, it may be very similar on older models. maybe a hole instead of the cut... You would have to access the rear of the motor though. Let me know if you cant find it - I'll take one Heritage apart here in the shop and will see.