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Assuming you have the motor out of the fan housings, check to see if you can move the fan around clockwise/counter-clockwise. If the fan is not moveable, the fan has probably melted to the motor housing. Replacing the motor is recommended as the plastic motor housing under the fan is probably damaged/melted. It could still be fixed but there is a possibility of damaging the housing. If after removing the fan following the directions below be sure to remove/trim any melted plastic away from housing before replacing fan. Not trimming the plastic could result in your new fan melting again to the housing when the machine is turned on. If you have an older model pay careful attention to the carbon brush area, if there are plastic posts holding the carbon brush springs, these are easy to break.
If the fan is movable, remove the nut and washers from fan. Use two large flat head screwdrivers and place them opposite of each other under the bottom lip of the fan between the fan and motor housing. (it might be a little easier if you have an extra pair of hands to hold the motor). With the flat heads in place, push the handles of the flatheads toward the side of the motor where the belt shaft is. If the fan does not pop off rotate the position of the screwdrivers and try again. Pay close attention that the fan washer is installed before replacing your new fan. after installing the new fan, rotate it several times making sure it isn't rubbing anywhere.
If you need any further help feel free to contact me.
There are two causes of your problems: 1. The fan needs you to manually turn it to start running. Problem: The motor bearings both ends are dried out. Solution: 1. Remove the motor/fan from the motor housing (there are two screws that hold the motor to the housing. The only way I know how to get to the screw is to bend one of the fan blade up and use a long screw driver to get to the screws. 2. Remove the two screws that hold the bearings to the motor. 3. Detach the bottom bearing (opposite of the fan end.) You might have to use a flat screw driver to pry the bearing off. 4. Use a Q-tip and soak it with motor oil or grease then lubri- cate the fan end shaft/bearing. 5. Use a Q-tip + alcohol to clean up the bottom bearing hole, then lubricate it with grease or motor oil. 6. Put the motor and bearings back together and make sure that the fan can turn freely now. 7. Install the motor/fan back into it housing. The fan should turn on its own without you helping it. If the fan won't turn, you have a bigger problem. See below.
2. The fan won't turn at all and is really tight even when you try to turn it by hand. Problem: The transformer coil(s) is/are burnt out. Chances are you let the fan run dry to a point that it squealed and started to smell like it was burning before it quit all together. Solution 1: 1. Remove the filters and their housing on the bad fan side. 2. Duct tape a piece of plastic over the bad fan opening. 3. Run the humidifier with one fan. It works just as well.
Solution 2: 1. Buy a new humidifier. 2. Make sure you lubricate the bearings as soon as the motor begins to squeal.
Solution 3: You need knowledge of electricity 1. Take the motor/fan out from the housing. 2. Use a vote meter to check the resistance in both coil of the transformer; should read about 17 ohms. The coil(s) that has a high reading or if the meter shows 'OL' is bad. Remove the Yellow tape from the coil to see if you have a loose soldering joint between the coil wiring the electrical cord. If yes, solder the joint back together, check the resistance again to make sure you have about 17 ohms. If the answer is yes, put the yellow tape back on the coil and use electrical tape to secure the tape. Hopefully, the fan should work now. Good luck!
Your grinder is either working too hard because of broken or seized bearings or the fan is broken or detached from the armature. Take the brushes out then remove the four screws holding the gear housing on the motor housing. Remove the armature and check the fan and both bearings. If the armature bearings and fan are OK check the bearings and gear teeth in the gear housing.
Since you didn't leave a model number, I will have to give you a generic answer, instead of one with a part number of the most likely replacement part. Normlly the problem you discribe is a result of the blower motor bearing wearing out and letting the fan blades rub against the housing. And since the bearing is internal to the motor, you have to replace the entire motor.
if you run your vac to long after the fan is broke it will cause excessive vibration and the bearings can go out. in almost all cases i replace the fan only. most of the time if you have a bad bearing the vac will make a grinding noise. you can also tell a bad bearing by grabbing the belt pulley on the end of the fan and pull up and down if it moves alot then your bearing is also bad. you can get the bearings separate witout ordering the armature assy. when talking of replacing any of these parts besides the fan i would advise you to take your vac to your local repairman. working on motor parts of a kirby can get pretty involved. to replace the fan first take the housing off where your belt and brushroll are. you should then see 5 screws on the front of your kirby. remove all 5 screws. then remove the handle. at the very bottom of your handle you will see a piece that allows you to move the handle, on the back side of this you need to push in with your thumb and the handle should pull off. then you should see a plastic piece directly below that snaps into the top housing. remove the 2 screws from this. one where the cord boot is and one above your power drive neutral/drive lever. then under this plastic piece is 2 more screws on your top housing. when these are out your housing should pull off. if not then remove the bottom plastic housing of your outer bag. then go back and look at the front again and you will find since removing the top housing you have exposed 2 more screws in the front fan cover housing that also need to come out. after this pry this housing off and you should be looking directly at the fan. grab fan with pliers in one hand and with the other hand apply pliers to the silver belt pulley and turn this piece clockwise. it should unscrew and then you can pull your bad fan off and attach the new one. i hope this helps and remember its not as hard as i probably made it sound. good luck!!!!
These motors have a fuse incorporated in the field winding and it sounds like that blew. These motors sometimes overheat at the front bearing and the bearing will melt into the plastic housing. This will cause the fuse to blow. It sounds like that's your problem. You can remove the motor by removing the three screws on the bottom of the powerhead and then check the front bearing for any bubbling or blistering in the plastic housing. The shaft of the motor should turn easily.