This is a standing vornado fan with full variable speed control. The blade assembly (looks like one piece) slides from one end to the other of the shaft about a 1/2 inch to an inch. More accurately put, the shaft slides in and out of the motor about that much. The fan always makes a vibrating noise unless tilted up so the fan blades are slid down towards the motor.
Any suggestions on how to take out the slack or whatever the problem is?
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Re: blade is loose
On the inner part of the motor [fan side] look for an external snap ring and a fiber spacer. the armature fits all the way into the rear part of the housing, the other housing goes over the motor shaft and must press against the snap ring and fiber washer.
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Does the motor spin, but the blade is not turning?
The motor has a D shaped shaft. If the hole in the blade that the shaft goes in is rounded, then the blade will spin. In that case you need a new blade. Vornado can supply that.
you can try and oil it, unplug it and begin taking it apart, your destination is the fan motor, dust around the motor and I would recommend using regular automotive 10w30 motor oil on that motor, put some in a small bowl and use a small baster or equivalent and oil around both ends of the motor shaft(where it protrudes from the motor) behind the fan blades and behind it, look closely with a flashlight where the motor attatches to the back guard. try get some oil in there and within the motor housing to the inner bearing areas if possible. My guess is that its sealed from the factory, but you can try, those fans are the best on the market and have a long warranty, heres a link to the manual http://www.vornado.com/manuals/allcirc.pdf
I wrote to a person earlier about oiling one, now Im thinking she may be having the same problem you have, I will paste that info at the bottom, but sounds like your fan blade assembly has come loose and/or worked its way back down to the motor, study the fan blade assembly and look for an allen bolt or ring holding the assembly to the shaft, remove the ring or loosen the allen bolt , adjust the fan blade assembly so it doesent bind, oil the motor with regular 10w40 motor oil and dust the fan, these are good little fans and that company has been making those since the40's, also sending user guide link. http://www.vornado.com/manuals/allcirc.pdf