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If the fan motor will not turn on or hums and/or turns slowly more than likely its a lubrication problem.
1. Unplug the fan from the wall remove the 516 screws to the cage
2. Try turning the fan blade by hand if it is tough to turn more than likely it's a lubrication problem
3. You will have two oil holes one in the front one in the back spray WD-40 into these holes, turn the fan blade if it starts to free it up apply more WD-40 and keep turning the blade add more WD-40 until the blade turns freely. Especially in the rear oil hole because this is an oiled bushing that you are adding oil to. Once the fan is turning freely replace the front cage with all the screws plug the fan and I hope this solves your problem. You may add 3 in 1 oil or some other very light lubricating oil periodically.
try cleaning it and put oil especially at the base of the shaft.then try wiggling the shaft for bushing tolerance.if you feel the shaft wiggles to wide, then you'll need to replace the bushing and the shaft.but before anything else check the thermal fuse.it is found on the motor itself or try to borrow a tester with resistance measurement to check for continuity of the winding by connecting the probes with the plug, one each terminal.then turn the fan on.the pointer should move if its ok, unless burn out.if not.then the thermal fuse blow-out.
Probably requires cleaning- take the grille off, pull the blade free (most pull straight out- some have a pin/socket deal right behind the blades that need to be removed first) and clean out any gunk you may find inside. Be sure to unplug it first.
before replacing the blade, turn the shaft with your hands to see how it moves; you might want to grease it with an electricity friendly lube of your choice.
If it's still hard to turn, it may just be this fans time; box fans are cheap, and made cheap, and the wear-and-tear adds up.