215S Air Circulator CR1-0065-04 Fan - Tips for writing user manuals

This fan is great. I've had it for 8-10 years. And now it has developed that problem I've had before with fans: The motor will hum but the blades do not turn easily. I have to jump start the blades. Can I do the repair or must I chuck the whole thing. It's a shame because of the quality of the fan. Can't I just replace the motor? And if so where can I get one?thank you