andre194188
1 µW
Hello everyone, This is my first post here. I am from Sweden and have used an e bike with a bafang/8fun rear mounted motor for a few years now. Heavy usage and harsh winters have taken their toll and the motor has finally given up the ghost( it made a rough rattling noise and then stalled entirely). Anyway the bike store suggested that I replace the whole wheel or just the motor drive assembly alone which would cost between 250 to 300 USD. I declined this since I figured that I could probably repair it myself for way less than that.
After looking around I found that the hub is probably a 250W 8Fun SWXH although im not 100% certain. The problem appeared to be that the nylon planet gears wore down. This is an easy fix since it involves just replacing the gears but I also found that the motor runs quite roughly when spun up just by itself.
The reason for the roughness is probably that the internal bearing(the bearing between the stator and rotor) must be worn down or has clogged up with gunk and pieces of the planet gears.
I have googled around but I cant figure out how to remove the stator from the rotor so I can access the main bearing.
In the exploded view it seems like I have to remove a spring cotter and the three screws to remove the sun gear which will then allow me to remove the second cotter spring and the key which should then free up the rotor from the shaft.
However I cant seem to get the spring cotter out. I have tried to squeeze and remove it with some needle pliers but I dont really see how it slides off the shaft.
I guess the ideal solution might be to make the motor run smooth without opening it. Can I clean the motor with WD 40 or similar and then try to pack the bearing with grease? Sorry if that sounds like a noob question but then again thats exactly what I am
Your help will be very much appreciated!
After looking around I found that the hub is probably a 250W 8Fun SWXH although im not 100% certain. The problem appeared to be that the nylon planet gears wore down. This is an easy fix since it involves just replacing the gears but I also found that the motor runs quite roughly when spun up just by itself.
The reason for the roughness is probably that the internal bearing(the bearing between the stator and rotor) must be worn down or has clogged up with gunk and pieces of the planet gears.
I have googled around but I cant figure out how to remove the stator from the rotor so I can access the main bearing.
In the exploded view it seems like I have to remove a spring cotter and the three screws to remove the sun gear which will then allow me to remove the second cotter spring and the key which should then free up the rotor from the shaft.
However I cant seem to get the spring cotter out. I have tried to squeeze and remove it with some needle pliers but I dont really see how it slides off the shaft.
I guess the ideal solution might be to make the motor run smooth without opening it. Can I clean the motor with WD 40 or similar and then try to pack the bearing with grease? Sorry if that sounds like a noob question but then again thats exactly what I am
Your help will be very much appreciated!