craio Posted December 12, 2018 Share Posted December 12, 2018 So since a week or two, my 67V ACM makes noise (not grinding) and vibrates the first couple of meters it's used and it seems to be getting worse. If i leave it standing there for some time this doesn't seem to make a difference (which made me rule out the capacitors). But did notice that if i put more weight on the right pedal it noticably worse. Already opened it up and the axle nuts seemed to be tight (not really easily reached with a wrench). The fact that it seems to stop after a while has me confused... Any ideas? Link to comment Share on other sites More sharing options...
Rywokast Posted December 12, 2018 Share Posted December 12, 2018 have you tried re calibrating it? would be a pretty simple first step to rule out Link to comment Share on other sites More sharing options...
craio Posted December 12, 2018 Author Share Posted December 12, 2018 26 minutes ago, Rywokast said: have you tried re calibrating it? would be a pretty simple first step to rule out Hm, didn't see the connection between levelling and the 'symptoms' but given that it solved the issue should have tried anyway. Thanks! Link to comment Share on other sites More sharing options...
Rywokast Posted December 12, 2018 Share Posted December 12, 2018 fantastic Link to comment Share on other sites More sharing options...
craio Posted December 12, 2018 Author Share Posted December 12, 2018 Given that I had it open and time anyway... Slightly abused ACM with a blue tire Why blue? Black wasn't in stock, ordered red, received blue with note that red was in error in inventory so they gave my the blue for free. Below how the old tire tread looks after 4500km (according to app). Link to comment Share on other sites More sharing options...
RockyTop Posted December 12, 2018 Share Posted December 12, 2018 This is just a guess. I have had the following happen with other pancake motors. It is possible that the motor bushing or bearing is worn. When you apply pressure the armature tips and rubs the fields or side of the motor housing. Link to comment Share on other sites More sharing options...
meepmeepmayer Posted December 12, 2018 Share Posted December 12, 2018 Make sure the board hasn't gotten loose. Usually that's what causes behavior like you described. You don't want your wheel to go crazy after a big bump that loosens the board further. Not sure why the recalibration solved the issue, but if it did... Link to comment Share on other sites More sharing options...
Dancer Posted December 12, 2018 Share Posted December 12, 2018 Maybe the screws holding the case to the pedal hangers have loosened. Link to comment Share on other sites More sharing options...
Marty Backe Posted December 12, 2018 Share Posted December 12, 2018 As @meepmeepmayer says, it's probably the control board. Make sure all four screws on the control board are tight. Even one semi-loose screw is enough to cause your symptoms. Usually the vibration goes away as the wheel travels faster, but it can be very noticeable at low speeds. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.