New whine grind sound avinox motor

[prolix2]

Four month old Am flow pro with 500 miles. In the last 200 miles increasing grind whine sound which I will try to attach some videos of. Occurs with any peddling at any speed with any power mode, and in any gear. Am Flow Support had me make videos of turning the crank, with the chain off and power on which produces the sound. Turning the crank with chain off and power off does not make the sound.. There is no effect on performance. I cannot detect any looseness of the bottom bracket or crank or motor mounts. The people at Allo Support Saturday afternoon say they will ask their tech staff about it and they also say they've never seen this particular problem. I don't find anything searching online with AI that matches a specific sound either. As you can see in the video the sound occurs as long as they're overrun is operating, and of course stops once overrun is completed. I have my setting at medium overrun this is similar to the sound that track with the TQ motor had which was something that occurred with 10 or 15% of power output of the TQ motor and which TQ acknowledged was in complete engagement of the Sprags , and which TQ says officially that it does not affect performance or durability and is merely a sound problem.

 

[prolix2]

If I can succeed in attaching the video file of the sound I will ask if anybody else has experienced similar

 

[prolix2]

Four month old Am flow pro with 500 miles. In the last 200 miles increasing grind whine sound which I will try to attach some videos of. Occurs with any peddling at any speed with any power mode, and in any gear. Am Flow Support had me make videos of turning the crank, with the chain off and power on which produces the sound. Turning the crank with chain off and power off does not make the sound.. There is no effect on performance. I cannot detect any looseness of the bottom bracket or crank or motor mounts. The people at Allo Support Saturday afternoon say they will ask their tech staff about it and they also say they've never seen this particular problem. I don't find anything searching online with AI that matches a specific sound either. As you can see in the video the sound occurs as long as they're overrun is operating, and of course stops once overrun is completed. I have my setting at medium overrun this is similar to the sound that track with the TQ motor had which was something that occurred with 10 or 15% of power output of the TQ motor and which TQ acknowledged was in complete engagement of the Sprags , and which TQ says officially that it does not affect performance or durability and is merely a sound problem.

iCloud Photos - Apple iCloud. I am hoping this is the link to the video of the sound

 

[prolix2]

I hope this is a video of the motor sound

 

[Gauss Guzzler]

Yeah that's dead. The high frequency suggests that it's a problem with the first gear stage or the motor. I'd bet that it's almost impossible to turn the chainring backwards by hand (though it's normally quite difficult).

 

[prolix2]

Good thoughts. I'll try and see if I can turn the chain ring backwards. I'm not familiar with how difficult it is to do under normal circumstances though. Where is the first gear stage you're talking about?

 

[prolix2]

Good thoughts. I'll try and see if I can turn the chain ring backwards. I'm not familiar with how difficult it is to do under normal circumstances though. Where is the first gear stage you're talking about?

View attachment 174485

I wonder if one of the plastic planetary gears is disintegrating

 

[prolix2]

I wonder if one of the plastic planetary gears is disintegrating

Turning the chain ring backward has minimal moderate resistance as usual, and makes the usual sounds of a geared motor running backward

 

[prolix2]

Turning the chain ring backward has minimal moderate resistance as usual, and makes the usual sounds of a geared motor running backward

Which would mean that it's not locked by some completely disintegrated gear?

 

[prolix2]

AmFlow says the sound is normal, and that the motor internally is OK. They recommend greasing the Spine, which they call motor spline. This seems to be some kind of clutching mechanism with teeth on the outside of the motor spline and teeth on the inside of the chain ring. I'm guessing it may allow backslip in One Direction and locks like sprags in the other direction, and I could see if there were not enough grease, it might be noisy? The picture is from a tutorial they sent and the creamy yellow stuff around the periphery of the teeth is newly added grease. It looks like a heck of a lot of grease. Incidentally the grease has to be ordered from the UK or Australia and the specific spline removal tool also has to come from Europe and Am Flow says they are out of them until February. At this point I'm impressed with Am Flow's responsiveness. Their support line seems to be in pretty good contact, and in a timely manner, with their tech team , even Saturday night.

 

[prolix2]

Amflow online said to re-grease the motor spline. I'll try to attach a picture. The creamy yellow stuff around the outside of the teeth is the special grease they recommend. I squirted a little oil today into where it's supposed to be and it seemed to help the noise..

 

[prolix2]

What the Amflow dealer found when they looked at the motor line. It was almost no grease there to begin with.. The teeth around the periphery of the " motor spline" do not move against any other gears. The internal teeth of the spider merely engage them. The dealer packed the grease has shown in the photo sent by Amflow "internal engineering team". The packing made no difference in the sound. I can't believe anybody would expect it to, unless they were naïvely thinking that somehow the packing would stop internal sounds from getting out. Awaiting to hear back from amFlow. I'll try to post videos of my sound on my Am Flow compared to normal Am flow in the shop. Please keep in mind that the phone video tends to increase a low sound in order to make it audible in the video. I fallen also tends to diminish a loud sound in order to bring it into an acceptable range as well. In other words the difference between the two bikes as much more than the video would illustrate.

 

[prolix2]

Yeah that's dead. The high frequency suggests that it's a problem with the first gear stage or the motor. I'd bet that it's almost impossible to turn the chainring backwards by hand (though it's normally quite difficult).

Just tested my bike today against one at the shop I took it too. When you walk my bike backward, which turns the chain ring backward it makes the same high-pitched whirring sound as it does when the motor is on and the crank is turned forward. When we walked a new bike backward, one on the shop floor, with power on , it doesn't make any sound at all, as if the motor is not even turning backward internally. It appears that when you crank my crank backward it sounds like the internal motor is turning passively. Also today the shop packed grease around the motor spline, as recommended by Amflow's "internal engineering team'" , and it had no effect in reducing the sound noise . The new amflow on the shop floor was as quiet as mine was originally.

 

[EBMR eBike Motorreparatur]

Just tested my bike today against one at the shop I took it too. When you walk my bike backward, which turns the chain ring backward it makes the same high-pitched whirring sound as it does when the motor is on and the crank is turned forward. When we walked a new bike backward, one on the shop floor, with power on , it doesn't make any sound at all, as if the motor is not even turning backward internally. It appears that when you crank my crank backward it sounds like the internal motor is turning passively. Also today the shop packed grease around the motor spline, as recommended by Amflow's "internal engineering team'" , and it had no effect in reducing the sound noise . The new amflow on the shop floor was as quiet as mine was originally.

That type of testing (pushing bike backwards) on EBikes with Brose Drive units shows signs of problems with the planetery gears

 

[Hoverp]

Following closely, thank you for doing detailed posts and pictures we can all benefit from..

 

[prolix2]

That type of testing (pushing bike backwards) on EBikes with Brose Drive units shows signs of problems with the planetery gears

Yes when I run my bike backward it makes the whine grind sound. Other bikes I've tried to not make that sound.

 

[prolix2]

Following closely, thank you for doing detailed posts and pictures we can all benefit from..

After my dealer interacted with Am Flow online support they are having a representative contact him and I believe the representative has said they're going to send a new motor. After being convinced that it is an internal motor problem. The dealer is going to ask permission to take apart the old motor so that we might see what the problem was.

 

[EBMR eBike Motorreparatur]

After my dealer interacted with Am Flow online support they are having a representative contact him and I believe the representative has said they're going to send a new motor. After being convinced that it is an internal motor problem. The dealer is going to ask permission to take apart the old motor so that we might see what the problem was.

This would be a little miracale if they agree that any workshops opens a defective drive unit which was exchanged in the warranty period

 

[prolix2]

This would be a little miracale if they agree that any workshops opens a defective drive unit which was exchanged in the warranty period

AmFlow did send a new motor and shop installed. Perfectly quiet and works perfectly. AmFlow was not allowed in the local bike shop to look inside the motor.

 

[ozzybmx]

AmFlow did send a new motor and shop installed. Perfectly quiet and works perfectly. AmFlow was not allowed in the local bike shop to look inside the motor.

Good result.