Fix G60 Hub Motor! Loose Magnets Scraping. JBWeld HighHeat

[@Huxleybluehair]

Just wanna 🎉❤ give love to the OP. I have a blackhawk pro 3 electric skateboard and had a weird tappin and jankiness, resistance to one hub motor. Loose magnets it was.. After watching this.. i used regular jb weld before replacing the magnets one by one to ensure no issues. And even replaced the allen hex cap bolts with Torx cap bolts for better traction. So chuffed shes back up n runnin! :) saved me a few pennies. But caused a few grey hairs 😂

[@jonasmeier417]

Dear E-BikeBuilder: Thank you for this video! You are skilled, you have and bought tools - and is still complicated and not easy. The thing with the magnets shouldn't be, put happens quite often. How is normal consumer dealing with that? Is there no warranty? E-Bike stuff does not last long enough. It should be guaranteed that an e-motor should last for example 50'000 miles or even more. If issues like these would be with cars, it would be a scandal!

[@EBikeBuilder_]

To be fair- the motor is 48v / 750w, and i have it on 72v / 2000w😜 But yes you are correct, i have seen loose magnets with stock setups. Ebikes have a wide range of quality control Lol some are very good and some are bad. I bought an Aventon bike, and they have good warranty and support- they gave me a new battery when some wires melted on a hot day. But yes i have heard many bad stories about ebike manufacturers not honoring warranties, even US ebike companies such Rad Power bikes seem to be struggling to meet customer support needs. If buying a Chinese ebike from a smaller manufacturer, i wouldn’t expect any kind of warranty support. When i buy motors or anything on Ali Express, i don’t expect any warranty or support and probably no returns either. It’s unfortunate but that’s just how it is at the moment. In this case BAFANG manufactures the motors, but they only sell them through distributors, who sell them to manufacturers of ebikes, etc. Bafang has no control over what distributors and manufacturers do with the motors. So in general if you want an ebike warranty it must be from a reputable ebike manufacturer in you country , that isn’t going to go bankrupt. When buying motor kits, the distributors are less likely to provide warranty support for DIY customers. There would be a burden of proof to prove the warranty claim was not due to user error. But yes ebikes break down often and have many issues. there will be a great demand for servicing and repairing them. 👨‍🔧 i hope to demonstrate that its not too difficult to fix these problems 👍🙌 If there’s a will, there’s a way 🙏👍

[@jasonkrantz8946]

Also a car cost 25000 ebike is about 2200? So warranty means way more money

[@patprop74]

23:10 you seem to be missing a few hall effect sensor magnets on the wire side face plate.

[@EBikeBuilder_]

Lol wow 😯 didnt realize that. My dual motor setup uses the rear hub as the primary speed sensor. I actually don’t know if my speedometer for that front hub ever worked right, That’s probably why Lol 😂 I don’t remember ever seeing them loose anywhere, i wonder what happened. Good eye! 👀

[@counter929]

Looks like im about to be in the same boat. Pushed my motor to hard and heard that same noise, thought it was my planetary gears, and then noticed a magnet sunk/ at regular height compared to entire magnet line up. Will definitely give this a watch more than once, thabk you for the info and process

[@EBikeBuilder_]

the JB weld worked fine to hold the magnets in, make sure to wipe off the top of the magnets as the air gap between rotor and stator is small and you dont want JB weld scraping. In my case I think i screwed up my entire rotor with the gear puller on accident is why I had to get rid of that rotor. But the JB weld was working. I dont think those magnets have ANY adhesive on them by default BTW, i think they just stick to the metal of that rotor shell. But if you use too much power on the motor or if they get hot , it seems like they can slip around and come loose

[@counter929]

@@EBikeBuilder_ I wish I had taken a picture when I pulled my motor apart, there looked to be some kind of volcanized rubber/adhesive being pushed out of the space between the magnets. I'll have to keep an eye out while removing the rotor. This'll be fun project

[@EBikeBuilder_]

@@counter929 yeah I have an 8 inch gear puller from Menards and it was a little big and the jaws were a bit thick … be careful when using the gear puller make sure it’s jaws are only touching the rotor, and not anything else, and make sure its aligned straight, I’m not sure how i did it. But i totally jacked a rotor and bent it with the gear puller!! I had to use a grinder to grind down the legs of the 8” gear puller so they cleared the rest of the motor better. And now it works like a dream and no worries of damaging another rotor

[@counter929]

@@EBikeBuilder_ thank you for the info gonna be looking at my motor today after work

[@mr.mcmich8723]

Is there no way to see if the magnets loosened without taking the motor apart?

[@sarcastrophe6992]

bro ur killin me with taking off the snap-rings like they c-clips. open it with the pliers then slide up the shaft all the time keeping them open until its off the shaft

[@EBikeBuilder_]

@@sarcastrophe6992 1st time for everything

[@sarcastrophe6992]

@@EBikeBuilder_ amen to thative got a 1000w bafang ive been dumping 65 amps into i got new steel gears coming. it will be my first

[@davidvasquez3564]

I believe these magnets are called earth magnets they are very strong, and they are all the same in the hub. The blue and red marking is only to place in opposite polarity to each other, for example when you'll stick them together side by side it comes together but if you turn them around it won't.

[@jjung2005]

Dude, you are funny! I love it. Subscribed!

[@nicod974]

It's not the magnets that are lose... It's expansion of stator due to heat during operation. A good quality motor shouldn't expand, unless you push to much power into it. Retight spokes after a hard ride, maybe true it too. By the look of that rotor, I can tell it has been rebuilt already because the magnets used are straight, they should be '' rounded'' . Also before you reput magnets in, you should mesure each magnet pull strenght and rearrange accordingly...strongest north should oppose strongest south, and so on until the weakest, this will improve efficiency by fraction, but it's the way...

[@EBikeBuilder_]

I got the g60 motor on ali express, it seemed new 🤷‍♂️ the magnets were round on one side, and flat on the other side. I didn’t measure the strength of the magnets before reassembling, never thought of that. 🤔 thank you for The thoughtful comment i bet you’re right and Heat has affected the rotor.

[@jamesbrown5262]

I have a brand new ebike 300miles making grinding noise in the hub motor. It started the night after I rode it in a downpour and It fell to the ground hard when I lost ,my balance. Now every ride it will make that grinding noise and vibrate. I pull over and put on kickstand and run it for a minute and it goes away. What should I do? DIY open and check the magnets? Maybe the spokes as you mentioned, or maybe just water in case? Im trying to avoid spending 200-300 on new motor.

[@dg9bfc]

you can increase cooling of geared motors if you add some atf fluid or similar oil into it... that splashing around oil transports the heat to the outer case

[@rickc2222]

JB weld high heat 550F / 288C JB weld Original 550F / 288C JB KwikWeld: 250F / 120C JB MarineWeld: 550F / 288 C JB ClearWeld: 250F / 120C Permatex 500 High Heat Epoxy 500F / 260C So if original JB weld is rated for same temperature range, any reason not to use it?

[@EBikeBuilder_]

No Idea, Good point, didnt realize that

[@maximumchargeEV]

This came up on my feed. Straight PTSD.

[@EBikeBuilder_]

lmao that motor is still kicking some how . Its seen some shyt

[@EBikeBuilder_]

your video helped me verify wht size gear puller i needed when I was at the hardware store. Lol 🙏

[@maximumchargeEV]

@@EBikeBuilder_ the BFGP

[@stevensexton47]

Did all that hard work pay off? Are you back on the road?

[@EBikeBuilder_]

@@stevensexton47 yeah it worked for a while, until i bent the entire rotor with the gear puller on accident. ended up buying a new rotor for 50$

[@marcosramos4596]

How many hours did it take to finish from start to finish?

[@EBikeBuilder_]

ohh on this G60 hub motor im not sure about how long, its pretty easy probably easier than the BBS02. that i had to take apart the other day. Cuz i have a jaw puller for the gears on the hub motor. IDK how to pull that 02 rotor without some mac guyvering

[@marcosramos4596]

It helps when you use the proper tool to remove those C-Clamps!

[@EBikeBuilder_]

I used a Retaining ring plyers , what shall i use? I’ll have to check it. Those things are annoying i need to buy some

[@marcosramos4596]

@@EBikeBuilder_ I forgot what they're called but I have some pliers built only for C-Clamps. I bought them at an Auto Parts.

[@EBikeBuilder_]

@@marcosramos4596 oh sorry i DID use a normal plyers in this one, you’re right, i bent that clip. I just did this yesterday on the 02 i thought this comment was on a different video!!

[@WatWatppt]

Hi!.. broken magnet . Where can I buy it?...what size ....mm

[@EBikeBuilder_]

I’ve never bought just the magnets but maybe search ali express for bafang hub motor magnets, there are probably different sizes for 500w / 750w / vs 1000w etc. they are curved magnets , not exactly straight. An entire new rotor is only 50$

[@TK-OK]

“Freedom temperature units” 👍 They’re trying to take it

[@int53185]

This happens with the bbshd. I bought a new stator and rotor assembly.

[@EBikeBuilder_]

Were you using the stock BBSHD controller? Never had that happen with mine. Interesting 🧐

[@BillBadMule123]

[@gauravjoshi9183]

You operating this motor at 72v?😮

[@EBikeBuilder_]

Yeah

[@debohannan4315]

I think all of these motors just have press fit magnets

[@EBikeBuilder_]

Yeah the rotor that whole metal chunk is magnetic. The magnets grab onto it. and I think under normal operational circumstances and heat and magnetic force, should be OK, but I was running it on 72V with a phaserunner. and like 2000W on a 750w g60. So Iunno i think the rotor must have got too hot. I have ran my G62 motor the 1000w variant much harder and never had any problems like with this g60. So i believe the g62 is a big improvement over the g60. ANd I have an FM.G61.1000W which is the new iteration of the front motor. I keep meaning to do a video on that motor and look inside.

[@luckyluke4435]

👍

[@marcosramos4596]

You bent that clip 📎

[@EBikeBuilder_]

Yeah. that clip i definitely bent with the plyers LOl I think it was making some noise. but it eventually went away

[@EBikeBuilder_]

on this g60 motor i ended up havig to buy a new rotor for 50 bucks on ebay, eventually that rotor went out of tolerance, I mgiht have jacked it sideways with the gear puller, or idk it deformed from heat or something. The G62 can handle a LOT MORE than the g60

[@rjshhooba9857]

same here , its sounds like brrrrrrrrrrrbrrrrrrbrrrrbrbrbrrbrbrrrbrbrbrrrrrbrbrbrrrrbrb

[@stevenmcc6052]

Take it to a shop buddy

[@EBikeBuilder_]

I am the shop

[@jasonkrantz8946]

German torque good and tight lol

[@brucethomas3929]

😂