My Gotway Monster 100v committed suicide today and it was all my lack of maintenance fault.

[hyperair]

2 hours ago, Peter Q said:

Can anyone please tell me where I can buy one of that special 24mm socket which can use on the Monster? Or maybe someone can help me to make one, and I will pay you back.

Thanks.

Peter Q

This might work: https://www.aliexpress.com/item/32905014845.html?spm=a2g0o.productlist.0.0.4573b3dcSspMF5&algo_pvid=433e8a97-c882-42de-8d3f-e129f202c5d8&algo_expid=433e8a97-c882-42de-8d3f-e129f202c5d8-4&btsid=1e0c7cdc-d1d4-4413-8f2b-232fbcfbe343&ws_ab_test=searchweb0_0,searchweb201602_8,searchweb201603_55

Or this: https://www.amazon.com/Metric-Spanner-Tubular-24mm-27mm-Fitting/dp/B07WDQ4K2T

Edited December 10, 2019 by hyperair

[Aneta]

It's a terrible design for sure. The pedal hanger will always try to wiggle the nut out by alternating loads. (imagine you needed to unscrew a rusted nut - you'd do similar wiggle to loosen the nut) Loctite won't help for long, since this wiggle will start turning it into powder.

Attachment with nut is only reasonable if we had a proper structural inverted U connecting the hangers over the tire (just like a fork on a bicycle).

Facepalm got way, facepalm!

[Marty Backe]

5 hours ago, Peter Q said:

Can anyone please tell me where I can buy one of that special 24mm socket which can use on the Monster? Or maybe someone can help me to make one, and I will pay you back.

Thanks.

Peter Q

You can borrow mine

[Marty Backe]

6 hours ago, Rehab1 said:

Or at a minimum drill tap a hole in the hanger and add a set screw to impale the nut. 

 

 

Very cool idea. I don't think it's a complete fix because the axle nuts also get loose because the shims themselves get distorted over time, causing everything to get loose.

[Peter Q]

1 hour ago, Marty Backe said:

You can borrow mine

Thank you so much Marty, will ask you to borrow that when the time come, I am now waiting for a V3 84v 2400wh delivery from eWheels, should be on Tuesday or Wednesday.

Peter Q

[Rehab1]

9 hours ago, Peter Q said:

Can anyone please tell me where I can buy one of that special 24mm socket which can use on the Monster? Or maybe someone can help me to make one, and I will pay you back.

Thanks.

Peter Q

I sent you a PM.
 

Here are a few photos of the fabrication process:

First cut some slots in the socket using a metal cut off wheel or die grinder (I believe the final cut was 5/8 x 1 1/2” ). 

Clean up the slots with a die grinder.

Whala! The finished product. 

 

Edited December 10, 2019 by Rehab1

[Planemo]

4 hours ago, Rehab1 said:

Whala! The finished product. 

100 bonus points for spelling 'voila' in the most entertaining and original way I have seen yet 

 

[Rehab1]

17 minutes ago, Planemo said:

100 bonus points for spelling 'voila' in the most entertaining and original way I have seen yet 

 

 I looked this up in the dictionary and had to laugh. I highlighted the second paragraph. Yep... that’s me! 

whala

a bastardized english version of the French word "voila" meaning "there it is" 

Often used by morons in an attempt to sound more intelligent than they actually are. 

[Marty Backe]

3 hours ago, Rehab1 said:

 I looked this up in the dictionary and had to laugh. I highlighted the second paragraph. Yep... that’s me! 

whala

a bastardized english version of the French word "voila" meaning "there it is" 

Often used by morons in an attempt to sound more intelligent than they actually are. 

LOL. Yep, you "bastardized" it. So typical 

[n2eus]

17 hours ago, Peter Q said:

Can anyone please tell me where I can buy one of that special 24mm socket which can use on the Monster? Or maybe someone can help me to make one, and I will pay you back.

Thanks.

Peter Q

Here's what I use:

https://www.amazon.com/dp/B000UZ0R08?psc=1&ref=ppx_pop_dt_b_product_details

Just requires disconnecting motor wires, which is easier for me than fabricating a notched socket.

[Rehab1]

3 hours ago, Marty Backe said:

LOL. Yep, you "bastardized" it. So typical 

 I thought for sure you would concur with the  ‘Moron’ comparison.

[Marty Backe]

3 minutes ago, Rehab1 said:

 I thought for sure you would concur with the  ‘Moron’ comparison.

I figured I'd be nice and call you a bastard instead 

[Rehab1]

2 hours ago, Marty Backe said:

I figured I'd be nice and call you a bastard instead 

My wife would buy you beer. 

[Mrd777]

Thanks for this post @chulander!
I immediately bought a 24mm socket and made a slot with a grinder. I used the work mate table (thanks @Marty Backe) and used a long pipe for leverage, which really helps. I applied red thread locker too. I was able to move the nut quite a bit. I had no slop on the pedal arm, however I took your post to heart.

Thanks,

mark

[Marty Backe]

1 hour ago, Mrd777 said:

Thanks for this post @chulander!
I immediately bought a 24mm socket and made a slot with a grinder. I used the work mate table (thanks @Marty Backe) and used a long pipe for leverage, which really helps. I applied red thread locker too. I was able to move the nut quite a bit. I had no slop on the pedal arm, however I took your post to heart.

Thanks,

mark

Except for the 10-foot lever arm  that's what I do 

[Rehab1]

2 hours ago, Mrd777 said:

used a long pipe for leverage,

Your Mten 3 sitting on the floor sounds concerned.

 

 

[Marty Backe]

30 minutes ago, Rehab1 said:

Your Mten 3 sitting on the floor sounds concerned.

 

 

LOL

[chulander]

6 hours ago, Mrd777 said:

Thanks for this post @chulander!
I immediately bought a 24mm socket and made a slot with a grinder. I used the work mate table (thanks @Marty Backe) and used a long pipe for leverage, which really helps. I applied red thread locker too. I was able to move the nut quite a bit. I had no slop on the pedal arm, however I took your post to heart.

Thanks,

mark

Glad I could save another monster from taking off by itself 

[houseofjob]

On 12/9/2019 at 9:36 PM, hyperair said:

Another thing is that none of the other vendors using the wheel nut system have wheels above 16" in diameter (I think), and the torque requirements on the axle go up linearly with an increasing wheel size. It might simply be that this system fails on wheels with larger torque requirements, or that the wheel nut needs to be installed with more torque on these larger wheels.

Exactly this.

FWIW, Gotway 16's & below do not experience such axle nut un-tightening, and from what I can tell, this issue is very rare for even the 18's in the MSX of late (although I've seen a very minority wheels having this issue). No one else makes a 22" to compare against.

Playing devil's advocate, the few recent v2 Monsters I've re-tightened the axle nut (mine and others), there wasn't nearly enough threadlocker applied IMHO.

 

On 12/9/2019 at 9:36 PM, hyperair said:

Also, did Gotway increase their axle size? I suspect that an increase in thread size requires a corresponding increase in nut tightening torque.

I wanna say the Monster was always 24mm, even v1 (not 100% on that).

More recent wheels like the MCM5, MSX, Nikola are all 24mm. Everything else before that I believe is 20mm.

[Marty Backe]

2 hours ago, houseofjob said:

Exactly this.

FWIW, Gotway 16's & below do not experience such axle nut un-tightening, and from what I can tell, this issue is very rare for even the 18's in the MSX of late (although I've seen a very minority wheels having this issue). No one else makes a 22" to compare against.

Playing devil's advocate, the few recent v2 Monsters I've re-tightened the axle nut (mine and others), there wasn't nearly enough threadlocker applied IMHO.

 

I wanna say the Monster was always 24mm, even v1 (not 100% on that).

More recent wheels like the MCM5, MSX, Nikola are all 24mm. Everything else before that I believe is 20mm.

I have seen ACM's (16-inch) with horribly loose axle nuts and/or distorted shims. But yes, it's seen much less on all other wheels than the Monster.

You're correct that the Monster was the first wheel with the 24mm axle. All the other Gotway wheels had 21mm axles. The Tesla (mid-2017) was the first non-Monster wheel with a 24mm axle. And these values are actually the size of the nut, not the axle, BTW 

[xorbe]

What about using "safety wiring" like motorcycle racers do?  It's to 100% keep their oil filter and drain plug from turning, because oil on a track is a nightmare.

[Ben Kim]

i apply a straight line of loctite red across the north and south end of the nut threads and hand tighten as hard as i can. It’s been successful for me. 

[houseofjob]

4 hours ago, Marty Backe said:

And these values are actually the size of the nut, not the axle, BTW 

Tomatoe, tomatoe 🤷‍♂️

[Aneta]

7 hours ago, Marty Backe said:

You're correct that the Monster was the first wheel with the 24mm axle. All the other Gotway wheels had 21mm axles. The Tesla (mid-2017) was the first non-Monster wheel with a 24mm axle. And these values are actually the size of the nut, not the axle, BTW 

What's the diameter of the axle?

[Marty Backe]

36 minutes ago, Aneta said:

What's the diameter of the axle?

I have no idea. There's probably a lookup table that will give you the inner diameter for a typical 24mm nut.