Leopard 3674 Bearings

[Fluid]

I haven't opened my new Leopard 3674s, what size bearing is required for replacement. I assume the bearings for a 540 Feigao would work - but someone must know the specifics. Thanks!


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[Fluid]

Anyone? Bueller? Anyone?





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[Jeff Wohlt]

Do you not have a digi mic gauge? Would have thought someone would know but sorry I do not. I have some of those coming but can't answer you yet.

[Alexgar]

there is a part number on most bearings, type it here and they are pretty cheap
http://www.vxb.com/ballbearings.html?gclid=CLGo1_WTkKcCFQHs7QodPGlKdA

[Fluid]

I have plenty of precision measuring devices but they do me no good unless I open the motor and remove a bearing to measure. No part numbers are visible from the outside of the motor. If no one knows the size then I'll have to open the motor, which I really didn't want to do until I have the bearings. Opening the motor flat-spots the rear bearing and ruins it so the motor can't be run until I have new bearings. Thanks for the help guys! :thumbup1:



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[ray schrauwen]

Hey, chill...

They bearings in the 4074 motors are just fine and don't need upgrading. What makes you think the 3674 motors need upgraded bearings?

Most likely the same as the 4074 motors, 5mm x 16mm x 5mm but, I'm not 100% sure.

Why not run it the way it is?

[AlanN]

Hey Jay,
Sounds like you had better just get out the can opener!

Guys, Jay knows what he is doing. He just wanted a direct answer. He's prob looking to replace them with a higher grade for saws or just cuz that's how he wants it.

[m4a1usr]

Most likely the same as the 4074 motors, 5mm x 16mm x 5mm but, I'm not 100% sure.


Most of the 540 cans use 5 x 11 x 5mm size bearings. Thats what I have found with the Nemesis, Hacker, Feigao and Keda's over the years. But I dont own any Leopard 36mm cans so I cant say with any confidence.

John

[Himalaya]

Leopard used 5x13mm bearings in the earlier batches of their 36 and 40 series motors. They then just decided to go bigger to 5x16mm. Now sure what revision you got so you may have to open it to have a look. 3mm is quite some diff in appearance, pretty easy to tell even by naked eyes.

[ray schrauwen]

I was guessing on bearing size Mr. Himalaya, just to let you know...

[Fluid]

Leopard used 5x13mm bearings in the earlier batches of their 36 and 40 series motors. They then just decided to go bigger to 5x16mm.

Thanks guys, looks like the can opener it is! :bash:




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[norbique]

can someone tell me what's the proper procedure to open up a leopard motor?
I unscrewed the 3 screws, but the endbell is still rock solid on. Do I have to hammer it out? :) :help:

[ray schrauwen]

On a solid piece of hardwood on a table you should be able to carefully tap the motor shaft on the wood with the motor in hand to break the press fit or light CA glue. One seal is ajar, tap lighter until the end pops out of the case.

[norbique]

Thanks I succeded taking it apart in the meantime. Did a bit differently though. I held the motor in hand, but used a copper hammer to hit the shaft and it worked.
Next question: where do you get your replacement bearings from? And is the ceramic bearing hype worth the extra $$?

[ray schrauwen]

I buy my bearings and bearings for a buddy from a local guy. He's older and crusty and says "go ahead and spend extra on them if you want but, these are better in the long run...." I think I paid $10 each for some Japanese VXB bearings.

Thats thats pretty much all he sells is bearings.

If they were that great maybe Lehner after decades would be putting them in their motors. Wish I could get some of those bearings easy...

[martin]

Fluid im 99% sure the bearings in the 3674 motor are the same bearings they use in the 40 series leopards, those are 5mm id x 16mm od x 5mm wide. These are standard size 625 2z or zz depending on manufacturers spec, chrome steel bearings with 2 metal shields. The 2z or zz is 2 metal shields, if you want ceramics their still a 625 bearing but with diff spec numbers.

[MassiveOverkill]

Thanks I succeded taking it apart in the meantime. Did a bit differently though. I held the motor in hand, but used a copper hammer to hit the shaft and it worked.
Next question: where do you get your replacement bearings from? And is the ceramic bearing hype worth the extra $$?

I'm sold on ceramic bearings. I've run my motor for a good 3 weeks in an overheated condition (early on it was hot enough that smoke was coming off the coils a few times) and the Boca Ceramics I used didn't skip a beat. This is on a 3300KV motor on 3S. The motor was even run with a vibration problem for a few runs as well.

I say their worth their weight in gold in my experience.

[jkr]

The bearrings are both 5x11x5mm.
I always change mine with ceramics

[martin]

Apologies yes it looks like its the older 36series motors that had 5 x 16 x 5mm, & the current ones now use 5 x 11 x 5mm.

[G-UNIT]

My leopard 3674 1900kv motor has 5x11x5mm bearings in it.
this was checked by a bearing store but they did not and could not get them so I stoped by my lhs which I should have done in the first place and found some from thunder tiger, part number pv0059.
the package says high peformance. these were in the heli dept.
I will install them tonight or tommorrow and let you know how they work.
the price was 6.99 for two.

[G-UNIT]

Well I installed the new bearing in the 3674 1900kv leopard motor and everything seems fine, the motor spins ok with little noise, not as quiet as the orginal but you can tell its not bad.
this was the first time doing this and it was a piece of cake.

[4343]

g-unit, I sunk my leopard 3674 1650 kv motor, I took out the bearings to replace, but lost a brass spacer, can you tell me what side the thicker ones goes and the 2 thin ones??

[4343]

I sunk my leopard 3674 1650 kv motor, I took out the bearings to replace, but lost a brass spacer, can you tell me what side the thicker ones goes and the 2 thin ones??