CVD'S are junk!!!!!

[gunnar]

Something I see,some companies build little CVD's/universal shafts for their trucks to gain steering. That is a known weak spot in any crawler....whatever the platform. A few different platforms can accept 1:8 scale CVD's. Those platforms can handle a TON more abuse and power than many on the market today.....and the CVD's/universals laugh at the abuse begging for more.

Crawlers NEED beef at the axles and joints...period. I'm not bashing Losi at all,the work they are doing is appreciated. This is just a thought since several platforms have issues with the axles/pins and stubs. Better,stronger material is a good idea,although it's not always better. To strong and brittle can be just as bad. Plain and simple....it's hard to beat BEEF!:lol:

Fully agree, A much larger joint needs to be used. 10+ broken AX10 CVD's and counting...

 

[BigSki]

so, just out of curiosity, what size are the tranny outputs and pinion gear? 5 mm? Might it possible to open up your bag of traxxas drive shafts and make up some temporary drive shafts to keep the rigs going? I'm just asking, I don't know if it would even work. I haven't even purchased a Losi rig yet. I had the box in my hands at the LHS and I got cold feet.

 

[Reflection]

so, just out of curiosity, what size are the tranny outputs and pinion gear? 5 mm? Might it possible to open up your bag of traxxas drive shafts and make up some temporary drive shafts to keep the rigs going? I'm just asking, I don't know if it would even work. I haven't even purchased a Losi rig yet. I had the box in my hands at the LHS and I got cold feet.

Axles/stubs...not driveshafts."thumbsup"

 

[themerc64]

Lubrication & Thread lock...

Do you guys realize that CVD's require lubrication to prevent failure. I know most guys skip the lube to keep the CVD from collecting dirt, but that's why you pull maintenance. MIP always supplied a clingy lube and thread lock with their old school CVD's.

 

[Crawlin4fun]

I don't think lube will keep them from breaking

 

[gunnar]

Do you guys realize that CVD's require lubrication to prevent failure. I know most guys skip the lube to keep the CVD from collecting dirt, but that's why you pull maintenance. MIP always supplied a clingy lube and thread lock with their old school CVD's.

Of course, but lube isn't going to make the axle stronger. Only material strength, size, and improved design will help. The lube is for the pin riding in the holes of the cup, the inner clyinder rotating, and the wear point at the neck of the ball and the edge of the cup.

 

[Reflection]

Do you guys realize that CVD's require lubrication to prevent failure. I know most guys skip the lube to keep the CVD from collecting dirt, but that's why you pull maintenance. MIP always supplied a clingy lube and thread lock with their old school CVD's.

99% of the broke axles I've seen,I really don't think it's a lube problem. It's a size problem IMO.

 

[1rcmonster]

Another broken cvd...

Here are a few pics of yet another broken cvd. I sure hope Losi is going to remedy the problem and help everyone out that has boughten a truck...

The ball is broken into 3 pieces and looking at it closely it seems as tho the shaft is pressed into the ball. Has anyone else noticed this? Look at the crosspin, no bends at all, therefor no load on the pin. It seems as tho it just exploded. Too bad we never got onto the rocks....

 

[Tad]

Looks like a heat treat problem. I am sure losi will take care of this issue. Just wondering if the trucks that are having trouble are around the same numbers.

No kit will ever be perfect when it comes out. Heck none of us would leave it alone even if it didn't break.

 

[TattooKenny]

Mine is kit #360 something..... Question is who has the highest #? How many rigs are out there now? 3000+? That's a LOT of CVD's to replace:shock:

 

[APESHAT]

THAT right there is some Carnage. .!

 

[dezfan]

You guys think the hardening process has anything to do w/ the failures?:?

 

[Slowkrawl]

You guys think the hardening process has anything to do w/ the failures?:?

Judging from the pictures, I would say it's more a material thickness problem. You can only make a "toothpick" so strong. However I don't have a broken one here to take a look at and get a better idea.

 

[Tad]

If the ball was just popping off it would be a to thickness problem but with the ball exploding it a temper or material problem.

 

[dezfan]

If the ball was just popping off it would be a to thickness problem but with the ball exploding it a temper or material problem.

That's what I was thinking as well.

 

[kikcaffine]

On mine it looked like the ball exploded off. Im 1000 something

 

[fwilly]

I broke one too. It held up to some crawling on the rocks, but I broke it playing around in the parking lot :roll: I also think the thickness of the materials has more to do with it. I think it would even be possible to build a stronger one without sacrificing turning angle. The CVDs can turn a little sharper than the knuckles will let them.

 

[Happy_trucker]

just out of curiosity, for the guys who had a CV break, were you guys spinning the wheel in a fast speed??? Like 1RCMONSTER said, his truck never touched rock, so did you held it in the air and just revved it???

 

[sniders1975]

How do you tell what # of kit you have??

 

[4XADICT]

How do you tell what # of kit you have??

Sticker on top of the tranny, were the dig servo mounts .

And I agree on thickness being the problem , though #510`s cvd`s held untill the back flips on carpet started . Sidewinder 5700kv on 3s .