Kraton 4s 2.5 front diff binding (after adding more oil and reassembly)

[Barmaleus]

Hi!

New to RC (not new to tinkering with stuff tho). Brand new K4s 2.5, never driven. While waiting for better weather decided to check diff fluids.

Took apart the front diff first. Added more diff oil (it was around half-full, strange). Put everything back together. Tightened the diff screws in X pattern to make sure they are aligned. Now, when I try to spin the diff, it goes smoothly most of the way, but then there are 2 spots where it gets "stuck".

Should I worry or it's fine as is? When I first took it out, I think it was spinning freely.

Thank you for any input.

 

[morrjr71]

It’s a common issue. You might have to back the yoke screws up just a bit. The real solution is Hot Racing aluminum diff yokes.

 

[Barmaleus]

@morrjr71 I see. By diff yokes you mean the black plastic housing consisting of two parts that holds the diff gears together?

 

[morrjr71]

@morrjr71 I see. By diff yokes you mean the black plastic housing consisting of two parts that holds the diff gears together?

Yes, those parts are the yoke. Here's a link to the Hot Racing aluminum yokes.

https://www.amazon.com/Hot-Racing-A...hvlocphy=&hvtargid=pla-4584276303934562&psc=1

 

[Barmaleus]

@morrjr71 Understood, thank you! Looks like something to think about.
I loosened the yoke screws a tiiiiny bit. Much better now.

Thank you for your advice! =)

 

[Barmaleus]

That's sad. Hot Racing said they don't ship to Europe.

 

[TheStapler]

I had the same issue and was due to the gear wasn't machined very well and in the end i used a small file to fix it. Here is a sample.

 

[danny1202]

I had the same issue and was due to the gear wasn't machined very well and in the end i used a small file to fix it. Here is a sample.

View attachment 347475

Well spotted that man.

@morrjr71 Understood, thank you! Looks like something to think about.
I loosened the yoke screws a tiiiiny bit. Much better now.

Thank you for your advice! =)

I think you can get them on eBay.

 

[Barmaleus]

I had the same issue and was due to the gear wasn't machined very well and in the end i used a small file to fix it. Here is a sample.

Ugh, nasty. For now the front diff moves well enough. Reassembly helped somehow. Rear diff was ok after reassembly and extra oil. Will be dealing with the center diff over the weekend.

I think you can get them on eBay.

Ah, I'll check it out. Lately eBay is far from my 1st choice. Forgetting about it =)