Some diff help maybe? Just rebuilt, seems funky.

[lykan]

I just rebuilt my t-maxx diff and I have a few questions.

It seems a little well.. sticky.. The side output shafts have a ilittle in and out play that seems fine, but is the play supposed to be there?

Second the input shaft (comes form the tranny) if I pull outward on it, it's pretty smooth but catches from time to time.

If I press inward on the input shaft it kind of binds, and I can feel it roll from tooth to tooth.

Is that play supposed to be there in the diffs?
Is it rough and binding when I put pressure on it, because they are new gears and not "worn in" yet?

It seems that's all I had time to accomplish today

Kinda bummed out today was supposed to be a free day.. hah! too many people found out I was home and had no kids... can you say "welcome to the free computer help line, how may I help you" :nope: fun

 

[SkyMaxx]

Originally posted by lykan
I just rebuilt my t-maxx diff and I have a few questions.

It seems a little well.. sticky.. The side output shafts have a ilittle in and out play that seems fine, but is the play supposed to be there?

Yes. That is normal.

Second the input shaft (comes form the tranny) if I pull outward on it, it's pretty smooth but catches from time to time.

If I press inward on the input shaft it kind of binds, and I can feel it roll from tooth to tooth.

Is that play supposed to be there in the diffs?

Yes. That is also normal.

Is it rough and binding when I put pressure on it, because they are new gears and not "worn in" yet?

The rough feeling is new gears. What weight oil did you use...if any? The diff will pull those input and output shafts away from a compressed state when they get moving. That will allow everything to move the way it should. If the diff feels like it is binding, ie it gets stuck a time or two, you might want to pull it apart and make sure everything is where it belongs.

 

[lykan]

I used diff grease. Some reall thick I guess you would call it gear grease. It's nice smooth grease, just a little on the thick side.

Thanks for the quick reply, glad to know it went together right. I assembled it just like tohe old gears came out. Hard to belive that little mach .15 stripped those heavy metal gears. By the sounds of the diff you would have thought their was plastic inside.

 

[SkyMaxx]

The reason it moves smoothly when you pull on the shafts is that you actually help the mesh of the gears. When you push in on the shafts, you compress the mesh and thus bind the gears. Just some information for your future use.

 

[lykan]

Now that makes perfect sense. Looking at them I just assumed the shape kept them from having the type of mesh issues the spur gear does..

Now I know why 1/1 cars diffs are a specialty

 

[Diver6127]

Originally posted by lykan
Now that makes perfect sense. Looking at them I just assumed the shape kept them from having the type of mesh issues the spur gear does..

Now I know why 1/1 cars diffs are a specialty

That's the truth. tight tolerances and specific back lash tolerances will determine the life of the gears. Not too expensive on r/c's but deep pockets are required for 1:1 if it fails.

 

[olds97_lss]

Also, if you put the outdrives on or the axles, there's a collar on them that pulls the shaft out a little bit to take up the slop. If you were spinning and pushing without the axles attached, you weren't feeling how it would feel if they were.

I noticed that the last time I worked on mine. I run steel cvd's all around, so I have outdrive cups. When I put the cups on, it smoothed out the diff.