Getting rid of slight spur wobble - RC-Monster Forums

simplechamp · **Getting rid of slight spur wobble -** 05.01.2010, 01:51 AM

So I've been using my 52T Slipperential in my truggy for awhile now and I absolutely love it. Best upgrade I've ever bought, by far. Only thing is right after building it there was a slight, very slight, wobble in the spur. I tried a few things to remedy it (retighten cap screws, reseat slipper pads, reseat teflon bushing, change orientation of spring washers) but I couldn't get rid of it. I figured maybe it just needed to be run in and would go away on it's own, but so far it hasn't. It's not a big deal because it's very small, the spur and pinion aren't wearing awkwardly, so I wrote it off.

But then tonight I built my second one, a 46T for my buggy, and the same thing happened, slight wobble. This time the slipper pads needed some sanding to fit, but I did that, and also tried all the other things, but there is still a slight wobble.

At this point I am thinking I must be doing something wrong, but I can't figure it out. I follow the directions to the letter, make sure everything is seated perfectly, make sure all the screws are tightened uniformly and in correct order. As I already said it's not that they are causing a problem, it just kind of nags at me because I know they shouldn't do that.

Anyone have any ideas? What am I overlooking here?

suicideneil · 05.02.2010, 09:49 PM

Well, best comparison I have is the older 3906 slipper; dreadful for getting spur wobble because of the spring. The solution I used ( before switching to a solid metal tube to replace the spring... ) was just a thin shim or washer on each end as you assemble it, then that removed the uneveness of the rotation. Might be worth a shot..

simplechamp · 05.02.2010, 11:12 PM

I might be a bit dense, but I'm having a hard time picturing what you suggest, or at least how to apply it to the Slipperential.

It's just weird because the way the Slipperential is designed it seems like it should be practically impossible to have any wobble.

bruce750i · 05.03.2010, 11:30 AM

Do you have the little half moon tab rotated into the tab cut out on the pressure plate?

suicideneil · 05.03.2010, 06:28 PM

Huh, just looking at the picture of the dismantled slipperential- yeah, no way to implement my idea, completely different design. As you were then....

Arct1k · 05.03.2010, 06:37 PM

Shim everything ok? Bearings seated properly?

simplechamp · 05.04.2010, 12:30 PM

Yeah, the pressure plates and bearings are properly seated. I'm not an expert at shimming but everything seems good on that front.

The only part with the wobble is the spur, it's not the whole diff wobbling, so that leads me to believe it's either the slipper pads or the springs causing the issue.

simplechamp · 05.09.2010, 08:33 PM

Well after further study I've isolated the wobble to the pressure plates and thrust bearing. Somehow they are not sitting evenly. I'm not sure how to fix this though. The pressure plates are supposed to take the force of the spring washers and apply it evenly across the thrust bearing, but they somehow are not. The little rollers on the thrust bearing are uneven relative to the thrust bearing cage that holds them in place.

Any more suggestions? I feel like I've tried everything, but it might end up being something simple I overlooked, it usually does...