Matrix 2 rattle noise

[Jmwilson22]

Just wrapping up a build and noticing that the matrix 2 center pin has a nyloc nut on the back with a washer at the front and rear.

Seems like this center pin needs to be loose so the truck can pivot. I.e. if you tighten up the center pin super tight, I imagine it would bind the pivot up.

Since the center pin is loose ish, the washers can rattle around which is annoying. Is there a way to fix this?

I swear when I tightened it up just enough so that it doesn’t rattle, it ends up working itself loose again due to the side to side pivoting movement.

Not sure if I explained that well. I’ll add some pictures tomorrow and take a closer look at the setup.

Thinking maybe a thin tpu or rubber washer could be used to dampen the metal on metal contact.

[Venom121212]

Reply to “Pictures and nothing else” thread 2024

Moon man is on it and they do not disappoint. That sloppiness would happen over time and I’d have to keep cranking down the kingpin hanger nut to tighten it back up. Eventually I started double nutting the kingpin and that helped some but after a few months, I could tell it was coming back a bit. It gets particularly noticeable when you’re turning and hit a decent bump or crack. The sloppy truck will skip and realign which made for a weird turn experience. When I threw the moon hanger and bus…

Yeah this was a pretty common complaint. I have some urethane replacement bushings that replace the metal king pin bearing if you want to try them out. Before I had those, I was double nyloc nutting and cranking them down. The nut shouldn’t restrict the movement of the hanger, even when fully tightened.

[Venom121212]

Pictures and Nothing Else!

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Pics of what I’m talking about

[Quiles]

I have the same issue…but my bushings are pretty old, not sure if thats the root cause. The cracking sound is annoying.

[Jmwilson22]

Oh interesting, I’m still trying to wrap my head around how that reduces it? Did that work for you?

Here’s what I came up with.

3d printed some tpu washers. Basically prevents metal on metal contact. In the short test run that I just did, it seems to have solved the issue

[fessyfoo]

hypertrucks have the same problem.
The nut should tighten to the shoulder that way it won’t come loose.

@fessyfoo

check your flange bushings for slop before every ride.
don’t overcompress them, don’t under tighten them. use shims on the backside of the kingpin bolt so you can tighten the nut against the shoulder bolt and have things just right.

rephrasing:

@fessyfoo

one thing that helps… but doesn’t fix some of the issues… is to make sure the “kingpin” nut locks down onto the shoulder bolt and does not overcompress the flange bushings. this has to be done by finicking around with shims to get the spacing right. this eliminates the nut coming lose causing slop and wear on the flanges from the slop. it prevents overcompression of the flanges which leads to slop. it does however slowly develop slop as the flanges wear out… which is faster than anyone wants.

iiuc what venom did,

replacing with the igus flange bushing with a urethane replacement like moon offered probably greatly resisted the wear and overcompression.