Drivetrain noise

[JustinL7294]

Recently I purchased my bomber kit and this is my first solid axle rc. Build went smooth but I do notice the drivetrain is noisy. Everything works smoothly with no binding but since this is a first for me I’m not sure if it’s normal or not? It doesn’t sound like grinding or anything so I’m assuming it’s normal.

[BAD RC]

Check Spur and pinion gear mesh. If the mesh is too tight, it can and will make noise.

SENT from THE DARK SIDE of THE MOON

[Steve g]

To add to the pinion and spur answer, I had a cheapo aluminium pinion set that was really noisy, probably from bad tolerances in the teeth. I ran a few packs through it, still loud. Once I figured out the size I liked I ordered a real one.
Is it doing it with the motor disconnected? In reality if there's no binding it probably won't be an issue. Well hopefully anyways

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[JustinL7294]

Pinion spur mesh is okay. Can the pinion mesh in the axles be adjusted?

[HumboldtEF]

You can adjust the mesh in the diff with 5mm ID shims, its not something thats included with Axial kits though.

[IntrepidMercians]

I noticed the same thing and think in my case it is because the tooth pitch is not perfectly concentric to the shaft bore.


If I rotated the wheels slowly I could hear the noise coming and going as the spur gear rotated the motor pinion.


I think the spur gear is the main culprit and found that the Axial 56T metal spur gear was eccentric, the 64T and 56T less so.


Of all my pinion/spur combinations the 13/56 is the quietest running.