Arrma Kraton 6S really noisy!

[PH001]

Hey all,

 

I bought a V2 Kraton 6S a while ago and have been carefully stripping it and checking all the parts before actually running it. I have cleaned and re-oiled all the bearings, shimmed the centre diff and put 30k oil in it (all internal gears are good and diff is nice and smooth) and generally cleaned the whole car up.

 

I ran the motor for the first time yesterday and just couldn't believe how loud it was - almost deafeningly loud. Just sounded really rough and unpleasant. Checked the gear mesh on the spur and pinion again which felt perfect (just a tiny bit of rocking on the spur with no tight spots) and all teeth in good condition. I then tried it with the driveshafts out of the centre diff and it was just as bad?? That only basically leaves mechanical noise on the spur / pinion?? The car came with a 14T  pinion and the standard 50T spur, they don't look very worn. Is it possible that they are the wrong pitch - I note the pinions are designated a MOD1 pitch but no mention what the 50T spur is? I was just assuming the mesh would be awful if one was 32p for example. It turns fine by hand.

 

Maybe I will make a video tonight on post on Youtube so you can see, AND HEAR! Or maybe the Kratons just are really mechanically noisy? It's about 3x as loud as my Hpi Truggy Flux.

 

 

Edited September 25, 2019 by PH001

[Bajadre]

Could try meshing your pinion /spur with a piece of paper between bud thats how i set mine all the time now ,wouldnt imagine there different pitched cogs you would know as they would stick alot !! my d8t has a noisy mesh where my mates doesnt even after changing spur and pinion just one of those things it runs fine though and doesnt wear etc ive only seen on kraton run and the drive trian was near silent upto mine same as my buddys outcast too

worth sticking a video up so we can see if you havent spotted anything  one trick i do on mine is use thin spacers under the centre diff 4 bolts so the spurs perfectly inline with spur

[PH001]

Thanks for the reply, I could try paper method I suppose but I've always had perfect results doing it by 'feel' with my other cars. I might just change out the pinion for a 14T RW Racing one such as this... https://www.modelsport.co.uk/rw-1-0-module-pinion-14-teeth-for-5mm-shaft/rc-car-products/34365

 

I'm not quite sure what you mean by spacers under the diff bolts? I just line up the spur and pinion by moving the pinion to the right place on the motor shaft.

[Tug]

Metal on metal is always noisy, but posting a vid would definitely help. 

[PH001]

49 minutes ago, Tug said:

Metal on metal is always noisy, but posting a vid would definitely help. 

 

Sure, but it's a very similar drivetrain to the Hpi Truggy Flux and that is super quiet by comparison. OK, I'll try to do a vid when I get home.

[Kukynas]

Motor? Make short video and it should be clear

[Tug]

Metal on metal is usually only quiet if the mesh is loose. 

[PH001]

Good point Kukynas! I should eliminate the motor internals by just running the motor by itself...I'll do that first. 

[mydoddy69]

2 hours ago, PH001 said:

 

Sure, but it's a very similar drivetrain to the Hpi Truggy Flux and that is super quiet by comparison. OK, I'll try to do a vid when I get home.

 

 Compared to the Truggy flux these do sound very loud almost like a bag of bolts being spun in a washing machine lol it’s pretty normal for the Arrma 6s range in general so I wouldn’t get overly concerned 👍

Edited September 25, 2019 by mydoddy69

[RCbutcher]

Damn that doesnt sound good why would it be? Not perfectly circular spur or something silly. It would have to be something silly if other rcs with metal pinion/spurs are much quieter. Could it be vibrations is it all alloy centre diff braces etc. Vs some plastic? 

 

The motor shaft not perfectly straight? Cheap motor bearings? 

 

Must be something. 

 

Put your finger on the CD top brace and give it a whirl feel the vibration. Centre shafts slapping the chassis braces? 

Edited September 25, 2019 by RCbutcher

[KarSick]

I have a similar problem. It's a Kraton 6s.

I took it out bashing and I think the mesh got out of wack (I was in dirt)

Now the car makes a really bad clicking sound but doesn't if I remove the pinion?

Is it possible to just change this pinion (14t?) or is maybe the problem inside the motor?

 

Thanks for the help?

[Partydaz]

No bits of stone or stuff stuck in-between the gears on the spur or pinon ? , that might cause the noise and it doesn't show up when not meshed together.

 

  

[Tug]

If the motor's moved, the mesh may be too tight, thus causing the noise. It'll also destroy one or both of the gears (pinion and spur). Check the mesh. 

[steephill]

My first kraton (a V2) was noisy. I instantly thought what's wrong, why is it so noisy.

If you have checked the gear mesh and all the drivetrain is smooth I wouldn't worry about it. 

 

[Tug]

Metal on metal should produce some noise, especially if the mesh is too tight. If it's too loose, it'll be near silent, which is equally as bad.