DEX210 Loud Noise

[Xangi]

I've just finished putting together my first RC car which is a Team Durango DEX210.

The car does run but makes a loud screeching noise when I'm on full throttle, if I pick the car up this sound changes to more of a drilling sound.

This comes from the rear of the car but i cant pinpoint it. If it helps the wheels appear to vibrate a little (when there is no traction on them).

Any ideas what might be causing this?

[AfroP]

wheels vibrating when lifted off the ground could be the droop screw not being unscrewed enough.

as for the other sound, I'd suggest it could be something to do with either a loose slipper or diff, maybe even both and possibly a bad mesh between spur and pinion.

i'd recommend taking it to you local track to see if anybody can offer any better advice

[MatJohnson]

Sounds like the diff.

[AndyG]

somethings to test & check....

- Pinion to spur mesh.
- Is the gearbox free? It is possible to overtighten and bind up the 210 gearbox imho. I test it with the pinion off and the driveshaft unconnected. I gradually tighten the 5 gearbox screws in turn until it starts to cause a tight spot, and then back that screw off slightly so it is free.
- Wishbone droop screws as mentioned ... if, with everything assembled, you apply the throttle, does the problem only occur with the wishbones at full droop ?
- Slop ... given it's a fresh build, it may be a simple build error ... have you got any excessive play in your suspension ?

happy to help

[Jason A]

Have you used to much thread lock on the grub screw that holds pin on the drive shafts.

You will find that the drive joint is tight to move.

If its not that then its the diff slipping or the slipper.

[morpheus2010]

Could be the Ball diff is not tight enough, loose slipper squeaks but loose ball diff screeches.

Tighten up the diff screw (705030 page 22 of the manual) if that the case

Its possible to over tighten the gearbox screws, that binds the assembly and may be worth checking as AndyG sez

[Chris-S]

Originally Posted by Jason A

Have you used to much thread lock on the grub screw that holds pin on the drive shafts.

You will find that the drive joint is tight to move.

If its not that then its the diff slipping or the slipper.

No need for the grub screw in the driveshafts, as the pins are held in by the bearing.

[steveproracing]

Here's a simple one to try
Check you have not tightened your wheel nuts up to tight.
This is really easy to do on the car with plastic hexes.

Best thing to do is as said earlier
Remove pinion and check everything is free.
Gearbox should spin for several seconds with wheels on!

If all is ok
Here's a simple way to set diff and slipper

First. Tighten slipper nut fully up
Then hold the spur gear and a wheel with 1 hand
Then try to turn the other wheel. It should take a fair bit of force to do this!!

If its too easy tighten the diff screw and repeat the testing until it is hard to turn the wheel

Then you are ok to move on to the slipper
Back the slipper nut off til you can only see about 2mm of thread showing on the screw after the nut
Put the car on the ground and hold it flat to the floor with one hand
With the other try to move the spur gear forward with just your thumb
It should be fairly hard but possible without any pain

Now as a final bench test.
Try the diff test again but don't tighten the slipper nut anymore
Ie hold the wheel and spur with one hand and rotate the other wheel with the other
You should be able to rotate the wheel. There will be a reasonable amount of tension but nowhere near as much as when testing the diff

Whilst rotating the wheel watch the slipper nut
It should rotate. If it doesn't then your slipper is still tighter than your diff

Lastly final settings to slipper can only be doe trackside
Set your car off full throttle. Listen to that slight squeeling /slipping sound
Set the slipper so you can hear this for about 10-15feet if
You hear nothing slipping or the car wheelies then it's too tight
If it travels for ages before stopping its too slack

Once you are in the 10-15feet range then that is roughly the sweet spot for that surface but play about with a 1/4 turn of the slipper either way to find your own favoured setting

Sorry for the long winded reply
Hth

[adey]

I was watching craig collinsons car at ardent a while back and it sounded awful but he just said he liked a noisy car. Odd but true

[/tobys]

Also check your meshing and that the gear cover is not catching on the spur.