Is my new TH supposed to make grinding noises?

[Damatheus]

Just got a new TH yesterday and the first time I turned it on the shift servo sounds like it's constantly spinning and grinding. I did the servo adjustment and it shift fine, but the noise never stops. I don't see any fans anywhere...

[willyg1981]

It's possible that it's not quite meshing properly if you can disconect the shift rod and find the neutral position between first and second it may allow you to pin point the problem better I'd definitely check inside the gearbox tho just for piece of mind !


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[Damatheus]

Originally Posted by willyg1981

It's possible that it's not quite meshing properly if you can disconect the shift rod and find the neutral position between first and second it may allow you to pin point the problem better I'd definitely check inside the gearbox tho just for piece of mind !


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It makes the sound with the shift linkage connected or disconnected. The noise starts the moment I turn on the truck. I read some reviews that say there is a cooling fan, but I've never heard one this loud. I can feel vibration coming from the shift servo, but it still seems to shift gears just fine.

I'll have to dig into it when I've more time.

[willyg1981]

Also possibly the shift servo hasn't been centred before installation ???


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[Richterat83]

Read the top sticky on how to set th shift servo.

[Damatheus]

I've adjusted the shift servo, and the truck shifts fine. The shift servo though makes a continuous grinding noise no matter how I adjust the end points, and whether it's connected or not or whether I am shifting or not. I verified it IS the servo by unplugging it, which made the noise stop.

I'm going to contact Vaterra and put in a warranty request, as it appears the servo is defective.

[Damatheus]

For anyone curious, here is a video of the noise it's making.

https://www.youtube.com/watch?v=PG-g...ature=youtu.be

[SkiSteve]

That's what digital servos do. More expensive ones are quieter. Yours does sound quite loud but I doubt there is anything wrong, it's just a cheap servo.
That's assuming of corse the end points are set correctly. Ideally set it so there is absolutely no force on the linkage in either gear and the ball studs rotate freely with your finger if you wobble them side to side

[Damatheus]

Originally Posted by SkiSteve

That's what digital servos do. More expensive ones are quieter. Yours does sound quite loud but I doubt there is anything wrong, it's just a cheap servo.
That's assuming of corse the end points are set correctly. Ideally set it so there is absolutely no force on the linkage in either gear and the ball studs rotate freely with your finger if you wobble them side to side

Dang, that's a nasty sound for it to be normal. But it is functioning normally, and I've set the end points well. Guess I'll order an upgraded one to get rid of the sound.

[SkiSteve]

They all make some noise as the servo is constantly applying power to hold its position. My understanding is that they "hunt" slightly for the exact position so they are always twitching a little. Mine does it too but to a lesser extent. Maybe someone else can advise of a quieter servo.

[Damatheus]

Ok, thanks for the help. Fairly new to the hobby and didn't realize digital servos would do that.

[Damatheus]

Well it failed in the first ten minutes of use even with the shift points set. It would just not stop making that grinding noise no matter what i did, now it wont shift. Time to contact vaterra or Amazon.

[Damatheus]

Ok so I took the TH hammer apart tonight and it turned out the shift service didn't fail. My remote had somehow set my A switch (for shifting) to "inhibit"

Once I set it back to operate auxiliary A (it's set to aux 1 2p) it works fine. But now it keeps setting it back to inhibit randomly.

Any ideas?

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[SkiSteve]

Yep, set all the settings as you want them and then re bind the radio. What radio is it, 4dxc?

[Damatheus]

Originally Posted by SkiSteve

Yep, set all the settings as you want them and then re bind the radio. What radio is it, 4dxc?

It is the D4XC yes. Ok, so set the setting and rebind. Will try that today. I played with it some yesterday and it seemed to be holding the settings over the course of a few hours, so I will check again today.

Ordered a new shift servo anyway.