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Servo Glitching

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Whistlre

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Okay I just went through the Search and read all the Servo Glitching posts and just about all of them state that it is probably metal to metal causing the glitching.

BUT, I am getting glitching before I even start the vehicle. I turn on the reciever and as soon as the power is applied to my radio I get glitching.

My glitching definition: Servo is noisey like its trying to move, but I don't see any of the servos moving. When I apply throttle it works fine a few times and then it will return back to neutral in an unaturally slow manner with no response till it hits neutral. Same thing with my steering servo.
I just replaced both of these servos yesterday with brand new Airtronics 94757z and 94758z digital servos. I did leave my original Traxxas transmission servo in place and connected it to the reciever also.

I am about to remove all the electronics and see if I still get the glitching without even being hooked up to the vehicle. Just a little frustrated and agrivated. Everything worked fine yesterday even with the noise till the steering locked up. (Pillow balls were too tight.)

Thank you
Whistlre
 
Check your batteries you may need new ones or you may need to charge your pack.
 
Checking the batteries is a good thing. Which servo does this? Or do all of them do this?

If it is the steering servo, odds are the tires are not centered with the linkage and servo. For instance, you have the truck sitting on the ground with the wheels turned to one side. You then turn on the radio and receiver and hear a noise coming from the steering servo. That noise is your servo trying to recenter itself and not being able to. Try centering the front wheels and turn on the equipment. If you still get the noise, you might have another issue.

If this is the throttle/brake servo, the same thing applies.

Basically, any time a servo is started up it starts at neutral until you put an input in via the radio. If the linkage attached to the servo is not also in a neutral position (wheel centered, throttle closed, etc), the servo will work hard to attain the neutral position. If it can not do so easily, then it will generate a bunch of noise while it tries. That noise is the motor and gears working hard to get centered.

So, try the new batteries. Put everything to a neutral position and then turn it all on. See what you get.
 
Not the batteries...brand new set of Alkalines....
Also took a freshly charged set of NiCds and same thing.

Yes it is both the steering and the throttle servos....

Removed the servo horn so there was no tension on the servo. It still makes this noise not all the time like it did with the servo horn on it (will adjust this, but still have the noise)... Sorta like an insistant gnat or mosquito buzzying directly in your ear.

Is this normal? Never had digital servos before...

Whistlre
 
Digital servos will hum. Anything beyond that is what I described above.

If the servo starts twitching, that would be known as glitching (no rhyme intended).

You are probably fine. Put it back together and run it. Anything that is moving slow, you might check for binding. Other than that, running digital servos with dry cells can also be challenging (or so I am told). You may want to up it to a hump pack.
 
well humming isnt really glitching so like Sky said you should be fine most servos do that if theres a lil bit of tension on them dont worry about that and also like Sky said your running digital servo s so you should really think about getting a nimh hump pack cause digital servos take a big drain on your batteries.
 
Always turn on the car with the front wheels off the ground. They will "seek center" when you turn on, and will not be under load. Since you have checked all the basics, such as metal to metal and batteries, it sounds like a slight glitch in the reciever. Has it ever gotten wet? Even high humidity can find it's way in there and cause the chattering you're experiencing. If it has, there could be a bit of oxidization on some contacts inside, causing some electronic resistance in the circuitry.
Open the reciever and check for any dullness or white fuzz on any contacts. mist it with WD-40, and blow it off with air. Avoid touching anything since oil from your fingertips will cause more oxidization later on.
There are adjustments in there for tuning precicely to the frequency you are running (trim) but that should only be done by the manufacturer. Mess with these, and you'll make it a lot worse. You can shorten your range or interfere with someone else's frequency.
If you still get the chattering after checking everything, I recommend you send the radio and reciever back for fine tuning.
Hopefully it's a simpler problem.
 
Okay took the T-Maxx out today and played around with it before starting up the engine and I got no slow responses or slow returns. Don't know what exactly was causing it to glitch out yesterday but today everything worked very smoothly.

Thank you for the assistance.

Will be working on getting the correct testing tools to adjust my camber and toe in. Having never worked on this before it is a bit challenging to do by eye sight. I believe I dorked up something (transmission) due to it not being aligned properly.

Whistlre
 

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