Servo Problems

[JTEC]

Anyone have an idea as to why the servos are going out?

[Bub G]

I personally have an 8ight and love the car very much ,, except for the servo problems that about 5 of us are having .. at first we thought it was just the throttle servos , but then my steering servo went as well as another one .. so if anyone else has seen this or knows about a link for this please let us know .. we would like to be able to have some fun without problems and keep others from having this problem also ... thanx 

[Bub G]

If you go to this article and read at the end ,,, the article is long and very well in depth with the 8 ..you will see this guy lost his throttle servo also .. he simply said he replaced it with a heavier one that he had with him at the track , and was back up and running ... maybe Team Losi just needs to put in a heavier duty servo ... we will find out for sure and keep ya posted ....


http://www.rcuniverse.com/magazine/article_display.cfm?article_id=809

 

[Bub G]

  I found this on another forum site guys good luck ... Bub G



Here is the answer to your servo problems. I found this on the s-grid-

SERVO FAILURES:

We found that in several cases (but not all cases) that servos have
been failing b/c the servos were not shimmed correctly.

If the bottom of your servo sticks down farther than the servo tray
post your servo will fail sooner than later. Several 8ights are
having failures so check to make sure the are shimmed correctly.

Mine was not shimmed correctly and it cost me a Airtronics 94359.

Learn from my mistakes so you don't have to.

If the servo it riding on the chassis in stead of being suspended from
the radio tray you will have premature failures.


My Aitronics servos require the rubber gromits and 2 shim kits to have
it shimmed correctly for both the throttle and the steering servos.

Also you will need 8 4x40 x 3/4" for this setup.

As alway you must check endpoints.

This is not a buggy problem. The buggy rocks.


Lets all give this a try .... 

[Bub G]

Mayhem.

The 100% epa, can or can not hurt your servos heres the reason:

Lets talk brake.throttle. Go to your throttle setting, and into epa.

Pull the throttle to full, with your fuel filter off. If the carb opens all the way, great. If its puling so hard that it pulls on the engine, thats too much. Hold it all the way open, and start to back the EPA down, you'll notice that the carb doesn't close for quite a few % of adjusting (usually)

Once the carb actually starts to close, open it back up one click, and your at your maximum adjustment. Any more doesn't do you any good and ruins your servo.

The same is done with the break. Full break, and adjust your epa. When the break is engaged fully, back down on the epa and try to get it set to a point where it is locking up your break without pulling the center diff out of wack, you don't need as much pressure as you might think on it, to stop the car.

A lot of times people will set up their break linkages unbalanced. The front will engage first, or the rear. You'll want this a little bit (I like more rear than front, so if i have to lock it up I can bring the rear around, and not push through corners) but too much means to get all 4 to lock, the servo has to pull a lot harder, which burns out the servo.

The same is then done to the front. Turn the car all the way left, and then back down on the epa. (Or up all the way first). Once you are backing down, and start LOSING steering, thats where your max goes. A lot of time people dial in so much EPA that it just pulls on the servo saver, and doesn't actually turn the front wheels.

[Bub G]

This Link is just in case you lost your manual to your Spectrum DX2 System ..


http://www.spektrumrc.com/Content/PDF/dx2manual-english.pdf

[JTEC]

Bub, Thanks for the Manuel on the DX2 I think that is going to help a couple of our drivers that didn't have the book.

[JtecJoe]

Hi everyone, having a lot of issues myself with the servos.  Mainly the throttle.  Went thru 4 already.  At wits end.  I need help from someone greater than myself.  Did everything by the book and still no end in sight.  Jeff is going to look at it next.  It should be like a tank when he is done.

Will keep everyone posted on progress.  Buy stock in servo companys i think they are going to do well this quarter.


Joe,  Keep your head in there you will figure it out.

[Doral]

Buy a REVO

[JTEC]

Might have to do that.  Thanks

[gonzo]

I have been running an 8ight since late last year and have not lost any servos. I do use high end JR servos (8800's and 9000's)but I don't think that is the reason I have not had any problems.

#1 USE THE SERVO MOUNTING GROMMETS!

#2 Get a King Headz servo brace. This allows the chassis to flex (and it does ALOT; thats why this car works so well) without smashing or pulling on the mounting ears.

#3 Set your endpoints to the safe side, especially on the throttle. Don't allow the servo to open the carb ALL the way. With the throttle pulled to full you should still be able to pull the linkage rod/carb barrel out another 1 to 2mm with your fingers. This allows the chassis to flex without the carb pulling on the servo through bumpy sections or crashes during full throttle application.

Lee Morrison

[JtecJoe]

Thanks Lee, Donnie's going to order me that brace.  I'll be back on track in no time.

[Doral]

OK sorry about comment earlier, buying a different truck doesn't solve your problems with the steering servo.

Reading from your other posters, it seems like your heading in the right direction to correct the problem.

Servos aren't cheap and to replace a few you can get very disappointed in the truck, buggy or what ever the RC your driving.

And if it's your first RC you could get tempted just to give the whole thing up. All I can tell you is DON'T. This is what this hobby is all about, I find pleasure not only running mine but repairing them too. I have run into problems with RC Trucks and even when I think there is no answer I will find a solution to it, and if it doesn't work I try again. Man over machine.

One good thing about this hobby there is allways someone willing to help you either in person or on a forum like this one.

Good luck finding your answer. 

[JTEC]

Gonzo, I have already ordered the trays from King Headz and Jim there was very helpful helping us stock the parts.  That is definitely a good operation there at King Headz.  Thanks again for getting us pointed in the right direction.  Adam also told us the same thing.  Hope to see ya today.

[JtecJoe]

Thanks Lee for stopping by and helping us with our servo problem.  Its nice to know that Horizon has people that know and are willing to help shops like ours be successful in the RC business.

Thanks again Lee


Joe Davis