I recently baught the Airtronics M8 Radio kit that comes with 2 x Hyper ERG-VX Servos with 13kg torque, .10 speed the whole kit is brand new. I have put the servos on my hopped-up MP7.5 Sports RTR. I just added the arms and connections for the steering servo and it started to buzz quite loud when I switched it on. There was no buzzing until I connected it to the servo saver (where it would have been ready for use if not buzzing), is there a reason why it would start buzzing when connected to the servo saver??? is it the pressure applied from the connecting rods/arms?? and what can i do to stop the buzzing??? I am only new to RC and I dont really know my way around the M8 radio just yet, but I do have access to some brief M8 instructions, BUT I would appreciate it very much if you could please be clear in your suggestions/instructions. Thankyou.

Make sure that the servo is centered before you attach the servo saver, that will help, what you do is before you attach anything to servo, turn on radio and turn on car recevier, the servo will get to mid point,
then connect the arm to servo, this should do the trick, then u can make slight adjustments with radio trim!

Servos Buzz, it's the way they work. Theyre just recoiling back to the position they think they should be in. Start worrying when the buzzin stops and the smoke starts.

Yea- I don't know about that one Alex. My 94359 and 94360 ERG VRX Servo's only buzz when they are something is not right and they are trying to center themselves. Your gonna have to keep that in mind and mess with your radios settings and position of the servo horn/linkage to adjust it to dead center so it isnt struggling to center itself all the time.

yeh skyline is right mine don't buzz either only when theres a problem.

I now have it so when it is connected and I switch it on it is fine, but once I start turning left and right it starts buzzing agagian, it cant seem to get back to centre once I have turned to either side. The car it is on is a hopped-up MP7.5 Sports RTR, and I recently change a few things on the front - 20 degree hubs, upper arms, universals etc. and since then just turining the steering from one side to the other by just grabbing on to the wheels and turning with my hands (while no servos are connected) seems to be a bit tight and I thought the servo may be having problems because of this??? If I cant fix this in the next day I am going to put back my original servos/radio, front hubs etc, at least until after Christmas/NewYear because I cant get any help from the LHS trhey are "too busy" (I didnt buy my car from them, hint! hint! "piss off until you buy a car from us, just buying parts & accessories isn't good enough!!" ) and i want to use at least one of my two buggies over the holiday period. PLEASE HELP!

Disconnect the servo horn from the servo. Check to see if there is any binding in the steering.

i have similar servos. my buz when you turn left right, thats just the way these servos are.

any pressure on these servos will make them buzz. to prove this dont connect the servo to linkages and turn the servo left/right - there will be no buzz, but once you apply a little back-pressure with your finger then it will buzz.

mine go back to center, and the buzz stops. i not sure why your one not. did you use the servo horn that was provided? if your servo horn is loose then it wont center.

i had my on for 3 gallons on my wrx and vb servos and no problems.

Now you see FET servos buzz a lot more because they generally work quick. I is just the feed back system continuously telling the motor to swap directions. KO Propos buzz like hell but that's just coz they are so darn accurate. Hitecs and Bluebirds.... well lets not go there.

Yeah, mine start off fine at centre when switched on but once I start turning they start bussing and dont quite make it back to centre unless I gice the radio steering wheel a little flick and then it centres BUT I shouldnt have to do that. I was wondering what are some causes that might make the steering a bit stiff?? there is nothing jammed in any of the moveing parts, it seems like something has just been tightened too much, I added some oil to the screws that hold the hubs and i loosened the servo saver but it still semms a bit stiff, any suggestions???

I think your refeing to this thread [link=http://www.rcuniverse.com/forum/Steering_Knuckles_MP7%255/m_2457419/tm.htm]Steering_Knuckles_MP7.5[/link]

Definitly sounds like something is binding in your steering linkage, causing the servo to strain trying to center (giving you the buzz). Does the 7.5 come with a built in servo saver? If so these can easily be over tightened when they are installed on most cars, often the bushings they come have some flashing left on them from the molds that can make them a tight fit. To help find where its binding pop the tie rods off at the inside and turn the wheel to see if it still binds (the wheel/tire of the car, not the transmitter). If so then look towards your hub carrier, if not, its probably in your rack and/or servo saver unit.

If your car doesnt have a built in servo saver (pretty sure it does though) and you're using an aftermarket unit that attaches to the servo directly ensure that it doesnt rub on things like the servo mount, braces, etc..

Its also possible that one of the rod ends or ball studs has been disfigured a bit and is providing to tight of a fit, causing it to bind. To check that just wiggle the tie rods to see if they move freely. If your car uses one for Ackerman check it as well (along with the rod from the servo to the linkage).

Well it is 3:00AM here in Australia and thanks to the help of "Uberchav Alex" I have finally fixed the problem, I had my top hat spacers in my steering knuckles around the wrong way this really stiffened my steering so the servo was straing to centre itself, hence, the buzzing!! Such a simple problem caused me so much frustration, isn't that always the way it is??

Glad ya got it fixed

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