ORIGINAL: jmcowart
Sounds like maybe the nose wheel is binding. Possibly it is too tight or the set screws are screwed in too tight, or the steering arm is rubbing or binding. If you haven't already done so, i would make sure the entire nose gear is free moving with no binding at all, anywhere. Mike.
With regard to the nose wheel - I have mucked around with this thing for awhile. The pre-drilled pushrod exit hole does not line up well with any of the wheel control arm holes, so that the pushrod bends within the exit hole during steering right or left, causing some resistance. If I keep the control throw minimal, there is less resistance. I just hope that little bit of throw is enough for useful steering during taxi. Guess I'll find out.
BTW, when either only the nose wheel pushrod or only the rudder pushrod are attached to the servo, there is very little binding / buzzing. However, when both pushrods are attached, that little extra bit of resistance is enough to cause buzzing at rest.