General Section 30
Servo Precautions
• Do not lubricate servo gears or motors.
• Do not overload retract servos during retracted or
extended conditions. Make sure they are able to
travel their full deflection. Overloading or stalling
a servo can cause excessive current drain.
• Make sure all servos move freely through their
rotations and no linkages hang up or bind. A
binding control linkage can cause a servo to draw
excessive current. A stalled servo can drain a
battery pack in a matter of minutes.
• Correct any control surface “buzz” or “flutter” as
soon as it is noticed in flight, as this condition can
destroy the feedback potentiometer in the servo.
It may be extremely dangerous to ignore such
“buzz” or “flutter.”
• Use the supplied rubber grommets and brass
servo eyelets when mounting your servos. Do not
over-tighten the servo mounting screws, as this
negates the dampening effect of the rubber
grommets.
• Ensure the servo horn is securely fastened to the
servo. Use only the JR® servo arm screws
provided; the size is different from other
manufacturers.
• Discontinue to use servo arms when they become
“yellowed” or discolored. Such servo arms may
be brittle and can snap at any time, possibly
causing the aircraft to crash.
• Check all related mounting screws and linkages
frequently. Aircraft often vibrate, causing linkages
and screws to loosen.
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