HO W TO INS TALL A NE W SERVO
Insert a screwdriver blade and pry gently to remove a stubborn servo horn.
;e screws on either side of the servo hold it in place. All the screws will likely be the
same size, but if any are longer or shorter, remember where they go.
Pay attention to the
beveled or finned
edge of the plug when
installing it in the
REMOVE THE SERVO HORN
You may need to first remove the servo to access the servo
REMOVE THE SERVO
horn. If that’s you, skip ahead to step 3. Otherwise, just remove
the screw in the center of the horn, then pull it o; the output shaft. If
the servo horn is stuck, use a screwdriver blade to gently pry the part
o; the servo. If you’re replacing a steering servo, you may be removing
a “servo saver” instead of a horn. No worries—all the steps ahead are
Most servos are held in place by four screws, two on each
PLUG IN THE NEW SERVO, AND
side of the servo, but some vehicles have one screw per
side. Remove the screws to free the servo. If the screws are di;erent
lengths, make note of which screws go where.
CENTER THE OUTPUT SHAFT
Switch your transmitter on, and center the trim dial for
the channel you’re using (“ST” = steering, “TH” = throttle). Plug the
new servo into the correct receiver port, and power up the receiver.
Operate the transmitter to make sure the servo is responding. If it
doesn’t respond, you may have inserted the plug backward or into the
wrong channel. Some plugs have a fin on one side, which makes them
impossible to install backward, but others just bevel the edges on one
side. You can also look at the plug wires. ;ere will be a white wire in
the middle, with red and black wires on either side. If the other plugs
in the receiver have their black wires on the right, for example, plug
your new servo in the same way.
INSTALL THE SERVO
…or skip to step 6 if you can’t access the servo-horn screw
once the servo is in the car. Just reinstall the screws you
removed in step 3. If your new servo is slightly larger or smaller than
the original and doesn’t fit quite right, you should be able to adjust the
servo mounts. One or both of the screws that hold the mounts to the
chassis may be slotted to accommodate di;erent servo sizes. Loosen
the screw(s), and slide the mount(s) as needed.
Note the slotted hole for the
left servo mount. It allows the
mount spacing to accommodate
di;erent servo sizes.
Be careful not to strip the servo mounts by overtightening. Snug is all you need.
Center the trim dial
before you power
up. We’re installing
a steering servo,
so the steering
trim dial (here,