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How to Fix a Stuck Servo

A servo is a device used in radio-controlled cars and aircraft. It contains a small motor and a system of gears that control the speed and torque of the vehicle. The gears are delicate and can become jammed following minor crashes or hard landings, or even just from wear and tear. A stuck servo can be fixed by adjusting the gears inside the unit. The repair requires close attention to detail, but it̵7;s quick and cheaper than replacing the whole unit.

Things You'll Need

Screwdriver
Clear adhesive tape
Tweezers
Spray lubricant
Replacement gears

Instructions

- 1
  Prepare your servo for maintenance. Disconnect the battery and remove the servo arm to provide access to the cover.
- 2
  Tape the back cover of the servo to your work surface. This will hold the device in place and prevent the gears from coming out while you work.
- 3
  Remove the small screws from the back of the unit and lift off the front cover.
- 4
  Remove the small gears one by one and inspect them for damage. If any teeth are missing, carefully remove them from the unit with tweezers.
- 5
  Remove the main gear. Use a flathead screwdriver to lever off the plastic pin and metal bearings.
- 6
  Spray a little lubricating oil onto the bearings.
- 7
  Return all the gears, replacing any broken ones.
- 8
  Spray a little oil into the main unit of the servo.
- 9
  Put the cover back on, taking care not to over-tighten the screws.
- 10
  Test your servo. Put the servo arm back on and wind it through a few times to check that it runs smoothly before reconnecting it to the battery.

Aviation