Through our experience we have noticed a reoccuring trend in causes of servo failure. We are providing this information to you to help ensure you receive good reliable service from your JR Servos!

JR Servos are all supplied with small rubber mounting grommets to isolate them from vibration. This is very important in a helicopter, as the natural vibration from a 2-Stroke engine and the rigidity of carbon frames, provides a very hostile environment for your radio equipment.

If you fail to ensure the servo is isolated from this inherent vibration, then the servo will soon fail. To ensure correct the correct fitting of your servo please read the following tips:

1. Screw Tightness

Always use the supplied brass ferrule to prevent the rubber grommets from excessive compression. It is common for the shoulder end of the ferrule to be mounted against the servo mount. When installed correctly, you should still be able to rock the servo slightly, therefore showing that the rubber mountings are doing their job.

2. Servo Webbing

JR Servos come with a small strengthening fillet on the mounting lugs. This webbing provides extra support for the servo. This webbing however can interfere with the frames on a helicopter if the frames are mounted on top of it. If this is the case, then when the servo is tightened down, the servo will be in direct contact with the frames of the helicopter. This in effect bypasses the rubber grommets and transfers all the inherent vibration of a helicopter straight to the servo. To reduce the risk of damaging the servo we recommend that a small notch is filed in the frames to ensure the webbing can not come into contact with the chassis.