1. Waterproof your Hitec Servos

Locate the 4 screws on the bottom of the servo

Remove the 4 screws using the Phillips #1 Screwdriver

Remove the bottom plate with the screws from the servo and sit to one side.

Ensure you have removed the servo horn or gear from the spline of the servo before attempting this step.

Pull the top cover of the servo away from the servo body to remove it.

When removing the top cover ensure the gears stay in place.

If any of the gears do get removed. Use the image as a reference of how they should be put back on.

Turn the servo over to show the bottom where the motor and circuit board are.

Carefully lift out the circuit board to reveal the space underneath it.

Fill the area underneath the circuit board with silicone grease.

Carefully place the circuit board back into its original position.

Cover the top of the circuit board and motor with silicone grease

Fill under and around the gears with Silicone Grease

Fill the lid with Silicone Grease

Now that the Lid and gears have been filled/covered with silicone grease we can reinstall the lid

Ensure that the red O-ring is seated correctly on the body of the servo before proceeding

Carefully place the lid back on ensuring to keep the gears in there original position. Wipe of excess silicone grease that is pushed out as the lid is pushed on

As you push the lid back on keep an eye on the o-ring that it doesn't try to squeeze out the sides. If it does use something to push it back in.

This part can be a bit fiddly but is important to be patient as we don't want to damage the o-ring as it will affect the sealing of the servo

For some added safety to water ingress you can add some silicone grease around the spline of the servo before inserting the gear or servo horn back on

I also fill the center of the spline and gear with silicone grease

Fill the bottom plate with silicone grease

Ensure the o-ring is in place on the bottom of the servo body before continuing.

Place the bottom plate back onto the servo again watching the o-ring to ensure it stays in place if not push it back into place

Wipe of any excess silicone grease that squeezes out

Insert 2 screws in opposite corners and screw them in 90% of the way.

Insert the last 2 screws and you can screw them in 100% and go back to the first 2 screws and screw them in 100%

The servo is now back together and ready to be tested.

Ensure that you test the servo before installing it into the Sub. If it isn't working you can open it back up and check all the wires are still intact.