Removing the main shaft from the Sceadu Evo 50 head assembly
| Author: | Rob Turnbull |
|---|---|
| Article Date: | 26th April 2007 |
With the head removed from the heli body (see article for instructions), we need to remove the Jesus bolt holding the head block onto the main shaft.
Remove the Jesus bolt
Jesus bolt removed
Disconnect the links connecting the lower mixing arms to the flybar carrier, also disconnect the long links running up from the swashplate to the upper mixing arms.
Detatch swashplate and mixing arms links
Detatch swashplate and mixing arms links
The main shaft should now be fairly easy to pull out of the head block, with a few components still left on the main shaft. These are the radius block (two metal pins protruding down from a plastic housing, also known as the washout guide), the washout base (slides up and down the main shaft held in place by the washout guide), the lower mixing arms which are attached to the washout base, the swashplate, and the main shaft locking collar.
Next we need to remove the remaining items from the main shaft. To do this, we simply remove the main shaft locking collar and the radius block (washout guide).
Undo the two grub screws holding the locking collar onto the main shaft, and slide the collar off the shaft.
To remove the radius block, undo the two small bolts from the plastic housing, one in either side, and both backed by nuts. With those removed, you should be able to pull the radius block off the main shaft.
Remove main shaft locking collar
Remove radius block (washout guide)
The rest of the items (swashplate, washout base) will then freely slide off the shaft.
To check for a bent main shaft, one of the best ways is to roll it on a flat surface, such as a kitchen worktop or a mirror. Roll it slowly and check for gaps underneath as it rolls along.
Notes
It's possible that the main shaft can become worn leaving burrs where the grub screws in the locking collar have been tightened onto it. If this is the case, it can help in removing the swashplate etc if you rub the burred area with sandpaper first.