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Old Oct 26, 2014, 07:41 AM
Keith
United States, FL, Fort Lauderdale
Joined Sep 2013
3 Posts
Question
300 cfx main gear

Has anyone changed the main gear in a 300 cfx? I damaged a few teeth in a crash and was able to repair it with a file but it is going to need replacement. It looks like it could be quite a project so I am hoping for a shortcut.
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Old Oct 26, 2014, 01:39 PM
Registered User
Canada, BC, Vancouver
Joined Feb 2014
89 Posts
I've done it once.

From memory, first disconnect the cyclic servo links from the swash. Loosen the screws on the boom mount, push the boom in to provide slack to the tail rotor belt, and then slip the belt off the gear above the main gear. Remove the anti rotation guide. Remove the screw holding the belt gear to the main shaft. The head and shaft should now be able to be pulled off the gear and off the heli, and the gears can then be slid out. It took a bit of a tug for me to remove the head.

From memory, the belt gear is pressure fitted onto a sleeve on the main gear, so it is pulled apart.

I hope I haven't forgotten anything.
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Old Oct 27, 2014, 04:59 PM
Keith
United States, FL, Fort Lauderdale
Joined Sep 2013
3 Posts
Thanks for the feedback!
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