Gears Crunching

[bacala600]

Hey guys I got a problem that I can't figure out. I have got about 10 flights on my 700 and although I've had a couple issues come up I have managed to solve all but one. My problem is that I keep hearing a crunching sound almost like a gear stripping every time I piro stop hard and once when I did a piro snake. I have checked over every tooth on every gear and even cleaned out the one-way bearing thinking it might be slipping and still I hear that crunching sound. I remember reading something about this a while back but could not find the thread, does anyone know what could be causing this, please help!

[george0079]

the mesh of the crown gears for the TT? One of the guys at my field had this problem on a brand new setup. The tail drive gear was slipping

[bacala600]

I just pulled apart the boom block to check for slipping, I noticed on the front TT gear set that only the crown gear is pinned and their is no pin on the rear TT gear set, so it is possible the unpinned gear is slipping on the shaft? what is the fix for this? should I just swap out the gear sets, do you know if it is only the rear set slipping?