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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityAvant › Main shaft drive pin
01-20-2010 05:53 AM  8 years agoPost 1
Blax1

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Sydney Australia

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Hi guys

Anyone breaking drive pins lately or is it just me?

Lost one the other day, not a lot of damage, I was lucky, I've blue loctited it, same with grub screw etc, simply must have over tightened it, I guess.

Anyone using bolts, I'm thinking M3 titanium cap screw and nyloc nut, maybe I'll go by the book again, some say grind a flat on the pin, what are you guys doing, I know we've had this discussion before ideas and any latest thinking on the subject appreciated, its got me stuffed flew for a year solid then crunch....

Cheers

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01-20-2010 06:16 AM  8 years agoPost 2
Thomas Moore

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California

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You are correct. If you over tighten the set screw, you run the risk of the pin breaking under stress. All you need to do is snug the set screw up to the pin and voila

Thomas Moore Team Avant Team Edge

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01-20-2010 09:42 AM  8 years agoPost 3
Blax1

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Sydney Australia

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Thank you Thomas
Has anyone worked out a torque setting in inch pounds for example, I believe this would take the guess work out of it.

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01-20-2010 02:40 PM  8 years agoPost 4
John Benario

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Las Vegas

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Grind a flat on the pin and then just snug the setscrew with 290. All there is to it.

John Benario

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

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01-21-2010 04:17 AM  8 years agoPost 5
Jody

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Australia

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Great responses the flat takes all the tightening issues out of it with the loctite holding the grub screw.

Ralph maybe 20-30 inch lbs?

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01-21-2010 05:25 AM  8 years agoPost 6
Blax1

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Sydney Australia

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Ok well thank you everyone.

I'll grind the pin and blue loctite again.

At least the flat spot will give the grub screw something better to apply friction too and the edges will stop any sideways movement etc.

Are you grinding flats? Jody.

Anyone know if the AA90E will be any different in main gear drive locking devices?

Onward and into the future, with knee's shaking...........

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01-21-2010 01:44 PM  8 years agoPost 7
John Benario

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Las Vegas

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Blax, The blue loctite, 242, is not recommended. Use the green 290. Much more effective.

John Benario

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

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01-21-2010 03:20 PM  8 years agoPost 8
Daniel Jetschin

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Germany

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Hi,

You can go either way. Flat spot on the pin, or loctite on the pin itself. Either way, blue loctite will be so enough. Everytime I loosen this cupscrew, I need to grab the head and use a piece of tubing on the hex driver to get enough torque to open it And I just snug it with loctite after cleaning again. Green or red loctite will give you a hard time seperating everything again.

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01-21-2010 10:34 PM  8 years agoPost 9
Blax1

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Sydney Australia

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I have 243 Blue loctite, I will continue using that, the grub screw was very tight to remove as well even though the pin had gone south..

Be a while before she's back up, waiting on parts, should be here next week.

Cheers and thanks

Ralph

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01-21-2010 11:34 PM  8 years agoPost 10
Thomas Moore

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California

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It's good to hear you'll be back in the air.

Thomas.

Thomas Moore Team Avant Team Edge

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02-09-2010 01:07 AM  8 years agoPost 11
brgsstm

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Cheshire, U.K.

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Just dont over tighten the pin. Snug it, that's all that is needed. I overtightned mine once and it broke. Follow the manual and you cant go wrong

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02-11-2010 06:24 PM  8 years agoPost 12
fast88lx

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NY

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has anyone drilled it out and put a screw and nut in

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02-11-2010 07:44 PM  8 years agoPost 13
brgsstm

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Cheshire, U.K.

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has anyone drilled it out and put a screw and nut in
Yes, someone over on the Avant forums did that.

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