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Other › I should know better by now...............L400 question
04-30-2010 06:10 PM  8 years agoPost 1
Frank Bostwick

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Cincinnati Ohio

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I really should not be having this problem but since after over 250 flights I have had the head apart 1-2 times I just dont know.

See the pics. Both show the feathering shaft with only the thrust bearings installed. One has the end washer that came off it. the end washer in this pic does NOT fit over the minor dia. on the shaft. The thrust bearings or new out of the mikado pack. You can see, assembled and tight, a gap remains that would let the assembly move to and fro.

The other pic is with a washer that does fit over the minor dia. If you assemble the head this way the shaft is too short.

I cant see how either is correct.......What am I missing?

RIP ROMAN

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04-30-2010 07:30 PM  8 years agoPost 2
Frank Bostwick

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Cincinnati Ohio

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Or in other words
Does your end washer fit over the minor diameter of the feathering shaft or not.

RIP ROMAN

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04-30-2010 08:17 PM  8 years agoPost 3
jzeller

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Victoria, MN - USA

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There should be a small gap there. That inner race needs to rotate relative to the shaft, so it can't contact the shaft. It presses up against the outer race of the radial bearing which tightens everything up. So, the end washer should not fit over the shaft.

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04-30-2010 08:28 PM  8 years agoPost 4
dahld

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Bakersfield, CA, USA

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The picture on the right is correct. Both races of the thrust bearing should slip over the step on the shaft. The larger ID on the inside, and the smaller ID on the outside...but the smaller ID should still slide onto the step of the shaft...but the fit is very close.

If you have over-tightened the bolts on the shaft in the past, it can "flare" the end of the shaft slightly, making getting the outer race to slide on difficult. Dress the end of the shaft with a file if necessary to get the race to slide on.

Dave

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04-30-2010 08:53 PM  8 years agoPost 5
Bannon05

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Mason, Ohio

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Logo 400 Main Rotor Grips
FBoss,
Or in other words
Does your end washer fit over the minor diameter of the feathering shaft or not.
I believe the answer to your question is no, please see the picture taken from the Logo 400 manual.

Additionally, it appears you are missing the washer (part #2351) that goes between the thrust bearing and the inner blade grip bearing.

Regards,
Bannon05

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04-30-2010 10:06 PM  8 years agoPost 6
Frank Bostwick

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Cincinnati Ohio

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Thanks for the replies guys. Yes I think the pic that has the washer that fits the minor dia is right.
I was working off the same pic posted. The listed missing washer goes in the blade grip seated against the bearing, I got it but thanks.

When I (assemble the complete head w/ grips etc.) The whole thing is too short. When/if I compressit all the blade grips contact the head block, as you know that just aint gonna work! Could be the washers I dug up are too thick.....

Going back to the shop here in 30min to try again.

RIP ROMAN

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04-30-2010 10:39 PM  8 years agoPost 7
Bannon05

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Mason, Ohio

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Washer thickness...
I do not know what the washer thickness measurement is on the Logo 400, but on a Logo 500 the measurement is just shy of 1 millimeter.

Dave

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04-30-2010 11:24 PM  8 years agoPost 8
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Im sure to be corrected if wrong but Im pretty sure except for blade grips the 400 and 500 are the same. Off to the shop now, give this another go. Need to get it done as I have another heli asking for attention.

RIP ROMAN

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05-01-2010 12:59 AM  8 years agoPost 9
Frank Bostwick

rrElite Veteran

Cincinnati Ohio

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Follow up: Head is assembled. Found washers between dampers and inboard grip bearing, too thin. Used washers from a new pack of hard dampers and it went together fine. Also used washers that fit minor Dia. (which should have been on there 25o flights ago).

Ill say this, if I torque down enough, I can lock the grips up. They are tight and free now, but they should not be able to bind the grips. The thickness of the T/B assembly and the washer, equals the Minor dia. length. So the Screw should contact the face of the minor Dia. and stop. the complete assembly should not be able to get any, "shorter" or compress further. Im thinking I need to add some thin washers at the dampers....

As it is I consider it RTF. Ill finish the rebuild in the morning.

Comments welcome and thanks for the input.

RIP ROMAN

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05-01-2010 02:10 AM  8 years agoPost 10
gian

rrVeteran

AZ

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Pretty sure you'll find that you can always get the grips to bind on the yoke... unless you're using some wicked hard dampers.

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