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Other › Mainshaft may not have any endplay - where to put shims
05-15-2011 02:53 AM  7 years agoPost 1
FLAP

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Michigan

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On page 9 of the Maxi Joker 2 manual, it says in the upper right hand side of the page, " Mainshaft may not haver any endplay! Eventually use shims 10x16x0.1/0.2"

the shims obviously go on the mainshaft somewhere. Right now, I can move the main gear up and down (freeplay) almost 1mm. Since the mainshaft is attached to this, I guess this is the endplay they are telling me to get rid of.

Do I put the shims under the maingear, on the mainsaft between the bearing it sits in? Or, is there another way to get rid of all the endplay?

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05-15-2011 03:52 AM  7 years agoPost 2
FLAP

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Michigan

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Maybe this will help explain what I am experiencing: When assembled per instructions, I can move gear #409 up and down about 1 mm. The bearing in the photo is 'extra' I have no idea where it is supposed to go and it's not bearing 72 in photo of instructions. Also, part 434 is a sleeve that goes over the main shaft (pt 470) As I have assembled it, it doesn't do anything as it just floats up and down (10mm +)without contacting anything. Obviously, I've done some thing wrong. Part 434 must be a spacer for something. It should not just float up and down the main shaft.

The bird was an AP bird, so I'm thinking maybe the extra bearing in the photo was sent with the bird for extra head loading...but, no instructions on where it goes.

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05-15-2011 06:37 PM  7 years agoPost 3
tabbytabb

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seattle

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The extra bearing is a thrust bearing. It goes underneath the top bearing block with the wider side of the bearing sitting up against the top mainshaft bearing block.

This should solve your spacing problems

Tabb

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05-15-2011 07:22 PM  7 years agoPost 4
FLAP

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Michigan

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Thankyou

Please excuse the poor quality of my cellphone photo, but hopefully this helps someone else who can't figure things out without instructions.

Tabb's solution worked. Oddly enough, I think I attempted every other possible configuration with this bearing and the other parts and this was probably the only one I didn't try. Murphy's law I guess.

Thanks very much Tabb

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07-19-2011 01:54 AM  7 years agoPost 5
FLAP

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Michigan

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this is a new one on me - Joker veteran help please
Put the 8th flight on this bird today. This flight and all previous flights were without incident, everything appeared very smooth.
Did my post flight inspection and noticed alot of end play on the head (could pull main shaft up and down) I didn't have before. Went to carry the helicopter back into the house and heard something dropping on the garage floor; little tiny ball bearings.

Took head off and inspected things. The little thrust bearing part in the 2nd frame above was gone. Not just the bearings, the entire brass(?) bearing cage in the center of the 3 parts. No bearing cage or bearings, just the steel outer bearing races were left!

Obviously, something I did wrong, but never had that happen before. Incorrectly shimmed??? Shims are the only way to adjust the play out, right? Nothing in instructions on where to place shims, do they go under the main gear where the shaft goes into the bottom bearing?

Anyone have a clue how this can happen other than not shimmed correctly?

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07-19-2011 05:32 AM  7 years agoPost 6
Gerd

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Vellmar/Germany

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?? Perhaps the cage was not good. Send me your address, we send a new one.

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07-19-2011 12:50 PM  7 years agoPost 7
FLAP

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Michigan

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Gerd, thanks very much. I PM'd you my address.
I would still like to know if the shims go directly under the main gear. I am virtually certain that I put them there and had taken out all the lash (play on mainshaft up and down movement). That is the correct procedure isn't it? One isn't supposed to leave any play for expansion or anything like that, are they?

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07-23-2011 07:27 PM  7 years agoPost 8
FLAP

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Michigan

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Thanks Gerd
Gerd,
I received the two complete thrust bearings. Thank you very much for the quick service and the no charge for parts.

I have reassembled the head, same as original photos I posted. Only this time, I put in the 0.2 mm shim.....under the little 51.5 mm aluminum spacer shaft, and above the main gear. I guess that works as well as anywhere else. Probably could have put it under the maingear as well. There now is absolutely no (zero) end play on the main shaft.

Hopefully, this will sort out the issue.

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