Big Lama outer shaft/gear assembly removal/installation

platinum

Big Lama outer shaft/gear assembly removal/installation.

platinum
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/Goal : relaxed flying with the least fixing. Very Happy

1) Remove links and hex screw from the fix collar.

2) Slide fix collar outboard against the swashplate.

3) Push the shaft assembly into the frame to reveal the gear lock screws.

4) Remove the gear lock screws(2) then remove the gear and shaft assembly from the frame.

5)The illustration show the parts arangement of outer shaft assembly.

6) Install upper bearing into the frame then insert the shaft assembly with fix collar to the frame.

7) Install lower bearing and sidestep lushion onto shaft then press into the frame.

8. Install the gear to the shaft end. Align the holes of lock screws to the shaft.

9) Install the gear to the shaft. Tighten the two lock screws.

10) Press the gear agains the frame.
Press the fix collar against the frame then lock with hex screw.
Check freedom of movement and alignment of the shaft.

nick_onelove · Posted: Thu Jul 28, 2011 8:58 am Post subject:

Very informative platinum, thanks for sharing.

Looks very similar to the CX3.

St Bosse · Hopping Maniac Joined: 06 Sep 2011 Posts: 24 Location: RSA

Hi Platinum,

Thanks for the explanation. Did a complete overhaul of my Big Lama chassis after a blade strike crash.

Question: How the hell do you get the gear "B" on the new outer shaft without hitting (ok, tapping) it with a hammer ? Sad

Is there some sort of a special trick ? To me, using a hammer is not acceptable Mad

platinum · Posted: Thu Sep 22, 2011 6:41 am Post subject:

carr52 · Posted: Thu Jul 05, 2012 9:18 am Post subject:

If you can expose the spot where the set screw was tightened against the shaft then what I did was use a very fine diamond file to smooth it out. Then once I did get it apart I used 12000 grit sand paper to polish. Thats right 12000. I use it to polish plastic after I turn it on the lathe. Makes it clear as glass. Anyways its hard to get the parts off cause they tightened the screws way too much at the factory. I had to just keep turning the gear and shaft back and forth till it finally smoothed out enough to come off then I polished it and replaced. All the set screws are like that.

Tom

carr52 · Posted: Sat Jul 07, 2012 8:01 pm Post subject:

The inner shaft B set. The part that holds the blade grips for the lower rotors. Don't know why its called that since its on the larger outer shaft. Anyways on my Lama the two tiny screws that hold it in place stripped out so I just replaced it. Took it out for a spin late last evening. No wind and just a beautiful night. The problem of the heli tourqe to the right was solved. I thought it was a motor problem.

Tom