Main gear retraction pivot

[Nukemzzz]

Hey guys,

So during the annual we spotted a pivot that has a little bit of play in it. The bolt seems to wiggle a little as well. 
 

I’ve not been able to find an exploded view of this pivot joint, but I suspect there is a bushing inside and there must be spacer sleeve on this bolt (or it’s a shoulder bolt) so it can be torqued and the mechanism still pivots. I also suspect that the bolt is just threaded into that backing plate. 

Does this sound about right?  We are probably going to take it apart and inspect Does anyone have any experience with this pivot joint?  Came across an exploded view?  Standard torque for the fastener size and type(I’m not finding a torque in the vintage manual)?  
 

 

[N201MKTurbo]

I’ve found the bolts ware more than the bushings. Bolts are cheap.

[PT20J]

Here’s a picture for a M20J. Probably similar.

[Utah20Gflyer]

There is a bolt, a bushing and the retraction truss.  The bolt is a couple dollars, the bushing is about 30 dollars.  Lasar should have them. I just replaced all of those bushings and bolts, etc about a month ago.  

[Nukemzzz]

Thanks guys. Will take a closer look now. 

[Jsno]

Its in the IPC: Bushing Part Number is 914020-17, Bolt AN26-17, 2 each Washers AN960-616, Nut AN320-6, Cotter Pin AN320-3-3.

[Guest]

On 2/6/2022 at 12:14 PM, Nukemzzz said:

Thanks guys. Will take a closer look now. 

This might help.  The parts are listed under item 17.  Bolt 17 screws into an anchor nut on the spar and is safety wired to #14

Clarence

[47U]

On 2/4/2022 at 7:10 PM, Nukemzzz said:

Does this sound about right?  

At my first annual all gear torque values were all low.  After I got them in spec, my main gear doors weren’t flush to the wing.  I looked for slop in the retraction system and called Dan at LASAR with a list of prospective part numbers.  He sent me the collection below, which set me back about .3 amu… that was in 2013.

[Vance Harral]

I went through a similar exercise a few years ago.  You might find this thread I posted at the time helpful:

 

 

[Vance Harral]

A neuron fired, and I remembered the one other thing I wanted to contribute to this thread.

The IPC specs ordinary AN hardware for the landing gear side brace bolts; but AD 78-15-02 requires following the instructions in SB M20-212 to replace those with NAS 1306 high strength bolts, see https://www.mooney.com/wp-content/uploads/2020/12/SBM20-212.pdf.

If you're ordering new hardware for these bolts, order the NAS 1306 hardware, not the AN hardware spec'd in the IPC.  If you order your hardware from LASAR, they'll likely send the correct hardware.  If you're just ordering from Aircraft Spruce based on the IPC, you can wind up accidentally un-doing an AD.

[carusoam]

Great neurons Vance!

Thanks for the added details!

Best regards,

-a-

[Nukemzzz]

Oh wow. Great info guys. Thanks so much. 
 

[Nukemzzz]

Interesting... that AD and SB only applies to the F and J models.  Means i shouldn't bother or can't do it?  (Mine is an M20E)

[Vance Harral]

34 minutes ago, Nukemzzz said:

Interesting... that AD and SB only applies to the F and J models.  Means i shouldn't bother or can't do it?

I hadn't realized the SB was only applicable to F and J models.  My guess is that's due to the higher gross weight of 2740 lbs in the F/J, vs. the 2575 lb gross of the C/D/E.  Higher weights put more force on the gear.