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M20C Landing Gear kickback


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My landing gear springs back about 1/4" after full down. Anyone seen this and know what causes it? My A&P brought in an expert and they re-rigged everything but it still does it. The current thought is that the actuator may need replacing or the gears. Looking for your experiences.  Thanks.

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45 minutes ago, Tcraft938 said:

I'm not sure if this will help you, but here is a gear swing video on youtube.  There are many others to chose from as well.    Best of luck with it, I hope it works out for the better.

 

Yep, that's mine from 2 years ago. My now retired IA is short and had a hard time reaching the switch from outside.

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The video below shows the gear retraction and extension.  It's kind of hard to see in this video but it's a lot more pronounced than the videos above.  I will post a video of the gear motor next and you'll really see what I mean.  It's that last second where the gear motor actually reverses.

https://youtu.be/nw9rYPy7LZo

Edited by Paul - M20C
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On 1/12/2020 at 12:26 PM, Paul - M20C said:

My landing gear springs back about 1/4" after full down. Anyone seen this and know what causes it? My A&P brought in an expert and they re-rigged everything but it still does it. The current thought is that the actuator may need replacing or the gears. Looking for your experiences.  Thanks.

There are a number of crucial service bulletins on your gear transmission.  They are free on www.mooney.com Best to familiarize your self with them.

The 20:1 gears in your transmission are subject to wear when not greased properly.


Clarence

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In the video it is back driving the actuator. How are your preloads after it back drives? How do your spring compressions look? I have a feeling you are overdriving the gear, but I can't tell unless I'm there. 

If you use the crank until the light comes on does it want to back drive? Does it get hard at the end?

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This almost kind of reminds me of an issue I had 25 years ago with my first M20C with electric gear.  I called up Dugosh and spoke with the owner at that time, Ronnie.  He said that the tensioner/friction springs inside the motor were old and no longer holding the motor from spinning when the motor wasn't energized.  

I took my motor to him, he disassembled it and installed 2 standard AN 960-10 washers as shims to make up for the springs that had lost some of their tension.  Worked great.  And he wouldn't let me pay him.  He was a great guy, hope the new Dugosh owners are similar.

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  • 3 years later...

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