Dukes Gear Actuator Gears

[vik]

  On 8/13/2021 at 6:48 PM, tony said:

why isn't the grease black?  I think you're using the wrong grease.  

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As I mentioned, the grease is not black because the IA who did last several annuals did not comply with AD.

[Bob R]

  On 8/14/2021 at 4:43 PM, vik said:

As I mentioned, the grease is not black because the IA who did last several annuals did not comply with AD.

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Does anyone know the correct grease for the actuator gears? I understand it needs 10% molybdenum but someone must make a tube for a grease gun.

Thx!!

[Mooneymite]

  On 8/14/2021 at 8:30 PM, Bob R said:

Does anyone know the correct grease for the actuator gears? I understand it needs 10% molybdenum but someone must make a tube for a grease gun.

Thx!!

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From the SERVICE BULLETIN M20-190B:

INTRODUCTION: In order to check gear teeth wear, assure proper lubrication and prevent Heim bearing seizure, comply with Instructions below. Access to the actuator is gained by removal of the fuselage belly plate, P/N 310124. In lubricating the actuator gear housing use only Dukes Astronautics Co.; special purpose grease P/N 2196-74-1, Aeroshell Grease # 7, or MIL-PRF-23827 (with a minimum of 10% (by vol.) Molybdenum Disulfide added to any of the grease used).

Edited August 14, 2021 by Mooneymite

[PT20J]

  On 8/14/2021 at 8:30 PM, Bob R said:

Does anyone know the correct grease for the actuator gears? I understand it needs 10% molybdenum but someone must make a tube for a grease gun.

Thx!!

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Last time I looked, the highest moly content commercially available grease was 5%. LASAR used to sell small containers of it that they mixed up. 

Skip

[Bartman]

I bought a small container of properly mixed grease with 10% molybdenum from LASAR. Their website may say “Sold Out” but just call them and tell the what you need. 
 

Don’t get it on any clothing you want to wear again. 

[Mooneymite]

https://www.ebay.com/itm/222011563696?epid=1144097442&hash=item33b0eb9eb0:g:BXoAAOSwYHxWPoU9

 

It's kind of messy, but mix it yourself.

I've had good luck putting the mixture in a plastic syringe instead of a grease gun to fill the mechanism.  I just remove the grease nipple to use the syringe.  Once full, you can replace the grease nipple and "top it off".

If you find a neater, cleaner more efficient method let me know.

 

 

 

Edited August 14, 2021 by Mooneymite

[N201MKTurbo]

  On 8/14/2021 at 8:30 PM, Bob R said:

Does anyone know the correct grease for the actuator gears? I understand it needs 10% molybdenum but someone must make a tube for a grease gun.

Thx!!

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I buy the moly powder from a company called Rose Mill. Then I bought a small grease gun and filled it with the grease mixture. I keep it in a plastic bag. There is enough grease to last me 20 years and I have enough moly powder to make about 4 more batches. I hope I live long enough to use it all.

https://rosemill.com/product/molybdenum-disulfide-technical-fine/

[apriav]

Aeroshell 7 is available.

[Guest]

Mooney provides the recipe in SB 190.

https://www.mooney.com/wp-content/uploads/2020/12/SBM20-190B.pdf
 

Clarence

[Bob R]

Hey All,

I think I’m gonna bite the bullet and make the actuator gear change to the 40:1 set. Has anyone purchased these gears lately? If so, do you recall what the cost was? I’m going to call Don Maxwell on Monday but I’m just looking for a heads up.

Thank you.

[EricJ]

  On 8/14/2021 at 10:39 PM, Mooneymite said:

https://www.ebay.com/itm/222011563696?epid=1144097442&hash=item33b0eb9eb0:g:BXoAAOSwYHxWPoU9

It's kind of messy, but mix it yourself.

I've had good luck putting the mixture in a plastic syringe instead of a grease gun to fill the mechanism.  I just remove the grease nipple to use the syringe.  Once full, you can replace the grease nipple and "top it off".

If you find a neater, cleaner more efficient method let me know.

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That's not a bad way to do it.

You can get it on Amazon as well:
https://www.amazon.com/gp/product/B088D58G5X

[MB65E]

I Bought some grease from LASAR this summer.

Less Mess,

-Matt

[Mooneymite]

  On 8/15/2021 at 5:18 PM, MB65E said:

I Bought some grease from LASAR this summer.

Less Mess,

-Matt

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I think Aeroshell 7 only has a 2 year life.  If I mix up a whole tube of it with the molybdenum, there's a ton of waste since I only do the SB every year, or two and it probably only takes a couple of ounces, at most..  By using the plastic syringe I can mix and apply only what I need.  I don't try to save the mixture.

But, it is a messy project...that molybdenum is definitely black.  

Does anyone used the molybdenum mixture in other Aeroshell 7 applications besides the gears?

[jetdriven]

Didnt i read somewhere that Aeroshell 64 is now approved?

[vik]

  On 8/13/2021 at 8:35 PM, M20Doc said:

Make a steel bar with two holes drilled to the same centres as the pin holes, drive two pins through the bar deep enough to engage the holes in the nut.

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"same centers" - that is where I will get in trouble  

[Mooneymite]

  On 8/16/2021 at 3:50 PM, jetdriven said:

Didnt i read somewhere that Aeroshell 64 is now approved?

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I haven't seen that.  According to the write up on Aircraft Spruce, Aeroshell 64 looks like a superior grease, but it only has 5% molybdenum so, even if approved, we still have to add molybdenum to comply with the SB?

[jetdriven]

saw it here. 

 

[N201MKTurbo]

FYI

 

BTW,

My experience is the oil separates from the emulsifier. Just stir it and it is as good as new. This all started about 15 years ago when the military started requiring shelf life's for everything. Some of the vendors didn't have shelf lives for their stuff so they just made everything very short shelf lives until they got more data. Besides, with a short shelf life, they get to sell more stuff.

So, does Mooney require us to change out the grease every 6 years? They have it by hours, not years.

 

Change of AeroShell Grease Shelf Life - June 2020.pdfFetching info...

[tmo]

  On 8/16/2021 at 10:43 PM, N201MKTurbo said:

So, does Mooney require us to change out the grease every 6 years? They have it by hours, not years.

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Isn't the work / maintenance done yearly effectively the work to be done every 100h, regardless of hours flown?

[N201MKTurbo]

  On 8/17/2021 at 10:05 AM, tmo said:

Isn't the work / maintenance done yearly effectively the work to be done every 100h, regardless of hours flown?

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Most places. 
 

The gear actuator requires new grease every 500 hours. The propellor blade bearings on McCauley props is there until it gets overhauled. Quite a few sealed bearings could have very old grease.

[Bob R]

For those that do not know, the Dukes Actuator gear kit is ordered from the following:  SI20-112-001.

[RocketGnome]

  On 8/20/2021 at 9:49 PM, Bob R said:

For those that do not know, the Dukes Actuator gear kit is ordered from the following:  SI20-112-001.

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Do you know of anyone currently selling them?

 

Gnome

[Bob R]

  On 9/16/2021 at 11:31 PM, RocketGnome said:

Do you know of anyone currently selling them?

 

Gnome

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  On 9/16/2021 at 11:31 PM, RocketGnome said:

Do you know of anyone currently selling them?

 

Gnome

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You can get them from any authorized Mooney service center, Lasar, Don Maxwell. Top Gun Aviation, etc. I order mine from Lasar. They just came in yesterday and took about 3 weeks. Currently Mooney does have all the parts so they should come in faster. It takes about 4 hours to get the gears set up in the actuator case. The gear set costs a whopping $1750 for $20 worth of steel of course. At least I won’t have to deal with the AD for 500 hours I guess.

Bob

[RocketGnome]

  On 9/16/2021 at 11:58 PM, Bob R said:

 

You can get them from any authorized Mooney service center, Lasar, Don Maxwell. Top Gun Aviation, etc. I order mine from Lasar. They just came in yesterday and took about 3 weeks. Currently Mooney does have all the parts so they should come in faster. It takes about 4 hours to get the gears set up in the actuator case. The gear set costs a whopping $1750 for $20 worth of steel of course. At least I won’t have to deal with the AD for 500 hours I guess.

Bob

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Thank you Bob, I tried a month or so ago and was told they didn't have any in stock and didn't know when they would have any at both places. I'll call tomorrow!

 

Gnome

[Bob R]

  On 9/17/2021 at 12:19 AM, RocketGnome said:

Thank you Bob, I tried a month or so ago and was told they didn't have any in stock and didn't know when they would have any at both places. I'll call tomorrow!

 

Gnome

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Don’t think anyone stocks them. Mooney puts them together for their dealers when ordered. Get a hold of Dan at Lasar. Maybe he ordered one for stock. Good luck.