100 Hrs Lubrication

[Janat83]

Hello Mooniacs

My 68 M20C will require to comply with 100hrs lubrication AD-73-21-01 in few hours, my mechanic asked me to bring the lubricants and he'll show me how to do it, I got lost on many items, Aircraft Spruce didn't help they couldn't match the MIL code with their stock, I have read the famous "Let's talk lubrication" thread and I got lost even more, I don't want to mix different Grease or use inappropriate lubricants, could you guys guide me on this issue! or what do you guys use on your own airplane! 

Thanks in Advance

Moustafa Janat

[Hank]

Your prop should have a sticker under the spinner, always refill with the same. Mine is #5, but yours could easily be #6.

I use #22 for the landing gear and jack screw.

And lots of Tri-Flow where things move and pass through guideblocks . . . .

Don't forget wheel grease, too.

[smwash02]

I've attached the sheet I made for doing mine. The symbols are different, but you should be able to line them up for most of them. I had made a sheet for my C, but I seem to have misplaced it.

You'll have to pull your spinner to see which grease to use on your prop.

M20K Lubrication.pdf

Edited November 5, 2020 by smwash02

[Don Heene]

Try this MIL Spec Sheet Cross Reference Mil Spec Sheet.pdf

[MikeOH]

Looks like Aeroshell 6 is a substitute for the obsolete MIL-G-7711:

 

[PT20J]

Here's what I use:

Landing gear/flap actuator ball screws -- Lubriplate 630-AA

Landing gear zerks -- Aeroshell 22

Control guide blocks -- Aeroshell 7

Trim screws -- Aeroshell 7

Wheel bearings -- Mobil SHC 100

Rod ends -- Triflow

Control bearings, u-joints, trim chain -- LPS 2

[EricJ]

Cut-and-pasted from my one-note notes for my M20J.  SMM for M20C may differ slightly.:
 

Mooney lubrication notes, by eaj, 8/22/2020.   See M20J SMM Section 5-20-7 P 18-20.

Order:  Lube items, manual symbol, specification, compliant products.

Landing Gear Zerks, W, MIL-G-81322, superceded by MIL-PRF-81322.   Mobil Grease 28 or Aeroshell 22

Rod ends, y, Teflon (PTFE), Tri-Flow specified.

Bellcranks, u-joints, bungee/spring attachments, flap indicator cable, fuel selector valve, baggage and cabin door hinges, control surface hinges, S, MIL-L-7870, superceded by MIL-PRF-7870C (or latest).  Low-temp general purpose light oil.   Suggested is 3-in-1, LPS 2.

Stabilizer trim jackscrew/actuator, chain and gear, j, specified Aeroshell 7

Wheel Bearings, Y, MIL-L-3545, superceded by MIL-PRF-81322G (or latest), Aeroshell 22 or Mobil SHC 100

Control rod guide blocks, D, MIL-G-23827 or MIL-G-3278, superceded by MIL-PRF-23827,  Aeroshell 7 or Aeroshell 33   (NOTE:  Aeroshell 7 and Aeroshell 33 are not compatible with each other, do not mix.)

Gear or flap actuator gear box, W, MIL-G-81322 superceded by MIL-PRF-81322,  Aeroshell 22 or Mobil SHC 100

NOTE:  SBM20-190B for Dukes/ITT gear actuator gearbox indicates Aeroshell 7, or MIL-PRF-23827 with 10% by vol molybdenum disfulfide.

Gear or flap actuator Ball screw, ë, specified Lubriplate 630AA

Door latches, , Door Ease Stick Lubricant

Note:  Aeroshell 22 covers most grease requirements, and cannot be mixed with Aeroshell 5
Note:  Aeroshell 7 (trim, guide blocks), and Lubriplate 630AA (ball screws) covers the rest of the grease requirements.

Spec status here:  http://everyspec.com/categories/lubrication/

Aeroshell compatibility notes here:  https://www.shell.com/business-customers/aviation/aeroshell/knowledge-centre/the-aeroshell-book/_jcr_content/par/textimage_1433441235.stream/1519764636322/2450d6be71ecb544ed66e557f856b8e59a15ae28/aeroshell-book-5greases.pdf

Aeroshell online book:  https://www.shell.com/business-customers/aviation/aeroshell/knowledge-centre/the-aeroshell-book.html

[PT20J]

A couple of fine points.

Grease is just oil and a thickener. Oils can be mineral based or synthetic. Thickeners are generally clay or metallic soap (most common is Lithium). Because of differences in component materials, some greases are incompatible and degrade when mixed. So, it is best to stick with one type of grease for each application and record what was used. If you don’t know what was used previously, all the old grease should be removed before applying new grease. One point of confusion is the MIL-PRF-23827 specifies a type I and a type II which are not compatible.

Aeroshell 22 can be used for wheel bearings. Many mechanics use Aeroshell 5. Parker (Cleveland) now recommends Mobile SHC 100.

The lube chart indicates grease for the trim chain. This makes no sense because grease won’t get down into the chain rollers which are the wear points. I just use 3-in-1 oil.

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