October 14, 2019 at 4:43 pm #1830
It’s time to replace all of the O-rings/seals in all five of my hydraulic actuators. Unfortunately, my Parts Manual and CD are not readily available. Does anyone know the type and quantity of the seals for each of the actuators, and also the thread size for the fittings as I want to get plugs to seal the lines while the cylinders are removed.
Appreciate any information our members can provide!
N2919TOctober 19, 2019 at 10:18 pm #1833
I found an eCopy of the parts manual in my files and it lists the part numbers/sizes of the seals for all of the actuators except the step actuator. Does anyone have information on the step actuator?
VR, TomOctober 21, 2019 at 11:07 am #1834
Tom, my A&P rebuilt the step and as I recall, just took it apart and cleaned and sized and replaced the o rings.February 6, 2020 at 4:27 am #1872Robert WhitfieldParticipant
If you have a copy of parts numbers and sizes for actuator and strut seals i would like a copy before i start the repair. 200D SN 343 thanks Robert WhitfrieldFebruary 7, 2020 at 2:47 am #1873
I do have the part numbers and quantities required and multiple extra seals since I was sent a duplicate order. However, I am currently on an extended work trip and do not have access to my data or parts at this time. If you are able to wait until mid-March, I will send you a complete set of seals (or just the part numbers) at no cost. They have a shelf life and need to be used or eventually discarded.
If you contact me via text on my phone, I’ll advise when I return home and will forward the seals.
VR, TomFebruary 7, 2020 at 3:35 pm #1874Ashley WadeParticipant
Hey Tom! Hope all is well at Honeapath. My A&P did the same as Ed’s and it has worked flawlessly for 4 years. The prior owner and I were plagued by our step. At one point before I purchased the plane the step actuator was disconnected and the door sealed up. That A&P recommended that it not be repaired. I bought the plane with the step inop. I don’t like stuff not working on my plane. Former owner had had the actuator rebuilt at a hydraulic shop and it was in a box. They even resurfaced the piston rod but never installed. I had my A&P install it. Went out to hangar one morning a few months later to a stinky red puddle under my girl. A&P questioned that there might still be a bad spot on the piston rod after resurfacing and adjusted the throw of the rod so that it would land at a different spot. Great thought for others to consider, but on mine it was only another few months until I got a second nasty puddle. A&P ripped it apart for rebuild and 4 years later still working great. I helped him and it took us about 15 mins to change out the o rings.
Was having so much trouble prior to rebuild that I did a lot of research. Found that our M200 step actuator is also used as the master brake cylinders of certain Beech Bonanzas. They had some new ones available through beech, but would require a loan from the bank to purchase. I located a couple of used ones on eBay that I was going to have rebuilt. Didn’t ever pull trigger since working now. (hopefully didn’t just jinx my plane) If someone’s rebuild does not work I could try to go and find my old research data and locate a core for them. The ones I found were “removed working” and were like $200.00. You don’t want to know the new Beech price. Good luck.February 10, 2020 at 7:33 pm #1875
Great commentary Ashley. I think one of the reasons why my A&P was successful first time (watch-now I will jinx myself) is he was a BIG go-to Bonanza guy here in NC. I am sure that probably factored in.
I am having a blast right now trying to trouble shoot a fuel flow problem on a 180 hours SFREMAN engine. Found fuel pump full of crap and still not right. He is now looking into the throttle body and spider. All fuel hoses replaced at OH as well…ahhh, the joys of ownership…April 10, 2020 at 3:34 am #1901Robert WhitfieldParticipant
Just checking in to see if you are back in the states. I am still interested in the seals. You can e mail me at firstname.lastname@example.org how to get in contact with you. Thanks.August 19, 2021 at 6:26 pm #2323GaryParticipant
Can anyone send me the part number or sizes of gear actuators seals, looks like Robert Whitfield might be a good source. Any help is appreciated, Gary List. Myers 200D #370. email email@example.comAugust 20, 2021 at 1:26 am #2324
Gary-my step spit the bit again last year when it was in annual! If your A&P is pretty resourceful, I suggest you pull the step and get into the guts and look at the O rings. They are all in stock, you just need to make sure you source the right diameter. It might take some trial and error as I found out last year getting in his way…
EdAugust 20, 2021 at 2:25 am #2325
I am currently on vacation and won’t be at my hangar until Labor Day weekend. I sent Robert Whitfield a complete set of seals, so he should have the part numbers. All are common O-rings available thru Aircraft Spruce, except the internal gear handle valve and flap selector valve. I found a compatible seal at McMaster Carr that is working fine in these selectors.
I will also reach out to Jim Jones to see if he can send the numbers from our records.
VR, TomAugust 21, 2021 at 1:22 pm #2326
Here are the O-ring part numbers for each of the M200 gear and the flap actuators:
3 each AN6227B-17 (MS28775-212)
1 each AN6227B-10 (MS28775-112)
The flap and landing gear selector valve use the following seals
2 each MS2775-117
1 each 1161N52-204 [8-point seal 70 DURA Buna N from McMaster-Carr]. (They also have a reinforced high pressure double O-ring type seal, but it is a harder rubber and more difficult to install)
The AN/MS O-rings are available from Aircraft Spruce. I recommend ordering a few extra of each so you have spares in case one gets nicked or cut during installation.
The step actuator has a Beech aircraft brake cylinder part number. But I don’t recall the O-rings required for it. Access to it is best achieved by lifting the rear seat/cargo floor deck.
Hope this helps,
VR, Tom ThibodeauAugust 22, 2021 at 12:17 pm #2327
The high pressure seal double seal I mentioned above is actually called an O-ring loaded U-cup seal. It is a harder rubber up with a softer O-ring inserted to push the cup against the shaft. The McMaster part number is 9505K15. I believe this is the seal that was in my flap selector and gear valves, but the harder rubber cup was extremely deteriorated (basically sediment). I went with the 8 point seal because it is the same compound as the AN/MS O-rings and provides a leakproof seal.
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