Brake line swivel fix

[Skymaster337B]

My brake line swivel on the landing gear was leaking. The Cessna part was close to $500 new. So I got some advice from folks on this web site to just replace the O-rings on it. Well I did, and it works! So I just wanted to share.

After removing the swivel fitting from aircraft, you'll need to tap out the 3 roll pins holding the fitting together. Then, stick something small into the hole on the side of the fitting to push out the snap ring (it took me a while to realize there was a snap ring holding the thing together since it's hard to see--so I hope this saved you the same pain). Then simply pull the fittings apart. There's a small O-ring inside, I replaced it with: MS28775-010, be sure to lube it up alittle before sticking it back in. Then I replaced the larger O-ring that plugs into the landing gear block with MS28775-110, again lubing it up before sticking it in. Then put the fitting all back together and re-install part.

My total cost $0.75, including tax, that's right 75 cents (I saved over 50,000%).

Don't forget to bleed the brakes when you're done.

Let me know if this helped you.

[Randy Mulkey]

Thanks so much Skymaster337B, your post was very helpful. I discovered that I mistakenly thought you were saying to push out the snap ring from the "hole" in the end that fluid goes thru. NOW, I understand that there is an additional hole on the "side" of the fitting just as you stated. It is just below the holes for the roll pins. It is a hole that is in the middle of the groove for the snap ring. Perhaps my post here might help someone else that don't read English that well. lol

[Burt]

Thank you so much. I think I can do that.

[Joes]

Thanks a bunches, paid 300+ to have one rebuilt 6 years ago.

[mshac]

While its truly nice to see everyone express their gratitude to the OP, do you guys realize this post is 17 years old???

There is another post thread that has pics of the disassembled swivel, roll pins, etc. If someone can locate it, post the link in here please.

EDIT: Found the pics, they are on the 337 FB group (one of them): https://www.facebook.com/groups/2872...W3g&_rdr<br />

[Burt]

That picture of all the swivel parts is very illuminating. I am not a FB user so had never seen it. Even though I have always been very mechanically inclined have considerable experience with mechanical (as well as electrical) devices, I have been unable to get the snap ring out and do not want to destroy the assembly in the process. So I ordered a repaired one from Commodore at $300 exchange, which is far less than other sources.

[mshac]

Based on what some others have reported paying, you did pretty well at $300.

Like you, I also have a electro-mechanical background, and usually have success "figuring it out as I go", but without an explosion diagram or similar, that swivel fitting is a tough nut to crack!

*I posted the photo from FB below so we will always have it here, even if the post is removed from FB for any reason.

[wslade2]

Good idea posting the photo

Note, in the photo, snap ring is broken, therefore not available for reuse.

When I did my swivels because they were leaking I had read about the self service on the other posts. So, I gave it a try. Like everyone else here, I do a fair amount of mechanical stuff and not much stops me. However, likewise, attempts at getting the retainer out quickly appeared like it was going to induce damage. Further, mine didn't seem to have a simple snap ring like the picture but some type of retaining collar (like a speed nut clip). It was clear it would come out bent and un-useable.

These swivels are un-obtainium. My suspicion was the retainer would be hard and time consuming to source if damaged, perhaps unobtainable or worse I would damage/score the swivel leading to permanent leakage despite new o-rings. So I sought a professional/someone who does it all the time. I have posted this before, but Robair Repair in Silverdale WA rebuilds these swivels and pressure tests them before returning. Got both of mine done and no leaks since. You can see their ad in Cessna Pilots Association magazine.

[Burt]

While waiting for the swivel to arrive that I ordered a few days ago, I continued to play with my old one and finally succeeded in getting the snap ring out without damaging anything. So if and when my other one starts to leak, I should be able to fix it myself.
Oh well, lesson learned.

[Joes]

would this work ....
https://shop.hoseandfittings.com/cat.../2403-SVS.html

i realize its just a single plane swivel, just wondering
Joe S

[mshac]

Originally Posted by Joes

would this work ....
https://shop.hoseandfittings.com/cat.../2403-SVS.html

i realize its just a single plane swivel, just wondering
Joe S

I don't see why it wouldn't work as long as the threads are correct.

[Joes]

Attached are some photos of swivel components and tools used in the rebuilding. Joes

[Dan schultz]

I have two swivels out of my parts plane

[mshac]

Looks like with the right parts and tools, you could rebuild one of these in under 15 minutes!

[Joes]

Forgot to mention the vise jaws I used.
ATLIN Vise Jaws 6" - Nylon, Non Marring Soft Jaws - Multi-Purpose Design for Woodworking, Jewelry Making, Plumbing