Brake line hydraulic swivel

[Burt]

Anyone have information regarding repair or replacement of the main gear brake line hydraulic swivel fitting?

[mshac]

There are posts here showing how to rebuild it yourself for 75 cents. Shows how it comes apart, etc.

here's one, there are others: http://www.337skymaster.com/messages...ghlight=swivel

Use the search function.

[Dan schultz]

Rebuilt my left one last year, put between two pieces of aluminum in vice, remove internal circlip, remove roll pins, take apart, replace oring, reassemble.

Dan

[GAdams]

My brake line swivel has seen better days. Someone previously beat the crap out of it and it is no longer serviceable or repairable. I found a replacement part which is a Phoenix C6-4-6. Cost about $10 plus shipping. Using FAR 43.13 to install. Far better replacement part than the original. Early serial number Skymasters had no brake swivels. I don't know the history on the swivel but I assume it was an improvement done by Service Bulletin in the early days. Then incorporated into later production airplane.

[mshac]

Awesome news brother!

[Dan schultz]

Does that fitting rotate in any direction like the original fitting?

Dan

[mshac]

$8.75 - https://www.aircraftspruce.com/catal...s/04-02145.php

[Dan schultz]

It appears that the fitting is rigid when you tighten it up, if so that is entirely different than the ones in the P models

[wslade2]

This swivel only has rotational movement in one axis. The OEM swivel not only twists on the long axis but flexes angularly all around the compass. It was mentioned that originally earlier models didn’t have it. Probably added to reduce torsional and flexing stresses on the line (which can lead to line failure). This Phenix swivel may not be an acceptable substitute.

However this point doesn’t solve the original problem of a destroyed swivel. I wonder if Robair can do anything to save the original?

My previous search was the OEM are unobtainable at any price.

If you have no option but to try to use this swivel, I would watch the line movement during gear swing to see how things go and be prepared for brake failure in use.

[GAdams]

We did a gear swing with the swivel removed and confirmed there was no interference or stress on the line. The line we have is teflon and the IA would be more comfortable changing the line back to the original material if we were going to eliminate the swivel. I wanted the swivel and so we installed the swivel and confirmed proper operation of the gear with no brake line stress, wear points or interference. The IA is happy and the aircraft has been returned to service.

[Learjetter]

Where is this mystical swivel located on a G model? my parts and service manual google-fu is failing me.

[Rick Erwin]

Learjetter, on a G (P-model) it is visible from the outside of the airplane. Kneel just aft of the landing gear leg and look inboard of the gear leg about 18 inches, or so.

Rick

[wslade2]

Confirming that the substitute swivel by Phenix works is some pretty awesome news. Solves a major conundrum for 337 mankind.

[GAdams]

Hey Skymaster People, After further investigation it has been determined that the aforementioned swivel does not swivel quite enough when tightened down. I owe you all a big APOLOGY. We cannot find a OEM swivel nor a suitable substitute so we are going to install a new teflon/cotton/rubber hose as per the original parts catalog for older 337's and proceed with that fix. We will inspect frequently for wear and report back. Again I jumped the gun from enthusiasm and was too quick to post my findings. So Sorry. BBQ crow tonight for dinner.

[Kim Geyer]

Have any of y’all checked into the swivels from McFarland