|
Joined: Nov 2007
Posts: 6,964
Campfire Tracker
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 6,964 |
My New Holland tractor has hydraulic fittings that keep destroying o-rings. They are straight male thread with a jam nut that tightens up the o-ring. Like this; https://www.agrisupply.com/1-2-male...msclkid=a648cd7d9b571d662c68ac7f51cbe67dThe other end of the fitting is JIC. II have worked with these in the past, and really didn’t have a problem with blowing o-rings. Whenever I removed one of these fittings I would always screw them in till the o-ring seats on the fitting and the threaded port matched up making an even V. There’s one fitting, the rod end of the loader boom/arm cylinder that’s mostly the problem. Is there something that’s wrong with my setup method that would cause premature o-ring failure? I guess I could go shopping for and o-ring with a larger thickness to take up more room under the jam washer.
Mark
NRA Life Member Anytime anyone kicks cancers azz is a good day!
~Molɔ̀ːn Labé Skýla~
Oh The Drama!
|
|
|
|
Joined: Sep 2011
Posts: 61,039 Likes: 18
Campfire Kahuna
|
Campfire Kahuna
Joined: Sep 2011
Posts: 61,039 Likes: 18 |
can you ask the local dealer's shop foreman about it?
These premises insured by a Sheltie in Training ,--- and Cooey.o "May the Good Lord take a likin' to you"
|
|
|
|
Joined: Feb 2009
Posts: 11,920
Campfire Outfitter
|
Campfire Outfitter
Joined: Feb 2009
Posts: 11,920 |
Might screw them down some more then tighten the jam nut.
I believe that it will last longer.
|
|
|
|
Joined: Oct 2014
Posts: 871
Campfire Regular
|
Campfire Regular
Joined: Oct 2014
Posts: 871 |
That sounds odd. I try to keep the Oring sort of centered, away from either threaded part but I don't know that it's critical. I don't think I've ever blown such an Oring. Never changed an Oring only, but I have had bad fittings that would have tiny leaks. (Used parts)
I'd look closely at the cylinder where it threads in. If you don't see a flaw there try a different brand of fitting.
I personally wouldn't try a different size Oring, I think that's just asking for a leak.
Just my .02.
We all know advertising works, we just don’t think it works on US!
|
|
|
|
Joined: Dec 2010
Posts: 3,734
Campfire Tracker
|
Campfire Tracker
Joined: Dec 2010
Posts: 3,734 |
Might screw them down some more then tighten the jam nut.
I believe that it will last longer. +1
|
|
|
|
Joined: Nov 2010
Posts: 19,033 Likes: 1
Campfire Ranger
|
Campfire Ranger
Joined: Nov 2010
Posts: 19,033 Likes: 1 |
Dave
�The man who complains about the way the ball bounces is likely to be the one who dropped it.� Lou Holtz
|
|
|
|
Joined: May 2016
Posts: 60,642 Likes: 32
Campfire Kahuna
|
Campfire Kahuna
Joined: May 2016
Posts: 60,642 Likes: 32 |
On the rod end? Not the gland end?
Hmmm....rubber hose to the fitting or steel?
No chance something is getting torqued out of shape is there?
I am MAGA.
|
|
|
|
Joined: Dec 2014
Posts: 9,141 Likes: 3
Campfire Outfitter
|
Campfire Outfitter
Joined: Dec 2014
Posts: 9,141 Likes: 3 |
ORB system...it's O-ring boss, you are probably using O-rings from a standard "dash size" kit...no, no don't do that...buy a kit from on-line or any hyd dealer...SPECIFICALLY the ORB O-rings which usually have a higher durometer and smaller cross section diameter which is designed to exactly fit in the chamfer of the female port. When re-installing the fitting, insure that when the jam nut is tightened the new O-ring is centered in the smooth portion of the fitting. The jam washer and smooth portion of the fitting and the chamfer should be free of obvious nicks and grooves.Forget torque and rocket science, just tighten the goddam thing up with a crescent wrench or whatever is rattling around in your machines tool box. 55 years in the trade.
Well this is a fine pickle we're in, should'a listened to Joe McCarthy and George Orwell I guess.
|
|
|
|
Joined: Jan 2016
Posts: 1,477
Campfire Regular
|
Campfire Regular
Joined: Jan 2016
Posts: 1,477 |
I own a hydraulic shop. What O-rings are you using? The fitting in the pic is O-Ring Boss thread, the port it threads into will have a recess for the o-ring. If that is what you are using it takes an SAE O-ring Boss BUNA O-ring, just any old o-ring will not work and will fail. Any hydraulic shop will have o-ring kits for ORB fittings (they come in standard sizes) and many will just give you an o-ring or two, at least that is what we do in our shop.
|
|
|
|
Joined: May 2004
Posts: 2,819
Campfire Regular
|
Campfire Regular
Joined: May 2004
Posts: 2,819 |
That is an ORB - oring boss- fitting. The orings are a specific size for that Fitting. You can find the oring aftermarket but it won’t be at Lowe’s or Home Depot.
Oil the oring to begin with. The correct installation is run the jam nut all the way back. Thread the fitting Until the oring touches, if the fitting is not oriented correctly, turn the fitting CCW up to one turn to orient as needed.
Tighten the jam nut using a back up wrench to keep from twisting the oring. If it still leaks, check the area in the cylinder where the oring sits.
|
|
|
|
Joined: Nov 2015
Posts: 5,699 Likes: 2
Campfire Tracker
|
Campfire Tracker
Joined: Nov 2015
Posts: 5,699 Likes: 2 |
I own a hydraulic shop. What O-rings are you using? The fitting in the pic is O-Ring Boss thread, the port it threads into will have a recess for the o-ring. If that is what you are using it takes an SAE O-ring Boss BUNA O-ring, just any old o-ring will not work and will fail. Any hydraulic shop will have o-ring kits for ORB fittings (they come in standard sizes) and many will just give you an o-ring or two, at least that is what we do in our shop. This! Squirrelnut knows what he is talking about!
|
|
|
|
Joined: Nov 2007
Posts: 6,964
Campfire Tracker
|
OP
Campfire Tracker
Joined: Nov 2007
Posts: 6,964 |
That is an ORB - oring boss- fitting. The orings are a specific size for that Fitting. You can find the oring aftermarket but it won’t be at Lowe’s or Home Depot.
Oil the oring to begin with. The correct installation is run the jam nut all the way back. Thread the fitting Until the oring touches, if the fitting is not oriented correctly, turn the fitting CCW up to one turn to orient as needed.
Tighten the jam nut using a back up wrench to keep from twisting the oring. If it still leaks, check the area in the cylinder where the oring sits. I have only used NH parts so far, and yes I am aware of correct o-ring material for the system. Thanks for the assembly procedure, I probably need to screw the fitting in more, I don’t recall screwing it in that far. I have looked at all port and fitting surfaces with a magnifying glass. Everything looks fine, no cracks or rough spots. I can’t tell you how many of these fittings I replaced when I was working and never had a problem with that O ring boss end, it was always the tapered ends. Gorillas can deform them a surprising amount.
Last edited by m_stevenson; 07/29/21.
Mark
NRA Life Member Anytime anyone kicks cancers azz is a good day!
~Molɔ̀ːn Labé Skýla~
Oh The Drama!
|
|
|
|
540 members (1minute, 1beaver_shooter, 1badf350, 222Sako, 007FJ, 10Glocks, 49 invisible),
2,298
guests, and
1,217
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
Forums81
Topics1,193,034
Posts18,500,687
Members73,987
|
Most Online11,491 Jul 7th, 2023
|
|
|
|