How to un-tighten hydraulic hose

[macecase]

I have a John Deere 250 skid steer. I have a bad hydraulic line that I have to replace.

My question is... HOW do I undo or loosen this hose?

I have highlighted the places where I have put wrenches. As it stands now, the parts circled in red and blue spin/loosen together. I presume I have to break their connection to looses the nut closes to the 90 degree end... So, basically, the black pump that they are screwed into has the red part in between it and the blue part... Right?

If so, I have two wrenches on them and are pushing the blue part down and the red part up and it isn't budging... I am using cheater bars and nothing... What gives? or, am I missing something obvious? Tips? Suggestions?

 

[rustyshakelford]

To me it looks like the red fitting needs the wrench

Brett

 

[JB13502]

Maybe previous owner sealed with Locktite?

 

[SimS]

Plan A: If the hose that has to be replaced is the one in the picture, cut the metal tube portion of the fitting and get the remaining parts in a vice where you can work on it with extreme prejudice.

Plan B: Apply some heat with a small propane torch and "quench" with a rust penetrate of your choice. Go easy with the heat because that fitting on the pump is more than likely an O-Ring fitting. Give it a few heat/cool cycles to loosen rust or previous thread sealers.

Try and use fitting/flare wrenches, they help a lot in these situations. Good luck

SimS

 

[k0ua]

If so, I have two wrenches on them and are pushing the blue part down and the red part up and it isn't budging... I am using cheater bars and nothing... What gives? or, am I missing something obvious? Tips? Suggestions?

If I understood what you said, your movement of the red wrench "up" would be tightening the nut. In referring to directions to move nuts and bolts, please talk about clockwise and counterclockwise when viewing the nut head on. But if the end of the wrench went "up", then you were turning the red nut clockwise, which would be tightening it if it is threaded with right hand threads.

 

[/pine]

If I understood what you said, your movement of the red wrench "up" would be tightening the nut. In referring to directions to move nuts and bolts, please talk about clockwise and counterclockwise when viewing the nut head on. But if the end of the wrench went "up", then you were turning the red nut clockwise, which would be tightening it if it is threaded with right hand threads.

I think the OP meant pushing up on the red was for resistance of the blue being pulled down...i.e., keep the adapter from loosening in the valve...??

I was going to suggest striking it with a mallet but it seems a cheater pipe would have broken it loose...??

 

[ovrszd]

The "red" nut is an adaptor. It changes the thread in the cast housing to the thread type of the hose end. It needs held in place, do not allow it to turn. The "blue" nut needs turned counterclockwise to loosen. Once loose you will see it is a swivel nut on the hose end.

As James pointed out, talk in clockwise/counterclockwise terms so there's no misinterpretation.

From the looks of all this, it's been there awhile. It will require brute strength and a very good wrench. Be extremely careful to not "round off" the nut. If you do, your problems will accelerate quickly.

I believe they call the blue nut fitting a JIC. But don't quote me on that.

 

[k0ua]

The "red" nut is an adaptor. It changes the thread in the cast housing to the thread type of the hose end. It needs held in place, do not allow it to turn. The "blue" nut needs turned counterclockwise to loosen. Once loose you will see it is a swivel nut on the hose end.

As James pointed out, talk in clockwise/counterclockwise terms so there's no misinterpretation.

From the looks of all this, it's been there awhile. It will require brute strength and a very good wrench. Be extremely careful to not "round off" the nut. If you do, your problems will accelerate quickly.

I believe they call the blue nut fitting a JIC. But don't quote me on that.

You know, I bet your right, that the "red" is a " standard pipe thread" to JIC adaptor.

 

[newbury]

And anytime I get extreme resistance trying to loosen something I'm usually at the point of tapping wrenches with a small hammer. Before I do that I get out the can of Kroil or PBblaster, give it a few drops, let it sit a bit, then try again.
Next step is to tap it a little bit in the tighten direction, then go back to muckling on loosening it.

 

[k0ua]

And anytime I get extreme resistance trying to loosen something I'm usually at the point of tapping wrenches with a small hammer. Before I do that I get out the can of Kroil or PBblaster, give it a few drops, let it sit a bit, then try again.
Next step is to tap it a little bit in the tighten direction, then go back to muckling on loosening it.

It is true that even a tiny amount of impact will often do so much more than applying leverage alone. And yes Kroil or "knock her loose" or your favorite loosening agent can go a long way. Some swear by the automatic transmission fluid and acetone mix called Ed's red, also sometimes made with stoddards solvent. Or other variations on the homebrew. I use Kroil. it is the best I have found.