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3/4 NPT nipple removal from spool control

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JeffinWA

08-19-2007 12:47:38

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Here's another mess I've gotten myself into! I blew a hose on my 1956 Power Digger (backhoe). This hose happens to power the boom cylinder. One end of the hose was a bear to get off. It was attached to a street 90 fitting that screwed into the hydraulic controls housing. When I was yarding on the hose nut I accidentally broke the 90 so the threads are now broken off flush in the spool housing. If I had only thought to unscrew the 90 from the housing and then take the hose off the 90 I'd be in much better shape. The ID of the 90 is exactly 1/2 inch so I have a 1/2 inch hole to work with. Anyone have recommendations? Thanks in advance.

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larry in tn

08-20-2007 05:28:18

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

It's all in what you have and what works. I've had better luck with the spiral/lefthand easy out

Good Luck

www.oldduggy.com

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JerryB

08-20-2007 00:46:27

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

You can get an internal pipe wrench from McMaster-Carr for around $8. That should easily do the job.

Jerry

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Midwest redneck

08-19-2007 17:09:18

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

I would use an easy out or make a tapered hex or square allen wrench and lightly pound it into the broken fitting and use lotsa lube and unscrew it.

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JeffinWa

08-19-2007 16:11:47

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

Thanks for all the advice. I'll try looking around for the internal pipe wrench. Haven't heard of that one before. Also the allen wrench method is interesting. Seeing how it's in the spool it should not be too rusted in there but I'll use some penetrating oil on it for few days before attempting to get it out. Thanks all!

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glennster

08-19-2007 17:26:57

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWa, 08-19-2007 16:11:47

home depot has theinternal pipe wrenches in the plumbing dept by the sump pumps and drain augers, set of three about 20.00 or so. i bought a set when i broke a street el off on my loader.

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PJH

08-19-2007 14:47:04

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

I've driven the end of a large allen wrench into a broken off pipe fitting, and it screwed right out the first try.

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NC Wayne

08-19-2007 13:23:40

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

Since it"s a 3/4 it shouldn"t be all that hard to get out. You can try an internal pipe wrench or an easy out like the other have suggested if you"ve got one. If not take a hacksaw blade and saw through the fitting on at least two sides. It"s easier if you can get through it in three or four places but two works if that"s all you can get. This will allow you to collapse the fitting and get it out pretty easily. Since it"s in a hydraulic valve chips could be a problem so coat the blade with a good sticky grease. This will help catch the chips produced while cutting and hold them with the blade or at least keep them close to make cleaning them out easy. Good luck.

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CCer

08-19-2007 13:07:21

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

There is a tool, an internal pipe wrench, a pretty simple tool. A hex stem,on one end, with a splined stem on the other end. it has a splined eccentric, beside the splined end. Insert the tool, turn the hex, the eccentric tightens up to turn out the pipe.

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IH2444

08-19-2007 15:28:56

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Re: 3/4 NPT nipple removal from spool control in reply to CCer, 08-19-2007 13:07:21

yep the internal pipe wrench.

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Fawteen

08-19-2007 13:02:02

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Re: 3/4 NPT nipple removal from spool control in reply to JeffinWA, 08-19-2007 12:47:38

Been there, done that. One of the few times an "easy out" actually worked. Easy-outs that big ain't cheap, but they do work.

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RayP(MI)

08-19-2007 15:41:21

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Re: 3/4 NPT nipple removal from spool control in reply to Fawteen, 08-19-2007 13:02:02

Adding to Fawteen"s post: I have much better luck with easy-outs that are straight fluted, as opposed to those with left hand spiral flutes. As you tighten those darn things they tend to expand the broken piece, causing threads to bind even worse!

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