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Farmall & IHC Tractors Discussion Forum

Which Hydraulic connector or hose?

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Author  [Modern View]

06-22-2022 20:00:03

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The hydraulic hose to my disk had lost a lot of the rubber covering and looked bad, so I decided to replace it. Connecting it to my 986.

I bought a hose end like this one, with an old-style International tip.

I bought a Hydraulic hose assembly from a farm supply store, 1/4 inch by 60 inch.

It fit, I was able to screw the hose into end/connector, put a couple of crescent wrenches on them and tightened it down. It worked, the disk raised, but...
The problem is that oil was spraying out, under pressure, so I assume something is wrong.

The hose says it has Male Pipe Thread I'm assuming the threads or connection is wrong or incompatible between these 2. Maybe the IH old-style end is NPT? Is that correct? Is that different?
Do I need an adapter to make these 2 work together? Or should I have bought a hose with different threads?

Thank you!

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06-23-2022 03:51:08

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 Re: Which Hydraulic connector or hose? in reply to Tree-Farmer, 06-22-2022 20:00:03  
Your links show as a coupler hose end with 1/2' NPT threads and a premade 1/4" hose (you say you bought). Most premade hoses from farm stores, I am familiar with, have ends matching the hose ID so the threads of the fittings would be 1/4" NPT, but the info you posted for the hose does not tell us the size of the male pipe thread. 1/4 NPT would not thread into 1/2 NPT, it would fall in. Not know where the oil is spraying out and what you really got it is hard to say what you need. You say the end was like this one. Was it that actual part number or a different one that looks like that one? If you did not get that exact coupler end, did you get a coupler end with 1/2" Female SAE O-ring Boss threads? NPT and O-ring Boss (ORB) fittings can seem to thread together but will leak as the threads do not match.

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caterpillar guy

06-23-2022 03:05:08

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 Re: Which Hydraulic connector or hose? in reply to Tree-Farmer, 06-22-2022 20:00:03  
I'm betting you have pipe threads on your hose and a 3/4 16 thread coupler. this will leak as the threads are not the same. If it is pipe thread then the hose and coupler are not the same size which I would doubt they would even screw together. If at the disk end you need to compare your old hose with the new one for thread and pitch. It is probably a JIC fitting or a smaller or larger pipe thread which again may not screw together and seal. If they have what looks like a slight bevel around the inside edge of the fitting by the threads then it is probably a JIC. Pipe threads don't have the bevel at the edge of the fitting threads. Take a look at Surplus Centers web site for better detail and pictures of fittings if you can't compare the hose ends to what you bought. They have some good pictures with lots of pictures and fittings for comparison.

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used red MN

06-22-2022 22:07:44

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 Re: Which Hydraulic connector or hose? in reply to Tree-Farmer, 06-22-2022 20:00:03  
You do not say where it is spraying out? Between the new hose and coupler? You say you bought one ..like this one.. in your link. Was it just similar or was it exactly like that one? The specs shown on the link say it the coupler threads are 1/2 NPT, the hose spec shows Male NPT but no size. If they were different size pipe thread I am pretty sure they would not thread together very well. I do not believe a 3/8 in male would come close to attempt to tighten. If it would it would be extremely wobbly in. The first couple of threads and it certainly would leak. Now if the leak is on the end where it attaches to the implement then it is a possibility that female threads on the implement were different. Oring boss ..ORB.. comes to mind. Those have straight threads, not tapered and a provision for an oring to seat and seal at the end of threads where the wrench hex begins. I would recommend to always use a thread sealer like Rector Seal. See link. If the threads at the coupler and hose are leaking pull it apart look for damage, dope up the threads and tight it back down. And if you are using 10 inch crescent then tighten it to all you give it. Lastly, I personally would have gotten at least 3/8 in. ID hose. The 1/4 in. you got seems small to me maybe they use that small stuff on newer equipment.

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