Hyd pics

Its called o-ring boss which has straight threads. The hyd cylinder should have a champher for the o-ring to seal in. If the cyl. has pipe taper threads it should have leaked a bunch.

If fittings for new hose elude you, switch everything over to pipe or jic fittings. Hydraulic oil doesn't care what fittings are used. Go to any good hydraulic shop where they stock gobs of fittings. They should be able to adapt something for you.

Reading your other post, it sounds like the hex will turn in the hose. If so, it is a swivel male O-ring boss hose fitting.

Here is a chart giving the thread size and pitch for these fittings so you can determine the size,



EDIT: Here is his description in his previous post, maybe this will help. It reads as this hose end was directly in the cylinder port and the hex swiveled to back it out. The cylinder and fitting are O-ring boss, pipe thread. I believe John Deere used a number of these male swivel hose ends on farm loaders, at least I've encountered some, both O-ring boss and NPT.

This is a picture of the hydraulic hose fitting where it connects to the cylinder on my 3 point snowblower. This hose is leaking and needs to be replaced. The other isnt far behind. The inside is tapered like a compression fit. This fitting is so short it will never bottom out in the cylinder and if it did the cylinder has no taper like a compression fitting. There is an o ring on the hose fitting you can see which Im guessing was sealing it. I thought this fitting would come out of the actual hose but appears to be part of a swivel clamped on the hose. So when I got I get a hose what fittings do I need to make this work ? Im familiar with replacing hoses at work, have made new hoses but this seems strange. The fittings never leaked. Line got a hole in it. I bought the blower used, so I have no idea if the history."

This post was edited by Jim.ME on 12/10/2021 at 03:16 pm.

yes exactly...so if its orb threads thats what has to go into the cyl. no changing fittings there. if its a pipe thread in cyl. then that is what must go in there. better check to see which it is. orb is straight thread,... pipe is taper thread. they do not interchange.

There was not flat for the o ring to seal on. I have no idea why it never leaked. It should have probably but didnt.

(quoted from post at 19:34:08 12/10/21) There was not flat for the o ring to seal on. I have no idea why it never leaked. It should have probably but didnt.

Click to expand...

The O-ring does not seal on a flat surface. The port on the cylinder should have a slight tapered counterbore leading into the threads. The O-ring gets compressed in that area. Your pictures of the O-ring on the fitting show it has been compressed in that manner. Post a picture of the inside of the port on the cylinder and I think the tapered counterbore will show.

Picture of a typical O-ring Boss sealing arrangement for a straight-line fitting, like your hose end, from a Parker catalog. Elbow adapters and other fittings needing positioning often use a nut and washer made on the fitting above the O-ring so it can be sealed in different orientations.




This post was edited by Jim.ME on 12/10/2021 at 04:07 pm.

there was not flat are you meaning it has the chamfer for the o ring to fit in,... if so that is the correct it should be.

From pic of hub on cyl I would say its iron pipe thread 1/2 inch. If was Boss it would have bigger od

I bet shaun wallace is correct- pipe thread. Much of the econo short-line equipment uses pipe thread. Not great in high-stress situations, but a cylinder on a snow blower will rarely generate enough back pressure to make the 'wrong' fitting leak. The thread pitch of 1/2 pipe and 3/4 ORB (on your hose) are not interchangeable, but close enough that a mistake can be made and I guess that's what happened.

The inside is tapered like a compression fit. This is just to improve flow- not to make a seal. I thought this fitting would come out of the actual hose but appears to be part of a swivel clamped on the hose. The word 'swivel' here is confusing. No part of that fitting should swivel on the hose.

To get the best answer, remove the paper towel and post a photo showing the opening at more of an angle.