ford 3000 (I think its a 1974)

I have a hydraulic leak at the smaller pipe from the pump where it inters the rear end case on the right side. It must be a return line because it only leeks when I lower the 3 point. I disconnected the fitting from the larger fitting on the tractor and there is a flat seal the would take the place of an O ring I thought I would find. I was afraid to take the seal off because I don't know if I can without destroying it. I'm not sure I can find a new one. Does any one have a parts book that shows that seal. and if it is sold by it's self. That pipe might come with the seal. Doesn't seem to slide off and it's hard to see. Hopefully One of you all has been there and can give me some of your experience and a part number. I found the pipe but it is a two piece that comes with a different single attachment at the ends. Mine is two separate pipes. Thanks

The dual pipe assembly with the single connector plate on the end is from the earlier tractors made from 1965 through September of 1969. If yours has the separate lines with their own connections then it is the later style.

The smaller diameter line is the pressure line coming back from the pump to the 3 point circuit. The parts diagram does not show any kind of seal or o-ring between the large and small nut, only an o-ring between the large nut and the center housing. If there is a seal on there then it is captive and would be part of the nut and not meant to be replaced separately from the nut.

The large nut, small nut, and o-ring are sold as a single kit, as they should all be replaced at the same time. The part number for the kit is C7NNH856B. partspring.com claims to have 85 of them in stock for $102.00 per kit.

Thanks for getting back to me. I checked partspring.com but cant find an image for that area. I can't even find the pump. I did look up your part number and it seems to be the two nuts and an O ring. The O ring must be behind the larger fitting. I didn't take the larger nut off only the smaller fitting because that's where it looked like the leak was. The seal I'm referring to is on the line and looks like a fat rubber band (but not rubber) that appears to be attached to the pipe itself. then when you tighten the fitting it must put pressure on the seal to make the seal. So it doesn't look like that kit would be the one. I wish they had an image. Also I wish I took a picture when I had it disconnected so I could show you. Can you see that pipe it's self as a replacement part. I don't see it listed there. There must be more to it. Seems like $102 it a lot for two fittings and an O ring. maybe the pipe in a part of It. I never have been good at this computer stuff.

Anyway to keep me going I used a gasket sealer on the seal but it back. The leak has stopped when I tested it with a teder attached (not to heavy). The leak wasn't under a lot of pressure
and only leaked going down. I just need to know I can get the parts when it leaks again. Thanks for your time.

Here's a link to the parts drawing on the New Holland parts site:

[u:06154ace22]http://partstore.agriculture.newholland.com/us/parts-search.html#epc::mr67519ar665950[/u:06154ace22]

Use the slide control in the bottom left of the drawing to zoom in and the use you mouse to drag the picture around to see the zoomed in section that you are interested in. Part numbered 70 in the drawing is the large nut, which includes small nut and o-ring. You are correct that the o-ring goes behind the large nut. There shouldn't be any sort of seal on the tube itself that I am aware of, so whatever is on yours was probably added by a previous owner to try to stop the leak. The large nut screws into the center housing with the o-ring behind it, and then the small nut slides up onto the tube and as you screw the small nut into the large nut it acts like a compression fitting and as long as the tube is its original diameter and smooth without any imperfections it should seal just from the compression effect. The nature of a compression fitting is that once you have used it and then unscrewed it, it will likely not seal as well, if at all, the next time you tighten it
down. That is why the sell all 3 parts together, if you need to replace one you need to replace all 3.

If your tube is damaged somehow, either pinched, scratched, or something similar, where it goes inside the small nut, you may be able to clean it real good and build it up a little with epoxy and then after it has hardened sand it down smooth, and then you could use the kit with the new nuts and o-ring to hopefully get it to seal.

If your tube is damaged beyond repair then you will be calling around to scrap yards to find one. The original part number for the tube itself was D0NNH867D, which was later superseded by part number 84272024, which appears to be no longer available new.

No matter what, you will need the new large nut, small nut, and o-ring.

If they leak they need to be replaced.
Last one I bought I got off eBay for $40 or
so.
DO NOT try to slide the old metal washer
off.
It will eat away at the tube and make it
unuseable.
Slide the nut back out of the way and cut
the washer off then break the pieces away.

Sorry to resurrect this thread. I tried a new post and got no responses. Mine did not have any sort of washer on there when I took it apart. If it is likely to scratch the line enough to harm it, is it that tight on the tube?

I am struggling to find a good answer as nothing holds the tube in place on mine. I bought the new large/small nuts kit and still have leak. The line can be pulled out a bit as well which would make sense why it leaks if the line is under pressure and able to slide in and out readily.

Thanks to all in advance.

Jeff

I don't understand the small nut large nut Jeff, mine is a 71 3000 and has a compression nut like this at YT, although this one won't work as advertised. Is yours like this? or is it the earlier 3000?

https://www.yesterdaystractors.com/C7NNH856C_Hydraulic-Pump-Compression-Nut_30992.htm?gclid=EAIaIQobChMI4aXwk7qG4AIVBB-tBh1nBwPZEAQYAyABEgKcKPD_BwE

The left side of the pic is the small side that sits inside the larger. The link you posted looks like the 'sleeve' in the smaller side on mine.

Jeff

This is what I bought to replace mine:

www.messicks.com/part/c7nnh856b/nut-assembly

OK I had to go look at mine again (its been a while) I get the small nut big nut thing now. I only replaced the small nut and rubber with the one I pictured from YT, twice as a matter of fact (thinking I didnt have it installed right the first time) It Dont Work!!! and is missing a critical part, a conned shaped steel washer that when the nut is tightened it crimps on the pipe.

I found this out after a lot of trouble and then going to New Holland and looking at theirs. After questioning the counter man about the 40 buck price he said well I guess its what works for you.. Amen!

BTW.. I bought a new pipe at the time and nuts from YT, the pipe worked after getting the nuts from NH.

and here's another one that won't work as advertised..

https://www.amazon.com/C7NNH856C-Ford-Holland-Pressure-Assembly/dp/B019A6S1I2

That makes a lot more sense then. Mine is missing that cone shaped washer. That would explain why it can simply slide out after the install.

Now to find it with NH!

Thanks!

Jeff

Might call you nearest NH dealer, mine (20 miles away) had them in stock.

Even Walmart has the ones that don't work.. Amazing

https://www.walmart.com/ip/C7NNH856C-Fits-Ford-Fits-New-Holland-Pressure-Nut-Assembly-2000-3000-3400-3500-3550/131921374?irgwc=1&sourceid=imp_U7gRAp0CRxyLWkHwUx0Mo3b1UkE0Rv04e3ZwXE0&veh=aff&wmlspartner=imp_2003851&clickid=U7gRAp0CRxyLWkHwUx0Mo3b1UkE0Rv04e3ZwXE0&sharedid=

Walmart has it ALL! Even old tractor parts! lol