9N Dearborn 19 8 Loader Hydraulics

I have a 9N with a Dearborn 19-8 Loader. I need to replace the V-seals on one of the hydraulic cylinders. How do I get the old v-seal out? It seems I need to remove the snap ring that holds the V-seal in place but I can't figure out how.

If you can see the whole snap ring, and it's shaped like a wire, you may have to drive the end cap in about 1/4 with a punch, and then the snap ring will peal right out. If has a wire that goes thru a hole, you have to pull the wire out. Mark.

Mark,
Thanks for you reply. Unfortunately there are 7 seals that sit between the snap ring and the cap. I need to replace those 7 seals.
Richard

How about posting a picture? Mark.

Mark,
I hope you can access the link. It's a Youtube video that shows the seals removed but not how to do it - how do I dig them out of the cylinder?
VSeals removed

Mine is the same as in this video.. once the gland nut is removed the seals are just under that and you can pick them out. You have to turn the big nut and back it out. Then it'll slide off the rod.







This post was edited by Nyquil Junkie on 03/12/2023 at 01:13 pm.

Thanks Nyquil Junkie, it's great to hear from someone who has been through what I need to do.

When you pick them out, do you take out the rod first? I don't have experience picking.

NJ,
Thanks for the additional photos. It looks as though you broke the seals up with picks. In the picture I sent,
it looks like the old seals were picked out whole. Do you know how that is done?
R

(quoted from post at 16:38:59 03/12/23) NJ,
Thanks for the additional photos. It looks as though you broke the seals up with picks. In the picture I sent,
it looks like the old seals were picked out whole. Do you know how that is done?
R

Click to expand...

It just depends on the type of packing as well as how old and brittle the packings are. The ones in the video appear to be a fabric composite. Nyquil Junkie's packings appear to have some poly rings alternated with the fabric composite. What you have for picks or packing pullers can make a difference in how much the old packings break up during removal.

I am thinking the snap ring you mentioned is further down in the barrel and you do not need to remove it unless you want to pull the cylinder rod out. I think it is part of the stop that prevents the rod from coming out of the cylinder during operation.

Jim,
Thanks so much for your message. Yes, you're right about the snap ring - it's just to hold the V-seal packing up
agains the gland. I have a set of picks so it seems like I just need to kind of poke at the seals until they break
up. Is that the way this works?

They might break up or you might be able to get them out pretty much intact. Depends on how deteriorated they are, the tools you have to use and your skills.

NJ,
I'm hoping you can help a bit more - you are the only person I've come across who's done what I need to do.

Have you ever taken the rod out of one of these cylinders? It seems impossible to get out the C-Ring that holds the packing. It also seems like you have to do it to get the rod out.

With the amount of oil that is being held by the packing, the piston itself must be leaking a lot.

(quoted from post at 16:28:20 03/13/23) NJ,
I'm hoping you can help a bit more - you are the only person I've come across who's done what I need to do.

Have you ever taken the rod out of one of these cylinders? It seems impossible to get out the C-Ring that holds the packing. It also seems like you have to do it to get the rod out.

With the amount of oil that is being held by the packing, the piston itself must be leaking a lot.

Click to expand...

Pull the rod if you want, but I don't see you gaining anything by doing that. Because you have a single acting cylinder a piston with packing on it, is not needed. The cylinder rod extends as the pressurized oil fills the barrel, since the oil does not compress. The chevron packing under the gland nut does all the sealing.

If you look at the parts breakdown you will see you do not have a piston with packings on it. The cylinder rod (item key #1) has an oversize solid steel end welded to it. it goes into the barrel then the stop ring (item key #8) is inserted and the split ring (item key #6) is installed keeping the stop in the barrel, preventing the rod from coming out of the cylinder barrel. The O-ring (item key #7) seals the packing nut (item key #3).

I will say I am not sure on these Dearborn cylinders, but in some similarly built, the inner land of the groove the split ring (snap ring) is tapered so you can reach in with a punch and tap the ring down out the groove. Once they are a way below the groove, they can be tipped slightly. They can be worked passed the groove as long as you keep them tipped. If you pull them straight out, they will snap back in the groove.



This post was edited by Jim.ME on 03/13/2023 at 02:56 pm.

Jim,

That's super helpful. I was under the impression that the pressurized oil was kept to the left of the rod in the
diagram, but if I understand you correctly, the whole cylinder is under pressure. Is that how it works?

If I have that right, then I now see why the piston doesn't need to seal - just the whole cylinder by the packing
under the gland.

Thanks for setting me straight.

Jim,
You just taught me what a displacement hydraulic cylinder is. Thanks so much.
RL

(quoted from post at 18:58:09 03/13/23) Jim,
You just taught me what a displacement hydraulic cylinder is. Thanks so much.
RL

Click to expand...

You're welcome. Don't want to see you risk damaging parts you don't need to remove.

Thanks again for educating me.

I just need to pick the packing out. Now that I understand how the thing works, I might use the hydraulics to
push the packing out by holding the rod while actuating the control. That might get a bit messy.
R