I have a leaky hydraulic cylinder on the 19-8 front-end loader on my 9N. It needs a new V-seal. Can someone tell me how to get the old one out?

Thanks,

Unscrew the packing box on the rod end of the cylinder.

TOH

I unscrewed the cap off the end of the cylinder. Now how do I get the seals out? I think the 7 seals sit on some kind of a retaining ring. How do I pull them off the retaining ring?

Pull the rod out.

TOH

TOH,
Thanks very much for your help. Unfortunately my 9N is at our vacation home that is 400 miles from where I am today.

What I can't figure out is if the rod will come out without removing the ring that retains the vseals. I would think that the piston cup would be too big of a diameter to get past the retaining ring. How does the piston cup get past the ring?

There is no piston - just the rod. There is a metal stop bolted to the end of the rod.i dont know if the rod comes out with the packing box in plsce or if you need to u screw it as well.

TO

TOH,
Thanks for sticking with me.

The problem is that this cylinder (an 021) has no packing box. The packing sits inside the cylinder against some kind of retaining ring. It's that retaining ring that I can't figure out how to remove.

Here is a video. The old packing was simply pulled out using a pick and new packing slipped over the rod.

https://youtu.be/Boffrh-oiN0

TOH

Pull the rod out. If there is no box it has to come out once the nut is removed. These ate very simple displacement cylinders.

TOH

Mine are exactly like these in that video.... The parts diagram shows a nut and an O ring on a piece at the end of the rod, but I could not get my rod out. There seems to be a retainer ring in there somewhere, by the diagrams. I couldn't figure out how to get it out to remove the rod...so the O ring at the end didnt get replaced. if I figure it out one day I will replace it.

But as for the V packing, yeah once you take the gland nut off, the packing is under it, you just pick at it until you get it all out.

I replaced mine with a set of PTFE ones from mcmaster-Carr... they are very hard with no squish, my piston still drips a little. I plan on getting a set of leather Vpackings and put one between each PTFE ring. As I read the leather ones make a better seal (so I read somewhere on the inteerwebs... who knows if its true)

Maybe the PTFE ones need tightened down more than I did.. I dunno. They are a lot harder than I thought they were, had I known that I would have ordered softer ones elsewhere.

The Vpacking removal and replacement turned out to be simple. Remove the gland nut, slide it off the rod, and remove n replace the packings.

if anyone knows how to get the rod out of these (exactly the ones in the video, on a WM3 loader) I'm all ears.

I believe that is a lock washer not an o-ring.

According to the videoe there is a snap ring behind the vee packimg. Presumably that is what retains thye stop on the end of the rod. Remove it and the rod should pull right out. Since there is nothing in there not much reason to do that.

TOH

In that manual look at page 6, items 7,8,and 9. i took these to be some kind of seal at the end of the rod? #8 is an O ring.

I don't see how that fits in that space, the rod takes up almost the whole cylinder diameter inside. I couldn't get the snap ring out under the packing to remove the rod, it didnt seem like there was any gap in the ring to pick it out.

I have to take the other side off and repack that one too, I'll take a better deeper look into how to get that rod out.

I have no idea what 6,7,& 8 are in that diagram...

These are displacement cylinders. The end of the rod acts as the piston and the cylinder does not need a seal other than the gland seal and wiper on the end of the tube.

The diagram for the Dearborn 19-21 single acting cylinder is probably a better bet on how the 19-8 cylinder is constructed. As you can see its very basic. Items 6, 7, and 8 in the Wagner cylinder diagram are stops/guides to help align the rod and prevent it from being pushed out of the cylinder.

TOH

Number 6 is the snap ring that keeps the packing (#5) in place. The packing is held between number 6 and the cap (number 4). Items 7,8, and 9 are the piston. You can't get them out without removing item 6.

That said, I have no idea how to remove the snap ring.

I'm focused on getting the packing (#5) out. It seems like I just need to pick it apart.

If the WM-3 cylinders are constructed like the 19-8, this manual may offer some help. It will at least allow you to confirm the components on the rod.

• Click here to download it from our Manuals library