Bottle jack piston seal repair

[martik777]

This is a very old jack, at least 50 years old. There is a spring loaded ball bearing below the cylinder.


What kind of seal do I need to repair this. The old one was leather appears to be cup shaped. Can I enlarge the slot and use an O-ring?

Thanks

 

[469 runner]

You need a repair kit with the proper cup seal. This looks like a Hein Werner. The model number should be stamped on the base. Call Ohio Hydraulic, they will have what you need.

 

[martik777]

I checked http://www.hcrcnow.com but all their kits all run approx $50. Couldnot find anything for this one - model 710A.

If I had a photo of the what the seal looked like I may be able to fabricate one

 

[frankthezapper]

No, you cannot use an O ring, you need a leather cup washer. They are as rare as rocking horse ****, but when you find a place that sells them you will find that they come in a multitude of sizes. They used to be used in farm water pumps, especially windmill pumps. There used to be a place here in Brisbane that made them, softened a leather disc, forced it into a tube with a mandrel, dried it (it was now somewhat cupped) and then turned it in a lathe to cut the flared end.

 

[martik777]

Thanks,

For now, I machined some hard rubber on my lathe to fit the piston. It's working ok.

I may try to make a leather one as you described. I'm not sure how they forced it into the .050" groove though.

 

[mikegt4]

I checked http://www.hcrcnow.com but all their kits all run approx $50. Couldnot find anything for this one - model 710A.

If I had a photo of the what the seal looked like I may be able to fabricate one

That 710A may well be the part number for the base plate casting. My old NAPA/Lincoln bottle jack has part numbers on all of the cast iron parts but not the model #. The casting is most likely used for several models.

 

[braxton]

try baum hydraulics ask for jerry they may be able to help, https://www.baumhydraulics.com/home.php

 

[frankthezapper]

I think they turned the flat part down to fit the groove; but now that you've made a rubber one you'll probably find that it lasts forever. And great that you've made it with the material at hand.....that was probably what the original makers did!