On Wednesday, August 1, 2018 at 1:24:30 PM UTC-4, Leon Fisk wrote:
On Wed, 1 Aug 2018 09:20:33 -0700 (PDT)
wrote:

So I've got an older hydraulic floor jack that can't keep it up.
I took apart the plunger assembly... hoping to find a bad o-ring.
The O-ring was fine, but at the bottom of the plunger was a
conical frustum (cone with top cut off.) made of some rubbery
material, that has a split in it.
What do I call it?, and where can I find a replacement?
I'm mostly just looking for the right name of the thing.
(rubbery frustum)

The Jack has the following number on it, 649N. Any other ID has
been lost over time. I'd guess it's age to be about 30-40 years.

Thanks,
George H.
(right, I could just go buy another jack...)

Is your email address good? I've got a couple old manuals I can send
you. One is for a Blackhawk floor jack and the other is for bottle and
floor jacks. Parts are similar though.

Can you open/read djvu files? The second manual is in djvu format.

These manuals call that part a "cup washer" and a "plunger cup" if I
understand your question correctly.

--
Leon Fisk
Grand Rapids MI

Hi Leon, email is good. or gherold(at sign)teachspin.com
I can't read djvu format.. but I assume I can find something on the web.
I don't think I need a manual. But "cup washer" and "plunger cup" look like search terms to start with. If I think about it I'll post a picture this
evening.

Thanks,
George H.