red square O ring replacement

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have square ring kits.

If it's red, it maybe urethane. ( used in high pressure hydralics )

McMaster has 1/4x1/4 Buna cord stock (9700K14) and the adhesive for bonding it. I can't remember the Loc-tite number for the glue off the top off my head, but it works remarkably well. For a dynamic seal a good joint is critical - you'll want to make an alignment fixture for making the joint if you go this route.

Ned Simmons

I tried and failed with this idea on another job. Maybe I need a better align fixture? last time I just turned some scrap to size and set the piece in there. it tore right away.

Many hydraulic repair shops can make any oddball seal from new material. Take your old seal in to one and I bet they can identify the material and make a new one if it is not a stock item.

Randy

"Karl Townsend" wrote in message news:pFiFg.7449$ snipped-for-privacy@newsread2.news.pas.earthlink.net...

I never like gluing dynamic seals. Static o-rings no problem but dynamic are a different story. Then to top that off you're working on a high pressure hydraulic system (figure 8,000lbs to 10,000lbs working pressure on a jack) where buna-n has no chance of holding.

Try here to see if you can find something similar.

If you find something then you can tell your local hydraulics place what you need. If they can't get it I can though there will be a minimum order (not much but they do the minimum by type so if it's $0.50 each we'll probably have to get 10 of them).

look up Quad rings, there should be one to fit your machine. Quad rings are replacing older seals in many applications.

John

It probably was a quad ring that was worn out.

John

WOW, that place has a huge selection. Bewildering. I guess my next stop is a hydraulics place. Its 60 miles from here, so it may be a while. I seldom go to the cities during business hours.

Karl

Try Minnesota Rubber Co. Minneapolis, Minnesota

612 927-1400 And ask for QUAD RINGS they are 4 sided Jim or try National O-RINGS 800 421-3837 in Downey Ca.

"Karl Townsend" wrote in message news:pFiFg.7449$ snipped-for-privacy@newsread2.news.pas.earthlink.net...

Karl: You are looking for a "rod seal". The cross section isn't exactly square. Pick the link for "rod u-seals" on the Hercules web site. Quad seals will also work. The color isn't particularly important as long as the material is compatible with the oil. As long as you know the oil and the approximate pressure the hydraulic shop should be able to get the right one. In an emergecy you can use regular O-rings with one or two back up rings in the same groove. If only using one back up be sure to place it on the low pressure side of the seal.

"Karl Townsend" wrote in message news:1suFg.10425$ snipped-for-privacy@newsread4.news.pas.earthlink.net...

Yep. That's why I setup a account with them. I rebuild hydraulic cylinders fairly often and I got tired of the delays in extra cost of going through my local (well 90 miles away) bearing house for them. I found that they where buying from these guys so I filled in a application form and got a account.

Not having seen his jack I wouldn't be so fast to say it's a rod seal needed. I know that most hydraulic jacks have a cup seal on the end of the rod. It can be done either way.