Floor jacks and hydraulic seal types
These are very poor design and the oring isnt used as a sealing surface, It is in fact used as a loaded ucup and the pressure from the fluid uses the oring to keep the pressure uniform around the very thin Ucup retainer.
The Norco jack in the picture is your typical Import design that has been used for many years. That jack actually uses Poly Ucup so i will vouch for that part of the jack. I still dont think its worth the money when compared to the HW models but is hands down better than the Previously discussed Oring/Ucup retainer. You can find actual Ucups in the older Imports including the legendary Green/White Sears Jap jacks.
Now for the million dollar question. The Milwaukee jack does utilize oring on both Pumps and the Ram, But the main difference is how they are used. Instead of being inside a U cup retainer (see pic above) its used as a compete sealing surface where it gets a 360 degree seal inside the Ram. This is a very good design and im sure a few of you have torn hydraulic cylinders down where the same design is used. When you consider the tight tolerances that are used it works very well, Not to mention there is a backup on each side of the Oring, which is like injecting a Oring with steroids. I cant really vouch for Milwaukee jacks, Ive probably only worked on 2-3 in the 20 years ive been rebuilding jacks. There not near as common as a Walker/Lincoln design despite there History.
Ok. I finally got some puter time. In reference to the 3 models you listed here, First off the Low Profile jack. It does use the Junk Ucup retainer with the Oring similar to the one in my tutorial and this Pic.These are very poor design and the oring isnt used as a sealing surface, It is in fact used as a loaded ucup and the pressure from the fluid uses the oring to keep the pressure uniform around the very thin Ucup retainer.The Norco jack in the picture is your typical Import design that has been used for many years. That jack actually uses Poly Ucup so i will vouch for that part of the jack. I still dont think its worth the money when compared to the HW models but is hands down better than the Previously discussed Oring/Ucup retainer. You can find actual Ucups in the older Imports including the legendary Green/White Sears Jap jacks.Now for the million dollar question. The Milwaukee jack does utilize oring on both Pumps and the Ram, But the main difference is how they are used. Instead of being inside a U cup retainer (see pic above) its used as a compete sealing surface where it gets a 360 degree seal inside the Ram. This is a very good design and im sure a few of you have torn hydraulic cylinders down where the same design is used. When you consider the tight tolerances that are used it works very well, Not to mention there is a backup on each side of the Oring, which is like injecting a Oring with steroids. I cant really vouch for Milwaukee jacks, Ive probably only worked on 2-3 in the 20 years ive been rebuilding jacks. There not near as common as a Walker/Lincoln design despite there History.
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