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Walker made the jack. the red paint may indicate that it is a Snap-on relabel.

The hcrcnow.com website has a decent catalog of hydraulic jack diagrams you can search through. Sears has rebranded many jack designs over the years, so it’s kind of hard to guess what jack you have without seeing it.

FWIW, the weaver WA72 has a built in safety overload valve. The jack will know when you have exceeded 2 tons, and refuse to lift anything higher than 2 tons. Do you see the spring at the pressure release valve mechanism? That spring is calibrated to resist the equivalent of 2 tons. If you...

Try putting the smaller ball in first, and the larger ball on top. I think you probably took out the screw for the “working valve”.

You could use something such as a zip tie as a dipstick. Stick it through the fill hole, hit the inner cylinder and see how much you have. A few mm above the inner cylinder (when jack is lowered) and I’d call that good. When the jack is at its highest lift, the oil level should be above the...

Any chance you can share a pic of your jack’s hydraulic cylinder/block or its brand/model? a general rule of thumb is that when you’re peering into the reservoir through the small fill hole, you’ll see the inner cylinder. When the jack is completely lowered, the oil should be just...

the spring tension is probably be problematic now if you don’t already know what the setting is. You were supposed to count the number of turns to fully seat the top bolt down before removing it, so you know how tight it should be. Now you can only guess. do you know if this is a quick/rapid...

if those re the only parts that came out, most commonly: small ball on bottom, large ball on top. Needle valve on bottom (pointy side down), spring on top.

I found this for you: https://media.hcrcnow.com/uploads/drawings/Blackhawk_B67405_Service_Jack_4_Ton.pdf

When I look at the pictures of both kits, I think both will work, depending on your jack version. Perhaps give the vendors a call to make sure. There is probably a sticker/label on the side of the jack somewhere that has a serial number indicating the manufacture date that the vendor could...

I have the original 1/4” 2456 and the first fuel 3/8“ 2557. I prefer the 1/4“ because the 3/8” feels significantly heavier and also head heavy/unbalanced. if I’m not careful slowing down the rotation before the fastener tightens, the increased torque can almost pull the ratchet out of my hand...

I’ve been Ryobi 18v for about 20 years now (I also use Milwaukee‘s 12v system). I went to it bc of the long term battery compatibility and range of products (auto, lawn, and woodworking) at the time that I was making a choice. For me, the batteries begin to show decreased capacity and a become...

Just curious if you removed the burrs on that extension limit groove?

Im not sure what a concentric design is. The S4 diagram is certainly new to me, I have not seen anything exactly like that before. Most of my amateur tinkering has been on walker/lincoln and the chinese clones of the japanese import (what Hiball calls the Yasui) design.

the general concepts of having one way check valves to direct oil + spring loaded valves to act as a quick lift switch or safety valve are common concepts. the specifics of where all the oil channels in the hydraulic block and where all the valves (which valve is which?) are located are...

So here is that hydraulic block for the S4. It is a single pump quick lift system. That means it has to have a way of pumping a lot of oil with no load for the quick lift, and then switching to pumping less oil when a load is lifted to gain an additional added hydraulic/mechanical advantage to...

@olddog1 asked me to talk about floor jack valves. I think it would probably be good to review a basic single pump system before tackling on systems with a quick lift. here is a diagram from a Hein Werner 93642: in this picture... The green mark is over where the port for the pump is located...

Hiball is using some different terminology in post #8 than in the diagrams. When he refers to speed side bypass and high side bypass, he’s talking about the overflow valve. When he talks about the overload valve, he is referring to the safety valve. In that thread, that person has valve plugs...

The second diagram that @paulsomlo linked also shows no ball under the overflow valve. So if you say a ball is there, it’s in the wrong place. Going from left to right, I see 0,1,2,1 balls. In the valve with 2 balls, it denotes a 7/32 on bottom and 5/16 on top.

well, like I said, it is a guess as to how it could work. I could be wrong. I agree that the schematic is not drawn so that it is easy to figure out what is what. I would consider blowing compressed air through passages to try to see what holes really connects to what. You’ll become the...