Recent content by swegmike

See weblink below on calculating spring load. I'm trying to determine what the max load for the safety/overload valve to open up is for my jack. Since my spring is black coated, I'm assuming the material is oil tempered. The Sears jack is 3ton (6000 lbs). The spring height unloaded and...

is their a dye (or UV) compatible with hydraulic fluid? If so, then it will be easy to track down hydraulic oil leaks.

Back around page 22 on the forum there was discussion on removing the stepped edge of the main RAM shaft since it causes drag. However, I wonder if one can put two different ucups in series in floor jacks. That is ucup #1 has one inner diameter, followed by ucup #2 that has the inner diameter...

On the stepped washer and seal, my 3ton Sears jack had an outside edge like yours on the backing washer used in the pump check valve and then the oring. Since I was not able to find a replacement stepped washer, I just went with a regular backing washer and oring as-is done nowadays. I wonder...

Well the label says 3000 lbs. So it 1.5 ton jack. As for the rivots, you may be able to match the rivet size with those in a hardware store, or take it to a machine shop for them to replace them. What does it say in the scratched area? Is there a model number or some product name in this area?

Does it matter whether stainless steel 304 or chrome ball bearings are used in the jack? They are about the same price. What is it called when a nlyon/teflon washer has the outside edge higher than the rest of the washer on the width? The reason I ask is I have one as if the washer was crushed...

windswept4 had posted around page 12 his tear down of a blackjack floor jack. It is a very close match to my Sears 3 ton jack. His safety valve is a needle/conical valve. See https://s1104.photobucket.com/user/windswept4/library/Hydraulic%20Floor%20Jack?page=1 However, he didn't do a tear down...

Yes my 3 TON Sears jack had 22x40x12mm ucup in it which was green. However, not all ucups are colored green (assuming the hydraulic oil didn't discolor it with age). The replacement was black, and some sites have blue. I don't think the color is added by the mfg as an indication of the type of...

When looking for UCUP seals for the main ram in my jack, I came across different types of UCUPS which are poly urethane. a. Some where symmetrical and others not. b. The other variation in ucups being sold as jack repair kits, are unloaded and loaded ucups. The pics in this forum are...

Since there has been discussion that a tool is needed to reset the safety/overload screw by the factory, I came across this posting on youtube where they show how its done. This is the only video I could find. I thought they put a measured weight on jack to calibrate the jack, but in this case...

Ok, I see what you did. Sigh! I did it the hard way.....

Right now, it doesn't have them. The inner screw is set to 2.5 turns based on readings on forum. I'll have to reset to 1.5 turns based on later postings. Currently it won't go up after orings and seals replaced, that was part of the problem along with leaking. So I'll have to turn the inner...

I tried to do that. Both ends of the springs were looped thru the holes in the power unit box. However, everytime, I raised the lift part to to get at them, the rod would extend since it was already attached to the rails with the tie rod pin. If, I tried without the rod attached to the rails...

3rd post. My Sears 3Ton jack 214.12300 is missing the safety/overload valve spring and needle valve, or the spring ball bearing and cap seat. I have the inner screw with *** which was screwed all the way down. I've had this jack since I bought it new, thus it came from the factory with these...

I have a Sears 3 Ton jack MFG April 1988. It has two heavy duty return springs that are easy to get off using a screw driver. However, getting them back on isn't easy particularly in the tight spaces and when one is on and there is tension from the first one while trying to get the second one...