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You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise. Login to Your Account. Remember Me? Register Forgot password? What's New? Results 1 to 18 of Thread: Duff Norton aluminum ratchet jack. Thread Tools Show Printable Version. Duff Norton aluminum ratchet jack Had this old jack so long I almost cant remember what was wrong with it.
I only think about whenever I stick my forklift. It goes up fine but it wouldn't ratchet down. If I remember it dropped. Then I heard maybe is supposed to drop. Any one know? You run the dogs by hand to lower the load.
That's what the knobs are for sticking out of the side. They have a quick drop feature when you pull the lower dog all the way back. Those jacks are an excellent IQ test. Monarchist , cranium , Ray Behner , digger doug liked this post. Most likely what you have is a track jack also known as a railway jack.
These jacks therefor have no provision for ratcheting the load down. There are very similar jacks made by simplex and by duff norton that are used by riggers that can raise and lower the load by ratchet. These are often mistakenly called railway jacks but more correctly they are called toe jacks or sometimes riggers jacks. At first glance both types appears nearly identical but a track jack does not have the reversing leaver to slowly lower the load.
Although examples given are both 5 ton they can be found in varying capacity and heights. The Duff norton jacks have not been made in some time but the simplex jacks still made and readily available from industrial suppliers.
Originally Posted by Garwood. Looks like I was trying to fix something thats not broke. Could you explain the procedure of running the dogs? Originally Posted by boggie. Monarchist liked this post. I bought one of those without knowing how it worked.
I figured it out like you are, and used it. The last stroke upward dropped the load. I also had mine for a long time without using it. A journal jack was designed to get underneath the journal boxes or truck frames on railroad rolling stock and locomotives. The Duff Norton jacks are damned near bulletproof so long as they are not submerged in water or allowed to rust solidly. Being a mechanical jack with a heavy jack screw, they have no seals to deteriorate or leak by, and no hydraulic oil to be lost, nor do they have any close-clearance fits such as pump or ram pistons.
I have no idea if Duff Norton has any spec on the lubricant to fill these jacks with. We've used a semi-fluid Mobilith gear grease, a product formulated for old gearboxes with either no seals, or seals that are shot. The air operated jacks from Conrail had not been used since Noah had the Ark up on blocking. They were set up solidly. That was over 25 years ago, and while the jacks see only very occasional use, they are stored indoors and never needed any further attention.
Another handy Duff Norton jack is the what we call a 'toe jack' or a 'track jack'. These are rack type jacks, and are equally rugged. We use them for machinery moving as well as railroad work. As long as you have a 5 or 6 foot pinch bar or 'turning bar' to work these jacks, they seem to have incredible capacity. Duff Norton also makes a variety of screw jacks, including what I call "house jacks"- the timeless design of a cast-iron pedestal base with a heavy square thread jack screw.
These were designed for levelling houses or machinery erecting work. I've got a couple of them that I bought for a 2 bucks apiece at yard sales where people just wanted to get rid of them. If my memory serves me properly, the Duff Norton jacks of the type Magnetic Anomaly has use a buttress type of thread on the jackscrews and nuts. As a student at Brooklyn Technical HS, I learned about 'power transmission threads' including the buttress type threads. I think the only time I ever saw a buttress type of thread was when we had the air operated locomotive jacks apart.
Duff Norton did try to make life a little easier for the people who had to use their high capacity jacks, offering some models with cast aluminum bodies. The older D-N jacks had cast iron bodies, and the bigger ones even had wheels so you could move them around without killing yourself. I love air operated Duff Nortons. It was froze tight. I couldn't get the transmission to free up. What a robust jack and heavy of course. After freeing up everything but the transmission I gave up. We have a supply of air jacks so nobody uses the old mechanical ones and we have a pile of them too laying around that are not froze up.
I could of welded the cracks but just felt this one should not be trusted with the base spiderweb cracks. Was very interesting project but I had to move on.
I have a ton air jack in my shop but have never used it here on the farm. At Essex there is a step from one building to another that is about two feet drop.
I could get the air jack on wheels just about over the top going up but had to have a younger guy finish getting it up to the upper level. I broke my back in Dec last year slipping on the black ice. So I don't think I will be moving them around for a while. Getting stronger but won't try the big step thing again.
A lot of things I can no longer think about doing. Manhandling Duff Nortons included. Going to try and post some pictures of the "innards".
Mine is still disassembled on my own scrap pile. MC said no need to bring back the remains. Miss the whine of the air jacks. Would make a good alarm for a wake up alarm clock.
Couple winters ago I saw an ad for four Duff Norton air jacks. Two were ton cap. Two worked right away. A third one had a lot of water in the bottom and blew nasty snot out the muffler. I tried a bunch of solvents and fuel oil to loosen things up. The air motor was close I thought to running. I bought them though another guy payed for them.
They are now standing by at two different restoration sights. The fourth jack had a snapped bolt in the jack body and was going to take a little work but should run. My 5 HP Champion air compressor could get the jacks up or down a few inches before the jacks quit. They take a good amount of air. Complete the form below and we will get back to you ASAP, with a product quote and further information.
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