Third photo--Spread the frame members to remove the handle and its yoke casting. Hydraulic bottle jack. Then I could wrestle the seal onto the ram the rest of the way.
Do not use motor oil or brake fluid. Ensure the ram piston contacts the load at a proper lift point. Carefully turn the screw plug until the valve assembly bottoms out. Fourth photo--Place the bottle jack unit in a vise and use a wrench to remove the plunger mechanism. On this jack a pin both holds the end of the spring and secures the block in the photo to the top end of the ram. If pressure is constant and area increases, force also increases.
Clean away any gritty pieces of dirt. Second photo--Install the conical metal seal in the hole for the release valve. Several times I feared I had ruined a vital part on my jack, or was about to do so, simply because I was without knowledge and experience related to rebuilding a floor jack. Finally, one day, the lift arm would not rise at all. Since pressure is the ratio of force to area, the ram piston's larger surface area will distribute a larger lifting force. How does a hydraulic jack work? Move your cursor over the text boxes in the first photo. Around 12 ounces was used to fill the jack. Brake fluid makes the seals swell.
Several firms sell rebuild kits for hydraulic jacks. A bottle jack is light enough to hold and operate as a horizontal hydraulic jack. The lift arm no longer rises when the handle is pumped up and down. View Cart & Checkout. While the bolts are still loose, put the handle's yoke in place. There must always be sufficient oil in the reservoir. The towel shows how much dirt was in my jack's oil. The jack has a vertical ram piston with a wide frame on top.
If you do not want to rebuild the bottle jack unit yourself, you can use either of these videos to remove the bottle jack unit from the frame of the jack and simply take it to a repair shop near you. It would be tough enough to remove the residue, but would not scratch the machined surface. Components of a hydraulic jack. However, the plunger piston only requires 150 N of force to push down. I first had to develop those in my mind. The Blackhawk Parts web page offers a few cautionary and a few safety notes, but no helps on the rebuild procedure for the Saturday mechanic. The cylinder would normally be removed for a rebuild. Inspect the seats in the bottle jack unit's body for signs of rust and pitting.
And, I do not want to risk losing any parts by opening the bag early and having something roll out. Step 9: The Plunger. Scroll down to the middle of the web page. ) See the text boxes on the first photo. My jack came with the Fleet brand name. No opened kits or installed parts may be returned for credit and no returns will be accepted after 30 days from date of shipment. The one on the right is recessed so far that it is not visible. Check the oil level to keep it at the desired level. The photo shows the parts kit I received. This video shows how to remove the bottle jack unit from the frame.
New plugs are included in the parts kit. I had to tap on the end of the wrench with a hammer to loosen it. The hydraulic floor jack, or trolley jack, consists of a horizontal ram piston pushing the short end of a bell crank. The third photo shows how this special tool is used. Push the plunger down and let the spring cause it to return.
I found some parts were not as easy to remove as I expected from videos and other helps that I linked earlier in this Instructable, and I had to make several special tools. First photo--I have a dental pick I can use to remove old seals. I kept a cup of cold water near my grinding wheel to avoid softening the bolt with heat. Porter-Ferguson Repair Kits. The old washer has compressed to fit very tightly. I found Blackhawk Parts and ordered parts on-line. At first this oil was cloudy. Insert the jack stands beneath the load next to the hydraulic jack and lower the load's weight onto the jack stands. I left the jack in this position for a few minutes. On my jack a 1 inch wrench was required. This extra oil may also be due to the jack evacuating air trapped inside the jack. That got it started. I kept the bag of parts inside the same shallow pan in which I assembled the bottle jack unit. Sixth photo--The rams from the jacks shown in the videos attach to the frame with a cotter pin.
5 mm, Red, Quality Replacement Part. Figure 2: The principle of hydraulic lifting devices (Pascal's Law): a small force (A), incompressible fluid (B), and a large lifting force (C). Beauty & personal care. Step 7: Further Disassembly. I used a wooden dowel rod to scrape and break loose any dirt I could find. I think this should adequately clean the jack so that it can be reassembled. Although it may seem redundant, I will also document all steps in this Instructable with photos and text so that anyone using it in the future will have all needed information, even if some of the better videos disappear one day. The bell crank's long arm connects to the lift pad, providing vertical motion of the load. From what I have read, forty years of service is a reasonable time for a hydraulic jack to operate before it needs a rebuild.
Conclusions--I did not find any clearly damaged seals in my jack, other than cracks in an "O" ring on part of the release valve, but it was a non-critical part. Install the new neoprene seal, rounded end first. Step 19: Troubleshooting and Conclusions. Owning and using a hydraulic jack is often a necessity.
I had to wrestle with this a little and take it in steps. Both holes have a large screw inside them. In order to do that at home, I carefully turned this screw and counted by half-turns until it bottomed out. It has a vertical lifting ram with a support pad at the top. If you choose to do it yourself, you will learn a lot, but it may require more of your time and be more difficult than you expected. Price is per EA: $13. Now tighten the locking nut (mentioned in connection with the first photo) in steps. Grocery & Gourmet Food.
I made a special tool for assembling the plunger body again. This one has two slots for a special spanner wrench. Hydraulic Press Repair Kits. Loosen the nuts on the axle for the lift arm considerably, but do not remove them. The pointed end goes in first.
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