Question about Hand Tools
I have a Craftsman Professional 4-ton floor jack that I purchased a few years ago. I used it a couple times then stored it in the garage for the first winter. Since then, it will lift a car from the ground, but when I try to lift if off the jack stand, the jack will not lift the car. The speedy-lift feature still works, but once it gets to the car it will not lift. I assume there are different cylinders or valves for the two lift stages. Fluid is full and I followed the instructions to purge air out of the system. Any ideas would be appreciated.
It sounds like you have MAXED out the absolute HEIGHT that the jack is CAPABLE of extending to.
Try this to test this theory; Remember though before you !!EVER!! attempt to raise a vehicle with a jack, make sure that the vehicle is on FIRM LEVEL ground and that the JACK is likewise. Even if you have to slowely drive your vehicle a short distance in order to attain level ground, DO IT. THIMK! It could mean the difference between whether or not you live to tell about the flat you changed.
Get yourself a piece of 'treated' 2"x10"x 2' lumber which you will put in the trunk of your vehicle with your jack. It is now 'married' to your jack.
Chock the Tires on the opposite side of the vehicle that you will be working on. The weight of your vehicle will be redistributed when you jack up the vehicle. Even though you will have it in 'Park' you do NOT want it to move any at all. The chocks will prevent this.
Place that piece of lumber beneath your vehicle below the 'jack point'.
Place your jack squarely on this piece of lumber and slowly crank the jack up, keeping your eye on the jack point where the jack is in contact, until the tire is off the ground about 1/2 inch, any higher and you are just wasting energy and time. Once the tire leaves the ground it is high enough to remove from the vehicle. You may have to raise the vehicle up a bit more in order to replace the flat with a good tire. Be SAFE, Start low and work your way higher.
The REASON for the piece of lumber under the jack is to distribute the weight that is now bearing on the jack so that it does not depress into the ground. It also provides you with a stable platform to begin with and gives you TWO more inches of height to use with the jack if needed. Use it even if you are on asphalt because depending on the consistency of the asphalt material and how HOT is is from the current weather, the jack could settle a bit into the asphalt and this procedure could prevent this and keep you safe.
If you are using jackstands, use a piece of treated 3/4"x10" square, plywood under it as well to keep it from settling into the ground. Raise the vehicle only high enough to slip the jackstand under the portion of the vehicle where you will be placing it and still allow the tire to be removed.
Be SAFE and live to tell the tale. :)
Posted on Apr 26, 2009
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Posted on Jan 02, 2017
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