Posted by Paul in MN on May 24, 2010 at 07:53:02 from (71.210.144.152):
I should have added this to the earlier discussion, but as it has rolled back, I'm going to do this as a new thread.
A couple of thoughts about successful and safe lifting.
1) Make sure your jacks and their supports are in good level. When jacking up houses for moving, we even use a level on the ground pads to be sure they are level. Make sure your blocking above the jack is cut square if you are using it vertically. Keep the vertical extensions of the jack relatively short.
2) Wood members used as pads are likely to crush if used horizontally. Sometimes as they crush, they split and throw the jack sideways. Look at the grain of the wood and pick pieces that have tight grain. Wide grain is poor, weak and likely to split. Wood pads made from a decent 3/4" plywood are much less likely to split and crush. Good pieces of Oak work well.
3) Do not jack against the wood pads or house beams. The head of the jack will compress the wood or beam and begin failure. Use a 3/8" thick steel pad against the wood member to keep the wood from crushing. Spread out the forces.
4) Make a big pad on the ground to jack from. I'd guess from what you have described, that 2 ft by 2 ft would be good. The soil is unpredictable as to what it will support, so spread out the load.
5) If any of your supports begins to bend or twist, set up a jack and support system to both sides of the failing member. Do not suddenly release the lift pressure from a beam by taking out the failing jack, the beam may crack.
6) Do not trust hydraulic jacks to hold a steady load. They are notorious for leaking down in less than a day. So use them to lift and then provide support blocking with shims to tighten up the load against your blocking. Support blocking must not be left loose, but needs to be preloaded so it stays in place if failure begins.
7) Think "forces" and their directions. Extra blocking is much better than too little. Screw jacks hold, hydraulic jacks just lift but can not be trusted to hold.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
