Hey Old, you'd be suprised how much force can be applied with a screw (ie - puller). You say you had a 4 ton ram on the pin and that NO puller can apply that much force. Hate to tell you but OTC, and others, makes pullers with WAY, WAY more pulling/pushing power than 4 tons. Personally I've got one that is rated at 30 tons and several alot smaller than it is that are rated at least 5 tons. Beyond that, and maybe it's more of a 'special tool' than a puller, per se, but I've also got the rams and legs for pulling sprockets on CAT final drives. The two rams are rated at something like 75 tons puch and 73tons pull on the smaller one, and 103 tons push and 100 tons pull on the larger one.
Like I said there are many pullers/pushers that will do way more than the 4tons your talking about.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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