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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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