Posted by ScottyHOMEy on July 20, 2010 at 06:06:26 from (71.241.197.3):
In Reply to: Tieing down an M/MD posted by BruceS. on July 20, 2010 at 05:02:46:
Rusty is on it. A conventional eyebolt could fail as he described. They do make them for the setup you were thinking of -- they will have a flare/flange between the threaded portion and the eye, which needs to be threaded down tightly against the surface. BUT . . . even with those your greatest strength is on a straight pull. You lose strength as the angle of your chain to the centerline of the threaded shaft increases.
Around my neighborhood, the tow hooks off the front of old Chevy pickups are a popular for bolting on as anchor points. You can loop them through the bend in a chain or simply use a sling hoook on the end of your chain to grab onto them.
I have no idea how much hauling experience you have, but as far as your casting or frame rails failing, the key to avoiding that is to make sure your chains are always TIGHT. What overstresses and breaks things is sudden jolts, like having the tractor rock back and forth on any slack in the chains as you speed up and slow down, go from uphill to down . . . With the chains tight, that movement is eliminated. Any sudden change in speed will be absorbed by the whole tie-down system. Straps obviously have some spring in them, but so do chains (you can actually stretch and wear them out).
As long as your straps and chains (including any hooks) on each end of the tractor are TIGHT and rated for at least half the weight of the tractor, you'll be fine. As far as bolts, my preference is for Grade 5s. If you should meet a situation that stresses them severely, to the point that they need to be replaced, they will have given rather than breaking or shearing. A Grade 8 bolt in the same severe application might break or shear rather than give.
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