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Discussion Forum

Re: Chain size

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John Schoenauer

12-28-2011 17:18:00

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Thanks for the replies. The tractors I have are an 880 Oliver and a 77 Oliver with loader. Transport will mostly be from home to our farm. About the chain size (3/8 vs. 5/16) what do the DOT boys look for other that chain load rating. Do they compare load vs. rating, example for the 6000 # tractor does each chain need to be able to handle the load? I have talked to a DOT officer and he suggested that it would be good to use 4 separate chains instead of 2. I didn't ask about chain size. They gave me a book but I can't find anything about chain regulations.

Thanks again

John Schoenauer

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12-29-2011 04:16:40

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 Re: Chain size in reply to John Schoenauer, 12-28-2011 17:18:00  
This will help on chain sizes, and how much WLL you need pulling in each direction.

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John in La

12-28-2011 17:55:09

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 Re: Chain size in reply to John Schoenauer, 12-28-2011 17:18:00  
Chain laws are covered in DOT rules 393.100 to 393.136
I do not know your state laws so I will use federal laws.
Federal law says you need 2 chains for equipment less than 10,000 lbs. Some states say you need 4. Four seperate chains and binders is not a bad idea.

You need to tie down with a downward force of 20% of the weight. Just make the chains very tight and this will be covered.

You need to chain the rear to hold 0.8 g deceleration in the forward direction; This means you need 6000 lbs X .8 = 4800 lbs of chain on the rear. Two 4700 lb chains will be over kill. Heck 2 grade 70 1/4" chains rated at 3150 lbs would be enough.

You need to chain the front to hold 0.5 g acceleration in the rearward direction; and 0.5 g acceleration in a lateral direction.
That is 6000 lbs X .5 = 3000 lbs of chain rating.
One chain would be enough if you use 5/16 grade 70.
The trick with using 1 chain on each end is holding lateral movement.

So lets say you get 4 chains (5/16 grade 70) and binders. One on each corner. You now have 4700 lbs X 2 of hold down on each end (9400 lbs). You only need .8 on the rear so you could haul a tractor over 11,500 lbs with those 4 chains.
11,500 X .8 = 9200 lbs.

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