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Old 09-01-2014, 05:13 PM   #1
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Drag Chain - Tire Chain Discussion

For those of you who have spray foam under your trailers, does it cover the axles? We are going to have to attach a drag chain to the axle for winter driving and I am wondering if I have a problem.
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Old 09-01-2014, 05:30 PM   #2
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Ye, the entire under carriage is covered, front to rear, including frame and axle, located within the frame. There is about 6-9 " axle outboard exposed between the wheel and frame. What is a drag chain?
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Old 09-01-2014, 09:02 PM   #3
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Originally Posted by cpaharley2008 View Post
Ye, the entire under carriage is covered, front to rear, including frame and axle, located within the frame. There is about 6-9 " axle outboard exposed between the wheel and frame. What is a drag chain?
Not good news. A drag chain hangs off an axle providing drag and directional stability so the trailer won't jackknife when descending steep, slippery roads.
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Old 09-01-2014, 09:16 PM   #4
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Not good news. A drag chain hangs off an axle providing drag and directional stability so the trailer won't jackknife when descending steep, slippery roads.
Not sure what CPHarley meant. I included some pictures of mine. While the underside is coated, it does NOT rest on the axle. There is room around all sides of the axle on mine. If the drag chain is to be placed over the axle, there would be room on mine.
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Old 09-01-2014, 09:24 PM   #5
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Thought that would be really bad if the foam were on the axle.
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Old 09-01-2014, 09:26 PM   #6
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A drag chain hangs off an axle providing drag and directional stability so the trailer won't jackknife when descending steep, slippery roads.
Like a sea anchor on a boat? I can't imagine doing that... why not just use trailer brakes? Also, I think it would be more effective attached to the end of the frame than to the suspension. By the way, the square tube of a Torflex is not at the axle line... it is ahead of it by six inches.
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Old 09-01-2014, 09:49 PM   #7
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Long haul truckers use a drag chain to ground the chassis electrically. Can often see them on gasoline tanker trucks. I can't imagine it would do anything for stability as the coefficient of friction between a moving chain on asphalt has to be very low. From a retired mechanical engineer....
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Old 09-01-2014, 10:31 PM   #8
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Originally Posted by Brian B-P View Post
Like a sea anchor on a boat? I can't imagine doing that... why not just use trailer brakes? Also, I think it would be more effective attached to the end of the frame than to the suspension. By the way, the square tube of a Torflex is not at the axle line... it is ahead of it by six inches.
Square tube? Our Torflex is mounted clearly in a round tube as evidenced by the pictures I posted. Not sure what was meant.
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Old 09-01-2014, 10:32 PM   #9
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I have to say being from a part of Maine that sees avg 12 foot of snow a winter , and growing up / living on the North East Coast I have never heard of this use for a drag chain. We used them on skidders and trucks etc in the woods in case they got stuck we could haul them backwards but never drove on a road with them.

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Old 09-01-2014, 10:45 PM   #10
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Square tube? Our Torflex is mounted clearly in a round tube as evidenced by the pictures I posted. Not sure what was meant.
I think he means the interior torsion bars. My understanding is that a Torflex suspension contains the square bars which are encased in the outer crossmember tube. They are offset forward of the axle spindle line as Brian mentioned earlier -- about 6 inches.
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