Equipment Question, Doubles Dolly Connections

Topic 23690 | Page 1

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Robert W.'s Comment
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Rolling along in traffic I saw a tractor & trailer pulling a dolly for connecting a 2nd trailer. On it I saw the usual red, blue, and green lines for air & electrical, PLUS, a yellow line... what’s the yellow one?
Robert D. (Raptor)'s Comment
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Robert W.

I googled your request, and found no one who knows. One suggested that it might be either a hydraulic line or maybe they didn't have a blue hose and substituted it for the blue line. I told him it was in conjunction with the regular three, they he said no clue. So I don't know what it could be used for.

Was it a usual big rig hauling a box truck or was it a specialized truck?

HOS:

Hours Of Service

HOS refers to the logbook hours of service regulations.
Bobcat_Bob's Comment
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I thought finally a question in my wheel house, but I have no idea we do not have them and I have never seen one. I am guessing it is specialized for their application my guess is hydraulic related as stated above.
Grumpy Old Man's Comment
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I thought finally a question in my wheel house, but I have no idea we do not have them and I have never seen one. I am guessing it is specialized for their application my guess is hydraulic related as stated above.

Possibly a hydraulic line for a live floor motor?

Bobcat_Bob's Comment
member avatar

double-quotes-start.png

I thought finally a question in my wheel house, but I have no idea we do not have them and I have never seen one. I am guessing it is specialized for their application my guess is hydraulic related as stated above.

double-quotes-end.png

Possibly a hydraulic line for a live floor motor?

Possibly, I've seen dump trucks pulling doubles maybe they use it.

Doubles:

Refers to pulling two trailers at the same time, otherwise known as "pups" or "pup trailers" because they're only about 28 feet long. However there are some states that allow doubles that are each 48 feet in length.
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