Posted by john in la on January 14, 2023 at 17:39:56 from (97.80.68.11):
In Reply to: Re: clearing snow. posted by caterpillar guy on January 14, 2023 at 16:26:05:
I do not know what kind of setup you have been around but I have been pulling A train IE double 28 foot trailers for 35 years and have never seen a setup where the pin can be unlocked and move the trailer.
I assume you are talking about the pin in the pintle hook. It comes out the front of the trailer pintle hook section and holds tight against the circle part of the pintle hook on the dolly. This pin is supplied air and activated when you release the brakes on the trailer. No turning it off or on at will. Brakes released activated brakes locked not activated.
While the pin holds tight it has nothing to do with backing or going forward. It is there to take up slack and keep the hitch point from moving around as you brake and take off. In other words it prevents slapping or jolting on the hitch point.
So with the trailer moving the pin is always out. It does created some resistance where the rear trailer will mostly turn on the 5th wheel it does not prevent the dolly from pivoting on the front trailer especially while backing up.
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