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2. ISO standards for trailer connectors - Wikipedia

   en.wikipedia.org/wiki/ISO_standards_for_trailer...

   24 Volt 7-pin trailer connector ISO 1185 (Viewed from back of plug where wires connect to pins) Physical design according to standard ISO 1185. [4] [22] This connector is common on heavy duty commercial trucks and trailers but is replaced by the ISO 12098 connector on newer vehicles. #

3. Trailer connectors in North America - Wikipedia

   en.wikipedia.org/wiki/Trailer_connectors_in...

   Flat 5-pin connector (Towing vehicle side) This contact is not as common, but is compatible with the 4-pin connector in the way that a towing vehicle with this connector can be connected to a trailer with the 4-pin flat plug. The extra connection is often used to block the surge brakes when reversing with the trailer. #

4. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   The trailer tongue (North America) or coupling (outside North America) slips over a trailer hitch ball attached to a receiver hitch mount or integral with the hitch. A larger, heavy-duty gooseneck ball size: 3 in (76.2 mm) is typically used for towing greater than 10,000 pounds (4.5 t), and this towing capacity falls outside of the scope of SAE ...

5. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The coupling consists of a kingpin, a 2-or-3 + 1 ⁄ 2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. As the connected truck turns, the downward-facing surface of the semi-trailer (with ...

6. Ballast tractor - Wikipedia

   en.wikipedia.org/wiki/Ballast_tractor

   Earlier coupling consisted of in house made metal hitch which had loops to lock drawbar eyes with a pin. Later fifth wheel manufacturers like Jost Rockinger and Ringfeder developed heavy-duty drawbar couplings with a 50 mm loop, drawbars and drawbar eyes which were built with higher quality and standards this increase the safety significantly ...

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