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Explore Why is this plate on a semi truck covered in grease? Fifth wheel 🚛 #truck #fifthwheel #howitworks with 324,148 views, 4,308 likes, and 44 comments. Experience the impact of this video content that has captured audience attention.

The greasy plate behind a semi truck's cab is the fifth wheel. The front of the trailer rests on it and swivels on it in every turn. Grease cuts the steel-on-steel friction; without grease, the truck is harder to steer. Some fifth wheels have low-friction plastic liners and need no grease. The trailer is held by its kingpin, a steel pin under the trailer's nose. The common size is 2 inches (50.8 mm) across the neck, where the lock grips it; heavy-haul trailers use 3.5-inch pins. As the tractor backs under, the trailer rides up the ramps and the kingpin slides into the slot. In the design shown here, the pin turns a jaw that closes behind its neck, and a spring pushes a locking bar in behind the jaw. Other designs use two jaws or a sliding wedge. US rules (49 CFR 393.70) require the lock to close automatically on coupling and to stay closed until someone releases it by hand. To uncouple, the driver lowers the trailer's landing gear and pulls the release handle, which draws the locking bar out. When the tractor pulls forward, the pin pushes the jaw open and the trailer slides down the ramps. After coupling, drivers tug forward against the trailer brakes and then get out to look. The jaws should be closed around the neck of the kingpin, with no gap between the two plates. Manufacturers warn that a tug test or the sound of the lock can miss a bad coupling. A typical fifth wheel for a 2-inch kingpin is rated for 55,000 lb of vertical load and a drawbar pull of 150,000 lb. The name comes from horse-drawn carriages, where a flat wheel above the front axle let it turn. The animation exaggerates how far the trailer rises on the ramps so it's easy to see. Sources: California Commercial Driver Handbook, sections 6.4–6.5; California Highway Patrol, HPG 83.2, ch. 10; 49 CFR 393.70; JOST JSK37 operating and maintenance instructions; SAF-Holland FW35 specification and patent US 9,102,371; Fontaine LT-149 instructions; patent US 4,659,101 (Holland); SAE J700 and ISO 337; Wikipedia, "Fifth-wheel coupling". #truck #fifthwheel #howitworks

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