What Do You Call the Truck Part of a Semi?

The truck part of a semi is known as a tractor. A tractor is the engine, cab, axles, wheels, and transmission of a semitrailer truck. The trailer portion of a semi is equipped with an area for cargo and attaches to the tractor via a fifth-wheel coupling.

Tractors are typically powered by diesel engines, although there are some models that run on gasoline or alternative fuels. The cab of the tractor contains seating and controls for the driver and can be either integrated into the frame or separate from it. The axles provide support to the frame and distribute weight evenly across all four wheels when in motion.

The transmission system in a semi-truck’s tractor allows for gear shifting between high and low gear ratios to provide power in different road conditions. It also helps control how much power is going to each wheel, which is beneficial for cornering or navigating uneven terrain. Additionally, some tractors have automated transmissions which allow for greater efficiency and less fatigue for drivers over long distances.

The wheels of the tractors are typically constructed from aluminum or steel alloy, with some models having chrome-plated steel rims featuring spokes. Additionally, many heavy-duty tractor models come equipped with tires that are designed specifically to handle large loads while providing grip in slick conditions.

In addition to being used in semi-trucks, tractors can also be used as an independent vehicle for hauling goods over short distances or as part of heavy machinery such as bulldozers or excavators.

In conclusion, the truck part of a semi is known as a tractor. It consists of an engine, cab, axles, wheels and transmission and provides power to both the truck itself and its attached trailer by distributing weight evenly across all four wheels when in motion. Tractors can also be found in other applications such as independent vehicles or parts of heavy machinery.

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James Gardner