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The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. 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 ...
The corresponding formula for a truck and trailer combination, used to determine the required D-value of a coupling, is: T = Weight of towing vehicle including the vertical load on the fifth wheel R = Total weight of the loaded semi-trailer U = Vertical load on the fifth wheel g = Acceleration due to gravity (assumed to be 9.81 m/s 2 )
All M809 models had a rear pintle hitch and could tow 15,000 lb (6,800 kg) trailers except the M816, which could tow 20,000 lb (9,100 kg) The M818 and M819 could tow 37,500 lb (17,000 kg) semi trailers on their fifth wheel. Many M809 series were equipped with a front-mounted 20,000 lb (9,100 kg) capacity winch, intended for self-recovery.
The M931 (M932 w/winch) was a semi-tractor used to tow semi-trailers up to 37,500 pounds (17,000 kg). A front-mounted winch was optional. Unlike commercial trucks the fifth-wheel could also pivot side to side, making a more flexible connection to the trailer. Even so, off-road performance was limited. [14]
The Tow package changes a few details in the powertrain, including lower axle gear ratios (from 3.63:1 to 3.81:1), a transmission oil cooler, a higher-capacity radiator, and an upgraded cooling fan.
This let the truck perform wrecker duties and to load and tow semi trailers. All had a front and rear winch. Oversize 12.00×20 were used, this was the only model to have this size. As a wrecker the boom could support 12,000 lb (5,400 kg), as a tractor the fifth wheel load rating was 15,000 lb (6,800 kg). [7] [19]
Braked towing capacity is the towing capacity of a vehicle if the trailer being towed has its own braking system, typically connected to the vehicle's braking system via the trailer cable. [3] Braked towing capacity is typically significantly greater than unbraked towing capacity. [3] Towing capacity may be measured according to the SAE ...
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