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The front beam axle was mounted on leaf springs, the rear tandem beam axles were mounted on a leaf sprung "walking beam" type suspension. All models shared a 181 inches (4.60 m) wheelbase (measured from the 1st to the 3rd axles). Full air drum brakes were used. The M123 was able to control the trailer brakes independently of the tractor.
It is a hitch setup mounted on the tow vehicle that uses spring bars and chains under tension to distribute part of the trailer's hitch weight from the towing vehicle's rear axle to the towing vehicle's front axle and to the trailer's axle(s). It can help reduce trailer sway and hop. Trailer hop can jerk the tow vehicle. Trailer sway is also ...
A conventional ladder frame has a front steering axle with a 12,000 lb (5,400 kg) weight rating and tandem rear axles with a 40,000 lb (18,000 kg) weight rating. The truck can have a maximum weight of 52,000 lb (24,000 kg), including a 30,000 lb (14,000 kg) load. The total weight rating of the truck and trailer is 105,000 lb (48,000 kg).
It could shift between low and high ranges while moving. In the low range the front axle is automatically engaged, in the high range the driver controls it. [11] The M809 series used Rockwell-Standard double-reduction axles with a 6.44:1 ratio. New production M939A2 use a similar Meritor model, also with a 6.44:1 ratio. Steering boxes and some ...
The Sterling 10.5 axle is an automotive axle manufactured by Ford Motor Company at the Sterling Axle Plant in Sterling Heights, MI. It was first used in model year 1985 Ford trucks. The axle was developed to replace the Dana 60 and Dana 70. The Sterling 10.5 axle is currently only made as a full floating axle.
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 ...
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Other powered axles are available from Dana-Spicer and Meritor. These have front mounted carriers and in tandems the two axle housings are different. Single rear axles rated at 23,000 pounds (10,000 kg) are available from Mack and Meritor. The Camelback tandem is the base rear suspension. The Camelback has multiple leaves that rock above the ...