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Originally called a laminated or carriage spring, and sometimes referred to as a semi-elliptical spring, elliptical spring, or cart spring, it is one of the oldest forms of vehicle suspension. A leaf spring is one or more narrow, arc-shaped, thin plates that are attached to the axle and chassis in a way that allows the leaf spring to flex ...
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.
A ladder frame with three live beam axles, the front on leaf springs, the rear tandem on leaf springs with locating arms. Brakes on the M39 and M809 were air over hydraulic with drum brakes on all wheels, M939s were full air. Many trucks were available with a front-mounted 20,000 lb (9,100 kg) capacity winch.
The M1 had a ladder frame with three live beam axles, the front on leaf springs, the rear tandem on leaf springs with locating arms. All models had a 181 in (4.60 m) wheelbase. The M1 weighed 27,330 lb (12,400 kg), the -A1 31,200 lb (14,200 kg). Brakes were full air, the tires were 11.00x20 with dual rear tires.
A multi-leaf spring consists of a series of flat plates, usually of semi-elliptical shape. The flat plates are called leaves of the spring. The leaf at the top has maximum length. The length gradually decreases from the top leaf to the bottom leaf. The longest leaf at the top is called master leaf. It is bent at both ends to form the spring eyes.
The M809 series had a ladder frame with three live axles, the front on leaf springs and the rear tandem on leaf springs with locating arms. [7] There were three wheelbases (measurements are from the centerline of the front axle to the centerline of rear tandem). The short (M810), used for tractors and dumps, was 167 inches (4.24 m), the ...
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