Allis-Chalmers 7580-8550

Allis-Chalmers bought 440 Landhandlers from Steiger, but at the same time was developing its own articulated four-wheel-drive tractor. The 7580 was completed in 1976. Of its parts, 73% were shared with the 7000 series two-wheel-drive tractors. The engine was a version of the 7080’s engine boosted by 10 horsepower. For the first time, Allis announced an increase in torque: 29.9%. The transmission was a 20+4 Power Director with a 2-speed quick shift. The total output of the hydraulic pumps was 284 l/min, of which 87 l/min served the load-sensing system for the external hydraulics—the largest share went to the articulated steering. There were three hydraulic blocks as standard, and flow control could be adjusted from the cab. The lift had draft sensing and lifting power was the same 3 tons as in the smaller 7000 series models. The Acousta Cab II was similar to that of the smaller models, with a noise level of 79 dB. There were no steering brakes.

In the summer of 1977, the 300-horsepower 8550 was introduced alongside it, marking the switch to a black frame. The engine was Allis’s own 12.0-liter 6-cylinder with two turbochargers and four-valve technology. The lift was considerably more robustly built, and the lifting power was 4.4 tons.

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