With a weight of 70 tons and boasting 524 horsepower, the HD-41 crawler tractor made headlines as the largest built up to that time. Allis-Chalmers gave at-tendees a taste of things to come at the ...

One-of-a-kind 1913 prototype Bullock Creeping Grip crawler tractor with its rare Heer opposed-piston engine gets cranking.

LAKE TOWNSHIP – A vintage Cletrac Crawler farm tractor returned to its roots over the weekend. Restored and retired from its labor of long ago, the tank-tread farm tractor was brought Saturday morning ...

How has NASA kept a vehicle 80 times larger than a fully-loaded tractor-trailer running since the Johnson administration? A stellar maintenance program. And lots of lubrication. Anyone who works on ...