Caterpillar Challenger

The register lists 7 versions with 138 to 236 kW rated output at 1,000 to 2,100 rpm. The six-cylinder engines come from the Caterpillar range with the type designations 3126 and C-9 and produce between 7,200 and 10,466 cm³ displacement. Operating weights range from 9,977 to 15,000 kg, lengths from 5,360 to 6,000 mm.

With its track running gear, the Challenger occupied its own market niche between classic wheeled tractors and bulldozers: the large footprint lowers ground pressure and allows fieldwork even on wet soils where wheeled tractors would sink in. Competition came chiefly from John Deere with its own tracked-tractor range.

When buying used, the wear condition of the track belt, rollers and drive wheels ranks among the most expensive checks, along with the tightness of the tensioning gear. On engines from the 3126 and C-9 families, it is worth checking the injection pump, turbocharger and cooling system; spare parts run through either the Caterpillar or the AGCO network depending on the build year.