The Hi-Drive D6H was introduced in 1986 along with 3 other H-Series track-type tractors.They were replaced after 60,000 had been built in 1959 with the D6B.

A Variable Pitch Angle and Tilt ('VPAT') is a straight blade which has the ability to change the pitch of the blade (leaning forward or backwards) as well as the ability to hydraulically raise, tilt and angle the blade.A 'S-U' combination blade which is shorter, has less curvature, and smaller side wings.A Universal Blade ('U-Blade') which is tall and very curved, and has large side wings to carry more material.A Straight Blade ('S-Blade') which is short and has no lateral curve, no side wings, and can be used for fine grading.The dozer blade on front of the tractor can come in different varieties: The D6 ? with 185 hp of gross power and an operating weight of 18 tons is in the middle of Caterpillar's track-type tractors.This was the first D6 with Caterpillar's elevated drive sprocket undercarriage, known as the CAT Hi-Drive system. This configuration is typically used in fine grading applications. A ripper with a single or multiple shanks can be added to the rear of the machine to break up hard soil or rock.A hydraulic winch can be outfitted on the rear of the machine for towing or pulling.The rear of the machine can have large slabs of steel to add weight to the rear of the machine to aid in heavy dozing applications.The rear of the machine can be outfitted with various work tools to compliment the front blade.

Caterpillar D6c Serial Numbers