Crawler Tractor and Pipelayers (Sideboom): Equipment Spotlight

January 2012, Vol. 67 No. 1
The John Deere 850K crawler dozer

The PL61 Pipelayer provides 40,000 pounds of lift-capacity. The PL61 features a Cat C6.6 ACERT engine, closed-loop hydrostatic drive system, oval-track SystemOne undercarriage and an electronically enhanced operator station. The pipelayer also maintains hydrostatic draw-works, two-speed load line and extendible counterweight. Available with either a canopy or an optional enclosed cab, the PL61 operator station features a pair of seat-mounted, electro-hydraulic joysticks designed for intuitive control of travel and lifting functions. The operator station provides clear lines of sight to all work areas, including the boom and upper block, which are visible through a new roof-mounted skylight. The 18-foot boom is constructed of high-tensile-strength steel, allowing a robust box-section design that is durable, yet lightweight to optimize payload capacity. The hook and cable-controlled boom are raised and lowered by independent hydraulic winches designed for smooth operation and infinite speed adjustment through their working range. Two-speed operation of the load-line winch provides high speeds for overall productivity, but lower speeds for precise positioning. plmcat.com

Liebherr Construction Equipment
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Committed to bringing breakthrough products that make a real contribution to the earthmoving industry the PR764 Litronic has been carefully engineered. This crawler dozer delivers maximum pushing power and ripping force in all speed ranges regardless of the surface. It has an operating weight of up to 52.5t and features a new revolutionary drive concept: the D9508 310kW / 422hp Liebherr V8 diesel engine drives the crawler by means of four variable displacement pumps and engines, each in a closed circuit. A redesigned operator’s cab is ergonomically designed to provide maximum comfort and safety. In addition, Liebherr has implemented air conditioning as a standard feature to ensure operator comfort for a full day’s work. Noise levels are reduced even further by the low-revving 1,600-rpm engine and the demand-controlled hydrostatic cooling system. 757.245.5251, liebherr.com