Engineering giant Larsen & Toubro Limited's Construction & Mining Equipment Business Unit has launched the newly - developed Komatsu D39EX-21 Crawler Dozer in the Indian market. The first lot of dozers have been successfully deployed by customers for site development work and irrigation projects in Orissa, Andhra Pradesh and Madhya Pradesh. These machines, which offer superior power and dozing operations, are designed to work in general construction, site preparation, buildings, forestry, and utility applications.

The D39 frame is designed using advanced computer - aided engineering. The frame structure combines the main frame and track frame with connecting bars to deliver the ideal stiffness required in a small size dozer. Travel motors and final drives are mounted inside the track shoe for protection from rocks and stumps and for improving durability. The life of undercarriage and reliability are greatly extended by the use of large size links, pins, bushings, and unique dust seals.

L&T Launches D39EX-21 Dozer
Fitted with the SAA4D102E-2 turbocharged diesel engine, this dozer delivers 95hp output and meets the Tier-II emission standards. The dozer is equipped with hydrostatic transmission and consists of dual - path and closed - circuit with two variable displacement piston pumps and two 3-speed variable displacement travel motors. This allows the operator to select the optimum speed to match specific jobs.

D39 Dozer uses HST dynamic brakes to ensure safe operation. The newly developed 3-axis PPC valve and ergonomically designed joystick provide light operating effort and excellent blade response. PCCS (Palm Command Control System) joystick controls all directional movements. Hydrostatic steering eliminates steering clutches and brakes, providing smooth powerful turns.

The large ground contact area created by the long tracks and wide track gauges, combine with a low centre of gravity to make D39EX-21 a stable and well balanced machine that can perform precise grading work on rough as well as inclined terrain. The slim engine hood and well located operator seat provide excellent visibility to the blade. This clear blade visibility increases grading efficiency and reduces operator guesswork.

With the hydraulic closed - centre load sensing system, the blade lever stroke is directly proportional with blade speed, regardless of the load and travel speed. The benefits include precise and responsive operation due to the pressure compensation valve and reduced fuel consumption by discharging only the required amount of oil from the pump.

An electronic monitoring system prevents minor problems from developing into major ones. All meters and gauges are controlled by a microcomputer, which provides a wide indication range for an easier, more precise reading.

Thanks to its host of advanced features and productivity edge, the D39EX-21 Dozer has become a hit in the Indian construction industry in a short time and is here for many years to come.
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