Caterpillar D9T Crawler Dozer

By Walt Moore, Editor | November 29, 2011

According to Caterpillar, new features for the Cat D9T crawler dozer enhance operator safety, comfort and convenience, while also refining the performance and productivity of this flagship model in the Cat crawler dozer range. Powered by a Cat C18 ACERT engine rated at 410 horsepower, and with an operating weight of more than 110,000 pounds, the D9T, says the manufacturer, can take on the toughest dozing and ripping jobs.

D9T cab environment

The D9T’s large, well-appointed cab features an electronic, low-effort, single-joystick blade controller, single-lever steering with integrated controls for travel direction and ground speed, a new automatic climate-control system, and Cat Comfort Series seats now available with heat and ventilation.  

For added safety, the new Dynamic Inclination Monitor provides readouts of the tractor’s pitch angle and side-to-side slope. In addition, a new operator-presence system locks out the power train and hydraulic system to avoid unintentional machine movement when the operator is entering or leaving the cab, assisted by redesigned steps, handles and guardrails.  

An available visibility package includes mirrors on the lift cylinders and a ROPS-mounted camera system with a 7-inch color monitor near the rear view mirror. In-cab sound levels are decreased from 79 to 77 dB(A), a significant change, and a new dash display, high-current 12-volt connector, IPOD/MP3 wiring and optional window shades add convenience.

An optional Automatic Ripper Control simplifies the operator’s job by keeping drawbar load constant and minimizing track slip. In addition, Automated Blade Assist uses blade-pitch presets to simplify positioning, and an optional Autocarry system automatically adjusts blade load during the carry segment.

The Autocarry feature can be integrated with optional Cat Grade Control systems, which automatically guides the blade to achieve design contours. Also available for the D9T is the Terrain for Grading system that can receive electronic site plans in real time to direct cut and fill operations.

Dozer design refinement, serviceability

New for the D9T is the Enhanced Auto Shift (EAS) system, which provides operator-selectable forward and reverse speeds similar to an automatic transmission. The EAS system, says Caterpillar, can provide increased production, fuel efficiency and ease of operation.

Cooling system refinements include a new radiator featuring an aluminum bar-plate design that is extremely durable and corrosion-resistant. A new air-to-oil hydraulic cooler results in lower hydraulic-oil temperatures for extended component life, and the D9T’s hydraulically driven, variable-speed demand fan provides optimal cooling, while using less power, reducing fuel consumption and lowering sound levels.

The new “OK-to-Start” system electronically checks power-train, engine coolant and engine oil systems. The ground-level service center in the left fender allows quick access to various controls and information sources commonly used on a daily basis. The VIMS 3G (Vital Information Management System), which can use both cellular and satellite networks, monitors the D9T’s health and working conditions in real time and provides machine history for off-board analysis.

Cat D9T Crawler Dozer Specifications

  • Net power: 410 horsepower
  • Operating weight: 110,500 pounds
  • U Blade capacity: 21.4 cubic yards
  • SU Blade capacity: 17.7 cubic yards
  • Steering: electro/hydraulic differential