The Cat D9T dozer has several new features that “enhance performance, productivity, operator convenience and safety, and serviceability” according to Caterpillar. The new dozer features a Cat C18 ACERT engine, which meets Tier 4 Final/Stage IV emissions standards, and delivers 436 net horsepower (325 kW) at 1,800 rpm. High torque rise of 36% enables the dozer to power through tough material. A new high-efficiency cooling package, advanced electronic controls for the power train and implement hydraulics, quieter cab with enhanced information monitoring, and safety and serviceability refinements define the new D9T.
The new D9T combines these design enhancements with its predecessor’s premium features—a durable mainframe with cast steel main case; pivot shaft that transfers blade loads directly to the mainframe; modular drive train with three-speed power-shift transmission and differential steering system; heavy-duty undercarriage with track roller frames and bogie-suspended rollers; a wide selection of blades; intuitive controls; and expansive visibility. The previous D9T model is still available in less regulated countries and can achieve emissions levels equivalent to Tier 2 and Tier 3 standards.
A new aluminium bar-plate radiator combines enhanced cooling efficiency with added durability and increased resistance to corrosion. In addition, a new air-to-air aftercooler cools combustion intake air to increase combustion efficiency and fuel economy, and a new air-to-oil hydraulic cooler precisely modulates temperatures for optimum performance and component longevity. The new Advanced Productivity Electronic Control System (APECS) is designed to improve transmission shifting performance, providing a higher level of comfort for the operator and increasing productivity. APECS works in conjunction with the Enhanced Auto-Shift system, which automatically selects the optimum gear/engine-speed match, based on load and ground speed, to increase productivity and fuel economy. In addition, the transmission features an electronically controlled main relief valve to reduce pressure during idling to save fuel.
Available blade-control technology—assisting the D9T’s productivity and simplifying the operator’s job—includes Automated Blade Assist (ABA), which allows operators to select pre-set blade-pitch positions for the dig, carry, and spread portions of the cycle. ABA is standard with the D9T dual-tilt dozer blade option.
Autocarry automates blade lift during carry segments longer than 100 feet (30.5 m), and it automatically positions the blade to minimise track slip. Enhancing Autocarry is the Adaptive Load Select system, which automatically adjusts blade load based on factors such as soil type, moisture content and track performance. In addition, an available Automatic Ripper Control adjusts ground speed and ripper depth to minimise track slip. And for ultimate blade control, the Cat Grade Control 3D system provides precise, automatic positioning of the cutting edge and requires no blade-mounted masts and cables. The system reduces the need for grade staking and grade checking, which reduces the need for people on the ground and consequently enhances safety while lowering costs.
A new multi-colour, touch-screen Information Display allows the operator to monitor machine performance and adjust machine parameters to tailor performance to the task. The Work Monitor screen, within the Information Display, provides real-time data about machine performance to optimise productivity. New for the D9T is a seatbelt reminder that illuminates an in-dash icon when the machine is started, and it adds an audio reminder if the machine is placed in gear without fastening the belt. Sound suppression packages are available to reduce average sound pressure at the operator’s ear to 74 dB(A) and spectator levels to 110 dB(A).
To enhance work site safety, a number of lighting packages are also available, including halogen, high intensity discharge and LED. Access and egress lighting controls are conveniently positioned and allow lights to be programmed to best suit the situation. A ground-level service center provides easy access to the electrical disconnect switch, which has built-in lockout/tag-out capability, the engine shut-down switch and jump-start receptacle. The D9T also has strategically placed anchorage points to help service personnel work safely when performing repairs and maintenance. Finally, to further simplify routine service, the end-pin bearings on the equaliser bar now accept grease and are serviced from one convenient location. The new bearings are designed to significantly extend component life and lower maintenance costs.
