Cat has a name for reliability, and the D9T is a classic dozer with a proven reputation for long life and durability under even that harshest of conditions.
The latest incarnation of their most trustworthy bulldozer has several new features that enhance the machine’s performance, productivity, convenience and safety for the operator, as well as machine serviceability.
First up, the new dozer weighs in at 48.3 tonnes, powered by a Cat C18 ACERT engine, which meets Tier 4 Final/Stage IV emissions standards.
At the business end of the equation this engine delivers 436 net horsepower (325 kW) at 1,800 rpm.
A high torque rise of 36 per cent allows the D9T to power through toughest of material, and with 3.47 metres of track on the ground, the grip is tenacious.
The new dozer is also defined by a new high-efficiency cooling system, advanced electronic controls for the power train and hydraulics, and inside the cab things are much quieter with quality soundproofing, and enhanced information monitoring makes for safety and serviceability refinements to make the operator’s life far easier.
The new D9T combines these unique design enhancements with all of the predecessor’s premium features, including 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, as it only achieves emissions levels equivalent to Tier 2 and Tier 3 standards.
Cooling efficiency is enhanced with a new aluminium bar-plate radiator, which also adds durability and increased resistance to corrosion.
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.
For improved transmission shifting performance, the new Advanced Productivity Electronic Control System (APECS) provides a higher level of comfort for the operator, while increasing productivity through speed of operation.
APECS works in conjunction with the Enhanced Auto-Shift system, which automatically selects the optimum gear to engine-speed match, based on load and ground speed, to increase productivity and fuel economy.
The transmission also features an electronically controlled main relief valve, which reduces pressure during idling to save fuel.
Getting to the business end of the machine, Automated Blade Assist (ABA) allows operators to select pre-set blade-pitch positions for the dig, carry, and spread portions of the operation.
ABA is now standard with the D9T dual-tilt dozer blade option.
An autocarry system automates blade lift when carrying loads longer than 30 metres, which automatically positions the blade to minimise track slip.
The Adaptive Load Select system also enhances autocarry, which automatically adjusts the blade load based on factors such as soil type, moisture content and track performance.
Automatic Ripper Control also adjusts ground speed and ripper depth to minimise track slip.
For easy positioning of the blade’s cutting edge, the Cat Grade Control 3D system provides precise, automatic control with no blade-mounted masts and cables.
The 3D system reduces the need for grade staking and grade checking, meaning less need for people on the ground, means less risk and lower staffing costs.
Inside the cab, a new multi-colour, touch-screen information display enables the operator to monitor machine performance and adjust various parameters to suit task.
The work monitor screen provides real-time information about machine performance.
The D9T also features a new 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 ears 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 centre provides easy access to the electrical disconnect switch, which has built-in lockout capability, the engine shut-down switch and jump-start receptacle.
The D9T also has strategically placed anchorage points to enhance safety for service personnel work when performing repairs and maintenance.
Further simplifying the routine service, end-pin bearings on the equaliser bar can now accept grease and are serviced from one convenient location, a design that significantly extends component life and lowers maintenance costs.