D6N^Non-Current

Cat® C6.6 Engine with ACERT™ Technology

The Cat® C6.6 is a 6.6 liters (403 in3) displacement, six cylinder, inline configured engine equipped with a Caterpillar Common Rail fuel System. It uses ACERT Technology, a series of Caterpillar engineered innovations that provide advanced electronic control, precision fuel delivery and refined air management, resulting in outstanding performance and lower emissions. The Cat C6.6 with ACERT Technology meets the U.S. EPA Tier 3, European Union Stage IIIA and Japan MOC Step 3 emissions standards.

Design

The C6.6 features a compact design with heavy-duty engine features for outstanding durability, reliability and performance. The C6.6 incorporates a new cross flow cylinder head design, a 4 valve head and an ADEM™ A4 electronic controller.

Electronic Controls

The C6.6 engines use advanced electronic controllers, which have a proven track record for performance and reliability. ADEM A4 Electronic Control Module (ECM) receives data from engine-mounted sensors and adjusts critical parameters to maintain optimum performance. These adjustments also optimize fuel economy and emissions compliance. Electronics also make engines easier to troubleshoot and repair

Fuel Delivery

Fuel is introduced in the combustion chamber in a number of precisely controlled microbursts. Injecting fuel in this way allows for precise shaping of the combustion process. The ADEM A4 module directs the injectors to deliver precise quantities of fuel at exactly the right times during combustion for optimum efficiency and performance.

Air Management

The C6.6 uses a turbocharger fitted with a smart waste gate to give precise control of the boost pressure. Over the entire engine operating ranges the result is improved: Throttle response, Lower fuel Consumption and optimized engine performance. A new cross-flow design in the cylinder head facilitates air movement, while tighter tolerances between the piston and cylinder liner are reducing blow by gases.

Turbocharged and Aftercooled

A well-matched turbocharger and air-to-air aftercooler results in higher power while keeping rpm steady and exhaust temperatures low.

Electric fuel priming pump

A standard electric fuel priming pump is located in the primary fuel filter base above the combined water separator / primary fuel filter. A switch enables to easily prime the fuel system after a fuel filter service.

Torque Rise

The direct injection electronic fuel system provides a controlled fuel delivery increase as the engine lugs back from rated speed. This results in increased horsepower below rated power. A combination of increased torque rise and maximum horsepower improves response, provides greater drawbar pull and faster dozing cycles.

Multi Velocity Program (MVP)

Caterpillar's Multi Velocity Program (MVP) allows operators to choose from five different speed ranges in both forward and reverse, increasing machine productivity, decreasing fuel consumption and significantly reducing operating costs. Selectable operating speeds have been optimized to provide the best performance, fuel economy and drawbar pull. The engine speed in each speed range adapts automatically to provide a smooth, comfortable and performing machine. Operator speed ranges are independently selectable in both forward and reverse from 1.5, 2.0, 2.5, 3.0 and 3.5.

Auto-Shift/Auto-Kickdown

Auto-shift allows the operator to pre-select a forward and reverse speed range for easy, efficient directional changes.Auto-shift settings include:
• 1.5 forward to 2.5 reverse.
• 2.5 forward to 2.5 reverse.
• 2.5 forward to 1.5 reverse.
Auto-kickdown allows the transmission to automatically downshift when significant load increases are detected.

Electronic Clutch Pressure Control

The D6N has an additional transmission shifting feature for added performance and operator comfort – the Electronic Clutch Pressure Control (ECPC). This unique feature provides smoother shifting by regulating and modulating the individual clutches based on current operating conditions.

Steering and Transmission Controls

The D6N Differential Steering system delivers the control the operators need for all applications. Soft touch buttons located on the steering controls shift the electronically controlled transmission.

Torque Converter

The D6N single-stage torque converter efficiently responds to changing load conditions by providing torque multiplication, therefore increasing drawbar pull. It provides protection to the drive train components by preventing shock loads from heavy dozing applications. The torque converter is efficiently matched to the power train components and provides the superior performance you need.

Transmission

The proven planetary powershift transmission features five speed ranges forward and five speed ranges reverse and utilizes large diameter, high capacity, oil cooled clutches. To maximize the life of the transmission, the planetary design distributes loads and stresses over multiple gears.
• Controlled throttle shifting regulates engine speed during high-energy directional shifts for smoother operation and longer component life.
• The transmission and bevel gear set are modular by design, and easily slide into the machine's rear case, even with the ripper installed.
• Forced oil flow lubricates and cools clutch packs to provide maximum clutch life.
• Load compensating shifting provides smooth engagement of the clutches under loaded conditions.

Brakes

Oil cooled, hydraulically actuated, brakes provide higher torque capacity and increased service life.

Elevated Final Drive

• Isolates final drives from ground and work tool induced impact loads for extended power train life.
• Keeps sprocket teeth, bushings and final drives away from abrasive materials and moisture.
• Caterpillar uses single reduction planetary final drives in the D6N providing long-lasting performance and durability.

1) Steering Control

Differential Steering Tiller Bar control system provides simultaneous one-handed steering and transmission control.

2) Differential Steering Motor

Bi-directional hydraulic steering motor activates the dual differential, which changes the speed of individual tracks. Slowing one track and increasing the speed of the other track achieves a smooth power turn.

3) Power Shift Transmission

Proven planetary design provides fast smooth speed changes while distributing loads over multiple gears for long life.

4) Final Drive

Caterpillar elevated final drives provide isolation from ground or work tool impact loads, extending service life.

5) Brake Assembly

Oil cooled large diameter brake discs provide long service life.

6) Engine

Caterpillar® C6.6 Diesel Engine with ACERT Technology meets current engine exhaust emission regulations.

7) Torque Converter

Efficient torque converter provides torque multiplication for increased drawbar pull and protects the drive train from shock loads.

8) Radiator

Aluminum bar plate radiator provides excellent heat transfer.

Tiller Bar Control System

The tiller bar control system allows for simultaneous comfortable, one-handed steering, direction and transmission control.
• The differential steering tiller bar has easy touch shift buttons for upshifts and downshifts.
• The farther the tiller bar is moved, the tighter the turn.
• To change machine direction, operators rotate the tiller bar clockwise for forward or counterclockwise for reverse. Neutral transmission position is in the middle between the two.
• Low tiller bar efforts assure operator comfort during long shifts.

Power Turn with Differential Steering

With differential steering, large blade loads can be smoothly maneuvered while turning. The operator maintains precise control on slopes, around buildings, bridge abutments, trees or other obstacles.
• Differential Steering has the ability to work in tight areas by providing a “Best in Class” tight turning radius.
• Steering modulation is finely tuned for precise control in all turning applications.
• Regardless of ground conditions, steering is consistent because power is maintained to both tracks during operation.

Differential Steering System

A planetary differential turns the machine by speeding up one track and slowing the other while maintaining full power to both. The differential steering system consists of:
• Three planetary gear sets.
• A dedicated variable-displacement hydraulic pump.
• A bi-directional, fixed-displacement steering motor.
• Heavy-duty steering drive gears.
• Two planetary gear sets (steering and drive) make up the dual differential.
• A third planetary gear set, the equalizing planetary, resides in the main case and provides a maximum 4.0 km/h (2.49 mph) speed difference between tracks.

Operation

When moving straight ahead, power flows through the transmission pinion and bevel gear into the dual differential, transmitting equal, uninterrupted power to each final drive. While turning, power is shifted to the outboard track speeding it up. The inboard track slows down to accommodate a tighter turning radius. Forward ground speed remains the same throughout the turn.

Cab

The design is spacious and comfortable to promote shift-long productivity. Large glass window and door panels allow for excellent visibility to the blade, rear and sides of the machine. Door and window seal design allows for a fully pressurized low dust cab. Acoustic headliner material, and sound suppression foam panels reduce sound levels.Individual windshield wiper controls are located in the front section of the headliner. The cooling system is incorporated into the cab structure providing good visibility to the rear of the machine. The operator can easily access to the vital information regarding machine functioning by having a look on the efficient and clear dashboard.

Cat C500 Comfort Suspension Seat

Caterpillar C500 Comfort Series Air Suspended Seat is ergonomically designed to support the operator in various site conditions. This comfort equipment is now standard on the D6N.
• Seat is fully adjustable for maximum operator comfort, support and reduced operator fatigue.
• Seat cushion reduces pressure on the lower back and thighs while allowing unrestricted arm and leg movement.
• A standard lumbar adjustment provides lower back comfort.
• Heated seat cushions are available from your Caterpillar Dealer.

Dash

The instrument panel, with easy to read analog gauges and warning lamps, keeps the operator aware of any potential problems. All gauges and readouts are easily visible in direct sunlight. Warning lights and gauges have been relocated, providing precise and efficient view of the alerts. HVAC controls and vents are conveniently located on the dash to provide climate control for the operator. Auto-shift and Auto-kickdown controls are located within easy reach. Footpads keep the operator stable and comfortable while working on slopes.

Electronic Monitoring System (EMS III)

EMS III provides the operator instant feedback on machine conditions and records performance data to help diagnose problems. It has flashable memory allowing system upgrades, as new technology and software become available. This system is compatible with Cat ET and CMS service tools. EMS with new functionalities includes the following gauges and readouts:
• Fuel level gauge
• Hydraulic oil temperature gauge
• Engine coolant temperature gauge
• Power train oil temperature gauge
• Indicators for: - Oil Pressure - Water in Fuel Separator maintenance - Air Filter Plugging
• Engine oil pressure indicator
• Engine speed digital readout
• Transmission speed range indicator
• Hour meter
• Odometer

Throttle Rocker Switch

A rocker switch control activates high or low idle with a touch of the finger. A decelerator pedal gives the operator full control of engine speed when the rocker switch is in the high idle position. Specific engine speeds can also be set with the rocker switch to match application requirements.To set engine speeds, push the decel pedal, select the desired speed and recall it by activating the rocker switch for 3 seconds.

Work Tool Controls

Low effort pilot operated hydraulic controls make the D6N easy to operate and provide sure, precise blade control with less operator fatigue. Ergonomically shaped blade and ripper controls provide increased operator comfort during long shifts.

AccuGrade Attachment Ready Option

The AccuGrade Attachment Ready Option (AccuGrade ARO) provides a factory installed on-board platform for the AccuGrade Laser or GPS system.All of the changes required to the electrical system, hydraulic system, blade, and cab are incorporated into the AccuGrade ARO. Mounting brackets added on the blade allow easy installation of the masts. Mounting brackets in the cab secure the in-cab display. Plug-in points inside the cab and on the front of the machine make it easy to install electronic components.

Advantages

Current earthmoving and fine grading processes are labor intensive, dependent on manpower and instruments. Maintaining consistent grade between stakes is challenging, even for experienced operators. The AccuGrade Laser and GPS Machine Control and Guidance Systems reduce labor requirements and help operators work to the design plan by accurately cutting, filling and reducing material cost.

Automatic Blade Control Feature

Automatic control of the blade's lift and/or tilt, provides consistent accuracy with higher productivity by reducing blade control demands on the operator. Based on correction signals, a hydraulic control valve automatically raises or lowers the blade to maintain the correct edge elevation.

Applications

The AccuGrade Laser and the GPS systems are designed for a wide range of construction earthmoving applications requiring tight tolerances and high productivity rates. Choosing whether to use a Laser or GPS system depends on the job site requirements.

AccuGrade Laser Grade Control System

The laser system is ideal for fine grading sites with flat, single slope or dual slope surfaces such as industrial, commercial and residential building sites.

Laser In-Cab Display

The in-cab display with easy-to-read grade indicator and backlit elevation display shows the operator all AccuGrade system information. The in-cab display arrows show the blade's position relative to grade and indicate cut or fill requirements of the work area. Push button operation allows the operator to easily switch from manual mode for rough grading to automatic mode for fine grading.

AccuGrade GPS Control System

The AccuGrade Global Positioning System (GPS) is the best solution when the construction site involves contours, rather than single or dual slope planes. A GPS system compares the blade position to a three-dimensional computerized job site plan and signals the operator or hydraulic system to raise or lower the blade to achieve the design requirements.

GPS In-Cab Display

The in-cab display provides real-time operating information to the operator. Designed for simple operation, the 140 mm (5.5 in) color LCD daylight readable display with keypad allows operators to easily interface with the system. Settings and views can be easily configured according to operator preference. The display is designed for reliable performance in extreme operating conditions including shock, dust and moisture.

Weatherproof Design

All AccuGrade components are designed for dependable performance in harsh environments.

Support

Caterpillar AccuGrade Laser and GPS systems are available at your local Caterpillar Dealer.

Frame and Castings

The D6N case and frames are built to absorb high impact shock loads and torsional forces. Castings are strategically located within the frame to add additional strength. Caterpillar uses robotic welding techniques in the assembly of the case and frames. This ensures quality and reliability throughout the structure.
• High strength steel mainframe resists impact shock loads.
• Computer-aided finite element analysis is used to evaluate and ensure durability.
• Full scale structural testing to test integrity of the structures.
• Robotic welding provides deep penetration and consistency for long life.
• Precision top level machining for perfect alignment of bores and surfaces.
• Pivot shaft and pinned equalizer bar to maintain track roller frame alignment.

Equalizer Bar

The pinned equalizer bar gives the roller frames the ability to oscillate up or down to better match ground contours while providing maximum traction and operator comfort.

Roll Over Protection

N-Series cab supports have been stiffened. Stiffer cab supports result in lower noise and vibration in the cab, providing the operator increased comfort.

Quality and Reliability

• 4 mm (0.16 in) sheet metal on the side service access panels and rear guard.
• Stamped, rounded sheet metal corners add strength.
• Rubber isolation mounted fuel tank eliminates tank vibration and reduces potential stress fractures.
• Heavy-duty reinforced radiator guard is now standard.
• Heavy-duty rear guard for ripper.
• Clipped seals provide protection from dust and moisture for rear enclosure, door openings, and between ROPS post and rear enclosure.

Styling

Rounded machine shapes offer excellent visibility, accessibility and serviceability.
• Durable, heavy steel door panel covers.
• Pre-cleaner is below the hood for good visibility.
• Engine enclosure is tapered as it reaches the cab.
• Large glass area.
• Controls are ergonomic for easier operation and better efficiency.

SystemOne™ Undercarriage

Exclusively for Caterpillar machines the design extends system life and reduces operating costs.

Undercarriage Arrangements

XL (Extra Long) arrangement
• Forward idler position provides more track on the ground and to the front of the tractor. It provides optimal balance, superior traction and blade control for finish grading.
• Long roller frame provides good flotation in soft underfoot conditions.LGP (Low Ground Pressure) arrangement
• Specially designed to work in soft and spongy conditions.
• Wide track shoes, a longer track frame and a wider gauge increase track contact area and reduce ground pressure for excellent flotation.
• Wide track shoes, long track frames and a wider gauge increase track contact area and reduce ground pressure for excellent flotation.

Complete Guarding

Caterpillar undercarriages are designed with full length guarding on top of the track roller frame. This prevents abrasive materials from falling down on moving parts.

Roller Frames

Roller frames are tubular, to resist bending and twisting. • Roller frames attach to the tractor by a pivot shaft and pinned equalizer bar.

Recoil System

The recoil system is superior because it is protected from the elements and maintained in a sealed, oil-filled cavity for years of reliable service.

Oscillating Undercarriage

The pinned equalizer bar is saddle-mounted beneath the mainframe, allowing the roller frames and track to oscillate. The oscillation provides a steady working platform and smooth ride for the operator.

Caterpillar Blades

With superior moldboard and 4-cell structure design, Cat bulldozer blades hold up to the toughest job conditions. Our high-tensile strength blades resist torsional bending and deflection in tough applications.
• High-tensile strength, Cat DH-2™ steel, cutting edges resist bending.
• DH-3™ steel end bits maximize service life.

Variable Pitch Power Angle and Tilt Blade (VPAT)

The VPAT blade gives the operator the ability to hydraulically adjust the blade lift, angle and tilt from the operator's station.
• Manually adjustable blade pitch for optimum performance.
• Top corners of the blade are clipped for better operator viewing area. (XL arrangement only).
• C-Frame is solidly pinned to the mainframe for good blade control and eliminates blade motion due to track oscillation or side forces.
• C-Frame to tractor joint is sealed and lubricated with remote lines for extended service life and quiet operation.
• Large C-Frame tower bearings have been added to improve durability.
• Lubrication points are located at all pin joints to reduce wear.

Semi-Universal Blade (XL Arrangement Only)

Built for tough applications where penetration and blade side loading are important. The design of the SU blade makes it excellent for aggressive dirt penetration and loading materials. The blade wings are designed for superior load retention.

Foldable Blade

Designed to conform to the 3 m (9.8 ft) width transportation limit without blade removal. Allows a section on the left end of the blade to fold forward into transportation position.

Multi-Shank Ripper

The multi-shank parallelogram ripper lets you choose one, two or three shanks depending on job conditions.
• Curved or straight ripper shanks are available.
• Excellent chassis durability in severe drawbar applications.

Drawbar

The D6N can be equipped with a drawbar for pulling work tools such as:
• Disks
• Compactors
• Chopper wheels
• Retrieval of other equipment

Winch

• Single joystick electronically controls both clutch and brake functions to improve operator efficiency.
• Input clutches on PTO shaft reduce engine horsepower loss for fuel efficiency.
• Clutch engagement and brake release are automatically synchronized for smooth operation.
• Winch components can be serviced with winch mounted on tractor.
Check with your Caterpillar Dealer for details.

Forestry Sweeps

In forestry and land clearing applications where limbs and debris can damage a machine, optional sweeps are available for the D6N. Sweeps help to shield critical components on the tractor such as hydraulic lines, exhaust stacks, cab windows and lights from damage.

Custom Products

The Special Product Group can help you with answers to your specific requirements by building the machine you need: Waste, Forestry and Shiphold applications.

Built-in Serviceability

Less service time means more working time. Major components are designed as modules and most can be removed without disturbing or removing other components.

Diagnostic Connector

Diagnostic connector allows Caterpillar dealers to quickly troubleshoot the D6N or access stored data with the use of Electronic Technician (Cat ET).

Product Link

The optional Product Linksystem is a factory installed or easily retrofitted wireless system that simplifies equipment fleet tracking. Using satellite or cellular technology, the system automatically reports key machine parameters such as location, machine hours, active and logged service codes and security alarms. Depending on the Product Link version, it can connect with other on-board systems, issue e-mail or pager alerts and provide fuel consumption data.

Electronic Monitoring System

The D6N features a flexible monitoring system that is easily upgraded by flashing software rather than replacing the module, reducing parts cost. As technology changes and new electronics and software become available, the monitoring system will allow the machine to be easily updated.

Ecology Drains

Ecology drains provide an environmentally safer method to drain fluids. They are included on the radiator (coolant) and the hydraulic tank, and for the engine oil change.

Easy Engine Maintenance

Many parts can be rebuilt and are available as remanufactured components.
• Parent-metal block can be rebored twice and dry-sleeved.
• Connecting rods can be removed through cylinder tops.
• Camshaft followers and push rods can be replaced without removing camshaft.
• Extended oil and engine filter change intervals up to 500 hours.

Accessibility

• Hinged engine doors to increase engine and service access.
• Filters located within easy reach during PM service.
• Air filter conditions are monitored electronically.
• Fast fuel tank provision available (attachment).
• Larger service panel doors.
• Diagnostic test ports added for quick troubleshooting.

Product Support

Nearly all D6N parts can be found at Cat dealer parts counters. Cat dealers utilize a worldwide computer network to find in-stock parts to minimize machine downtime. An exchange program for major components may be available. This will shorten repair time and lower costs.

Remanufactured Components

Save money with remanufactured parts. You receive the same warranty and reliability as new products at a cost savings of 40 to 70 percent.

Service Capability

Whether in the dealer's fully equipped shop or in the field, you will get trained service technicians using the latest technology and tools.

Selection

Make detailed comparisons of the machines you are considering before you buy. How long do components last? What is the cost of preventive maintenance? What is the true cost of lost production? Your Cat Dealer can give you answers to these questions.

Purchase

Consider the financing options available as well as day-to-day operating costs. This is also the time to look at dealer services that can be included in the cost of the machine to yield lower equipment owning and operating costs over the long run.

Operation

Improving operating techniques can boost your profits. Your Cat Dealer has training videotapes, literature and other ideas to help you increase productivity.

Replacement

Repair, rebuild or replace? Your Cat Dealer can help evaluate the cost involved so you can make the right choice.

Maintenance

More and more equipment buyers are planning for effective maintenance before buying equipment. Choose from your dealer's wide range of maintenance services at the time of your purchase. Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as Scheduled Oil Sampling and Technical Analysis help avoid unscheduled repairs.