D39EXi-24 Komatsu D39EXi-24 Specifications & Technical Data (2020—2026)

Unrivaled Blade Visibility

The D39EXi/PXi-24 incorporates Komatsu's super-slant nose design. Komatsu's innovative design provides excellent blade visibility for improved machine control and increased efficiency and productivity.

KOMATSU CARE® Program Includes

The D39EXi/PXi-24 comes standard with complimentary factory scheduled maintenance for the first 3 years or 2,000 Hours, whichever comes first.

Benefits of Using Komatsu CARE

Assurance of Proper Maintenance with OEM Parts & ServiceIncreased Uptime & EfficiencyFactory Certified Technicians Performing WorkCost of Ownership SavingsTransferable Upon Resale

Komatsu Oil and Wear Analysis (KOWA)

KOWA detects fuel dilution, coolant leaks, and measures wear metalsProactively maintain your equipmentMaximize availability and performanceCan identify potential problems before they lead to major repairsReduce life cycle cost by extending component life

Technologies Applied to New Engine

Water cooled variable flow turbocharger a newly designed variable flow turbocharger features simple and reliable technology that varies the intake airflow. Exhaust turbine wheel speed is controlled by a flow control valve that enables delivery of an optimal volume of air to the engine combustion chamber under all speed and load conditions. The result is cleaner exhaust gas while maintaining power and performance.

Heavy-duty High Pressure Common Rail (HPCR) fuel injection system

The system is designed to achieve an optimal injection of high-pressure fuel by means of computerized control, thereby bringing close to complete combustion to reduce Particulate Matter (PM) emissions. While this technology is already used in current engines, the new system uses higher-pressure fuel injection, thereby reducing both PM emissions and fuel consumption over the entire engine power range.

Redesigned combustion chamber at top of piston

The combustion chamber at the top of the piston has a new shape designed to improve combustion and further reduce NOx, PM, fuel consumption and noise.

Auto Idle Shutdown Function

Komatsu auto idle shutdown automatically shuts the engine down after idling for a set period of time to reduce unnecessary fuel consumption and exhaust emissions. The amount of time before the engine is shutdown can be easily programmed from 5 to 60 minutes.

Hydraulically Driven Cooling Fan

The engine cooling fan's speed is electronically controlled. Fan speed depends on engine coolant and oil temperatures. The fan will only rotate as fast as is necessary to adequately cool the machine's fluid. This system increases fuel efficiency, reduces operating noise levels and requires less horsepower than a belt-driven fan.

Komatsu Closed Crankcase Ventilation (KCCV)

Crankcase emissions (Blowby gas) are passed through a KCCV filter. The KCCV filter traps oil mist which is returned back to the crankcase while the gas, which is almost oil mist free, is fed back to the air intake.

Hydraulic System

Closed-Center Load Sensing System (CLSS) designed for precise and responsive control, and for efficient simultaneous operation. Hydraulic control unit: All spool control valves externally mounted remote to the hydraulic tank. Piston-type hydraulic pump with capacity (discharge flow) of 90 ltr/min 26.2 U.S. gal/min at rated engine rpm. Relief valve setting 27.4 MPa 280 kg/cm² 3,974 psi. Hydraulic cylinders Double-acting, piston type.

Advanced electronic control system

The electronic control system performs high-speed processing of all signals from sensors installed in the vehicle and engine. This ensures total control of the equipment under all conditions. Engine condition information is displayed via an on-board network on the monitor inside the cab. Furthermore, KOMTRAX helps customers use this information to keep up with maintenance needs.

HST Control System

The HST controller monitors engine output and work load. It controls HST pump and motor displacement to provide the optimum speed and drawbar pull. Full power to both tracks during turns or counter-rotation makes the D39EXi/PXi-24 extremely maneuverable.

HST with Electronic Control

The D39EXi/PXi-24 is equipped with Komatsu-designed HST that allows for Quick-Shift or variable speed selection. The HST consists of dual-path closed-circuits, with two variable displacement piston pumps and two variable displacement travel motors. Hydrostatic steering eliminates steering clutches and brakes, providing smooth, powerful turns. Fully electronic control provides complete automatic shifting and enables smooth control. Engine speed is controlled using an electronic fuel control dial.

One-Pedal Design (Decelerator/Brake Pedal) Controls Speed, During Operation

Machine operation is simple because brake function has been integrated into the decelerator pedal. Machine travel speed can be controlled using one pedal. The pedal function can be changed by a mode selector switch. Decelerator mode: The pedal modulates engine rpms and vehicle travel speed. It can be used for all applications. Brake mode: The pedal modulates vehicle travel speed while maintaining high-engine speed. This mode can be helpful to maintain work-equipment speed, while using the brake function.

Innovative. Integrated. Intelligent.

Standard Intelligent Machine Control Standard factory installed integrated 3D GNSS (Global Navigation Satellite System) intelligent machine control system. Improved Machine Control Up to 8% more efficient dozer operation than comparable aftermarket machine control systems in start to finish grading tests.

Automatic Blade Control

The D39EXi/PXi-24 features a 3D Global Navigation Satellite System (GNSS*) machine control system which automatically controls the blade elevation and tilt per target design data. Not only can the automatic machine control features be used for finish grading but also for heavy (rough) dozing. Loading of the blade at the start of the cut is controlled per set parameters. During the pass, if the load on the blade increases during heavy dozing operation, the blade is automatically raised to control the load and minimize shoe slip to ensure efficient dozing. When the blade approaches the target design surface, the blade will follow it for accurate finish grading.

As-built Mapping Display for Checking Construction Progress

Cab top GNSS antenna provides for accurate as-built surface data collection by measuring actual elevations as machine continuously tracks in operation.

PAT Dozer with Adjustable Pitch

A power angle power tilt dozer blade with adjustable blade pitch system is available on the D39EXi/PXi-24. The hydraulic blade tilt and angling function expands versatility and productivity in a variety of applications and manually adjustable blade pitch.

Electronic Controlled Hydraulic System

Electronic controlled palm commanded joystick provides precise blade control. New blade angling switch operation provides easier and predictable blade control.

Dozer Equipment

Blade capacities are based on the SAE recommended practice J1265. Use of high-tensile-strength steel in moldboard for strengthened blade construction.