Rear view monitor system
 
On the large LCD color monitor, the operator can view, through one camera, areas directly behind the machine. This camera can be synchronized with reverse operation.
 
Secondary engine shutdown switch
 
A new secondary switch has been added at the side of the front console to shut down the engine.
 

Planned maintenance and daily checks are the only way to ensure long service life from equipment. That’s why Komatsu designed the D39PX-24 with conveniently located maintenance points to make necessary inspections and maintenance quick and easy.
 

Ecology guidance
 
In order to support efficient operation, the following four messages are displayed for fuel saving operation. These can be displayed by the operator, if desired.
 
1. Avoid Excessive Engine Idling
2. Use Economy Mode to Save Fuel
3. Avoid Hydraulic Relief Pressure
4. Avoid Over Load
 
Ecology gauge
 
To help the operator to perform in an environmentally friendly way and minimize energy consumption, an easy-to-read “Ecology gauge” is displayed on the left of the multi-monitor screen.
 
Fuel consumption display
 
Average fuel consumption during the day is displayed and updated every 10 seconds.
 

The D39PX-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.
 

New regulations effective in 2014 require the reduction of NOx emissions. In addition to refining the U.S. EPA Tier 4 Interim technologies, Komatsu developed a new Selective Catalytic Reduction (SCR) device in-house.
 
1. Komatsu Diesel Oxidation Catalyst (KDOC)
2. Variable flow turbocharger
3. Komastu Closed Crankcase Ventilation (KCCV)
4. SCR with Diesel Exhaust Fluid (DEF)
 

A large, user-friendly color monitor provides easy-tounderstand information for the operator. Excellent screen visibility is achieved with a high resolution LCD monitor that is easy to read at various angles and lighting conditions. Simple and easy-to-operate switches and function keys facilitate multi-function operations. The monitor displays data in 26 languages.
 

One of the design goals behind the creation of the D39PX-24 was to manufacture a more durable machine. This was achieved by reducing component complexity and using a strong modular design for increased serviceability and durability. Steel castings reduce the number of welds, improving rigidity and strength.
 

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.

Komatsu’s ergonomically designed PCCS handles create an operating environment with complete operator control.
 
PCCS
 
The low-effort PCCS joystick controls all directional movements, including machine travel speed as well as counter-rotation.
 
Electronic controlled hydraulic system
 
Electronic controlled palm commanded joystick provides precise blade control. New blade angling switch operation provides easier and predictable blade control.
 

Komatsu's PLUS rotating bush design provides less downtime, longer wear, and with up to 40% lower undercarriage maintenance costs. Rotating bushings eliminate the cost and downtime for bushing turns, and strengthened rollers and links increase wear life up to two times. With PLUS, individual links can be replaced with common track tools.
 

A power angle power tilt dozer blade with adjustable blade pitch system is available on the D39PX-24. The hydraulic blade tilt and angling function expands versatility and productivity in a variety of applications and manually adjustable blade pitch.
 

The D39PX-24 utilizes a swing-up fan with a gas strut-assisted lift system to provide easy access to the (side-by-side) radiator, oil cooler and charge air cooler. The hydraulic fan has a cleaning mode which enables the fan to rotate in the reverse direction to help clear off objects that are restricting air flow.
 

P mode is the mode designed for powerful operation and maximum production. E mode is designed for general dozing applications, providing adequate speed and power, while saving energy. For fuel reduction and energy savings, the monitor panel allows the operator to easily switch between working modes, depending on working conditions.
 
P mode (Power mode)
 
With P mode, the engine outputs its full power, allowing the machine to perform work requiring large production, heavy-load, and uphill work.
 
E mode (Economy mode)
 
With E mode, the engine outputs enough power for the work without delivering unnecessary power. This mode enables energy saving operation and is ideal on hard or rough surfaces that often cause shoe slip and work not requiring as much power, such as downhill dozing, leveling and light-load work.
 

The D39PX-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 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.