• 22,817 lbs Operating Weight
  • 105 @2200 rpm Horsepower
  • 3.14 yd³ Blade Capacity


If you want to perform heavy dozing or accurate fine dozing while sitting in a quiet comfortable cab with unrivaled blade visibility, then you need the D39-24 Crawler Dozer. Equipped with an EPA Tier 4 Final certified engine, this dozer has the cab forward design improved blade response, faster work equipment speed, and an additional “fast-blade mode” that improves blade speed for high-speed grading. The D39-24 is extremely maneuverable by providing full power to both tracks during turns or counter rotation steering. It is an ideal choice for any grading or earth moving applications.

D39PX-24 Walkaround  >


Additional Operator Convenience Equipment

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.

Easy Maintenance

Planned maintenance and daily checks are the only way to ensure long service life from equipment. That’s why Komatsu designed the D39EX/PX-24 with conveniently located maintenance points to make necessary inspections and maintenance quick and easy.

Energy Saving Operation

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.

HST with Electronic Control

The D39EX/PX-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.

Komatsu’s New Emission Regulations-compliant Engine

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)

Large Multi-Lingual High Resolution LCD Monitor

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.

Modular design

One of the design goals behind the creation of the D39EX/PX-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.

Single Pedal (Decelerator/Brake Pedal) to be operated for Speed Control, 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.

Palm Command Control System (PCCS) Levers

Komatsu’s ergonomically designed PCCS handles create an operating environment with complete operator control.


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.

Parallel Link Undercarriage System (PLUS)

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.

PAT Dozer with Adjustable Pitch

A power angle power tilt dozer blade with adjustable blade pitch system is available on the D39EX/PX-24. The hydraulic blade tilt and angling function expands versatility and productivity in a variety of applications and manually adjustable blade pitch.

Rear, hydraulically-driven, swing-up fan

The D39EX/PX-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.

Robust Guarding And Attachments

Komatsu offers a full guarding package to help protect your machine and operator in severe applications.

Selectable Working Mode

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.

Unrivaled Blade Visibility

The D39EX/PX-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.

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.



Komatsu SAA4D95LE-7*
4-cycle, water-cooled, direct injection
Variable flow turbocharged, air-to-air aftercooled
Number of cylinders
Bore x stroke 95 mm x 115 mm 3.75" x 4.52"
Piston displacement 3.26 ltr 199 in³
All-speed, electronic

SAE J1995 - Gross 79 kW 107 HP
ISO 9249 / SAE J1349 - Net 78 kW 105 HP
Rated rpm
2200 rpm
Fan drive type
Lubrication system:

Gear pump, force lubrication
*EPA Tier 4 Final emissions certified

Final Drive

In-shoe mounted, axial-piston-type travel motors, with integrated two-stage planetary gear reduction. Compact, in-shoe mount reduces risk of damage by debris. Bolt-on sprocket ring with triple labyrinth seal design.

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 99 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
Number of cylinders: Bore Bore
Blade lift / 2 75 mm 3"
Blade tilt / 1 90 mm 3.5"
Blade angle / 2 80 mm 3.2"
Hydraulic oil capacity (refill):

Power angle tilt dozer 64 ltr 17 U.S. gal
Control valves:
3-spool control valve for Power Angle Tilt dozer


Blade lift
Raise, hold, lower, and float
Blade tilt
Right, hold, and left
Blade angle
Right, hold, and left
Additional control valve required for ripper


Ripper lift
Raise, hold and lower

Hydrostatic Transmission

Dual-path, hydrostatic transmission provides infinite speed changes up to 8.5 km/h 5.3 mph. The variable capacity travel motors allow the operator to select the optimum speed to match specific jobs. Travel control lock lever and neutral switch.

Travel speed
(quick shift mode)*
Forward Reverse
1st 0–2.1 mph
0–3.4 km/h
0–2.5 mph
0–4.1 km/h
2nd 0–3.5 mph
0–5.6 km/h
0–4.0 mph
0–6.5 km/h
3rd 0–5.3 mph
0–8.5 km/h
0–5.3 mph
0–8.5 km/h
Travel speed
(variable mode)
Forward Reverse
0–5.3 mph
0–8.5 km/h
0–5.3 mph
0–8.5 km/h
*Quick shift speeds are adjustable in the monitor.

Operating Weight (APROXIMATE)

Tractor weight:
Including ROPS cab, U frame for power angle tilt dozer, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.

ROPS cab 8790 kg 19,379 lb

Operating weight:
Including Power Angle Tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, hydraulic control unit, coolant, and full fuel tank.

ROPS cab 9930 kg 21,819 lb

Service Refill Capacities

Coolant 34 ltr 9.0 U.S. gal
Fuel tank 190 ltr 50.2 U.S. gal
Engine oil 11 ltr 2.9 U.S. gal
Hydraulic tank 64 ltr 17 U.S. gal
Final drive (each side) 3.5 ltr 0.9 U.S. gal
Diesel Exhaust Fluid (DEF) tank 10 ltr 2.6 U.S. gal

Steering System

Palm Command Control System (PCCS) joystick control for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it back reverses the machine. Simply tilt the joystick to the left or right to make a turn. Tilting the joystick fully to the left or right activates counter-rotation.

Hydrostatic Transmission (HST) provides smooth, powerful turns. Fully electronic control enables smooth control that can be adjusted in the monitor. The PCCS utilizes shift buttons to increase and decrease speed.

Minimum turning radius: 2.2 m 87"

*As measured by track marks on the ground at pivot turn.


Suspension Rigid type
Track roller frame Monocoque, large section, durable construction
Rollers and idlers Lubricated track rollers
Sealed and lubricated track Track tension is easily adjusted with grease gun.
Number of track rollers (each side) 6
Type of shoes (standard) Single grouser
Number of shoes (each side) 39
Grouser height 47 mm 1.9"
Shoe width (standard) 510 20"
Ground contact area 23919 cm² 3,708 in²
Ground pressure
(with dozer, ROPS cab)
0.46 kgf/cm² / 45.1 kPa 5.88 psi
Track gauge 1620 mm 5'4"
Length of track on ground 2345 mm 7'8"


  • Accumulator for Electric Proportional Control (EPC)
  • Air cleaner, dry, double element type with caution lamp on monitor
  • Air conditioner (A/C)
  • Air inlet
  • Alternator, 24 V/85 A
  • Auto idle shutdown
  • Back-up alarm
  • Batteries, large capacity 24 V/92 Ah
  • Battery disconnect switch
  • Cab accessories
    --12 V × 2 power supply

    --Cup holder

    --Rear view mirror

    --Rear view monitor system
  • Crankcase guard and underguard
  • Decelerator/brake pedal (Single pedal)
  • Electronically controlled Hydrostatic Transmission (HST) with quick-shift and variable speed settings
  • Electronic high resolution LCD color monitor panel with on-board diagnostics
  • Engine hood and side panels
  • Engine, KOMATSU SAA4D95LE-7, NET output of 78 kW 105 HP, direct injection, water-cooled turbocharged, air-to-air aftercooler, cooled EGR, EPA Tier 4 Final and EU Stage 4 emissions certified
  • Engine shutdown secondary switch
  • Fan, hydraulic driven, electronic control
  • Filler cap locks and cover locks
  • Foot rest, high mounted
  • Fuel pre-filter (10 micron) and fuel filter (2 micron)
  • Grease gun holder
  • High altitude arrangement (No fuel adjustment up to 2300 m)
  • Horn
  • Hydraulics for PAT dozer
  • Intake pipe with precleaner
  • Komatsu Diesel Oxidation Catalyst (KDOC)
  • Komtrax® Level 5
  • Lunch box holder
  • Marks and plates, English
  • New Operator Identification System 
  • Palm Command Control System (PCCS) with electronic control for travel control
  • Palm Command Control System (PCCS) with EPC for blade control
  • Power turn with counter rotation
  • Pullhook, front
  • Radiator guard grid
  • Radiator reserve tank
  • Real-time DEF monitoring
  • Rear-hinged radiator guard
  • Reverse travel speed presets
  • ROPS cab
  • Seat belt, 76 mm 3" retractable
  • Seat, air suspension, fabric, heated, low back, headrest
  • Sealed electical connections
  • Shovel holder
  • Starting motor, 24 V/4.5 kW
  • Selective Catalytic Reduction (SCR)
  • Self adjusting idler
  • Sprockets, bolt-on
  • Sprocket inner guard
  • Steering System, hydrostatic
  • Track roller guards, end section
  • Track shoe assembly (PLUS)
  • Sealed and lubricated
  • D39PX-24: 635 mm 25" single grouser shoe
  • Triple labyrinth final drive
  • Underguards, heavy duty
  • Engine
  • Transmission
  • Water separator
  • Wide core cooling package
  • Worklamp (Front 3, rear 2)

* Dozer assembly and rear-mounted equipment are not included in base machine price.

** Cab meets OSHA/MSHA ROPS and FOPS Level 2 standards (ROPS standards ISO 3471, SAE J/ISO 3471; FOPS standards ISO 3449


  • Dozer assembly
  • Hitch
  • Hydraulics for rear equipment
  • Track roller guard, full length
  • 700 mm 27.5" single grouser (PLUS)
  • 635 mm 25" single grouser (PLUS)