• 21,848 lbs Operating Weight
  • 105 hp @ 2200 rpm Horsepower
  • 2.9 - 3.14 yd¬≥ Blade Capacity


Introducing the Next Generation of Machine Control

Intelligent Machine Control machines have the following advantages over dozers with external grade control systems.

  • Innovative
    Automated operation from rough dozing to finish grade.
  • Intelligent
    New dozing mode, load control performance features.
  • Integrated
    Standard factory installed integrated system.
  • No Cables
    No coiled cables between machine and blade.
  • No Climbing
    GNSS antenna and mast removed from blade.
  • No Connections
    No daily connections required between machine and blade.


Automated Blade Control, from Rough Dozing to Finish Grade. Straight to Grade.

  1. Blade moves to target surface until load reaches a preset level.
  2. The blade automatically raises to minimize track slip.
  3. Should the load decrease, blade will lower to re-load blade to an optimum level.


Brake Mode

The pedal can decelerate vehicle travel speed, keeping high engine revolution. This mode can be helpful to keep work equipment controllability and/or force, even during braking.

Cab Top GNSS Antenna

No blade mounted GNSS antenna(s), cables to worry about damaging with cab top GNSS antenna. Reduced risk of theft due to low visibility as viewed from ground level.

Decelerator Mode

The pedal can decelerate engine RPMS and vehicle travel speed. Normally can be used for all applications.

Fuel consumption decreased by up to 10% P mode

(Compared with the D39-22)

Fuel consumption decreased by up to 20% E mode

(Compared with the D39-22)

Hydraulically-Driven Swing-up Fan

The D39i-23 utilizes a swing-up fan with a gas strut-assisted lift locking system to provide easy access to
the (side-by-side) radiator, oil cooler, and charge air cooler. The swing-up feature makes it easier to access cooling cores. The hydraulic fan can rotate in the reverse direction to help remove debris from cooler cores.

Modular Design

One of the design goals behind the creation of the D39i-23 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 C-frame rigidity and strength.

New HST Technology

The D39i-23 incorporates new proprietary engine and hydrostatic transmission pump control technology to improve operational efficiency and reduce fuel consumption to levels lower than a conventional HST control system can obtain. This Komatsu exclusive feature reduces fuel consumption by up to 10% in P mode in demanding working conditions and up to 20% in E mode under lighter load conditions as compared to the prior model.

Powerful turns under various work conditions are achieved with the new HST transmission, even under load. Counter-rotation is available for minimum turning radius, providing excellent maneuverability in tight spots.

Parallel Link Undercarriage System (PLUS)

Komatsu's new Parallel Link Undercarriage System (PLUS) provides less downtime plus longer wear life 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.

Power Angle Tilt PAT Dozer with Adjustable Pitch

A Power Angle Tilt dozer blade with highly durable boxstructure frame is available for the EX and PX machines. The hydraulic blade tilt and angling functions and manually adjustable blade pitch expand versatility and productivity in a variety of applications. This PAT dozer assembly is tested to stringent test standards.

Selectable Working Mode

Working mode E is for general dozing applications with adequate speed and power while reducing fuel consumption and CO2. Working mode P is aimed at powerful operation and maximum production. The
working mode is easily switched on the monitor panel, depending on the work at hand.

  • E mode (Economy mode)
    With E mode, the engine outputs enough power for most general dozing applications without delivering unnecessary power. This mode allows for energysaving operation and is suitable for work on ground where the machine may experience shoe slip or applications not requiring large power such as downhill dozing, leveling and light-load work.
  • P mode (Power mode)
    With P mode, the engine outputs its full power, allowing the machine to perform large production, heavy-load, or uphill work.

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

Machine operation becomes simple because brake function has been integrated into decelerator pedal. Machine moving speed including/excluding engine speed can be controllable by using only one pedal of decelerator/brake pedal. Operation of pedal function can be changed by the mode selector switch.

Stroke Sensing Hydraulic Cylinders

Robust stroke sensing hydraulic cylinders employ proven Komatsu sensor technologies for accurate finish grade performance. Stroke sensing angle cylinder allows machine control system to know the angle of the blade.

Variable and New Customizable Quickshift Modes

The D39i-23 offers two gearshift modes: Variable and the new Customizable Quick shift. Variable shift mode provides 20 incremental speed settings for the operator, while the new Customizable Quick shift provides 3 speed settings; all can be adjusted in the monitor to obtain the right speed for different operator preferences.



Model    Komatsu SAA4D95LE-6* 
Type    4-cycle, water-cooled, direct injection 
Aspiration    Variable flow turbocharged, air-to-air aftercooled 
Number of cylinders   
Bore x stroke  3.75" x 4.52"  95 mm x 115 mm 
Piston displacement  199 in³  3.26 ltr 
Governor    All-speed, electronic 
SAE J1995 - Gross  107 HP  79 kW 
ISO 9249 / SAE J1349 - Net  105 HP  78 kW 
Rated rpm    2200 rpm 
Fan drive type    Hydraulic 
Lubrication system:     
Method    Gear pump, force lubrication 
Filter    Full-flow 

*EPA Tier 4 Interim and EU stage 3B 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 damaged by debris. Bolt-on sprocket ring.

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 U.S. gal/min at rated engine rpm.     
Relief valve setting  3,974 psi  27.4 MPa / 280 kg/cm² 
Hydraulic cylinders    Double-acting, piston type 
Number of cylinders:
Bore  Bore 
Blade lift / 2  3"  75 mm 
Blade tilt / 1  3.5"  90 mm 
Blade angle / 2  3.1"  80 mm 
Hydraulic oil capacity (refill):     
Power angle tilt dozer  15.9 U.S. gal  60 ltr 
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 
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  18,387 lb  8340 kg
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  20,922 lb  9490 kg 

Service Refill Capacities

Coolant  9.0 U.S. gal  34 ltr 
Fuel tank  50.2 U.S. gal  190 ltr 
Engine oil  2.9 U.S. gal  11 ltr 
Hydraulic tank  15.8 U.S. gal  60 ltr 
Final drive (each side)  0.9 U.S. gal  3.5 ltr 

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 rearward 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:  87"  2.2 m 
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  2.1"  53 mm 
Shoe width (standard)  20"  510 mm 
Ground contact area  3,731 in  24072 cm² 
Ground pressure
(with dozer, ROPS cab) 
5.64 psi  0.40 kgf/cm² / 38.9 kPa 
Track gauge  5'4"  1620 mm 
Length of track on ground  7'9"  2360 mm


  • Air cleaner, double element with caution lamp on monitor 
  • Alternator, 60 ampere/24V 
  • Backup alarm 
  • Batteries, 92 Ah/2 x 12V 
  • Battery disconnect switch 
  • Blade lift cylinders 
  • Color monitor, LCD
  • Decelerator pedal (single pedal) 
  • Engine hood 
  • Engine intake centrifugal precleaner 
  • Engine, swing open side cover 
  • Engine shutdown secondary switch 
  • Front pull hook
  • Fuel prefilter (10 micron) and fuel filter (2 micron) 
  • Grease gun holder
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with reverse clean mode 
  • Intelligent Machine Control 
  • KOMTRAX® Level 4 
  • Komatsu Diesel Oxidation Catalyst (KDOC) 
  • Locks, filler caps and covers 
  • Muffler with curved exhaust pipe 
  • Radiator mask, heavy-duty, swing up 
  • Radiator reserve tank 
  • ROPS cab** 
  • Air conditioner 
  • Cab accessories
    --12V power supply (2 ports)

    --Cup holder

    --Rearview mirror

    --Rear view monitoring (1 camera)

    --AM/FM Radio w/remote AUX plug (3.5 mm)

    --72 dBA 
  • Work lights
    --3 front, cab mounted

    --2 rear, cab mounted
  • Seat, air suspension, fabric, heated low back, headrest
  • Seat belt, 76 mm 3", retractable
  • Sealed electrical connectors
  • Side by side rear mounted cooling package
  • Starting motor, 4.5 kW/24V
  • Steering system, hydrostatic 
  • Track roller guards, center and end sections
  • Track shoe assembly (PLUS)
  • Sealed and lubricated 
  • 510 mm / 20" single grouser shoe (EX) 
  • 635 mm / 25" single grouser shoe (PX) 
  • Transmission with Variable and Customizable Quickshift 
  • Transmission, hydrostatic 
  • Underguards, heavy duty 
  • Engine 
  • Transmission 
  • Variable flow turbocharger 
  • Water separator 

* Dozer assembly and rear mounted equipment are not included in base machine standard equipment
** Cab meets ROPS and FOPS Level 2 standards


  • 700 mm / 27.5" grouser with AR link 
  • Dozer assembly 
  • Hitch 
  • Hydraulics for rear equipment 
  • Track roller guard, full length