• 39,099 lbs Operating Weight
  • 168 @2200 rpm Horsepower
  • 4.5 yd³ Blade Capacity


Hydrostatic drive gives the D61EX-23 operator incredible control with tremendous pushing power. The super slant nose design gives the operator the balance he needs for high precision grading. Komatsu’s Tier 4 interim solution lets the operator work during regeneration. To make the operator more comfortable and productive, a new air suspension heavy duty heated seat is standard.

D61EX-23 Walkaround  >


Advanced Electronic Control System

The engine control system has been upgraded to effectively manage a variety of parameters such as the air flow rate, EGR gas flow rate, fuel injection parameters, and aftertreatment functions. The new control system also provides enhanced diagnostic capabilities.

ECO Guidance

In order to support to optimum operation, the following 4 recommendations are displayed to improve fuel saving operation:

    1) Avoid Excessive Engine Idling

    2) Use Economy Mode to Save Fuel

    3) Avoid Hydraulic Relief Pressure

    4) Avoid Overload

The operator can access the ECO guidance menu to check the Operation Records, Eco Guidance Records, and Average Fuel Consumption logs.

Electronic Controlled Hydraulic System EPC Blade Control Joystick

Blade control joystick uses the EPC valve and joystick, similar to the travel control joystick. EPC control combined with the highly reliable Komatsu hydraulic system enables superb fine control. A switch is now used to angle the PAT blade. A button to activate float is also provided.

Environment-Friendly Engine

The Komatsu SAA6D107E-2 engine is EPA Tier 4 Interim and EU Stage 3B emissions certified and provides exceptional performance while reducing fuel consumption. Based on Komatsu proprietary technologies developed over many years, this new diesel engine reduces exhaust gas particulate matter (PM) by more than 90% and nitrogen oxide (NOx) by more than 45%, compared to Tier 3 levels. Through the in-house development and production of engines, electronics, and hydraulic components, Komatsu has achieved great advancements in technology providing high levels of performance and efficiency in virtually all applications.

KDPF Regeneration Notification

The LCD color monitor panel provides the operator with the status of the KDPF regeneration without interfering with daily operation. When the machine initiates active regeneration, an icon will notify the operator.

Modular Design

One of the design goals behind the creation of the D61 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 Air Suspension Seat

A new higher capacity lowback heated seat with headrest is now standard. The new seat has many adjustments to accomodate different operators comfortably.

New HST Technology

The D61-23 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.

Palm Command Control System (PCCS) Travel Joystick 

Palm command travel joystick provides the operator with a relaxed posture and superb fine control. Transmission shifting is simplified with thumb push buttons.

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.

Rear View Monitoring 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.

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 energy saving 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.

Unrivaled Blade Visibility

The D61EX/PX-23 incorporates Komatsu’s super-slant nose design. Komatsu’s innovative design provides excellent blade visibility for improved machine control and increased efficiency and productivity.

Variable and New Customizable Quickshift Modes

The D61-23 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 SAA6D107E-2*
Type 4-cycle, water-cooled, direct injection
Aspiration Komatsu variable geometry Turbocharged, air-to-air aftercooled
Number of cylinders 6
Bore x stroke 4.21" x 4.88" 107 mm x 124 mm
Piston displacement 408 in³ 6.69 ltr
Governor All-speed and mid-range, electronic
SAE J1995 - Gross 170 HP 127 kW
(ISO 14396 169 HP 126 kW
ISO 9249 / SAE J1349 - Net 168 HP 125 kW
Rated rpm 2200 rpm
Fan drive type Hydraulic
Lubrication system:
Method Gear pump, force lubricationn
Filter Full-flow

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 teeth for easy displacement.

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 171 ltr/min / 45 U.S. gal/min at rated engine rpm.

Relief valve setting 3,974 psi 280 kg/cm²
Hydraulic cylinders 3,974
Hydraulic cylinders: Number of cylinders Bore
Blade lift 2 4"
100 mm
Blade tilt 1 5"
120 mm
Blade angle 2 4"
100 mm
Hydraulic oil capacity (refilling):
Power angle tilt dozer 26.7 U.S. gal 101 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 9.0 km/h 5.6 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)*ForwardReverse
1st0-3.4 km/h 0-2.1 mph0-4.1 km/h 0-2.5 mph
2nd0-5.6 km/h 0-3.5 mph0-6.5 km/h 0-4.0 mph
3rd0-9.0 km/h 0-5.6 mph0-9.0 km/h 0-5.6 mph
Travel speed (variable mode)0-9.0 km/h 0-5.6 mph0-9.0 km/h 0-5.6 mph
*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.
D61EX-23 36,999 lb 16780 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.
D61EX-23 39,099 lb 17735 kg

Service Refill Capacities

Coolant11.9 U.S. gal45 ltr
Fuel tank98.3 U.S. gal372 ltr
Engine oil7.2 U.S. gal27 ltr
Hydraulic tank26.7 U.S. gal101 ltr
Final drive (each side)2.2 U.S. gal8.1 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 (as measured by track marks on the ground at pivot turn.)83"2.1 m


SuspensionOscillating-type with equalizer bar and pivot shafts
Track roller frameMonocoque, large section, durable construction
Rollers and idlersLubricated track rollers
Lubricated tracksParallel Link Undercarriage System (PLUS) with lubricated rotating bushings for extended system wear life and lower maintenance costs.Track tension is easily adjusted with grease gun.
Number of track rollers (each side)8
Type of shoes (standard)Single grouser
Number of shoes (each side)46
Grouser height2.3"57.5 mm
Shoe width (standard)24"600 mm
Ground contact area4,836 in²31200 cm²
Ground pressure
(with dozer, ROPS canopy):
8.08 psi55.7 kPa
0.57 kgf/cm²
Track gauge6'3"1900 mm
Length of track on ground10'5"3161 mm


  • Air cleaner, double element with dust indicator
  • Alternator, 90 ampere/24V
  • Backup alarm
  • Batteries, 200 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
  • Enhanced provision for Topcon
  • Front pull hook
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with reverse clean mode
  • Hydraulics for rear equipment
  • KOMTRAX® Level 4
  • Komatsu Diesel Particulate Filter (KDPF)
  • Komatsu Variable Geometry Turbocharger (KVGT)
  • 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)
    76 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
  • Seat belt indicator
  • Sealed electrical connectors
  • Side by side rear mounted cooling package
  • Starting motor, 5.5 kW/24V
  • Steering system, hydrostatic
  • Track roller guards, center and end sections
  • Track shoe assembly
  • Heavy-Duty lubricated rotary bushing (PLUS) track
  • 600 mm / 24'' single grouser shoe (EX)
  • 860 mm / 34'' single grouser shoe (PX)
  • Transmission with Variable and Customizable Quickshift
  • Transmission, hydrostatic
  • Underguards, heavy duty
  • Engine
  • Transmission
  • Water separator

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


  • Dozer assembly
  • Drawbar, long type
  • Topcon® Plug-N-Play bolt-on finishing kit
  • Track roller guard, full length

Multi-shank ripper (for D61EX/PX):

  • Weight
    1757 kg / 3,874 lb
  • Beam length
    2170 mm / 7'1'';
  • Maximum lift above ground
    560 mm / 1'10'
  • Maximum digging depth
    665 mm / 2'2''