• 43,167 lbs Operating Weight
  • 168 @2200 rpm Horsepower
  • 4.98 yd¬≥ Blade Capacity


If your goal is to achieve maximum productivity at your job site, you need to carefully plan your work, and then work your plan. With intelligent Machine Control dozers, you can work your plan with utmost efficiency and accuracy. Through automatic dozing, rough cut to finish grade, iMC-equipped machines help you make every pass count to achieve superior production compared to traditional aftermarket systems.

  • Innovative: Automated operation from rough dozing to finish grade
  • Intelligent: New dozing mode and load control performance features
  • Designed for the machine: 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
  • Fully supported: Get assistance via Komatsu’s service and support network


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.

Comfortable Ride with Heated Operator Seat

The operator seat has adjustable lumbar support, tilt and an electric heater. It is easy to adjust to the operator's shape. Also, the standard seat heat makes it possible to work comfortably in the winter.

Easy Maintenance

Planned maintenance and daily checks are the only way to ensure long service life from equipment. That’s why Komatsu designed the D61EX/PX-24 with conveniently located maintenance points to make necessary inspec-tions and maintenance quick and easy.

Hydraulically-driven swing-up fan
The D61EXi/PXi-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 can be used for periodic cooler cleaning.

Electronic Controlled Hydraulic System

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

Fuel Efficiency

The HST control system can reduce fuel consumption.

Heavy-Duty Aftertreatment System

This new system combines a Komatsu Diesel Particulate Filter (KDPF) and Selective Catalytic Reduction (SCR). The SCR NOx reduction system injects the correct amount of DEF at the proper rate, transforming NOx into non-toxic water (H2O) and nitrogen gas (N2).

Heavy-Duty Cooled Exhaust Gas Recirculation (EGR) System

The system recirculates a portion of exhaust gas into the air intake and lowers combustion temperatures, thereby reducing NOx emissions. EGR gas flow has been decreased for Tier 4 Final with the addition of SCR technology. The system achieves a dynamic reduction of NOx, while helping reduce fuel consumption below Tier 4 Interim levels.

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, providing close-to- complete combustion to reduce PM emissions. The system uses high pressure injection, thereby reducing both PM emissions and fuel consumption over the entire range of engine operating conditions. The Tier 4 Final engine has advanced fuel injection timing for reduced fuel consumption and lower soot levels.

Komatsu Auto Idle Shutdown

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 Variable Geometry Turbocharger (KVGT) system

The KVGT system features proven Komatsu design hydraulic technology for variable control of air-flow and supplies optimal air according to load conditions. It provides better exhaust temperature management. The Tier 4 final version has an improved propeller design for increased performance.

Multi-Monitor with Troubleshooting Function to Minimize Down Time

Various meters, gauges and warning functions are centrally arranged on the multi-monitor. The monitor simplifies start-up inspection and promptly warns the operator with a lamp and buzzer if any abnormalities occur. In addition, countermeasures are indicated in 4 levels to help prevent major machine problems. Replacement times for required PM services are also indicated.

Parallel Link Undercarriage System (PLUS)

Komatsu's new PLUS provides less downtime, plus longer wear 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. This blade is available for the D61EXi/PXi-24 machines. The hydraulic blade tilt, angling function (and manually adjustable blade pitch) expand versatility and productivity in a variety of applications.


The low-effort PCCS joystick controls all directional movements, including machine travel speed as well as counter-rotation.

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.

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 saving, the monitor panel allows the operator to easily switch the  working mode, depending on the work at hand.

P mode (Power mode)
With P mode, the engine outputs its full power, allowing the machine to perform the work requiring large production, heavy-loads 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.

H mode (high engine idle speed mode)
This setting allows subtle changes in load to be detected, which is tailor-made for power-intensive work. Compared to P mode, the engine high-idle speed is higher in H mode.

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.

Unrivaled Blade Visibility

The D61EXi/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 SAA6D107E-3*
4-cycle, water-cooled, direct injection
Komatsu Variable Geometry Turbocharged, air-to-air aftercooled, cooled EGR
Number of cylinders
Bore x stroke 107 mm x 124 mm 4.21" x 4.88"
Piston displacement 6.69 ltr 408 in³
All-speed and mid-range, electronic

    SAE J1995 - Gross 127 kW 170 HP
    ISO 9249 / SAE J1349 - Net 125 kW 168 HP
    Hydraulic fan at maximum speed - Net
 113 kW
152 HP
Rated rpm
2200 rpm
Fan drive type
Lubrication system:

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

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)* Forward Reverse
1st 0-3.4 km/h
0-2.1 mph
0-4.1 km/h
0-2.5 mph
2nd 0-5.6 km/h
0-3.5 mph
0-6.5 km/h
0-4.0 mph
3rd 0-9.0 km/h
0-5.6 mph
0-9.0 km/h
0-5.6 mph
Travel speed (variable mode) 0-9.0 km/h
0-5.6 mph
0-9.0 km/h
0-5.6 mph
*Quick shift speeds are adjustable in the monitor.

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 for easy displacement.

Steering System

PCCS joystick control for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it backward 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. HST eliminates steering clutches and brakes, providing smooth, powerful turns. Fully electronic control enables smooth operation. The PCCS utilizes shift buttons to increase and decrease speed.

Minimum turning radius
2.3 m 91"


Oscillating-type with equalizer bar and pivot shafts

Track roller frame
Monocoque, large section, durable construction

Rollers and idlers
Lubricated track rollers

Lubricated tracks
Parallel Link Undercarriage System (PLUS) with lubricated rotating bushings for extended system wear life and lower maintenance costs. Track tension is adjusted easily with grease gun.

Number of track rollers (each side)
Type of shoes (standard)
Single grouser
Number of shoes (each side)
Grouser height 57.5 mm 2.3"
Shoe width (standard) 860 mm 34"
Ground contact area 54440 cm² 8,438 in²
Ground pressure
(with dozer, ROPS canopy):
31.78 kPa
0.32 kgf/cm²
Track gauge 2130 mm 7'0"
Length of track on ground 3165 mm 10'4"

Service Refill Capacities

Coolant 45 ltr 11.9 U.S. gal
Fuel tank 372 ltr 98.3 U.S. gal
Engine oil 27 ltr 7.2 U.S. gal
Hydraulic tank 101 ltr 26.7 U.S. gal
Final drive (each side) 8.1 ltr 2.2 U.S. gal
DEF tank
20.6 ltr
5.4 U.S. gal

Operating Weight (APROXIMATE)

Tractor weight:
Including ROPS (ISO 3471) cab, C frame for PAT dozer, rated capacity of lubricant, coolant, full fuel tank, operator and standard equipment.

D61PXi-24 18440 kg 40,653 lb

Operating weight:
Including PAT dozer, ROPS (ISO 3471) cab, operator, standard equipment, rated capacity of lubricant, coolant and full fuel tank.

D61PXi-24 19580 kg 43,167 lb

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 27.4MPa
280 kg/cm²
3,974 psi
Hydraulic cylinders
Double-acting, piston type
Hydraulic cylinders: Number of cylinders Bore
    Blade lift 2 100 mm 4"
    Blade tilt 1 120 mm 5"
    Blade angle 2 110 mm 4"
Hydraulic oil capacity (refilling):

    Power angle tilt dozer 101 ltr 26.7 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


  • 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
  • Curved exhaust pipe
  • Decelerator pedal (single pedal)
  • Engine hood
  • Engine intake centrifugal precleaner
  • Engine, swing open side cover
  • Engine shutdown secondary switch
  • Komatsu123456
  • Fluid sampling ports
  • Front pull hook
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with reverse clean mode
  • Hydraulics for rear equipment
  • intelligent Machine Control 2.0
  • Komatsu Diesel Particulate Filter (KDPF)
  • Locks, filler caps and covers
  • 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)
      – Bluetooth/USB compatible radio with remote AUX plug (3.5 mm)
      – 76 dBA
    • LED worklights
  • 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
  • Tie off points standard (ISO 14567)
  • Track roller guards, center and end sections
  • Track shoe assembly
    – Heavy-Duty lubricated rotary bushing (PLUS) track
    • 610 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
  • Variable Geometry Turbocharger (VGT)
  • 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, rigid type
  • Track roller guard, full length

Multi-shank ripper

  • 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"