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Mid-size dozer

D61EX-24

  • Horsepower 125 kW @ 2 200 rpm 168 HP @ 2,200 rpm
  • Operating weight 18 520 kg 40,830 lbs.
  • Blade capacity 3.37 m³ 4.41 yd³

A mid-size dozer built for versatility

Versatile to accomplish any task, the D61EX-24 brings excellent visibility to all your projects. The second-generation mid-size dozer comes with a new H mode that helps operators maintain ground speed while operating under heavy loads.

  • Next step up in size
  • Can step in for some heavier dozing
  • Fuel consumption is reduced up to an additional 5% over prior model

Features and benefits

Parallel Link Undercarriage System (PLUS)

Designed to wear evenly so the machine provides close to 100% usage of undercarriage components, Komatsu PLUS undercarriage lowers undercarriage maintenance costs by up to 40% over a conventional undercarriage. Strengthened rollers and links increase wear life up to two times.

PAT dozer with adjustable pitch

Expand your productivity and gain more versatility in a variety of applications with a power angle tilt (PAT) dozer blade with adjustable blade pitch system.

Exceptional blade visibility

An innovative super-slant nose design provides excellent blade visibility for improved machine control and increased efficiency and productivity.

HST with electronic control

Fully electronic control provides complete automatic shifting and enables smooth control. Equipped with Komatsu-designed HST, this machine allows for Quick-Shift or variable speed selection.

Easy-access maintenance features

A swing-up fan with a gas strut-assisted lift system provides easy access to the radiator, oil cooler and charge air cooler. The hydraulic fan has a reversing fan for cleaning any objects that are restricting air flow.

Palm command control system lever

Designed for your operator’s comfort and ease of use, the ergonomic, low-effort palm command control system (PCCS) joystick controls all directional movements, including machine travel speed, as well as counter-rotation.

Specifications for D61EX-24

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US system Metric
Engine
Model Komatsu SAA6D107E-3*
Type 4-cycle, water-cooled, direct injection
Aspiration Komatsu Variable Geometry Turbocharged, air-to-air aftercooled, cooled EGR
Number of cylinders 6
Bore x stroke 107 x 124 mm
Piston displacement 6.69 L
Governor All-speed and mid-range, electronic
Horsepower:  
SAE J1995 - Gross 127 kW
ISO 9249 / SAE J1349 - Net 125 kW
Rated rpm 2 200 rpm
Fan drive type Hydraulic
Lubrication system:  
Method Gear pump, force lubrication
Filter Full-flow
*EPA Tier 4 Final emissions certified  
Model Komatsu SAA6D107E-3*
Type 4-cycle, water-cooled, direct injection
Aspiration Komatsu Variable Geometry Turbocharged, air-to-air aftercooled, cooled EGR
Number of cylinders 6
Bore x stroke 4.21 x 4.88 in
Piston displacement 408 in³
Governor All-speed and mid-range, electronic
Horsepower:  
SAE J1995 - Gross 170 HP
ISO 9249 / SAE J1349 - Net 168 HP
Rated rpm 2,200 rpm
Fan drive type Hydraulic
Lubrication system:  
Method Gear pump, force lubrication
Filter Full-flow
*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 kph 0-4.1 kph
2nd 0-5.6 kph 0-6.5 kph
3rd 0-9.0 kph 0-9.0 kph
Travel speed (variable mode) 0-9.0 kph 0-9.0 kph

*Quick shift speeds are adjustable in the monitor.

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 0-2.1 mph 0-2.5 mph
2nd 0-3.5 mph 0-4.0 mph
3rd 0-5.6 mph 0-5.6 mph
Travel speed (variable mode) 0-5.6 mph 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 damaged by debris. Bolt-on sprocket for easy displacement.

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 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 control. The PCCS utilizes shift buttons to increase and decrease speed.

Minimum turning radius 2.1 m

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 control. The PCCS utilizes shift buttons to increase and decrease speed.

Minimum turning radius 83 in
Undercarriage

Suspension: 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 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 height 57.5 mm
Shoe width (standard) 600 mm
Ground contact area 37 980 cm²
Ground pressure
(with dozer, ROPS canopy):
43.2 kPa
0.44 kgf/cm²
Track gauge 1900 mm
Length of track on ground 3165 mm

Suspension: 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 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 height 2.3 in
Shoe width (standard) 24
Ground contact area 5,887 in²
Ground pressure
(with dozer, ROPS canopy):
6.27 psi
Track gauge 6 ft. 3 in
Length of track on ground 10 ft. 5 in
Service refill capacities
Coolant 45 L
Fuel tank 372 L
Engine oil 27 L
Hydraulic tank 101 L
Final drive (each side) 8.1 L
DEF tank 20.6 L
Coolant 11.9 US gal
Fuel tank 98.3 US gal
Engine oil 7.2 US gal
Hydraulic tank 26.7 US gal
Final drive (each side) 2.2 US gal
DEF tank 5.4 US gal
Operating weight (approximate)
Tractor weight:
Including ROPS (ISO 3471) cab, C frame for PAT dozer, rated capacity of lubricant, coolant, full fuel tank, operator and standard equipment.
17 530 kg
Operating weight:
Including PAT dozer, ROPS (ISO 3471) cab, operator, standard equipment, rated capacity of lubricant, coolant and full fuel tank.
18 520 kg
Tractor weight:
Including ROPS (ISO 3471) cab, C frame for PAT dozer, rated capacity of lubricant, coolant, full fuel tank, operator and standard equipment.
38,647 lbs.
Operating weight:
Including PAT dozer, ROPS (ISO 3471) cab, operator, standard equipment, rated capacity of lubricant, coolant and full fuel tank.
40,830 lbs.
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 280 kg/cm² 27.4MPa
Hydraulic cylinders Double-acting, piston type
Hydraulic cylinders / Number of cylinders Bore
Blade lift / 2 100 mm
Blade tilt / 1 120 mm
Blade angle / 2 110 mm
Hydraulic oil capacity (refilling):  
Power angle tilt dozer 101 L
Control valves:  
3-spool control valve for Power Angle Tilt dozer  
Positions:  
    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  
Positions:  
    Ripper lift Raise, hold, and lower

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
Hydraulic cylinders Double-acting, piston type
Hydraulic cylinders / Number of cylinders Bore
Blade lift / 2 3.9 in
Blade tilt / 1 4.7 in
Blade angle / 2 4.3 in
Hydraulic oil capacity (refilling):  
Power angle tilt dozer 26.7 US gal
Control valves:  
3-spool control valve for Power Angle Tilt dozer  
Positions:  
    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  
Positions:  
    Ripper lift Raise, hold, and lower
  • 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/90 A
  • Back-up alarm
  • Batteries, large capacity 24 V/200 Ah
  • Cab accessories
    — 12 V × 2 power supply
    — Cup holder
    — Rear view mirror
    — Rear view monitor system (1 camera)
    — Bluetooth/USB compatible radio with remote AUX plug (3.5 mm)
  • Crankcase guard and underguard
  • Decelerator/brake pedal (Single pedal)
  • Electronically controlled Hydrostatic Transmission (HST) with quick-shift and variable speed settings
  • Electronic monitor panel with on-board diagnostics
  • Engine hood and side panels
  • Engine, KOMATSU SAA6D107E-3, gross output of 127 kW, direct injection, water-cooled turbocharged, air-to-air aftercooler, cooled EGR, EPA Tier 4 Final and EU Stage 4 emissions certified
  • Engine secondary shutdown switch
  • Equalizer bar grease port
  • Fan, hydraulic driven, electronic control
  • Filler cap locks and cover locks
  • Fluid sampling ports
  • 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
  • Hydraulics for rear equipment
  • Intake pipe with precleaner
  • Komatsu Diesel Particulate Filter (KDPF)
  • KOMTRAX Level 5.0
  • Large high-resolution LCD color monitor
  • LED worklights
  • Lunch box holder
  • Marks and plates, English
  • 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
    Meets ISO 3471, SAE J/ISO 3471 ROPS standards, and ISO 3449 FOPS standard.
  • Seat belt, 76 mm retractable
  • Seat belt indicator
  • Seat, air suspension, fabric, heated, low back, headrest
  • Shovel holder
  • Starting motor, 24 V/5.5 kW
  • Selective Catalytic Reduction (SCR)
  • Self adjusting roller
  • Side by side rear mounted cooling package
  • Sprockets, bolt-on
  • Sprocket inner guard
  • Tie off points standard (ISO 14567)
  • Track roller guards, end section
  • Track shoe assembly (PLUS)
    —Sealed and lubricated
    D61EX-24: 600 mm single grouser shoe
    D61PX-24: 860 mm single grouser shoe
  • Triple labyrinth final drive shield design
  • 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

  • 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/90 A
  • Back-up alarm
  • Batteries, large capacity 24 V/200 Ah
  • Cab accessories
    — 12 V × 2 power supply
    — Cup holder
    — Rear view mirror
    — Rear view monitor system (1 camera)
    — Bluetooth/USB compatible radio with remote AUX plug (3.5 mm)
  • Crankcase guard and underguard
  • Decelerator/brake pedal (Single pedal)
  • Electronically controlled Hydrostatic Transmission (HST) with quick-shift and variable speed settings
  • Electronic monitor panel with on-board diagnostics
  • Engine hood and side panels
  • Engine, KOMATSU SAA6D107E-3, gross output of 170 HP, direct injection, water-cooled turbocharged, air-to-air aftercooler, cooled EGR, EPA Tier 4 Final and EU Stage 4 emissions certified
  • Engine secondary shutdown switch
  • Equalizer bar grease port
  • Fan, hydraulic driven, electronic control
  • Filler cap locks and cover locks
  • Fluid sampling ports
  • 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
  • Hydraulics for rear equipment
  • Intake pipe with precleaner
  • Komatsu Diesel Particulate Filter (KDPF)
  • KOMTRAX Level 5.0
  • Large high-resolution LCD color monitor
  • LED worklights
  • Lunch box holder
  • Marks and plates, English
  • 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
    Meets ISO 3471, SAE J/ISO 3471 ROPS standards, and ISO 3449 FOPS standard.
  • Seat belt, 3" retractable
  • Seat belt indicator
  • Seat, air suspension, fabric, heated, low back, headrest
  • Shovel holder
  • Starting motor, 24 V/5.5 kW
  • Selective Catalytic Reduction (SCR)
  • Self adjusting roller
  • Side by side rear mounted cooling package
  • Sprockets, bolt-on
  • Sprocket inner guard
  • Tie off points standard (ISO 14567)
  • Track roller guards, end section
  • Track shoe assembly (PLUS)
    —Sealed and lubricated
    D61EX-24: 24" single grouser shoe
    D61PX-24: 34" single grouser shoe
  • Triple labyrinth final drive shield design
  • 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, long type
  • Track roller guard, full length

Multi-shank ripper

  • Weight: 1757 kg
  • Beam length: 2170 mm
  • Maximum lift above ground: 560 mm
  • Maximum digging depth: 665 mm
  • Dozer assembly
  • Drawbar, long type
  • Track roller guard, full length

Multi-shank ripper

  • Weight: 3,874 lb
  • Beam length: 7'1"
  • Maximum lift above ground: 1'8"
  • Maximum digging depth: 2'2"
Support you can count on

Technology that works as hard as you do

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Komtrax for construction equipment is Komatsu’s state of the art remote monitoring system, helping you keep track of where your machines are and how much they are working. The system seamlessly gathers important data that can help you coach operators to improve efficiencies and productivity.

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