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Mid-size dozer

D71PX-24

  • Horsepower 177 kW @ 2 200 rpm 237 HP @ 2,200 rpm
  • Operating weight 23 100 - 23 900 kg 50,927 - 52,690 lbs.
  • Blade capacity 4.7 - 5.1 m³ 6.1 - 6.6 yd³

An all-around dozer that delivers

Versatile enough to accomplish rough dozing to grading, Komatsu’s largest hydrostatic transmission dozer H mode helps operators maintain ground speed while operating under heavy loads. Distinctive slant nose design offers operators exceptional visibility and precision on the job site.

  • Lower ground pressure than D71EX
  • 4% more efficient over D65PX VPAT
  • Fast travel and steering response from HST drive

Features and benefits

Outstanding visibility for your operators

Outstanding visibility to the cutting edges and excellent balance and maneuverability with a super-slant nose cab-forward design.

Smooth shifting and control

Smooth, powerful turns with hydrostatic steering. Fully electronic control provides complete automatic shifting and allows for Quick-Shift or variable speed selection.

Choose the right mode for the job

In P mode, the engine outputs its full power to help your operator perform heavy-load work. It automatically increases engine speed for maximum power when load increases. H mode increases engine high idle speed, suitable for power-intensive work.

Versatile and productive adjustable blade

Flexibility to adapt to various situations and the ability to be efficient and productive regardless of the terrain with a versatile 6-way PAT (power angle tilt) blade pitch system.

Easy-access maintenance features

Easy access to the radiator, oil cooler and charge air cooler with swing-up assisted lift system. Hydraulic fan reverses for clearing objects restricting air flow. Rear-mounted single-plane cooling system swings up for fast service.

Long-lasting undercarriage

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.

Ready for low ground pressure needs

To provide your operation with even more versatility and adaptability, the D71 is available with an optional 36-inch wide shoe for low ground pressure applications.

Comfortable, ergonomic controls

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 and counter-rotation.

Bluetooth/USB-compatible radio

To help maximize operator comfort and connectivity, the D71 comes with standard Bluetooth AM/FM radio and additional AUX and USB connection capability.

Specifications for D71PX-24

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US system Metric
Engine
Model Komatsu SAA6D114E-6*
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 114 x 144.5 mm
Piston displacement 8.85 L
Governor All-speed and mid-range, electronic
Horsepower:  
    SAE J1995 - Gross 179 kW
    ISO 9249 / SAE J1349 - Net 177 kW
    Hydraulic fan at maximum speed 159 kW
Rated rpm 2 100 rpm
Fan drive type Hydraulic
Lubrication system:  
    Method Gear pump, force lubrication
    Filter Full-flow
*EPA Tier 4 Final emissions certified  
Model Komatsu SAA6D114E-6*
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 4.5 x 5.7 in
Piston displacement 540 in³
Governor All-speed and mid-range, electronic
Horsepower:  
    SAE J1995 - Gross 240 HP
    ISO 9249 / SAE J1349 - Net 237 HP
    Hydraulic fan at maximum speed 213 HP
Rated rpm 2,100 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 extensive speed changes up to 11 km/h. 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 0-3.8 kph 0-4.5 kph
2nd 0-6.5 kph 0-7.5 kph
2.5th 0-8.4 kph 0-9.3 kph
3rd 0-11 kph 0-11 kph
Travel speed
(variable mode)
0.8-11 kph 0.8-11 kph

*Quick shift speeds are adjustable in the monitor

Dual-path, hydrostatic transmission provides extensive speed changes up to 6.8 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 0-2.4 mph 0-2.8 mph
2nd 0-4 mph 0-4.7 mph
2.5th 0-5.2 mph 0-5.8 mph
3rd 0-6.8 mph 0-6.8 mph
Travel speed
(variable mode)
0.5-6.8 mph 0.5-6.8 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 can reduce risk of damage 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 can reduce 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
 
D71PX-24/ D71PXi-24 3.1 m
D71PX-24 Wide/ D71PXi-24 Wide 3.3 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 operation. The PCCS utilizes shift buttons to increase and decrease speed.

Minimum turning radius
 
D71PX-24/ D71PXi-24 10 ft. 2 in
D71PX-24 Wide/ D71PXi-24 Wide 10 ft. 10 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 adjusted easily with grease gun.

  D71PX-24/
D71PXi-24
D71PX-24 Wide/
D71PXi-24 Wide
Number of track rollers (each side) 8 8
Type of shoes (standard) Single grouser Single grouser
Number of shoes (each side) 45 45
Grouser height 65 mm 65 mm
Shoe width (standard) 760 mm 915 mm
Ground contact area 49 780 cm2 59 930 cm2
Ground pressure
(with dozer, ROPS cab)
(ISO 16754)
40 kPa 35 kPa
Track gauge 2 230 mm 2 385 mm
Length of track on ground 3 275 mm 3 275 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 adjusted easily with grease gun.

  D71PX-24/
D71PXi-24
D71PX-24 Wide/
D71PXi-24 Wide
Number of track rollers (each side) 8 8
Type of shoes (standard) Single grouser Single grouser
Number of shoes (each side) 45 45
Grouser height 2.6 in 2.6 in
Shoe width (standard) 30 in 36 in
Ground contact area 53.6 ft2 64.5 ft2
Ground pressure
(with dozer, ROPS cab)
(ISO 16754)
5.8 psi 5.0 psi
Track gauge 7 ft. 3 in 7 ft. 10 in
Length of track on ground 10 ft. 8.9 in 10 ft. 8.9 in
Service refill capacities
Coolant 54.5 L
Fuel tank 439 L
Engine oil 30.5 L
Hydraulic ta 154 L 
Final drive (each side) 10 L
DEF tank 20 L
Coolant 14.4 US gal
Fuel tank 116.0 US gal
Engine oil 8.1 US gal
Hydraulic ta 40.7 US gal
Final drive (each side) 2.6 US gal
DEF tank 5.3 US gal
Operating weight (approximate)

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

D71PXi-24 21 800 kg
D71PXi-24 Wide 22 500 kg

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

D71PX-24 23 100 kg
D71PX-24 Wide 23 900 kg
D71PXi-24 23 200 kg
D71PXi-24 Wide 24 000 kg

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

D71PXi-24 48,061 lbs.
D71PXi-24 Wide 49,604 lbs.

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

D71PX-24 50,927 lbs.
D71PX-24 Wide 52,690 lbs.
D71PXi-24 51,147 lbs.
D71PXi-24 Wide 52,911 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 235 L/min at rated engine rpm.

Relief valve setting 28.8 MPa 294 kg/cm²
Hydraulic cylinders Double-acting, piston type
    (Number of cylinders) Bore
    Blade lift (2) 120 mm
    Blade tilt (1) 130 mm
    Blade angle (2) 110 mm
Hydraulic oil capacity (refill):  
    Power angle tilt dozer 154 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 62.3 US gpm at rated engine rpm.

Relief valve setting 4,177 psi
Hydraulic cylinders Double-acting, piston type
    (Number of cylinders) Bore
    Blade lift (2) 4.7 in
    Blade tilt (1) 5.1 in
    Blade angle (2) 4.3 in
Hydraulic oil capacity (refill):  
    Power angle tilt dozer 40.7 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
  • Air cleaner, double element with dust indicator
  • Air suspension seat with operator presence sensing system
  • Alternator, 24 V/90 A
  • Backup alarm
  • Batteries, 2 x 12 V/140 Ah
  • Closed engine hood
  • Color monitor, Liquid Crystal Display (LCD)
  • Decelerator/brake pedal (Single pedal)
  • Engine intake precleaner (Auto eject)
  • Expansion tank
  • Fuel prefilter with water separator
  • High mount foot rests
  • Hitch type drawbar
  • Hydraulically driven cooling fan with clean mode
  • Komatsu Diesel Particulate Filter (KDPF) with curved exhaust pipe
  • Locks, filler caps and covers
  • Radiator mask, swing up
  • Rear view monitor system
  • Starting motor, 11 kW/24 V
  • Steering system: HST system
  • Tie-offs
  • Track roller guard, center and end section
  • Track shoe assembly
    —Parallel Link Undercarriage System (PLUS) link
    610 mm single grouser shoe (EX)
    760 mm single grouser shoe (PX)
    915 mm single grouser shoe (PX wide)
  • Underguards:
    Oil pan and hydraulic pumps

    ROPS cab*

  • Air conditioner (A/C)
  • AUX-injack
  • Cab accessories
    —12 V x 2 power supply
    —Cup holder
    —Rear view mirror
  • Front pull hook
  • LED lights
  • Multifunction Audio
  • Work lamps (Front 4, rear 2)

* Dozer assembly and rear mounted equipment are not included in base machine standard equipment
** Cab meets ROPS (ISO 3471) and FOPS (ISO 3449) Level 2 standards

  • Air cleaner, double element with dust indicator
  • Air suspension seat with operator presence sensing system
  • Alternator, 24 V/90 A
  • Backup alarm
  • Batteries, 2 x 12 V/140 Ah
  • Closed engine hood
  • Color monitor, Liquid Crystal Display (LCD)
  • Decelerator/brake pedal (Single pedal)
  • Engine intake precleaner (Auto eject)
  • Expansion tank
  • Fuel prefilter with water separator
  • High mount foot rests
  • Hitch type drawbar
  • Hydraulically driven cooling fan with clean mode
  • Komatsu Diesel Particulate Filter (KDPF) with curved exhaust pipe
  • Locks, filler caps and covers
  • Radiator mask, swing up
  • Rear view monitor system
  • Starting motor, 11 kW/24 V
  • Steering system: HST system
  • Tie-offs
  • Track roller guard, center and end section
  • Track shoe assembly
    —Parallel Link Undercarriage System (PLUS) link
    24" single grouser shoe (EX)
    30" single grouser shoe (PX)
    36" single grouser shoe (PX wide)
  • Underguards:
    Oil pan and hydraulic pumps

    ROPS cab*

  • Air conditioner (A/C)
  • AUX-injack
  • Cab accessories
    —12 V x 2 power supply
    —Cup holder
    —Rear view mirror
  • Front pull hook
  • LED lights
  • Multifunction Audio
  • Work lamps (Front 4, rear 2)

* Dozer assembly and rear mounted equipment are not included in base machine standard equipment
** Cab meets ROPS (ISO 3471) and FOPS (ISO 3449) Level 2 standards

  • Hydraulics for ripper (EXI)
  • Long drawbar
  • Scoop holder
  • Tool kit
  • Track roller guard, full length
  • Hydraulics for ripper (EXI)
  • Long drawbar
  • Scoop holder
  • Tool kit
  • Track roller guard, full length
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