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Metric
Imperial (US)
Dozers
D51EX-24
Crawler dozers
- Blade capacity (m^3) 2.7
- Blade capacity (yd^3) 3.5
- Horsepower (HP) 131 HP @ 2,200 rpm
- Horsepower (kW) 98 kW @ 2 200 rpm
- Operating weight (kg) 13 699
- Operating weight (lbs) 30,203
Fast and accurate grading
Combine a super slant nose with 3D grade control for a fast and accurate grading system. The D51EX-24 sets the standard for general-purpose construction dozers and provides your operator excellent blade visibility while working any job.
- Production increased by up to 15% over prior model
- Up to 13% reduced fuel consumption 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
- Full specs
- Standard equipment
- Optional equipment
Metric
Imperial (US)
Expand all
- Suspension: Rigid type
- Track roller frame: Monocoque, large section, durable construction
- Rollers and idlers: Lubricated track rollers
- Type of shoes (standard): Single grouser
- Number of track rollers (each side): 7
- Number of shoes (each side): 44
- Sealed and lubricated track: Track tension is easily adjusted with grease gun
- Grouser height (in): 2.2
- Grouser height (mm): 55
- Shoe width (standard)(mm): 560
- Shoe width (standard)(in): 22
- Ground contact area (cm^2): 30 750
- Ground contact area (ft2): 33.1
- Ground pressure (with standard shoe)(ISO 16754)(kpa): 39.9
- Ground pressure (with standard shoe)(ISO 16754)(psi): 5.79
- Ground pressure (with standard shoe)(ISO 16754)(kg/cm^2): 0.40
- Track gauge (mm): 1 790
- Track gauge (ft): 5 ft. 10 in
- Length of track on ground (ft): 9 ft. 0 in
- Length of track on ground (mm): 2 745
- Hydraulic system features: Closed-Center Load Sensing System (CLSS) designed for precise and responsive control, and for efficient simultaneous operation.
- Hydraulic control unit (ltr/min): All spool control valves externally mounted remote to the hydraulic tank. Piston-type hydraulic pump with capacity (discharge flow) of 97 ltr/min at rated engine rpm.
- Hydraulic control unit (U.S. gal/min): All spool control valves externally mounted remote to the hydraulic tank. Piston-type hydraulic pump with capacity (discharge flow) of 26 U.S. gal/min at rated engine rpm.
- Relief valve setting (psi): 3,974
- Relief valve setting (kg/cm^2): 280
- Relief valve setting (MPa): 27.4
- Control valve: 3-spool control valve for power angle tilt dozer
-
Number of cylinders
- Blade tilt /1 (mm): 100
- Blade tilt /1 (in): 4
- Blade lift / 2 (in): 3.5
- Blade lift / 2 (mm): 90
- Blade angle / 2 (in): 3.5
- Blade angle / 2 (mm): 90
-
Hydraulic oil capacity (refill)
- Power angle tilt dozer (L): 64
- Power angle tilt dozer (US gal): 17
-
Hydraulic cylinders
- Hydraulic cylinders: Double-acting, piston type
-
- Blade lift: Raise, hold, lower, and float
- Blade tilt: Right, hold, and left
- Blade angle: Right, hold, and left
- Ripper lift: Raise, hold and lower
Positions
- Dozers type: 4-cycle, water-cooled, direct injection
- Aspiration: Variable geometry, water-cooled, turbocharged, air-to-air aftercooled
- Number of cylinders: 4
- Bore x stroke (mm): 107 x 124
- Bore x stroke (in): 4.21 x 4.88
- Piston displacement (L): 4.5
- Piston displacement (in^3): 275
- Governor: All-speed, electronic
- Footnote: *EPA Tier 4 Final emissions certified
- Engine model: Komatsu SAA4D107E-3*
-
Horsepower
- SAEJ1995 - Gross (HP): 133
- SAEJ1995 - Gross (kW): 99
- ISO 9249 / SAE J1349 - Net (HP): 131
- ISO 9249 / SAE J1349 - Gross (kW): 98
- Rated rpm: 2,200
- Fan drive type: Hydraulic
- Hydraulic fan at maximum speed - net (HP): 122
- Hydraulic fan at maximum speed - net (kW): 91
-
Lubrication system
- Filter: Full-flow
- Method: Gear pump, force lubrication
- Fuel tank (US gal): 71.3
- Fuel tank (L): 270
- Diesel Exhaust Fluid (DEF) tank (L): 20.5
- Diesel Exhaust Fluid (DEF) tank (US gal): 5.4
- Coolant (L): 37
- Coolant (US gal): 9.8
- Engine oil (US gal): 4.2
- Engine oil (L): 16
- Final drive (US gal): 1.5
- Final drive (L): 5.5
- Hydraulic tank (L): 64
- Hydraulic tank (US gal): 17
- Hydrostatic transmission features: Dual-path, hydrostatic transmission provides infinite speed changes up to 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.
- Hydrostatic transmission footnote: *Quick shift speeds are adjustable in the monitor.
-
Reverse
- 1st reverse (mph): 0 - 2.5
- 1st reverse (kph): 0 - 4.1
- 2nd reverse (kph): 0 - 6.5
- 2nd reverse (mph): 0 - 4.0
- 3rd reverse (kph): 0 - 9.0
- 3rd reverse (mph): 0 - 5.6
- Travel speed reverse (variable mode) (kph): 0 - 9.0
- Travel speed reverse (variable mode) (mph): 0 - 5.6
-
Forward
- 1st forward (kph): 0 - 3.4
- 1st forward (mph): 0 - 2.1
- 2nd forward (kph): 0 - 5.6
- 2nd forward (mph): 0 - 3.5
- 3rd forward (mph): 0 - 5.6
- 3rd forward (kph): 0 - 9.0
- Travel speed forward (variable mode) (mph): 0 - 5.6
- Travel speed forward (variable mode) (kph): 0 - 9.0
- Operator weight (approximate): Operating weight: Including Power Angle Tilt (PAT) dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, hydraulic control unit, coolant, and full fuel tank.
-
Tractor weight
- Tractor weight (kg): 12 330
- Tractor weight (lbs): 27,182
- Tractor weight inclusions: Including ROPS cab, U frame for Power Angle Tilt (PAT) dozer, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.
-
Operating weight
- Operating weight (lbs): 30,203
- Operating weight (kg): 13 699
- Final drive features: 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 ring with triple labyrinth seal design.
- Steering system features: Palm Command Control System (PCCS) joystick control for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it back 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 (m): 2.4*
- Minimum turning radius (in): 94*
- Steering system footnote: *As measured by track marks on the ground at pivot turn.
Metric
Imperial (US)
- 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/85 A
- Back-up alarm
- Batteries, large capacity 24 V/92 Ah
- Cab accessories
— 12 V × 2 power supply
— Cup holder
— Rear view mirror
— Rear view monitor system
— 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 SAA4D107E-3, gross output of 131 HP, direct injection, water-cooled turbocharged, air-to-air aftercooler, cooled EGR, EPA Tier 4 Final and EU Stage 4 emissions certified
- 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
- Intake pipe with precleaner
- Komatsu Diesel Oxidation Catalyst (KDOC)
- KOMTRAX Level 5.0
- Large high-resolution LCD
- 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, air suspension, fabric, heated, low back, headrest
- Shovel holder
- Starting motor, 24 V/4.5 kW
- Selective Catalytic Reduction (SCR)
- Self adjusting roller
- Sprockets, bolt-on
- Sprocket inner guard
- Track roller guards, end section
- Track shoe assembly (PLUS)
— Sealed and lubricated
D51EX-24: 22" single grouser shoe
D51PX-24: 28" single grouser shoe - Triple labyrinth final drive
- Water separator
- 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/85 A
- Back-up alarm
- Batteries, large capacity 24 V/92 Ah
- Cab accessories
— 12 V × 2 power supply
— Cup holder
— Rear view mirror
— Rear view monitor system
— 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 SAA4D107E-3, gross output of 98 kW, direct injection, water-cooled turbocharged, air-to-air aftercooler, cooled EGR, EPA Tier 4 Final and EU Stage 4 emissions certified
- 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
- Intake pipe with precleaner
- Komatsu Diesel Oxidation Catalyst (KDOC)
- KOMTRAX Level 5.0
- Large high-resolution LCD
- 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, air suspension, fabric, heated, low back, headrest
- Shovel holder
- Starting motor, 24 V/4.5 kW
- Selective Catalytic Reduction (SCR)
- Self adjusting roller
- Sprockets, bolt-on
- Sprocket inner guard
- Track roller guards, end section
- Track shoe assembly (PLUS)
— Sealed and lubricated
D51EX-24: 560 mm single grouser shoe
D51PX-24: 710 mm single grouser shoe - Triple labyrinth final drive
- Water separator
Metric
Imperial (US)
- Dozer assembly
- Hitch
- Hydraulics for rear equipment
- Track roller guard, full length
Multi-shank ripper:
- Weight: 1,874 lb
- Beam length: 5'1"
- Maximum lift above ground: 1'3"
- Maximum digging depth: 1'8"
- Number of shanks: 3
- Dozer assembly
- Hitch
- Hydraulics for rear equipment
- Track roller guard, full length
Multi-shank ripper
- Weight: 860 kg
- Beam length: 1556 mm
- Maximum lift above ground: 380 mm
- Maximum digging depth: 425 mm
- Number of shanks: 3
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