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Small dozer

D51EX-24

  • Horsepower 98 kW @ 2 200 rpm 131 HP @ 2,200 rpm
  • Operating weight 13 980 kg 30,821 lbs.
  • Blade capacity 2.7 m³ 3.5 yd³

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 for D51EX-24

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US system Metric
Engine
Model   Komatsu SAA4D107E-3*
Type   4-cycle, water-cooled, direct injection
Aspiration   Variable geometry, water-cooled, turbocharged,
air-to-air aftercooled
Number of cylinders   4
Bore x stroke 107 x 124 mm 107 x 124 mm
Piston displacement 4.5 L 4.5 L
Governor   All-speed, electronic
Horsepower:    
SAE J1995 - Gross 99 kW 99 kW
ISO 9249 / SAE J1349 - Net 98 kW 98 kW
Hydraulic fan at maximum speed - Net 91 kW 91 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 SAA4D107E-3*
Type 4-cycle, water-cooled, direct injection
Aspiration Variable geometry, water-cooled, turbocharged,
air-to-air aftercooled
Number of cylinders 4
Bore x stroke 4.21 x 4.88 in
Piston displacement 275 in³
Governor All-speed, electronic
Horsepower:  
SAE J1995 - Gross 133 HP
ISO 9249 / SAE J1349 - Net 131 HP
Hydraulic fan at maximum speed - Net 122 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. 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

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. 

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
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 ring with triple labyrinth seal design.

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

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* 2.4 m

*As measured by track marks on the ground at pivot turn.

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* 94 in

*As measured by track marks on the ground at pivot turn.

Undercarriage
Suspension Rigid type
Track roller frame Monocoque, large section, durable construction
Rollers and idlers Lubricated track rollers
Sealed & lubricated track Track tension easily adjusted w/grease gun
Number of track rollers (each side) 7
Type of shoes (standard) Single grouser
Number of shoes (each side) 44
Grouser height 55 mm
Shoe width (standard) 560 mm
Ground contact area 30 750 cm²
Ground pressure
(with dozer, ROPS cab)
0.40 kgf/cm² / 39.9 kPa
Track gauge 1 790 mm
Length of track on ground 2 745 mm
Suspension Rigid type
Track roller frame Monocoque, large section, durable construction
Rollers and idlers Lubricated track rollers
Sealed & lubricated track Track tension easily adjusted w/grease gun
Number of track rollers (each side) 7
Type of shoes (standard) Single grouser
Number of shoes (each side) 44
Grouser height 2.2 in
Shoe width (standard) 22 in
Ground contact area 4,766 in²
Ground pressure
(with dozer, ROPS cab)
5.79 psi
Track gauge 5 ft. 10 in
Length of track on ground 9 ft. 0 in
Service refill capacities
Coolant 37 L
Fuel tank 270 L
Engine oil 16 L
Hydraulic tank 64 L
Final drive (each side) 5.5 L
Diesel Exhaust Fluid (DEF) tank 20.5 L
Coolant 9.8 US gal
Fuel tank 71.3 US gal
Engine oil 4.2 US gal
Hydraulic tank 17 US gal
Final drive (each side) 1.5 US gal
Diesel Exhaust Fluid (DEF) tank 5.42 US gal
Operating weight (approximate)
Tractor weight:
Including ROPS cab, U frame for Power Angle Tilt (PAT) dozer, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.
12 330 kg
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.
13 980 kg
Tractor weight:
Including ROPS cab, U frame for Power Angle Tilt (PAT) dozer, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.
27,182 lbs.
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.
30,821 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 97 ltr/min at rated engine rpm.

Relief valve setting 27.4 MPa / 280 kg/cm²
Hydraulic cylinders Double-acting, piston type
Number of cylinders: Bore
    Blade lift / 2 90 mm
    Blade tilt / 1 100 mm
    Blade angle / 2 90 mm
Hydraulic oil capacity (refill):  
    Power angle tilt dozer 64 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 26 US gpm at rated engine rpm.

Relief valve setting 3,983 psi
Hydraulic cylinders Double-acting, piston type
Number of cylinders: Bore
    Blade lift / 2 3.5 in
    Blade tilt / 1 4 in
    Blade angle / 2 3.5 in
Hydraulic oil capacity (refill):  
    Power angle tilt dozer 17 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/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
  • 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
  • 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
  • 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
Support you can count on

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