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Small dozer

D51EXi-24

  • Horsepower 98 kW @ 2 200 rpm 131 HP @ 2,200 rpm
  • Operating weight 13 780 kg 30,380 lbs.
  • Blade capacity 2.68 m³ 3.50 yd³

Unrivaled versatility

If you need the “Swiss Army knife” of dozers that can adapt easily to multiple situations — from golf course construction to highway projects — this dozer is it. Built for precise, high-speed grading, its standard parallel link undercarriage system has rotating bushings, which help reduce undercarriage wear, especially while traveling in reverse at high speeds. And the new Tier 4 Final engine and electronically controlled hydrostatic transmission help keep fuel use remarkably low for a dozer this powerful.

  • Get new operators up to speed quickly
  • Go from mass ex to finished grading faster than ever
  • Fully integrate 3D design data into your machines
  • Empower operators to work efficiently, pass after pass

Features and benefits

Learns as it works

With proactive dozing control, even your less experienced operators can automatically cut/strip from existing terrain. The dozer measures the terrain it tracks over and uses that data to plan the next pass. Can improve productivity by up to 60% versus previous generation.

Spreads fill material automatically

Lift layer control automatically lets your operators spread fill from existing terrain with the press of a button. The dozer measures the terrain it tracks over and uses the data it gathers to plan the next pass. Attain up to double your production and achieve consistent layers for compaction quality.

Levels material even during rough dozing

Tilt steering control automatically tilts the blade to maintain straight travel during rough dozing. Reduces operator steering input by up to 80%.

Quick surface creation

Operators can create a temporary design surface with the press of a button. Combined with other iMC 2.0 functions, your crew can begin stripping or spreading using automated input while waiting for the finish grade model.

Close the operator skill gap

Machine logic allows the dozer to continuously learn the terrain and make calculated decisions for the next pass. Intelligent Machine Control helps lessen the skill gap between new and experienced operators.

Advanced machine control

In select situations — auto stripping, rough dozing, spreading, advanced finish grading — operators can opt for nearly 100% machine control auto usage. They can even apply automatic control without having a 3D model.

A machine that learns from the operator

Automatic functions give the dozer the ability to learn from operator's blade input, resulting in more adaptability, easier operation and less reliance on operator input.

Outstanding blade response for finish grading

To deliver unparalleled grading performance, iMC enables the dozer to look ahead at grade transitions and alter the blade angle accordingly.

Specifications for D51EXi-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.
12 110 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.
13 780 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.
26,698 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.
30,380 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 U.S. gal/min at rated engine rpm.

Relief valve setting 3,974 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
  • intelligent Machine Control 2.0
  • Komatsu Diesel Oxidation Catalyst (KDOC)
  • KOMTRAX Level 5.0
  • Large high-resolution LCD
  • LED worklights
  • Lunch box holder
  • Marks and plates, English
  • New 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
    D51EXi-24: 560 mm single grouser shoe
    D51PXi-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
  • intelligent Machine Control 2.0
  • Komatsu Diesel Oxidation Catalyst (KDOC)
  • KOMTRAX Level 5.0
  • Large high-resolution LCD
  • LED worklights
  • Lunch box holder
  • Marks and plates, English
  • New 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
    D51EXi-24: 22" single grouser shoe
    D51PXi-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

Technology that works as hard as you do

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