Crawler bulldozer D51EXi-24

trackedoutdoorfor construction

Overview If you need the Swiss Army knife of dozers adaptable to multiple jobs — from golf course shaping to highway grading — the Komatsu D51EXi-24 delivers precise, high-speed grading with reduced undercarriage wear. Its parallel link undercarriage with rotating bushings and Tier 4 Final engine combined with an electronically controlled hydrostatic transmission optimize fuel efficiency for this power class.

Key capabilities

• Designed for precise, high-speed grading with reduced undercarriage wear
• Tier 4 Final engine paired with electronic hydrostatic transmission for efficient fuel use
• Compatible with Komatsu Intelligent Machine Control (IMC) 2.0 for advanced automation

Highlights

• Fast ramp-up for new operators with automated assist functions
• Switch quickly between mass excavation and finish grading
• Full 3D design data integration into onboard systems
• Consistent, repeatable passes to improve productivity

Features and benefits

• Learns as it works — Proactive dozing control measures terrain during passes and uses that data to plan subsequent passes, improving productivity versus prior generations.
• Spreads fill material automatically — Lift layer control enables automatic spreading from existing terrain to achieve consistent layers for compaction quality and higher production.
• Levels material even during rough dozing — Tilt steering control automatically tilts the blade to maintain straight travel during rough dozing and reduces steering input.
• Quick surface creation — Operators can create a temporary design surface with a button press to begin automated stripping or spreading while waiting for final grade models.
• Advanced machine control — In select situations (auto stripping, rough dozing, spreading, finish grading) operators can use nearly 100% automatic machine control, even without a 3D model.
• Close the operator skill gap — Machine logic continuously learns terrain and operator blade input to lessen the difference between new and experienced operators.
• Outstanding blade response for finish grading — IMC helps the dozer anticipate grade transitions and adjust blade angle for superior grading performance.

Resources

• Factory brochure and technical documentation available for this model (product brochure available as PDF).

Technical specifications

• Engine model: Komatsu SAA4D107E-3
• Engine type: 4-cycle, water-cooled, direct injection; variable geometry turbocharged, air-to-air aftercooled
• Number of cylinders: 4
• Bore x stroke: 107 x 124 mm (4.21 x 4.88 in)
• Piston displacement: 4.5 L (275 in³)
• Rated speed: 2,200 rpm
• Horsepower: 131 HP @ 2,200 rpm (ISO 9249 / SAE J1349 net); SAEJ1995 gross: 133 HP (99 kW); ISO/SAE gross: 98 kW
• Hydraulic fan at maximum speed: 122 HP (91 kW)
• Operating weight: 13,780 kg / 30,380 lbs (including PAT dozer, ROPS cab, operator, full fluids and standard equipment)
• Tractor weight: 12,110 kg / 26,698 lbs (including ROPS cab, U frame for PAT dozer, operator and standard equipment)
• Blade capacity: 2.68 m³ / 3.5 yd³
• Undercarriage suspension: Rigid type; track roller frame monocoque, large section
• Rollers and idlers: Lubricated track rollers; self-adjusting roller
• Type of shoes (standard): Single grouser; shoe width (standard): 560 mm / 22 in
• Number of track rollers (each side): 7; Number of shoes (each side): 44
• Grouser height: 55 mm / 2.2 in
• Ground contact area: 30,750 cm² / 33.1 ft²
• Ground pressure (with standard shoe): 39.9 kPa / 0.40 kg/cm² / 5.79 psi
• Track gauge: 1,790 mm / 5 ft. 10 in; Length of track on ground: 2,745 mm / 9 ft. 0 in
• Final drive: In-shoe mounted axial-piston travel motors with integrated two-stage planetary reduction; bolt-on sprocket ring with triple labyrinth seal
• Hydrostatic transmission: Dual-path HST providing infinite speed changes up to 5.6 mph; variable capacity travel motors; quick-shift speeds adjustable in monitor
• Travel speed (quick shift mode): 1st forward 0–3.4 km/h (0–2.1 mph); 1st reverse 0–4.1 km/h (0–2.5 mph); 2nd forward 0–5.6 km/h (0–3.5 mph); 2nd reverse 0–6.5 km/h (0–4.0 mph); 3rd forward 0–9.0 km/h (0–5.6 mph); 3rd reverse 0–9.0 km/h (0–5.6 mph)
• Steering: Palm Command Control System (PCCS) joystick; hydrostatic transmission provides smooth turns; minimum turning radius (pivot turn) ~2.4 m / 94 in
• Hydraulic system: Closed-Center Load Sensing System (CLSS) for precise, responsive control; piston-type hydraulic pump with discharge flow ~97 L/min (26 US gal/min); relief valve setting 280 kg/cm² (27.4 MPa / 3,974 psi)
• Hydraulic control: 3-spool control valve for Power Angle Tilt (PAT) dozer
• Hydraulic oil (refill) — Power angle tilt dozer: 64 L / 17 US gal; Hydraulic tank: 64 L / 17 US gal
• Service refill capacities: Fuel tank 270 L / 71.3 US gal; DEF tank 20.5 L / 5.4 US gal; Coolant 37 L / 9.8 US gal; Engine oil 16 L / 4.2 US gal; Final drive 5.5 L / 1.5 US gal
• Operator environment: ROPS cab meeting ISO 3471 / SAE J/ISO 3471 and ISO 3449 FOPS standards; air-suspension heated fabric seat; large high-resolution LCD monitor; New Operator Identification System
• Standard equipment highlights: Intelligent Machine Control 2.0, Komatsu Diesel Oxidation Catalyst (KDOC), Selective Catalytic Reduction (SCR), KOMTRAX Level 5.0, LED worklights, palm joystick controls with Electric Proportional Control (EPC)