Crawler bulldozer D51EX-24

trackedfor construction

Overview
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 operators excellent blade visibility during work.

• Production increased by up to 15% over prior model
• Up to 13% reduced fuel consumption over prior model

Key specifications (summary)

• Horsepower: 131 HP @ 2,200 rpm (ISO 9249 / SAE J1349 net) — 98 kW @ 2,200 rpm (gross/net references available)
• Operating weight: 13,699 kg (30,203 lbs)
• Tractor weight (approx.): 12,330 kg (27,182 lbs)
• Blade capacity: 2.7 m3 (3.5 yd3)

Features and benefits

• Parallel Link Undercarriage System (PLUS) — Designed to wear evenly for near 100% usage of undercarriage components; can lower undercarriage maintenance costs by up to 40% versus a conventional undercarriage. Strengthened rollers and links increase wear life up to two times.
• PAT dozer with adjustable pitch — Power angle tilt (PAT) blade with adjustable blade pitch for expanded productivity and versatility across applications.
• Exceptional blade visibility — 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 automatic shifting and smooth control. Komatsu-designed hydrostatic transmission (HST) allows Quick-Shift or variable speed selection.
• Easy-access maintenance features — Swing-up fan with gas strut-assisted lift for easy access to radiator, oil cooler and charge air cooler; hydraulic reversing fan for cleaning restricted airflow.
• Palm Command Control System (PCCS) — Ergonomic, low-effort joystick (PCCS) controls directional movement, travel speed and counter-rotation. Palm-operated controls for travel and blade functions increase operator comfort and ease of use.

Available resources
Brochure available for the D51 series and additional resources (comparative tool, press release) and parts ordering documentation available from product resources.

Technical specifications

• Engine: Komatsu SAA4D107E-3. 4-cycle, water-cooled, direct injection. Variable geometry turbocharged, air-to-air aftercooled (cooled EGR). Number of cylinders: 4.
• Bore x stroke: 107 x 124 mm (4.21 x 4.88 in). Piston displacement: 4.5 L (275 in3).
• Horsepower: SAE J1995 gross 99 kW (133 HP) gross; ISO 9249 / SAE J1349 net 98 kW / 131 HP. Rated engine speed: 2,200 rpm.
• Fan drive type: Hydraulic; hydraulic fan at maximum speed net: 91 kW (122 HP) equivalent.
• Lubrication: Full-flow filter; gear pump, force lubrication.
• Undercarriage: Rigid suspension; monocoque large-section track roller frame; lubricated track rollers; standard shoe: single grouser. Number of track rollers (each side): 7. Number of shoes (each side): 44. Grouser height: 55 mm (2.2 in). Shoe width (standard): 560 mm (22 in). Ground contact area: 30,750 cm2 (33.1 ft2). Ground pressure (standard shoe ISO 16754): 0.40 kg/cm2 (39.9 kPa / 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 gear reduction; compact in-shoe mount to reduce debris damage; bolt-on sprocket ring with triple labyrinth seal design.
• Hydrostatic transmission (HST): Dual-path HST with infinite speed changes up to 9.0 kph (5.6 mph) in variable mode. Quick-shift travel speeds adjustable in monitor. Travel speed (quick shift mode) — 1st forward: 0–3.4 kph (0–2.1 mph); 2nd forward: 0–5.6 kph (0–3.5 mph); 3rd forward: 0–9.0 kph (0–5.6 mph). Comparable reverse speeds apply.
• Hydraulic system: Closed-Center Load Sensing System (CLSS) for precise responsive control and efficient simultaneous operation. Hydraulic pump capacity (discharge flow): 97 L/min (26 US gal/min) at rated engine rpm. Relief valve setting: 280 kg/cm2 (27.4 MPa / 3,974 psi). Control valve: 3-spool control valve for power angle tilt dozer. Blade positions: lift (raise/hold/lower/float), tilt (right/hold/left), angle (right/hold/left). Hydraulic cylinders: Double-acting, piston type.
• Operator / weights: Operating weight (including PAT dozer, ROPS cab, operator, standard equipment, full fuel): 13,699 kg (30,203 lbs). Tractor weight (including ROPS cab and standard equipment): 12,330 kg (27,182 lbs).
• Blade: Power Angle Tilt (PAT) dozer blade with adjustable pitch; blade tilt/angle/lift travel values: blade tilt approx. 100 mm (4 in) / blade lift approx. 90 mm (3.5 in) depending on measurement point.
• Service refill capacities: Fuel tank: 270 L (71.3 US gal). Diesel Exhaust Fluid (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 refill: 5.5 L (1.5 US gal). Hydraulic tank (refill): 64 L (17 US gal).
• Steering system: Palm Command Control System (PCCS) joystick; HST provides smooth, powerful turns. Minimum turning radius (pivot-turn track marks): 2.4 m (94 in) as measured by track marks.
• Other notes / equipment: ROPS Cab meets ISO 3471 / SAE J/ISO 3471 and FOPS ISO 3449 standards; optional multi-shank ripper available (specs for optional multi-shank ripper: weight ~860 kg / 1,874 lb; beam length ~1,556 mm / 5'1"; maximum lift above ground ~380 mm / 1'3"; maximum digging depth ~425 mm / 1'8"; number of shanks: 3).