Komatsu D51EXi-24 SMALL DOZERS
Product Feature
Cab Top GNSS Antenna
No blade mounted GNSS antenna(s), cables to worry about damaging with cab top GNSS antenna. Reduced risk of theft due to low visibility as viewed from ground level.
High Capacity High WearResistant HST Dozer Blade
The D51PXi PAT high-capacity (4.4 yd3), high wear-resistant blade can increase production.
Production increased by up to 15%
HST with Electronic Control
The D51i-24 is equipped with Komatsu-designed HST that allows for Quick-Shift or variable speed selection. The HST consists of dual-path closed-circuits, with two variable displacement piston pumps and two variable displacement travel motors. Hydrostatic steering eliminates steering clutches and brakes, providing smooth, powerful turns. Fully electronic control provides complete automatic shifting and enables smooth control. Engine speed is controlled using an electronic fuel control dial.
Komatsu New Emission Regulations compliant Engine
SAA4D107E-3 EPA Tier 4 Final emissions certified engine has a water cooled variable geometry turbocharged and aftercooled 4.5 liter diesel engine which provides up to 13% increased fuel efficiency.
Parallel Link Undercarriage System (PLUS)
Komatsu's PLUS rotating bush design provides less downtime, longer wear, and with up to 40% lower undercarriage maintenance costs, than conventional undercarriage. Rotating bushings eliminate the cost and downtime for bushing turns, and strengthened rollers and links increase wear life up to two times. With PLUS, individual links can be replaced with common track tools.
PAT Dozer with Adjustable Pitch
A high wear-resistant power angle, power tilt dozer blade with adjustable blade pitch is available on the D51i-24. The hydraulic blade tilt and angling function expands versatility and productivity in a variety of applications.
Stroke Sensing Hydraulic Cylinders
Robust stroke sensing hydraulic cylinders employ proven Komatsu sensor technologies for accurate finish grade performance. Stroke sensing angle cylinder allows machine control system to know the angle of the blade.
Swing up fan
The D51i-24 utilizes a swing-up fan with a gas strut-assisted lift system to provide easy access to the (side-by-side) radiator, oil cooler and charge air cooler. The hydraulic fan is reversible to help keep the radiator cores clean and simplify maintenance.
Unrivaled Blade Visibility
The D51i-24 incorporates Komatsu's superslant nose design. Komatsu's innovative design provides excellent blade visibility for improved machine control and increased efficiency and productivity.
Engine
| Model | Komatsu SAA4D107E-7* | |
| Type | 4-cycle, water-cooled, direct injection | |
| Aspiration | Variable geometry, turbocharged, air-to-air aftercooled | |
| Number of cylinders | 4 | |
| Bore x stroke | 107 mm x 124 mm | 4.21" x 4.88" |
| Piston displacement | 4.5 ltr | 275 in³ |
| Governor | All-speed, electronic | |
| Horsepower: | ||
| SAE J1995 - Gross | 99 kW | 133 HP |
| ISO 9249 / SAE J1349 - Net | 98 kW | 131 HP |
| Hydraulic fan at maximum speed - Net | 91 kW | 122 HP |
| Rated rpm |
2200 rpm |
|
| Fan drive type | Hydraulic | |
| Lubrication system: | ||
| Method | Gear pump, force lubrication | |
| Filter | Full-flow |
*EPA Tier 4 Final emissions certified
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.
Product Parameter
| Model | Komatsu SAA4D107E-7* | |
| Type | 4-cycle, water-cooled, direct injection | |
| Aspiration | Variable geometry, turbocharged, air-to-air aftercooled | |
| Number of cylinders | 4 | |
| Bore x stroke | 107 mm x 124 mm | 4.21" x 4.88" |
| Piston displacement | 4.5 ltr | 275 in³ |
| Governor | All-speed, electronic | |
| Horsepower: | ||
| SAE J1995 - Gross | 99 kW | 133 HP |
| ISO 9249 / SAE J1349 - Net | 98 kW | 131 HP |
| Hydraulic fan at maximum speed - Net | 91 kW | 122 HP |
| Rated rpm |
2200 rpm |
|
| Fan drive type | Hydraulic | |
| Lubrication system: | ||
| Method | Gear pump, force lubrication | |
| Filter | Full-flow |
|
Relief valve setting |
27.4 MPa / 280 kg/cm² | 3,974 psi |
| Hydraulic cylinders | Double-acting, piston type | |
| Number of cylinders: | Bore | Bore |
| Blade lift / 2 | 90 mm | 3.5" |
| Blade tilt / 1 | 100 mm | 4" |
| Blade angle / 2 | 90 mm | 3.5" |
| Hydraulic oil capacity (refilling): | ||
| Power angle tilt dozer | 64 ltr | 17 U.S. 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 |
| Travel speed (quick shift mode)* |
Forward | Reverse |
| 1st | 0–3.4 km/h 0–2.1 mph |
0–4.1 km/h 0–2.5 mph |
| 2nd | 0–5.6 km/h 0–3.5 mph |
0–6.5 km/h 0–4.0 mph |
| 3rd | 0–9.0 km/h 0–5.6 mph |
0–9.0 km/h 0–5.6 mph |
| Travel speed (variable mode) |
Forward | Reverse |
| 0–9.0 km/h 0–5.6 mph |
0–9.0 km/h 0–5.6 mph |
| 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. |
| D51EX-24 |
12110 kg 26,698 lb |
| 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. |
| D51EX-24 |
13780 kg 30,380 lb |
| Coolant | 37 ltr | 9.8 U.S. gal |
| Fuel tank | 270 ltr | 71.3 U.S. gal |
| Engine oil | 16 ltr | 4.2 U.S. gal |
| Hydraulic tank | 64 ltr | 17 U.S. gal |
| Final drive (each side) | 5.5ltr | 1.5 U.S. gal |
| Diesel Exhaust Fluid (DEF) tank | 20.5 ltr | 5.42 U.S. gal |
| Minimum turning radius* |
2.4 m |
94" |
| 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 grouse | |
| Number of shoes (each side) | 44 | |
| Grouser height | 55 mm | 2.2" |
| Shoe width (standard) | 560 mm | 22" |
| Ground contact area | 30750 cm² | 4,766 in² |
| Ground pressure (with dozer, ROPS cab) |
0.40 kgf/cm² / 39.4 kPa | 5.71 psi |
| Track gauge | 1790 mm | 5'10" |
| Length of track on ground |
2745 mm | 9'0" |
