Komatsu D51PX-24 SMALL DOZERS
Product Feature
High Capacity High WearResistant HST Dozer Blade
The D51PX PAT high-capacity (4.4 yd3), high wear-resistant blade can increase production.
Production increased by up to 15%
HST with Electronic Control
The D51EX/PX-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
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 D51EX/PX-24. The hydraulic blade tilt and angling function expands versatility and productivity in a variety of applications.
Swing Up Fan
The D51EX/PX-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 D51EX/PX-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-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 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.
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 26 U.S. gal/min at rated engine rpm. |
||
| Relief valve setting | 27.4 MPa / 280 kg/cm² | 3,983 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 (refill): | ||
| 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 |
Hydrostatic Transmission
Dual-path, hydrostatic transmission provides infinite speed changes up to 9.0 km/h 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.
Product Parameter
| 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 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 |
| 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 26 U.S. gal/min at rated engine rpm. |
||
| Relief valve setting | 27.4 MPa / 280 kg/cm² | 3,983 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 (refill): | ||
| 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) |
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. |
|
| D51PX-24 |
12550 kg |
27,668 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. |
|
| D51PX-24 |
14260 kg |
31,438 lb |
| Coolant | 37 ltr | 9.8 U.S. gal |
| Fuel tank | 270 ltr | 71.3 U.S. gal |
| Engine oil | 16ltr | 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: | 2.6 m |
102" |
| 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 | 2.2" |
| Shoe width (standard) | 710mm | 28" |
| Ground contact area | 38980 cm² | 6,042 in² |
| Ground pressure (with dozer, ROPS cab) |
0.32 kgf/cm² / 32.1 kPa | 4.66 psi |
| Track gauge | 1880 mm | 6'2" |
| Length of track on ground |
2745 mm | 9'0" |
