From golf course construction to highway projects, the D51PX-24 is an all-around crawler dozer built for precise, high-speed grading. The PX model has a high-capacity, high-wear resistant dozer blade.
| 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
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 |
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.
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* | 2.6 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* | 102 in |
*As measured by track marks on the ground at pivot turn.
| 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) | 710 mm |
| Ground contact area | 38 980 cm² |
| Ground pressure (with dozer, ROPS cab) |
0.32 kgf/cm² / 32.1 kPa |
| Track gauge | 1 880 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) | 28 in |
| Ground contact area | 6,042 in² |
| Ground pressure (with dozer, ROPS cab) |
4.66 psi |
| Track gauge | 6 ft. 2 in |
| Length of track on ground | 9 ft. 0 in |
| 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 |
| 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. |
12 550 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. |
14 260 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. |
27,668 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. |
31,438 lbs. |
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 | 3,983 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 |
