Komatsu D51PX-24 Bulldozer

Komatsu D51PX-24 Bulldozer

Rated rpm 2200 rpm
Operating Weight 14260 kg 31,438 lb
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Komatsu’s 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.

 

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.

 

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.

 

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.

 

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%

 

Rear, hydraulically-driven, 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.

 

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.

 

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

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.

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

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.

Steering

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 102" 


*As measured by track marks on the ground at pivot turn.

Undercarriage

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" 

Service Refill Capacities

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) tank20.5 ltr 5.42 U.S. gal

Operating Weight

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

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 

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