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Komatsu Dozers D39PX-23

KKomatsu Dozers D39PX-23
D39PX-23 Crawler Dozer
Fine grading. It requires a stable platform, precise and responsive hydraulics and easy to operate operator controls. The D39PX-23 scores top marks in all of those categories. The super slant nose design moves the coolers and hydraulic fan to the rear and the operator forward to create a balance that makes fine grading a snap. With its wide track, the D39PX-23 has a big, stable platform to work the blade off of, essential for fine grading. A fully hydrostatic drivetrain gives the operator incredibly quick and precise maneuverability. And new Power and Economy working modes allow the operator to adjust his machine's performance to his current job and save on fuel consumption as he's doing it. Like all Komatsu products, the D39PX-23 has the advanced hydraulics system to make the addition of a grade control system seamless and turn it from a great grading tractor to an incredibly precise and fast fine grading system.

Engine
Model Komatsu SAA4D95LE-6*
Type 4-cycle, water-cooled, direct injection
Aspiration Variable flow, turbocharged, air-to-air aftercooled
Number of cylinders 4
Bore x stroke 3.75" x 4.52" 95 mm x 115 mm
Piston displacement 199 in³ 3.26 ltr
Governor All-speed, electronic
Horsepower
SAE J1995 - Gross 107 HP 79 kW
ISO 9249 / SAE J1349 - Net 105 HP 78 kW
Rated rpm 2200 rpm
Fan drive type Hydraulic (reversible)
Lubrication system:
Method Gear pump, force lubrication
Filter Full-flow
*EPA Tier 4 Interim and EU stage 3B emissions certified
Hydrostatic transmission
Dual-path, hydrostatic transmission provides infinite speed changes up to 5.3 km/h / 8.5 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
0–3.4 km/h
0–2.5 mph
0–4.1 km/h
2nd 0–3.5 mph
0–5.6 km/h
0–4.0 mph
0–6.5 km/h
3rd 0–5.3 mph
0–8.5 km/h
0–5.3 mph
0–8.5 km/h
Travel speed (variable mode) Forward Reverse
0–5.3 mph
0–8.5 km/h
0–5.3 mph
0–8.5 km/h
*Quick shift speeds are adjustable in the monitor.
FINAL DRIVE
In-shoe mounted axial piston type travel motors with integrated two stage planetary gear reduction. Compact in-shoe mount reduces risk of damaged by debris. Bolt-on sprocket ring.
STEERING SYSTEM
Palm Command Control System (PCCS) joystick control for all directional movements. Pushing the joystick forward results in forward machine travel, while pulling it rearward 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* 94" 2.4 m
*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 and lubricated track Track tension is easily adjusted with grease gun.
Number of track rollers (each side) 6
Type of shoes (standard) Single grouser
Number of shoes (each side) 39
Grouser height 2.1" 53 mm
Shoe width (standard) 25" 635 mm
Ground contact area 4,616 in² 29782 cm²
Ground pressure
(with dozer, ROPS cab)
4.70 psi 0.33 kgf/cm² / 31.7 kPa
Track gauge 5'11" 1810
Length of track on ground 7'8" 2345 mm
SERVICE REFILL CAPACITIES
Coolant 9.0 U.S. gal 34 ltr
Fuel tank 50.2 U.S. gal 190 ltr
Engine oil 2.9 U.S. gal 11 ltr
Hydraulic tank 15.8 U.S. gal 60 ltr
Final drive (each side) 0.9 U.S. gal 3.5 ltr
Operating Weight (approximate)
Tractor weight: Including ROPS cab, U frame for power angle tilt dozer, rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment.
ROPS cab 18,982 lb 8610 kg
Operating weight: Including Power Angle Tilt dozer, ROPS cab, operator, standard equipment, rated capacity of lubricant, hydraulic control unit, coolant, and full fuel tank.
ROPS cab 21,675 lb 9830 kg
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 99 ltr/min 26 U.S. gal/min at rated engine rpm.
Relief valve setting 3,974 psi 27.4 MPa / 280 kg/cm²
Hydraulic cylinders Double-acting, piston type
Number of cylinders: Bore Bore
Blade lift / 2 3" 75 mm
Blade tilt / 1 3.5" 90 mm
Blade angle / 2 3.1" 80 mm
Blade pitch 1 adjustable linkage
Hydraulic oil capacity (refilling):
Power angle tilt dozer 15.9 U.S. gal 60 ltr
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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