Komatsu D85PX-15

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The low ground pressure D85PX-15 has the ability to work in underfoot conditions that most big dozers would shy away from. Couple that stability with hydrostatic steering, very precise hydraulic control and a grade system and you’ve got an incredible production tractor or very large grading tractor.


Model   Komatsu SAA6D125E-5
Type   4-cycle, water-cooled, direct injection
Aspiration   Turbocharged, air-to-air aftercooled, cooled EGR
No. of cylinders   6
Bore x stroke 4.92" x 5.9" 125 mm x 150 mm
Piston displacement 674 in³ 11.04 ltr
Governor   All-speed, electronic
SAE J1995 266 HP 199 kW
ISO 9249 / SAE J1349* 240HP 179 kW
Hydraulic fan at maximum speed / Net 240 HP 179 kW
Rated rpm   1900 rpm
Fan drive type   Hydraulic
Lubrication system:    
Method   Gear pump, force lubrication
Filter   Full-flow
EPA Tier 3 and EU stage 3A emissions certified.    
TORQFLOW Transmission    
Komatsu TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase, torque converter and a planetary gear, multiple-disc clutch transmission which is hydraulically-actuated and force-lubricated for optimum heat dissipation. Gearshift lock lever and neutral switch helps prevent accidental starts.    
Travel speed: Forward: Reverse:
1st 2.1 mph  
3.3 km/h 2.7 mph  
4.4 km/h    
2nd 3.7 mph  
6.0 km/h 4.9 mph  
7.9 km/h    
3rd 6.2 mph  
10.0 km/h 7.9 mph  
12.7 km/h    
Final Drive    
Double-reduction final drive of spur and planetary gear sets to increase tractive effort and reduce gear tooth stresses for long final drive life. Segmented sprocket rims are bolt-on for easy replacement.    
Steering System    
PCCS lever controls for all directional movements. Pushing the PCCS lever forward results in forward machine travel, while pulling it rearward reverses the machine. Simply tilt the PCCS lever to left to make a left turn.    
Hydrostatic Steering System (HSS) is powered by steering planetary units and an independent hydraulic pump and motor. Counterrotation turns are also available. Wet, multiple-disc, pedal-controlled service brakes are spring-actuated and hydraulically released. Gear shift lock lever also applies parking brake.    
Minimum turning radius 7'4" 2.24 m
Suspension   Oscillating equalizer bar and pivot shaft
Track roller frame   Monocoque, large section, durable construction
Rollers and idlers   Lubricated track rollers
Track shoes   Lubricated tracks. Unique seals prevent entry of foreign abrasive material into pin to bushing clearances to provide extended service life. Track tension is easily adjusted with grease gun.
Number of track rollers (each side)   8
Type of shoes (standard)   Single grouser
Number of shoes (each side)   45
Grouser height 2.8" 72 mm
Shoe width (standard) 36" 910 mm
Ground contact area 9,820 in² 63340 cm²
Ground pressure    
(with dozer, cab and ROPS) 6.3 psi 0.44 kg/cm² / 43.1 kPa
Track gauge 7'5" 2250 mm
Length of track on ground 11'5" 3480 mm
Coolant and Lubricant Capacity (refill)    
Fuel tank 129 U.S. gal 490 ltr
Coolant 15.3 U.S. gal 58 ltr
Engine 10.0 U.S. gal 38 ltr
Torque converter, transmission, bevel gear, and steering system 15.9 U.S. gal 60 ltr
Final drive (each side) 6.9 U.S. gal 26 ltr
Operating Weight    
Tractor weight:    
Including rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment. 51,810 lb 23500 kg
Operating weight:    
Including straight tilt dozer, steel cab, ROPS, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank. 60,960 lb 27650 kg
Hydraulic System    
Closed-center load sensing system (CLSS) designed for precise and responsive control, and for efficient simultaneous operation.    
Hydraulic control units:    
All spool valves externally mounted beside the hydraulic tank. Plunger type hydraulic pump with capacity (discharge flow) of 195 ltr/min 51.5 U.S. gal/min at rated engine rpm.    
Relief valve setting 3,270 psi 22.6 MPa
230 kg/cm²    
Control valves:    
Spool control valves for tilt dozer:    
Blade lift   Raise, hold, lower, and float
Blade tilt   Right, hold, and left
Hydraulic cylinders   Double-acting, piston
Number of cylinders: Bore Bore
Blade lift / 2 3.9" 100 mm
Blade tilt / 1 5.9" 150 mm
Ripper lift / 2 5.1" 130 mm
Hydraulic oil capacity (refill):    
Straight tilt dozer 17.7 U.S. gal 67 ltr
Semi-U tilt dozer 17.7 U.S. gal 67 ltr
Ripper equipment (additional volume):    
Multi-shank ripper 2.9 U.S. gal 11 ltr