• 60,960 lbs Operating Weight
  • 264 @1900 rpm Horsepower
  • 7.7 yd³ Blade Capacity


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.


Comfortable Ride with New Cab Damper Mounting

D85’s cab mounts use a newly designed cab damper which provides excellent shock and vibration absorption capacity with its long stroke. Cab damper mounts soften shocks and vibration while traveling over adverse conditions, which conventional mounting systems are unable to absorb. The cab damper spring isolates the cab from the machine body, suppressing vibration and providing a quiet, comfortable operating environment.

Full-adjustable Suspension Seat and Travel Control Console

The travel control console has adjustment fore and aft, and height.

For improved rear visibility during reverse operations, the operator can adjust seat 15° to the right.

Hydraulic Drive Radiator Cooling Fan

Fan speed is automatically controlled depending on coolant and hydraulic oil temperature. This saves fuel and provides great productivity with a quiet operating environment.

Hydrostatic Steering System—Smooth, Powerful Turning

The Hydrostatic Steering System (HSS) is powered by an independent hydraulic pump with engine power transmitted to both tracks without power interruption on the inside track. When the machine turns, the outside track moves faster and the inside slower, for smooth, powerful turns. Counter-rotation is available for minimum turning radius providing excellent maneuverability. Shock-free steering reduces machine vibration and minimizes operator fatigue.

Modular Power Train Design

Power train components are sealed in a modular design that allows the components to be dismounted and mounted without oil spillage.



Coolant and Lubricant Capacity (refill)

Fuel tank129 U.S. gal490 ltr
Coolant15.3 U.S. gal58 ltr
Engine10.0 U.S. gal38 ltr
Torque converter, transmission, bevel gear, and steering system15.9 U.S. gal60 ltr
Final drive (each side)6.9 U.S. gal26 ltr


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.

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.

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

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

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 radius7'4"2.24 m

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:
1st2.1 mph
3.3 km/h
2.7 mph
4.4 km/h
2nd3.7 mph
6.0 km/h
4.9 mph
7.9 km/h
3rd6.2 mph
10.0 km/h
7.9 mph
12.7 km/h


SuspensionOscillating equalizer bar and pivot shaft
Track roller frameMonocoque, large section, durable construction
Rollers and idlersLubricated track rollers
Track shoesLubricated 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 height2.8"72 mm
Shoe width (standard)36"910 mm
Ground contact area9,820 in²63340 cm²
Ground pressure
(with dozer, cab and ROPS)
6.3 psi0.44 kg/cm² / 43.1 kPa
Track gauge7'5"2250 mm
Length of track on ground11'5"3480 mm


  • Air cleaner, double element with dust indicator
  • Alternator, 75 ampere/24V
  • Back up alarm
  • Batteries 200Ah/2 x 12V
  • Cup holder
  • Decelerator pedal
  • Engine Intake precleaner
  • Final drive case wear guard
  • Head rest
  • Hinged front mask, perforated
  • High mount foot rests
  • Hydraulic-driven reversible cooling fan
  • Front pull hook
  • Lunch box holder
  • Hydrostatic Steering System (HSS)
  • Lighting system (includes 2 front, 2 rear)
  • Locks, filler caps and covers
  • Muffler with rain cap
  • Palm lever steering control
  • Pressure test ports for powertrain
  • Radiator reserve tank
  • Rear view mirror
  • Segmented sprockets
  • Shoes:
    -- 910 mm / 36" single grouser (PX)
  • Seatbelt, 76 mm / 3" wide
  • Starting motor 11kW/24V
  • Suspension seat (reclining, turn, fabric material, high back)
  • Track roller guards, full length
  • Engine hood
  • Gull wing engine side covers
  • Rear cover
  • Water separator
  • Electronic instrument monitor panel                               


  • Air conditioner
  • Engine protection equipment
  • Heater and defroster
  • Light for ripper point
  • Lights for cab, additional
  • Suspension seat, (reclining, turn, vinyl material, high back)
  • Rear counterweight, 650 kg / 1,430 lb
  • Radio, AM/FM
  • Drawbar, long type
  • Drawbar, swing type
  • Shoes:
    (Swamp Shoes) - 910 mm / 36'