• 63,800 lbs Operating Weight
  • 264 @1900 rpm Horsepower
  • 7.7 yd¬≥ Blade Capacity


The new D85PX-18 with a powerful 11 liter Tier 4 Final emission engine and automatic shift transmission has class leading track-on-ground for superior floatation when working in soft ground conditions. Well balanced and designed for superb visibility, the operator will be comfortable and productive for many hours while seated in the roomy and quiet cab equipped with an air suspension seat, bright color monitor and rear view camera.

D85EX-18 Walkaround  >


Battery Disconnect Switch

A standard battery disconnect switch allows a technician to disconnect the power supply before servicing the machine.

Comfortable Ride with New Operator Seat and Cab Damper Mounting

The new operator seat is equipped with lumbar support, a tilting adjust function and electric heater. It is easy to adjust to the operator's shape and various working conditions and provides comfortable operation. The standard heated seat makes it possible to work comfortably in the winter.

Easy Access DEF Tank

Located at the right side of the fuel tank, and is accessible from ground level. A convenient sight gauge is also provided.

Heavy-duty aftertreatment system

This new system combines a Komatsu Diesel Particulate Filter (KDPF) and Selective Catalytic Reduction (SCR). The SCR NOx reduction system injects the correct amount of DEF at the proper rate, thereby transforming NOx into non-toxic water (H2O) and nitrogen gas (N2).

Integrated ROPS Cab

The D85EX/PX-18 has a strong integrated ROPS cab. High rigidity and superb sealing sharply reduce noise and vibration for the operator and minimizes dust that enters the cab. This provides the operator a comfortable working environment. Also, there is more side visibility because an additional external ROPS structure and posts are not required.

Komatsu Auto Idle Shutdown

Komatsu auto idle shutdown automatically shuts the engine down after idling temporarily to reduce unnecessary fuel consumption and exhaust emissions. The amount of time before the engine is shutdown can be easily programmed from 5 to 60 minutes.

Komatsu Variable Geometry Turbocharger (KVGT) system

The KVGT system features proven Komatsu design hydraulic technology for variable control of air-flow and supplies optimal air according to load conditions. The upgraded version provides better exhaust temperature management.

New Fuel Efficient Bulldozer

The new D85EX/PX-18 is both productive and fuel efficient with the SIGMADOZER® blade, automatic transmission and new Tier 4 Final engine. The SIGMADOZER® blade, based on completely new digging theory, dramatically increases production. This bulldozer significantly improves fuel efficiency compared to a conventional model.

New Tier 4 Final Engine

The Komatsu SAA6D125E-7 engine is EPA Tier 4 Final emissions certified and provides exceptional performance while reducing fuel consumption. Based on Komatsu proprietary technologies developed over many years, this new diesel engine lowers nitrogen oxides (NOx) and particulate matter (PM) by more than 90%, compared to Tier 3 levels. Through the in-house development and production of engines, electronics, and hydraulic components, Komatsu has achieved great advancements in technology, providing high levels of performance and efficiency in virtually all conditions.

Rear View Monitoring System

The operator can view directly behind the machine on the color monitor panel.



Komatsu SAA6D125E-7*
4-cycle, water-cooled, direct injection
Komatsu variable geometry turbocharged, air-to-air aftercooled
No. of cylinders
Bore x stroke 125 mm x 150 mm 4.49" x 5.69"
Piston displacement 11.04 ltr 674 in³
All-speed and mid-range, electronic

SAE J1995 / Gross 199 kW 267 HP
ISO 9249 / SAE J1349* / Net 197 kW 264HP
Rated rpm
1900 rpm
Fan drive type
Lubrication system:

Gear pump, force lubrication
**EPA Tier 4 Final 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 teeth are bolt-on for easy replacement. Triple labyrinth protects seals and improves durability.

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. Piston type hydraulic pump with capacity (discharge flow) of 331 ltr/min 87.4 U.S. gal/min at rated engine rpm.

Relief valve setting 22.6 MPa
3,270 psi
Control valves:

Spool control valves for SIGMADOZER®, semi-u tilt or straight tilt dozer

Blade lift
Raise, hold, lower, and float
Blade tilt
Right, hold, and left
Rear attachment
Raise, hold, and lower

Operating Weight

Tractor weight:

Including ROPS cab, rated capacity of lubricant, hydraulic control unit, coolant, full fuel tank, operator, and standard equipment. 25700 kg 56,660 lb
Operating weight:

Including SIGMADOZER® and fixed multi-shank ripper (EX) or straight tilt dozer and long drawbar (PX) ROPS cab, operator, standard equipment, rated capacity of lubricant, hydraulic control unit, coolant, and full fuel tank. 28940 kg 63,800 lb

Service Refill Capacities

Fuel tank 470 ltr 124.1 U.S. gal
DEF tank 23.5 ltr 6.2 U.S. gal
Coolant 65 ltr 17.2 U.S. gal
Engine 38 ltr 10.0 U.S. gal
Damper case
1.6 ltr 0.42 U.S. gal
Torque converter, transmission, bevel gear, and steering system 60 ltr 15.8 U.S. gal
Final drive (each side) 36 ltr 9.5 U.S. gal
Hydraulic oil capacity (refill): 69 ltr 18.2 U.S. gal
Ripper equipment (additional volume):    
Multi-shank ripper 11 ltr 2.9 U.S. gal

Steering System

Palm Command Control 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. Tilt it to the right for a right 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 2.2 m 7'3"

TORQFLOW Transmission

Komatsu TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase and a planetary gear, multipledisc clutch transmission which is electronically controlled, hydraulically actuated and force-lubricated for optimum heat dissipation. Shift lock lever and neutral safety switch.

Travel speed: Forward: Reverse:
1st 3.3 km/h
2.1 mph
4.4 km/h
2.7 mph
2nd 6.1 km/h
3.8 mph
8.0 km/h
5.0 mph
3rd L 7.8 km/h
4.8 mph
9.2 km/h
5.7 mph
3rd 10.1 km/h
6.3 mph
13.0 km/h
8.1 mph


Oscillating equalizer bar and pivot shaft
Track roller frame
Monocoque, large section, durable construction
Rollers and idlers
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)
Type of shoes (standard)
Single grouser
Number of shoes (each side)
Grouser height 72 mm 2.8"
Shoe width (standard) 910 mm 36"
Ground contact area 63340 cm² 9,820 in²
Ground pressure
(with dozer, cab and ROPS)
0.40 kg/cm²
39.8 kPa
5.77 psi
Track gauge 2250 mm 7'5"
Length of track on ground 3480 mm 11.5'


  • Air cleaner, double element with dust indicator
  • Alternator, 90 ampere/24V
  • Auto idle shutdown function
  • Backup alarm
  • Batteries, 200 Ah/2 x 12V
  • Battery disconnect switch
  • Blade lift cylinders
  • Color monitor, LCD
  • Decelerator pedal
  • Engine hood 
  • Engine intake centrifugal precleaner
  • Engine, gull-wing side covers
  • Engine shutdown secondary switch
  • Exhaust pipe with raincap
  • Fenders
  • Front pull hook
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with reverse clean mode
  • Hydraulics for front attachment
  • Hydraulics for front attachment
    --Single tilt, power pitch (EX SIGMADOZER only)

    --Single tilt, manual pitch (non-SIGMADOZER)
  • Hydraulics for rear attachment
  • KOMTRAX® Level 5
  • Komatsu Diesel Particulate Filter (KDPF)
  • Komatsu Variable Geometry Turbocharger (KVGT)
  • Locks, filler caps and covers
  • Oil pressure check ports for power train
  • Operator ID function
  • PM service connector
  • Radiator mask, heavy-duty, hinged, perorated
  • Radiator reserve tank
  • Rear cover
  • ROPS cab**
  • 75 dB operator ear noise level
  • Air conditioner
  • Cab accessories
    --12V power supply (2 ports)
    --Cup holder

    --Rearview mirror
    --Rear view monitoring (1 camera)

    --AM/FM Radio w/remote AUX plug (3.5 mm)
  • Work lights
    --2 front, hood mounted

    2 front, cab mounted
    1 rear, left fender mounted
    --2 rear, cab mounted

    --1 ripper point (EX only)
  • Seat, air suspension, fabric, heated low back, rotates 12.5° to right, headrest
  • Seat belt, 76 mm 3", retractable
  • Seat belt indicator
  • Sealed electrical connectors
  • Starting motor, 11.0 kW/24V
  • Steering system: Hydrostatic Steering System (HSS)
  • Torque converter
  • Track roller guards, center and end sections
  • Track shoe assembly
  • Heavy-Duty sealed and lubricated track
  • 910 mm 36" MODERATE service single grouser shoe (PX)
  • Transmission with auto/manual shift modes
  • Underguards, heavy duty
  • Hinged belly pan
  • Transmission
  • Water separator
  • Wide core cooling package

* Dozer assembly and rear mounted equipment are not included in base machine standard equipment
** Cab meets OSHA/MSHA ROPS and FOPS Level 2 standards (ROPS standards ISO 3471, SAE J/ISO 3471; FOPS standards ISO 3449


  • Drawbar, long type
  • Hitch
  • Straight Tilt (PX)
  • Straight tilt frame for use with allied blades
  • Trunnions for use with allied dozer assembly
  • Track roller guard, full length