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Large dozer

D155AXi-8

  • Horsepower 264 kW @ 1 900 rpm 354 HP @ 1,900 rpm
  • Operating weight 41 100 kg 90,610 lbs.
  • Blade capacity 9.4 m³ 12.3 yd³

A workhorse for your fleet

Your big jobs demand a big dozer. 350+ horsepower, massive blade capacity with semi-U and full U blades, automatic lockup torque converter, and low drive K-bogie suspended undercarriage designed for maximum traction and smooth ride when dozing or ripping.

  • Get new operators up to speed quickly
  • Go from mass ex to finished grading faster than ever
  • Fully integrate 3D design data into your machines
  • Empower operators to work efficiently, pass after pass

Features and benefits

Close the operator skill gap

Machine logic allows the dozer to continuously learn the terrain and make calculated decisions for the next pass. Intelligent Machine Control helps lessen the skill gap between new and experienced operators.

Advanced machine control

In select situations — auto stripping, rough dozing, spreading, advanced finish grading — operators can opt for nearly 100% machine control auto usage. They can even apply automatic control without having a 3D model.

A machine that learns from the operator

Automatic functions give the dozer the ability to learn from operator's blade input, resulting in more adaptability, easier operation and less reliance on operator input.

Outstanding blade response for finish grading

To deliver unparalleled grading performance, iMC enables the dozer to look ahead at grade transitions and alter the blade angle accordingly.

Specifications for D155AXi-8

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US system Metric
Engine
Model Komatsu SAA6D140E-7**
Type 4-cycle, water-cooled, direct injection
Aspiration Komatsu Variable Geometry Turbocharged, air-to-air aftercooled, cooled EGR
Number of cylinders 6
Bore x stroke 140 x 165 mm
Piston displacement 15.24 L
Governor Mid-range, electronic
Horsepower:
SAE J1995 - Gross 268 kW
ISO 9249 / SAE J1349* - Net 264 kW
Rated rpm 1 900 rpm
Fan drive type Hydraulic
Lubrication system:
Method Gear pump, force lubrication
Filter Full-flow
*Net horsepower at the maximum speed of radiator cooling fan: 239 kW 
**EPA Tier 4 Final emissions certified
Model Komatsu SAA6D140E-7**
Type 4-cycle, water-cooled, direct injection
Aspiration Komatsu Variable Geometry Turbocharged, air-to-air aftercooled, cooled EGR
Number of cylinders 6
Bore x stroke 5.51 x 6.50 in
Piston displacement 930 in³
Governor Mid-range, electronic
Horsepower:
SAE J1995 - Gross 360 HP
ISO 9249 / SAE J1349* - Net 354 HP
Rated rpm 1,900 rpm
Fan drive type Hydraulic
Lubrication system:
Method Gear pump, force lubrication
Filter Full-flow
*Net horsepower at the maximum speed of radiator cooling fan: 320 HP
**EPA Tier 4 Final emissions certified
TORQFLOW Transmission

Komatsu's automatic TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase, torque converter with lockup clutch, and a planetary gear, multipledisc clutch transmission which is hydraulically actuated and force-lubricated for optimum heat dissipation. Equipped with gearshift lock lever and neutral safety switch.

Travel speed:
1st Gear forward 3.8 kph
1st Gear reverse 4.6 kph
2nd Gear forward 5.6 kph
2nd Gear reverse 6.8 kph
3rd L Gear forward 7.5 kph
3rd L Gear reverse 9.2 kph
3rd Gear forward 11.6 kph
3rd Gear reverse 14.0 kph

Komatsu's automatic TORQFLOW transmission consists of a water-cooled, 3-element, 1-stage, 1-phase, torque converter with lockup clutch, and a planetary gear, multipledisc clutch transmission which is hydraulically actuated and force-lubricated for optimum heat dissipation. Equipped with gearshift lock lever and neutral safety switch.

Travel speed:
1st Gear forward 2.4 mph
1st Gear reverse 2.9 mph
2nd Gear forward 3.5 mph
2nd Gear reverse 4.2 mph
3rd L Gear forward 4.7 mph
3rd L Gear reverse 5.7 mph
3rd Gear forward 7.2 mph
3rd Gear reverse 8.7 mph
Final Drives
Double-reduction, spur and planetary final drives increase tractive effort. Segmented sprockets are bolt-on for easy in-the-field replacement.
Double-reduction, spur and planetary final drives increase tractive effort. Segmented sprockets are bolt-on for easy in-the-field 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 the 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. Counter-rotation turns are also available. Wet, multiple-disc, pedal-controlled service brakes are spring-actuated and hydraulically released. Gearshift lock lever also applies parking brakes.

Minimum turning radius 2.14 m

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 7 ft. 0 in
Undercarriage

Suspension: Oscillation-type with equalizer bar and forward mounted pivot shafts

Track roller frame: Monocoque, high-tensilestrength steel construction

K-Bogie undercarriage
Lubricated track rollers are resiliently mounted the track frame with a bogie suspension system whose oscillating motion is cushioned by rubber pads.

Track shoes
Lubricated tracks. Unique dust seals for preventing entry of foreign abrasives into pin-to-bushing clearance for extended service. Track tension easily adjusted with grease gun.

Number of shoes (each side) 42
Grouser height 80 mm
Shoe width (standard/maximum) 610 mm / 710 mm
Ground contact area 39 955 cm²
Ground pressure (tractor only) 80.3 kPa / 0.82 kg/cm²
Number of track rollers (each side) 7
Number of carrier rollers (each side) 2

Suspension: Oscillation-type with equalizer bar and forward mounted pivot shafts

Track roller frame: Monocoque, high-tensilestrength steel construction

K-Bogie undercarriage
Lubricated track rollers are resiliently mounted the track frame with a bogie suspension system whose oscillating motion is cushioned by rubber pads.

Track shoes
Lubricated tracks. Unique dust seals for preventing entry of foreign abrasives into pin-to-bushing clearance for extended service. Track tension easily adjusted with grease gun.

Number of shoes (each side) 42
Grouser height 3.1 in
Shoe width (standard/maximum) 24 in / 28 in
Ground contact area 6,193 in²
Ground pressure (tractor only) 11.6 psi
Number of track rollers (each side) 7
Number of carrier rollers (each side) 2
Service Refill Capacities
Fuel tank 625 L
Coolant 104 L
Engine oil 37 L
Damper 1.5 L
Transmission, bevel gear, and steering system 90 L
Final drive (each side) 31 L
DEF tank 39 L
Hydraulic oil capacity 95 L
Fuel tank 165 US gal
Coolant 27.5 US gal
Engine oil 9.8 US gal
Damper 0.4 US gal
Transmission, bevel gear, and steering system 23.8 US gal
Final drive (each side) 8.2 US gal
DEF tank 10.3 US gal
Hydraulic oil capacity 25.1 US gal
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 beside the hydraulic tank.

Variable piston pump with capacity (discharge flow) of 325 L/min for steering and 180 L/min for implement at rated engine rpm.

Relief valve setting

- for implement 27.5 MPa 280 kg/cm2

- for steering 38.2 MPa 390 kg/cm2

Control valves:

Spool control valve for SIGMADOZER and Semi-U tilt dozer.

Positions:

  • Blade lift: Raise, hold, lower, and float
  • Blade tilt: Right, hold, and left

Additional control valve required for variable digging angle multi-shank ripper and giant ripper.

Positions:

  • Ripper lift: Raise, hold, and lower
  • Ripper tilt: Increase, hold, and decrease
  • Hydraulic cylinders: Double-acting, piston
  Number of cylinders Bore
Blade Lift 2 110 mm
Blade Tilt 1 160 mm
Ripper Lift 1 180 mm
Ripper Tilt 1 200 mm

Hydraulic oil capacity (refill):

  • SIGMADOZER: 95.0 L
  • Semi-U tilt dozer: 95.0 L

Ripper equipment (additional volume):

  • Multi-shank ripper: 37 L
  • Giant ripper: 37 L

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 beside the hydraulic tank.

Variable piston pump with capacity (discharge flow) of 85.9 US gal for steering and 47.6 US gal for implement at rated engine rpm.

Relief valve setting

- for implement 3,980 psi

- for steering 5,550 psi

Control valves:

Spool control valve for SIGMADOZER and Semi-U tilt dozer.

Positions:

  • Blade lift: Raise, hold, lower, and float
  • Blade tilt: Right, hold, and left

Additional control valve required for variable digging angle multi-shank ripper and giant ripper.

Positions:

  • Ripper lift: Raise, hold, and lower
  • Ripper tilt: Increase, hold, and decrease
  • Hydraulic cylinders: Double-acting, piston
  Number of cylinders Bore
Blade Lift 2 4.33 in
Blade Tilt 1 6.30 in
Ripper Lift 1 7.09 in
Ripper Tilt 1 7.87 in

Hydraulic oil capacity (refill):

  • SIGMADOZER: 25.1 US gal
  • Semi-U tilt dozer: 25.1 US gal

Ripper equipment (additional volume):

  • Multi-shank ripper: 9.8 US gal
  • Giant ripper: 9.8 US gal
Operating Weight

Tractor weight: 32 760 kg
Including rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment (including ROPS cab).

Operating weight: 41 100 kg
Including strengthened SIGMADOZER, giant ripper, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.

Ground pressure: 100.9 kPa 1.03 kg/cm2

Tractor weight: 72,223 lbs.
Including rated capacity of lubricant, coolant, full fuel tank, operator, and standard equipment (including ROPS cab).

Operating weight: 90,610 lbs.
Including strengthened SIGMADOZER, giant ripper, ROPS cab, operator, standard equipment, rated capacity of lubricant, coolant, and full fuel tank.

Ground pressure: 14.6 psi

  • Air cleaner, double element with dust indicator
  • Alternator, 140 ampere/24V
  • Backup alarm
  • Batteries, 200 Ah/2 x 12V
  • Battery disconnect switch
  • Blade lift cylinders with double dust seal
  • Color monitor, LCD
  • Decelerator pedal
  • Engine hood
  • Engine idle auto shutdown with adjustable timer
  • Engine intake centrifugal precleaner
  • Engine, gull-wing side covers
  • Engine shutdown secondary switch
  • Exhaust pipe with raincap
  • Fast fuel provision
  • Fenders
  • Front pull hook
  • Fuel pre-filter and primary filter
  • Grid heater starting aid in cold weather
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with manual reverse clean mode
  • Hydraulics for dual tilt and pitch dozer
  • Hydraulics for ripper VGR/MSR
  • KOMTRAX® Level 5
  • K-bogie undercarriage
  • Komatsu Diesel Particulate Filter (KDPF)
  • Komatsu Variable Geometry Turbocharger (KVGT)
  • Komatsu Selective Catalytic Reduction (SCR)
  • Locks, filler caps and covers
  • Oil pressure check ports for power train
  • PM service connector
  • Radiator mask, double door, heavy-duty, hinged, perforated
  • Radiator reserve tank
  • Rear cover
  • ROPS cab (1420 kg)**
    • Air conditioner/heater/defroster
      --Pressurized
      --Condenser remote mounted
    • Cab accessories
    • Work lights
      --2 front, hood mounted
      --2 front, cab mounted
      --2 rear, fender mounter
      --2 rear, cab mounted
      --1 rear, for ripper point
  • Seat, air suspension, fabric, heated, low back, rotates 12.5° to right, headrest
  • Seat belt, 76 mm, retractable
  • Seat belt indicator
  • Sealed electrical connectors
  • Starting motor, 11.0 kW
  • Steering system: Hydrostatic Steering System (HSS)
  • Torque converter with auto lock-up
  • Track roller guards, end sections
  • Track shoe assembly
    • Sealed and lubricated
      610 mmextreme service shoes
  • Transmission with auto/manual shift modes
  • Underguards, heavy duty
  • Hinged belly pans
  • Water separator, fuel
  • Wide core cooling package, 6 fins per inch spacing
  • Air cleaner, double element with dust indicator
  • Alternator, 140 ampere/24V
  • Backup alarm
  • Batteries, 200 Ah/2 x 12V
  • Battery disconnect switch
  • Blade lift cylinders with double dust seal
  • Color monitor, LCD
  • Decelerator pedal
  • Engine hood
  • Engine idle auto shutdown with adjustable timer
  • Engine intake centrifugal precleaner
  • Engine, gull-wing side covers
  • Engine shutdown secondary switch
  • Exhaust pipe with raincap
  • Fast fuel provision
  • Fenders
  • Front pull hook
  • Fuel pre-filter and primary filter
  • Grid heater starting aid in cold weather
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with manual reverse clean mode
  • Hydraulics for dual tilt and pitch dozer
  • Hydraulics for ripper VGR/MSR
  • KOMTRAX® Level 5
  • K-bogie undercarriage
  • Komatsu Diesel Particulate Filter (KDPF)
  • Komatsu Variable Geometry Turbocharger (KVGT)
  • Komatsu Selective Catalytic Reduction (SCR)
  • Locks, filler caps and covers
  • Oil pressure check ports for power train
  • PM service connector
  • Radiator mask, double door, heavy-duty, hinged, perforated
  • Radiator reserve tank
  • Rear cover
  • ROPS cab (3,131 lb)**
    • Air conditioner/heater/defroster
      --Pressurized
      --Condenser remote mounted
    • Cab accessories
    • Work lights
      --2 front, hood mounted
      --2 front, cab mounted
      --2 rear, fender mounter
      --2 rear, cab mounted
      --1 rear, for ripper point
  • Seat, air suspension, fabric, heated, low back, rotates 12.5° to right, headrest
  • Seat belt, 3", retractable
  • Seat belt indicator
  • Sealed electrical connectors
  • Starting motor, 24V
  • Steering system: Hydrostatic Steering System (HSS)
  • Torque converter with auto lock-up
  • Track roller guards, end sections
  • Track shoe assembly
    • Sealed and lubricated
      24" extreme service shoes
  • Transmission with auto/manual shift modes
  • Underguards, heavy duty
  • Hinged belly pans
  • Water separator, fuel
  • Wide core cooling package, 6 fins per inch spacing

Shoes, single grouser - Additional weight:

  • 26" extreme service: +240 kg
  • 28" moderate service: No additional
  • 24" PLUS extreme service: +569 kg
  • 26" PLUS extreme service: +819 kg
  • 28" PLUS extreme service: +1029 kg

Shoes, single grouser - Ground contact area:

  • 26" extreme service: 43 230 cm2
  • 28" moderate service: 46 505 cm2
  • 24" PLUS extreme service: 39 955 cm2
  • 26" PLUS extreme service: 43 230 cm2
  • 28" PLUS extreme service: 46 505 cm22

Variable Multi-Shank Ripper:

  • Additional weight (including hydraulic control unit): 3760 kg 
  • Beam length: 2320 mm 
  • Hydraulically-controlled parallelogram-type ripper with three shanks. Digging angle infinitely adjustable. Standard digging angle: 49°
  • Maximum digging depth: 900 mm
  • Maximum lift above ground: 950 mm 

Variable Giant Ripper:

  • Additional weight (including hydraulic control unit): 2440 kg 
  • Beam length: 1400 mm 
  • Hydraulically-controlled parallelogram-type ripper with one shank. Digging angle infinitely adjustable. Standard digging angle: 49°
  • Maximum digging depth: 1240 mm 
  • Maximum lift above ground: 950 mm 

Other:

  • HD Counterweight 9-plate with rigid drawbar, 3568 kg

Dozer Equipment:

  • SIGMADOZER®
  • Semi-U

Shoes, single grouser - Additional weight:

  • 26" extreme service: +530 lb
  • 28" moderate service: No additional
  • 24" PLUS extreme service: +1,254 lb
  • 26" PLUS extreme service: +1,806 lb
  • 28" PLUS extreme service: +2,269 lb

Shoes, single grouser - Ground contact area:

  • 26" extreme service: 6,700 in2
  • 28" moderate service: 7,208 in2
  • 24" PLUS extreme service: 6,193 in2
  • 26" PLUS extreme service: 6,700 in2
  • 28" PLUS extreme service: 7,208 in2

Variable Multi-Shank Ripper:

  • Additional weight (including hydraulic control unit): 8,290 lb
  • Beam length: 7'7"
  • Hydraulically-controlled parallelogram-type ripper with three shanks. Digging angle infinitely adjustable. Standard digging angle: 49°
  • Maximum digging depth: 2'11"
  • Maximum lift above ground: 3'1"

Variable Giant Ripper:

  • Additional weight (including hydraulic control unit): 5,380 lb
  • Beam length: 4'7"
  • Hydraulically-controlled parallelogram-type ripper with one shank. Digging angle infinitely adjustable. Standard digging angle: 49°
  • Maximum digging depth: 4'1"
  • Maximum lift above ground: 3'1"

Other:

  • HD Counterweight 9-plate with rigid drawbar, 7,860 lb

Dozer Equipment:

  • SIGMADOZER®
  • Semi-U
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