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Large dozer

D155PX-8 LGP

  • Horsepower 264 kW @ 1 900 rpm 354 HP @ 1,900 rpm
  • Operating weight 42 102 kg 92,820 lbs.
  • Blade capacity 7.3 - 12.0 m³ 9.6 - 15.7 yd³

Torque converter dozers for your heavy jobs

For pushing massive loads on soft ground, the D155PX-8 LGP (low ground pressure). An 8-roller undercarriage with track shoe size up to 38” (965 mm) wide for outstanding traction and balance with exceptional floatation. Optional extended wear life undercarriage with 34” wide PLUS (Parallel Link Undercarriage System) rotating bushing track shoes available.

  • Engineered for powerful dozing
  • Excellent blade capacity
  • Quiet cab with smooth ride and great visibility

Features and benefits

Custom build the dozer you need

All the dozers in the D65/85/155 family offer you outstanding power, economy and reliability. Customize yours with the blade (straight, Semi-U, Sigmadozer and Full U (D155 only)), track shoe width and horsepower combo best suited to your particular application.

Helps minimize fuel use

An advanced Tier 4 engine offers you a potent combo of power and fuel efficiency. An auto idle shutdown, adjustable from 5-60 minutes, also helps cut fuel use and emissions.

Controls help fight operator fatigue

Operators will enjoy the palm command electronic control joysticks that fit the natural relaxed shape of their hands. Auto-shift or manual-shift modes are easily selected with one push of a button for precision with less fatigue over the course of a shift.

Smooth, powerful handling

Your operators can execute smooth powerful turns with the hydrostatic steering system. It transmits engine power to both tracks without power interruption and minimizes turning radius with counter-rotation while in neutral.

Long-lasting undercarriage

Get the most from your dozer. The Parallel Link Undercarriage System (PLUS) with rotating bushings delivers up to twice the life of our conventional undercarriage with no pin and bushing turn required. Parts wear evenly and last longer before needing replacement.

Work with fuel-efficient power

Seek maximum work efficiency with a lock-up torque converter. It determines the appropriate gear based on load and conditions. The lockup mechanism then automatically transfers engine power directly to the transmission, helping boost drive train efficiency.

Help operators stay focused

Your operators perform best when they’re comfortable. That’s why they’ll love the air suspension seat with lumbar support and tilt. It’s easy for them to adjust to suit their needs, and electric heat helps them stay comfortable in the cold.

Situational awareness

A standard rear camera monitoring system displays the view behind the dozer on the large color monitor in the cab.

No-hassle DPF regeneration

Tier 4 machines use diesel particulate filters to burn off engine soot via regeneration. To help make sure it rarely impacts your operation, all D65/D85/D155 models use continuous passive regeneration, and active regeneration that typically doesn’t require the dozer to stop.

Efficient blade pitch operation

Pressing the auto-pitch switch* lets the operator toggle blade pitch position from dig to dump with no lever movements. The blade pitch control can be set to automatically return to the digging position when reverse is selected. * Requires dual tilt dozer

Ergonomic ripper controls

Operators will love the ergonomic ripper control lever that incorporates an auto-return function. It automatically raises the ripper so they can stop grappling with levers and focus on other tasks. It kicks in when travel lever is moved to reverse.

Specifications for D155PX-8 LGP

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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
Final Drive
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.
Hydraulic System

Standard rear Closed-center load sensing system (CLSS) designed for precise and responsive control, and for efficient simultaneous operation. High flow hydraulics for towing winch is standard. Base machine is equipped with dual tilt and pitch dozer hydraulics for semi-u blade. Angle blade is equipped with dual tilt, no pitch.

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, Semi-U tilt dozer and Full-U tilt dozer.
Positions: Blade lift Raise, hold, lower, and float
Blade tilt Right, hold, and left
Hydraulic cylinders Double-acting, piston
Number of cylinders Bore
Blade Lift / 2 110 mm
Blade Tilt (Dual tilt) / 2 160 mm
Blade Tilt (Single Tilt) / 1 160 mm
Hydraulic oil capacity (refill):
Angle dozer 95 L
Semi-U dozer 95 L

Standard rear Closed-center load sensing system (CLSS) designed for precise and responsive control, and for efficient simultaneous operation. High flow hydraulics for towing winch is standard. Base machine is equipped with dual tilt and pitch dozer hydraulics for semi-u blade. Angle blade is equipped with dual tilt, no pitch.

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

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Control valves:
Spool control valve for SIGMADOZER, Semi-U tilt dozer and Full-U tilt dozer.
Positions: Blade lift Raise, hold, lower, and float
Blade tilt Right, hold, and left
Hydraulic cylinders Double-acting, piston
Number of cylinders Bore
Blade Lift / 2 4.33 in
Blade Tilt (Dual tilt) / 2 6.30 in
Blade Tilt (Single Tilt) / 1 6.30 in
Hydraulic oil capacity (refill):
Angle dozer 25.1 US gal
Semi-U dozer 25.1 US gal
Operating Weight
Tractor weight 38 600 kg
Operating weight 42 100 kg
Ground pressure 52.9 kPa
Tractor weight 85,100 lbs.
Operating weight 92,820 lbs.
Ground pressure 7.67 psi
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
Blades
Angle Blade
Capacity 7.3 m3
Width at cutting edge 5 791 mm
Height 1 353 mm
Tilt, max angle 9.5 deg
Tilt, max dimension 965 mm
Weight 6 670 kg
Semi-u blade 39 L
Capacity 9.8 - 12.0 m3
Width over end bits 4 598 mm
Weight ‘AR” spec / non ‘AR” 5 775 kg / 5 055 kg
Angle Blade
Capacity 9.6 yd3
Width at cutting edge 19 ft. 0 in
Height 4 ft. 5 in
Tilt, max angle 9.5 degrees
Tilt, max dimension 38 in
Weight 14700 lbs.
Semi-u blade 10.3 US gal
Capacity 12.9 - 15.7 yd3
Width over end bits 15 ft. 1 in
Weight ‘AR” spec / non ‘AR” 12732 lbs. / 11,114 lbs.
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
Undercarriage

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

Track roller frame: Monocoque, high-tensilestrength steel construction

Fixed mounted 8-roller undercarriage
Lubricated track rollers are rigid mounted to the track frame.

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) 45
Grouser height 80 mm
Shoe width (standard/maximum) 965 mm
Ground contact area 78 037 cm²
Ground pressure (tractor only) 52.9 kPa
Number of track rollers (each side) 8
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

Fixed mounted 8-roller undercarriage
Lubricated track rollers are rigid mounted to the track frame.

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) 45
Grouser height 3.1 in
Shoe width (standard/maximum) 38 in
Ground contact area 12,096 in²
Ground pressure (tractor only) 7.67 psi
Number of track rollers (each side) 8
Number of carrier rollers (each side) 2
  • 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
  • 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
  • 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
  • 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
  • Transmission with auto/manual shift modes
  • Underguards, heavy duty
  • Hinged belly pans
  • Water separator, fuel
  • Wide core cooling package, 6 fins per inch spacing

Blades

  • Manual Angle Power Tilt 7.3 m3
  • Semi-U dual tilt and pitch 9.9 m3
  • Semi-U AR dual tilt and pitch 12.0 m3

Shoes

  • 38” Extreme Service, SALT
  • 34” Moderate Service, PLUS

Rear Attachment

  • HD long drawbar 240 kg
  • HD Counterweight 9-plate with rigid drawbar, 3568 kg

Abrasion Resistant Package

  • 34" 860mm PLUS tracks
  • AR steel liner on semi-u blade
  • Spill guard extension on semi-u
  • Grading skid plates on semi-u
  • Radiator mask reinforcement
  • Cooling fan hard coated steel
  • Radiator core guard
  • LED work lamps
  • Centralized grease zerks
  • Air suspension seat heated/cooled no rotate

Blades

  • Manual Angle Power Tilt 9.6 yd3
  • Semi-U dual tilt and pitch 12.9 yd3
  • Semi-U AR dual tilt and pitch 15.7 yd3

Shoes

  • 38” Extreme Service, SALT
  • 34” Moderate Service, PLUS

Rear Attachment

  • HD long drawbar 528 lb
  • HD Counterweight 9-plate with rigid drawbar, 7,860 lb

Abrasion Resistant Package

  • 34" 860mm PLUS tracks
  • AR steel liner on semi-u blade
  • Spill guard extension on semi-u
  • Grading skid plates on semi-u
  • Radiator mask reinforcement
  • Cooling fan hard coated steel
  • Radiator core guard
  • LED work lamps
  • Centralized grease zerks
  • Air suspension seat heated/cooled no rotate
Support you can count on

Technology that works as hard as you do

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