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Oval track pipelayer

D155CX-8 (K170)

  • Horsepower 264 kW @ 1 900 rpm 354 HP @ 1,900 rpm
  • Operating weight 54 870 kg 120,970 lbs.
  • Lift capacity 77 272 kg 170,000 lbs.

Designed with pipelayers in mind. Built with purpose.

Developed and designed in conjunction with pipeline companies, the D155CX-8 has a 170,000-pound lift capacity and traditional oval track design to deliver the stability and performance required on large pipeline jobs. The draw works package and boom options have been specifically designed for handling up to 36-inch steel pipe, making it ideal for gas and oil projects.

  • Excellent stability with a traditional oval track undercarriage
  • High performance and lift capacity
  • 14% larger steering motor than the D155AX-8 base model dozer for improved maneuverability

Features and benefits

Longer track on ground

Extended track roller frames and wider track gauge over previous models provide a solid foundation for pipe lifting. Large 9-inch track pitch undercarriage is built for pipelayer applications.

Purpose-built structures

Exceptional structural strength with a new front bumper and integrated towing pin designed to accept a standard winch rope terminator. An extended main frame with a non-oscillating hard bar has all drawworks mounts factory integrated.

Drawworks package

The drawworks package uses custom-designed winches built to Komatsu specifications. Excellent hook speed, boom and counterweight control make precision pipework or handling large loads easy and efficient.

Easy machine access

Easily access your machine with integrated left/right front steps, left access ladder and left/right rear walkways.

Transport storage bracket

Integrated load block transport storage bracket makes disassembly and assembly easier for shipping.

Integrated ROPS cab

Standard enclosed ROPS cab with auto climate control, large cab windows and skylight viewing area provides a comfortable operator environment in hot and cold climates.

Three-camera system

Improve your operator confidence with standard front, rear and right-side cameras that provide improved situational awareness around the machine.

Hydrostatic steering system (HSS)

The Hydrostatic Steering System (HSS) with all-directional Palm Command Control System lever controls provide smooth, quick and powerful steering control in various ground conditions. A new 14% larger steering motor than the D155AX-8 base model improves steering power and maneuverability.

Precision single joystick drawworks control

A single joystick for control of load line, boom and counterweight provides your operator precise load control.

Cold weather operation

Designed for cold weather operation with large capacity batteries, engine air intake heater grid, and provisions to easily install engine oil and coolant heaters.

Iridium Satellite Communications

High quality satellite data communications for Komtrax pipelayer telematics in remote areas where cellular communication network coverage is poor or not available. Komtrax data is provided free for life of the machine.

Advanced diagnostic system

Continuously monitor your machines operation and vital systems to identify machine issues, assist with troubleshooting, and minimize downtime.

Specifications for D155CX-8 K170

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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 3-speed 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. 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 Gear forward 11.6 kph
3rd Gear reverse 14.0 kph

Komatsu's 3-speed 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. 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 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.

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.

Undercarriage
Suspension Fixed roller, non-oscillating track frame
Track roller frame Monocoque, high-tensile-strength steel construction
Track type Sealed and lubricated
Track shoe Moderate service with clipped grouser
Shoe width  810 mm
Shoes per side 48
Track gauge 2 400 mm
Length of track on ground 3 925 mm
Ground contact area (ISO 16754) 7.1 m2
Ground pressure (ISO 16754)1 0.77 kgf/cm2
Track rollers per side  9

Carrier rollers per side 

2
Grouser height  80 mm
Link pitch  228 mm

1 Ground pressure with 7.3 m long boom and drawbar

Suspension Fixed roller, non-oscillating track frame
Track roller frame Monocoque, high-tensile-strength steel construction
Track type Sealed and lubricated
Track shoe Moderate service with clipped grouser
Shoe width  32 in
Shoes per side 48
Track gauge 94.5 in
Length of track on ground 154 in
Ground contact area (ISO 16754) 10,990 in2
Ground pressure (ISO 16754)1 11.0 psi
Track rollers per side  9

Carrier rollers per side 

2
Grouser height  3.1 in
Link pitch  9.0 in

1 Ground pressure with 24 ft. long boom and drawbar

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 320 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

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 84.6 US gal for implement at rated engine rpm.

Relief valve setting

. . . . . . . . . . . . . . . . for implement 3,980 psi

. . . . . . . . . . . . . . . . . . for steering 5,550 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 (tank only) 95 L
Hydraulic oil capacity (system)  133 L 
Boom Winch Case (gearbox) 23.8 L
Hook Winch Case (gearbox) 15.5 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 (tank only) 25.1 US gal
Hydraulic oil capacity (system)  35 US gal 
Boom Winch Case (gearbox) 6.3 US gal
Hook Winch Case (gearbox) 4.1 US gal
Component weights
Counterweight total weight 6 070 kg
Counterweight section quantity 11
Weight per section 11 @ 552 kg
Boom 7.3 m standard 1 715 kg
Boom 8.5 m optional 1 927 kg
Counterweight frame 1 881 kg
Counterweight yoke 636 kg
Boom block and load block 706 kg
Counterweight total weight 13,380 lbs.
Counterweight section quantity 11
Weight per section 11 @ 1,217 lbs.
Boom 24' standard 3,781 lbs.
Boom 28' optional 4,249 lbs.
Counterweight frame 4,146 lbs.
Counterweight yoke 1,400 lbs.
Boom block and load block 1,556 lbs.
Pipelaying equipment
Boom length standard 24'
Boom length optional 28'
Boom parting lines 5
Hook line partings 6
Hook low speed raise 8.5 - 13.0 m/min
Hook high speed raise 19.3 - 23.3 m/min
Hook free fall Yes
Boom winch drum diameter 254 mm
Boom winch drum width 279 mm
Boom winch drum cable capacity 75.3 m
Boom winch drum rope diameter 19 mm
Hook winch drum diameter 254 mm
Hook winch drum width 432 mm
Hook winch drum cable capacity 152 m
Hook winch drum rope diameter 19 mm
Boom length standard 24'
Boom length optional 28'
Boom parting lines 5
Hook line partings 6
Hook low speed raise 28 - 42.8 FPM
Hook high speed raise 63.3 - 76.6 FPM
Hook free fall Yes
Boom winch drum diameter 10" 
Boom winch drum width 11"
Boom winch drum cable capacity 247'
Boom winch drum rope diameter 0.75"
Hook winch drum diameter 10"
Hook winch drum width 17"
Hook winch drum cable capacity 499'
Hook winch drum rope diameter 0.75"
  • Air cleaner, double element with dust indicator
  • Alternator, 140 ampere/24V
  • Backup alarm
  • Batteries, 200 Ah/2 x 12V
  • Battery disconnect switch with lockout
  • Boom 7.3m long
  • Boom and C'wt limit switches
  • Bumper, front with pull device
  • Color monitor, LCD
  • Counterweight, segmented
  • Decelerator pedal
  • Draw works with 7.3m boom, hook, blocks, cables, extendable counterweight
  • Ecology drains
    • Engine oil
    • Coolant
    • Hydraulic oil
    • Fuel tank
  • 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
  • Extended length fixed roller track frame, wide track gauge
  • Fast fuel provision
  • Fenders
  • Front pull hook
  • Fuel pre-filter and primary filter
  • Fuel priming pump, electric
  • Grid heater starting aid in cold weather
  • Hard bar, integral non-oscillating
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with manual reverse clean mode and cold weather reverse operating mode
  • Hydraulics for draw works and counterweight
  • Hydraulics for towing winch (high flow)
  • KOMTRAX® Level 5, Iridium satelite
  • Komatsu Diesel Particulate Filter (KDPF)
  • Variable Geometry Turbocharger (VGT)
  • Komatsu Selective Catalytic Reduction (SCR)
  • Load Moment Indicator with boom angle indicator and Anti-2-block alarm
  • Locks, filler caps and covers
  • Oil pressure check ports and covers
  • Oil pressure check ports for power train
  • PM service connector
  • Provision for Load Moment Indicator
  • Radiator mask, double door, heavy-duty, hinged perforated
  • Radiator reserve tank
  • Rear cover
  • Restraint harness tie-off points
  • ROPS cab
    • Air conditioner/heater/defroster
      • Autoclimate control
      • Pressurized with air precleaner
      • Condenser remote mounted
      • Skylight in roof
      • Emergency exit
    • Cab accessories
      • 12V power supply (2 ports)
      • Cup holder
      • Rearview mirro
      • Rear view monitoring (1 camera)
      • Forward view monitoring (1 camera)
      • Right view monitoring (1 camera)
      • AM/FM Radio w/remote AUX plug (3.5 mm)
      • Lunch box holder
    • Work lights, 10 LED type
      • 2 front, hood mounted
      • 2 front, cab mounted
      • 2 side, cab mounted
      • 2 rear, fender mounted
      • 2 rear, cab mounted
    • Monitor with 7" color display
      • Diagnostics capability
      • Performance records
      • Service records
  • 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/24V
  • Starting aid, air intake heater grid
  • Steering system
    • Hydrostatic Steering System (HSS)
      • High capacity steering motor
  • Storage bracket for blocks during transport
  • Torque converter
  • Track roller guards, end and center guiding sections
  • Track shoe assembly
    • 228 mm pitch sealed and lubricated
    • Master links
    • 810 mm clipped moderate service
  • Transmission, 3-speed manual powershift
  • Underguards, heavy duty
    • Hinged belly pans
  • Walkway with steps and handrails
  • Water separator, fuel
  • Wide core cooling package, 6 fins per inch spacing

*Rear mounted equipment is not included in base machine standard equipment

**Cab meets:
ROPS standard ISO 3471:2008
FOPS Level 2 standard ISO 3449:2005

***Accumulator meets: CRN OH 5729.1

  • Air cleaner, double element with dust indicator
  • Alternator, 140 ampere/24V
  • Backup alarm
  • Batteries, 200 Ah/2 x 12V
  • Battery disconnect switch with lockout
  • Boom 24’ long
  • Boom and C'wt limit switches
  • Bumper, front with pull device
  • Color monitor, LCD
  • Counterweight, segmented
  • Decelerator pedal
  • Draw works with 24' boom, hook, blocks, cables, extendable counterweight
  • Ecology drains
    • Engine oil
    • Coolant
    • Hydraulic oil
    • Fuel tank
  • 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
  • Extended length fixed roller track frame, wide track gauge
  • Fast fuel provision
  • Fenders
  • Front pull hook
  • Fuel pre-filter and primary filter
  • Fuel priming pump, electric
  • Grid heater starting aid in cold weather
  • Hard bar, integral non-oscillating
  • High mount foot rests
  • Horn, warning
  • Hydraulic driven radiator cooling fan with manual reverse clean mode and cold weather reverse operating mode
  • Hydraulics for draw works and counterweight
  • Hydraulics for towing winch (high flow)
  • KOMTRAX® Level 5, Iridium satelite
  • Komatsu Diesel Particulate Filter (KDPF)
  • Variable Geometry Turbocharger (VGT)
  • Komatsu Selective Catalytic Reduction (SCR)
  • Load Moment Indicator with boom angle indicator and Anti-2-block alarm
  • Locks, filler caps and covers
  • Oil pressure check ports and covers
  • Oil pressure check ports for power train
  • PM service connector
  • Provision for Load Moment Indicator
  • Radiator mask, double door, heavy-duty, hinged perforated
  • Radiator reserve tank
  • Rear cover
  • Restraint harness tie-off points
  • ROPS cab
    • Air conditioner/heater/defroster
      • Autoclimate control
      • Pressurized with air precleaner
      • Condenser remote mounted
      • Skylight in roof
      • Emergency exit
    • Cab accessories
      • 12V power supply (2 ports)
      • Cup holder
      • Rearview mirro
      • Rear view monitoring (1 camera)
      • Forward view monitoring (1 camera)
      • Right view monitoring (1 camera)
      • AM/FM Radio w/remote AUX plug (3.5 mm)
      • Lunch box holder
    • Work lights, 10 LED type
      • 2 front, hood mounted
      • 2 front, cab mounted
      • 2 side, cab mounted
      • 2 rear, fender mounted
      • 2 rear, cab mounted
    • Monitor with 7" color display
      • Diagnostics capability
      • Performance records
      • Service records
  • 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, 11.0 kW/24V
  • Starting aid, air intake heater grid
  • Steering system
    • Hydrostatic Steering System (HSS)
      • High capacity steering motor
  • Storage bracket for blocks during transport
  • Torque converter
  • Track roller guards, end and center guiding sections
  • Track shoe assembly
    • 9" pitch sealed and lubricated
    • Master links
    • 32" clipped moderate service
  • Transmission, 3-speed manual powershift
  • Underguards, heavy duty
    • Hinged belly pans
  • Walkway with steps and handrails
  • Water separator, fuel
  • Wide core cooling package, 6 fins per inch spacing

*Rear mounted equipment is not included in base machine standard equipment

**Cab meets:
ROPS standard ISO 3471:2008
FOPS Level 2 standard ISO 3449:2005

***Accumulator meets: CRN OH 5729.1

  • Rear Attachment  
    - HD long drawbar240 kg
  • 8.5 m boom  
    - Includes longer hook cable
  • Rear Attachment  
    - HD long drawbar 528 lbs.
  • 28' boom  
    - Includes longer hook cable
Support you can count on

Technology that works as hard as you do

Phone and laptop displaying KOMTRAX data for dozers
Komtrax for construction equipment is Komatsu’s state of the art remote monitoring system, helping you keep track of where your machines are and how much they are working. The system seamlessly gathers important data that can help you coach operators to improve efficiencies and productivity.

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