Motor grader

GD955-7

  • Horsepower 426 HP @ 1900 RPM 426 HP @ 1900 RPM
  • Operating weight 104,323 lbs. 104,323 lbs.
  • Moldboard 18-foot standard, 20-foot moldboard optional Standard: 18 foot, Optional: 20 foot

Get smooth, efficient performance for all you grading tasks

When you need increased efficiency when maintaining your quarry or mine site, choose the powerful capabilities of Komatsu's GD955-7 motor grader to help clear the way. With best-in-class blade downforce pressure for efficient grading performance and plenty of horsepower to boost productivity, this motor grader will help you build and maintain stable, efficient roads for your haulage operation.

  • 50% more operating weight for increased blade downforce pressure and stability

  • Up to 33% increase in productivity with 18-foot moldboard*

  • Up to 46% increase in productivity with 20-foot moldboard*
  • Up to 21% reduction in total maintenance time with circle bearing system and auto-lubrication *

    *Compared to the previous model

Features and benefits

Motor Grader-GD955-AZPG-JQ-231009-3K1A8563.psd

Get consistent, reliable grades

A long wheelbase and heavy operating weight allow the GD955-7 to achieve high blade downforce pressures at more aggressive moldboard angles for improved penetration and material flow in hard-packed road surface applications.
Motor Grader-GD955-AZPG-JQ-230802-3K1A7715.psd

Work effectively in confined areas

The large 27-degree articulation angle allows a tight turning radius and provides maneuverability for narrow haul road applications in confined spaces and around obstacles.
Motor Grader-GD955-K17-17-01f-As.psd

Strong and durable structure

Redesigned front and rear frames help withstand bending forces and torsional loads, promoting reduced life-cycle costs and a longer service life.
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Make maintenance easy

A newly adopted bearing-type circle assembly eliminates wear plates and the need for frequent play adjustments to help minimize downtime. Coupled with an auto-lubrication system, this helps to reduce maintenance times by up to 21%*.
Motor Grader-GD955-K17-298-As.psd

Optimize your machine's performance

Perform routine checks, inspections and repairs conveniently with a centrally located, ground-level service center. Regular maintenance helps promote your machine's uptime, while easy access streamlines maintenance workflow.
Motor Grader-GD955-AZPG-JQ-231009-3K1A8495.psd

Flexible for all operator levels

Enhance production with the efficiency of a direct-drive transmission and the controllability of a torque converter drive transmission. Perfect for trained operators of all experience levels and applicable to a wide variety of tasks, including maintaining and building haul roads
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Stay comfortable while working

Operators can work comfortably in the cab throughout the day with an air-suspension, heated and ventilated seat that helps dampen mechanical vibrations. Operators can also electronically or manually adjust the control lever console height to their preference.
Motor Grader-GD955-K17-20-01f-As.jpg

Precise control efficient operation

Controls within easy reach allow operators to quickly adjust to changing grading conditions or terrain. This helps optimize performance, while fingertip controls make for a more ergonomic and comfortable working environment.
Motor Grader-GD955-K17-21-04f-As.psd

Facilitating work site visibility

The hexangular cab and integrated control console layout allow for improved visibility to the moldboard. Strategically placed mirrors enhance visibility, while KomVision provides a bird’s-eye view around the vehicle on an in-cab monitor.

*Compared to the previous model

Specifications for GD655-7

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US system Metric
Engine
Model Komatsu SAA6D140E-7
Type Water-cooled, 4-cycle, direct injection
Aspiration Turbocharged and air-to-air aftercooled
No. of cylinders 6
Bore 140 mm
Stroke 165 mm
Piston displacement

15.24 L

Engine power (manual mode)
SAE J1995 Gross 318 kW (426 HP)/1,900 rpm
ISO 14396 318 kW (426 HP)/1,900 rpm
ISO 9249 (net engine power) Net 311 kW (417 HP)/1,900 rpm
Maximum torque 1,586 ft.-lbs. 2,150 N·m (219 kgf·m)/1,350 rpm
Torque rise 37%
Fan speed Max. 1,300 rpm
Air cleaner 2-stage, dry-type
U.S. EPA Tier 4 Final emissions certified.

Model Komatsu SAA6D140E-7 
Type Water-cooled, 4-cycle, direct injection
Aspiration Turbocharged and air-to-air aftercooled
No. of cylinders 6
Bore 5.6"
Stroke 6.5"
Piston displacement

4 gal

Engine power (manual mode)
SAE J1995 Gross 318 kW (426 HP)/1,900 rpm
ISO 14396 318 kW (426 HP)/1,900 rpm
ISO 9249 (net engine power) Net 311 kW (417 HP)/1,900 rpm
Maximum torque 1,586 ft.-lbs. 2,150 N·m (219 kgf·m)/1,350 rpm
Torque rise 37%
Fan speed Max. 1,300 rpm
Air cleaner 2-stage, dry-type
U.S. EPA Tier 4 Final emissions certified.  
Tandem drive
Oscillating welded box section 739 mm x 296 mm
Side wall thickness: inner 25 mm
outer 25 mm
Wheel axle spacing 1,981 mm

 Oscillating welded box section 2' 5" x 12" 
 Side wall thickness: inner  1"
 outer  1"
 Wheel axle spacing  6' 6"

Front axle
Type Solid bar construction welded steel sections
Ground clearance at pivot 710 mm
Wheel lean angle, right or left 14°
Oscillation, total 32°
Type Solid bar construction welded steel sections
Ground clearance at pivot 2' 4" 
Wheel lean angle, right or left 14°
Oscillation, total 32°
Rear axle

Alloy steel, heat treated, semi-floating axle with lock/unlock differential (auto/manual)

Alloy steel, heat treated, semi-floating axle with lock/unlock differential (auto/manual)

Transmissions and torque converter
 Gear Forward        Reverse      
   *1    *2     *1    *2  
 1st  3.3 mph  5.3 km/h  3.5 mph  5.7 km/h  2.8 mph  4.5 km/h  3 mph  4.9 km/h
 2nd  4.5 mph  7.2 km/h  4.8 mph  7.8 km/h  3.8 mph  6.1 km/h   4.1 mph  6.6 km/h
 3rd  6.3 mph  10.2 km/h 6.8 mph   11 km/h  5.4 mph  8.7 km/h   5.8 mph  9.4 km/h
 4th  8.5 mph  13.7 km/h  9.1 mph   14.6 km/h  7.3 mph  11.7 km/h  7.8 mph  12.6 km/h
 5th  10.4 mph  16.8 km/h  11.1 mph  17.9 km/h  9.9 mph  15.9 km/h  10.6 mph  17 km/h
 6th  14.3 mph  23.0 km/h  15 mph  24.2 km/h  13.5 mph  21.8 km/h  14.3 mph  23 km/h
 7th  20.2 mph  32.5 km/h  20.9 mph  33.7 km/h  19.1 mph  30.8 km/h  19.9 mph  32.1 km/h
 8th  27.1 mph  43.6 km/h  27.6 mph  44.4 km/h  25.7 mph  41.4 km/h  26.3 mph  42.3 km/h

*1 Travel speeds calculated with 26.5R25 L3 tires at rated engine rpm and hard flat road
*2 Travel speeds calculated with 26.5R25 L3 tires at full accelerator and hard flat road

 Gear Forward        Reverse      
   *1    *2     *1    *2  
 1st  3.3 mph  5.3 km/h  3.5 mph  5.7 km/h  2.8 mph  4.5 km/h  3 mph  4.9 km/h
 2nd  4.5 mph  7.2 km/h  4.8 mph  7.8 km/h  3.8 mph  6.1 km/h   4.1 mph  6.6 km/h
 3rd  6.3 mph  10.2 km/h 6.8 mph   11 km/h  5.4 mph  8.7 km/h   5.8 mph  9.4 km/h
 4th  8.5 mph  13.7 km/h  9.1 mph   14.6 km/h  7.3 mph  11.7 km/h  7.8 mph  12.6 km/h
 5th  10.4 mph  16.8 km/h  11.1 mph  17.9 km/h  9.9 mph  15.9 km/h  10.6 mph  17 km/h
 6th  14.3 mph  23.0 km/h  15 mph  24.2 km/h  13.5 mph  21.8 km/h  14.3 mph  23 km/h
 7th  20.2 mph  32.5 km/h  20.9 mph  33.7 km/h  19.1 mph  30.8 km/h  19.9 mph  32.1 km/h
 8th  27.1 mph  43.6 km/h  27.6 mph  44.4 km/h  25.7 mph  41.4 km/h  26.3 mph  42.3 km/h

*1 Travel speeds calculated with 26.5R25 L3 tires at rated engine rpm and hard flat road
*2 Travel speeds calculated with 26.5R25 L3 tires at full accelerator and hard flat road

Steering

Hydraulic power steering provides stopped engine steering meeting ISO 5010

Minimum turning radius Minimum turning radius 9,300 mm
Minimum turning radius Maximum steering range, right or left 50°
Minimum turning radius Articulation, right or left 70°

Hydraulic power steering provides stopped engine steering meeting ISO 5010

Minimum turning radius Minimum turning radius 30' 6"
Minimum turning radius Maximum steering range, right or left 50°
Minimum turning radius Articulation, right or left 70°
Brakes

Service brake: Foot operated, wet multiple-disc brakes, hydraulically actuated on four tandem wheels 

Parking brake: Manually actuated, spring applied on four tandem wheels, hydraulically released wet disc 

Service brake: Foot operated, wet multiple-disc brakes, hydraulically actuated on four tandem wheels 

Parking brake: Manually actuated, spring applied on four tandem wheels, hydraulically released wet disc 

Frame
Front Frame Structure  
Height 504 mm
Width 470 mm
Side 25/32 mm
Upper, lower 28/32 mm
Front Frame Structure  
Height 1' 8"
Width 1' 7"
Side 1"/1.3"
Upper, lower 1.1"/1.3"
Drawbar

A-shaped, welded construction for maximum strength with a replaceable drawbar ball

Drawbar frame 310 mm x 32 mm

A-shaped, welded construction for maximum strength with a replaceable drawbar ball

Drawbar frame 1' x 1.25"
Circle

Lubricated bearing type circle; Circle and pinion require no adjustment

Diameter (outside) 1,822 mm
Circle reversing control hydraulic rotation 130°

Lubricated bearing type circle; Circle and pinion require no adjustment

Diameter (outside) 6'
Circle reversing control hydraulic rotation 130°
Moldboard

Hydraulic power shift fabricated from steel. Includes replaceable metal wear inserts, cutting edge and end bits. Cutting edge and end bits are hardened.

Dimensions 5,489 mm x 960 mm x 25 mm
Arc radius 414 mm
Cutting edge 254 mm x 25 mm
Replaceable/Reversible side edges 204 mm x 490 mm x 19 mm
Blade pull: 26,816 kgf
Blade down pressure: 22,230 kgf

Hydraulic power shift fabricated from steel. Includes replaceable metal wear inserts, cutting edge and end bits. Cutting edge and end bits are hardened.

Dimensions 18' x 3' 2" x 1"
Arc radius 1' 4"
Cutting edge 10" x 1"
Replaceable/Reversible side edges 8" x 1' 7" x .75"
Blade pull: 59,119 lbf.
Blade down pressure: 49,009 lbf.
Blade range
Moldboard side shift:  
Right 818 mm
Left 916 mm
Maximum shoulder reach outside rear tires (frame straight)  
Right 2,119 mm
Left 2,126 mm
Maximum lift above ground 498 mm
Maximum cutting depth 542 mm
Blade tip angle 49-degrees forward, 3-degrees backward
Moldboard side shift:  
Right 2' 8"
Left 3' 1"
Maximum shoulder reach outside rear tires (frame straight)  
Right 6' 11"
Left 7'
Maximum lift above ground 1' 8"
Maximum cutting depth 1' 9"
Blade tip angle 49-degrees forward, 3-degrees backward
Hydraulics

Load-sensing closed center hydraulics with variable displacement piston pump. Short stroke/low effort direct acting control valves with preselected maximum flow setting to each function. Double acting anti-drift check valves on blade lift, tip, drawbar shift, articulation, ripper and leaning wheels

Output (at engine rated rpm) 315.2 L/min
Maximum system pressure 27.5 MPa 280 kgf/cm2

Load-sensing closed center hydraulics with variable displacement piston pump. Short stroke/low effort direct acting control valves with preselected maximum flow setting to each function. Double acting anti-drift check valves on blade lift, tip, drawbar shift, articulation, ripper and leaning wheels

Output (at engine rated rpm) 83.3 gpm
Maximum system pressure 3,989 psi
Instrument

Electric monitoring system with diagnostics

Standard guages

Articulation, engine coolant temperature, fuel level, speedometer, transmission shift indicator, engine tachometer, torque converter oil temperature, DEF level, hydraulic oil temperature, ECO gauge

Electric monitoring system with diagnostics

Standard guages

Articulation, engine coolant temperature, fuel level, speedometer, transmission shift indicator, engine tachometer, torque converter oil temperature, DEF level, hydraulic oil temperature, ECO gauge

Capacities (refilling)
Fuel tank 717 L
DEF tank 36 L
Cooling system 80 L
Crank case 50 L
Transmission 85 L
Final drive 56 L
Tandem housing (each) 199 L
Hydraulic system 147 L
Circle reverse housing 28 L
Fuel tank 189 gal
DEF tank 10 gal
Cooling system 21 gal
Crank case 13 gal
Transmission 23 gal
Final drive 15 gal
Tandem housing (each) 53 gal
Hydraulic system 39 gal
Circle reverse housing 7 gal
Operating weight (approximate)

Includes lubricants, coolant, full fuel tank, 5.5 m blade, L3 tire, ripper (three shanks) and pusher

Total   47,320 kg
 On front wheels  13,800 kg
 On rear wheels  33,520 kg

Includes lubricants, coolant, full fuel tank, 6.1 m blade, L4 tire, ripper (five shanks), pusher and access platform

Total 48,570 kg
On front wheels 14,070 kg
On rear wheels 34,500 kg

Includes lubricants, coolant, full fuel tank, 5.5 m blade, L3 tire, ripper (three shanks) and pusher

Total   104,323 lbs.
 On front wheels  30,424 lbs.
 On rear wheels  73,899 lbs.

Includes lubricants, coolant, full fuel tank, 6.1 m blade, L4 tire, ripper (five shanks), pusher and access platform

Total 107,079 lbs.
On front wheels 31,019 lbs.
On rear wheels 76,059 lbs.
Ripper
Ripper shank holders 7
Ripping depth 537 mm
Ripper shank holder spacing 501 mm
Penetration force 232 kN
Pryout force 242 kN

Ripper shank holders 7
Ripping depth 1' 9"
Ripper shank holder spacing 1' 8"
Penetration force 52,156 lbf.
Pryout force 54,404 lbf.

Engine and its related items:

  • Air cleaner, double element with dust indicator
  • Alternator, 24V/140 A
  • Batteries, maintenance free, 2 x 12V
  • Electric priming fuel pump
  • Engine, Komatsu SAA6D140E-7, U.S. EPA Tier 4 Final emissions certified
  • Engine power mode select (Power, economy and middle speed)
  • Fuel line pre-filter
  • Hydraulically driven reversible cooling fan
  • Komatsu Diesel Particulate Filter
  • Selective catalytic reduction
  • Starting motor, 11.0 kW

General equipment

  • Emergency stop switches (4)
  • Alarm, back up
  • Anchor point for tie offs
  • Disconnect switches, battery and starting motor
  • Engine shutdown secondary switch (in cab)
  • Hammer (emergency exit)
  • Horn, electric
  • KomVision Camera System
  • Machine lock out system
  • Operator presence monitoring system
  • Parking brake, spring applied, hydraulic release, wet disc
  • Rearview monitor and camera
  • Secondary brake (ISO 3450)
  • Secondary steering, automatic, electric
  • Service brakes, fully hydraulic wet multiple-disc

Lighting system

  • Access lamps, LED
  • Backup lamps, LED
  • Beacon lamp, LED
  • Cab mounted work lamps, LED
  • Engine bay lamp, LED
  • Front work lamps, LED
  • Head lamps, high and low beam, LED
  • Rear work lamps, LED
  • Stop and tail lamps, LED
  • Turn signal lamps, LED

Operator environment

  • Air conditioner (R134a) with heater
  • Cab mount, viscous
  • Defogger glass, rear
  • Doors, left and right side with wipers
  • Electrical height adjustable consoles, left and right
  • Electrical outlets (2 x 12V outlets, 1 x 24V outlet)
  • Floor mat
  • Instrument panel and monitoring system
  • Mirrors, interior cab, left and left exterior mirrors
  • Mirrors, outside heated and power adjustable
  • Operator seat with 2-point seat belt, reclining, air suspension type
  • Multi-color monitor with 7-inch LCD display
  • Radio, AM/FM with AUX input, Bluetooth®
  • Room lamp, LED
  • ROPS/FOPS (ISO 3471/ISO 3449)
  • Operator seat with 3-point seat belt, reclining, air suspension type
  • Space for lunch box
  • Steering lever, electric, palm control
  • Steering wheel, tilt and telescopic
  • USB port for charging
  • Wipers, front, doors and rear

Power train

  • Automatic differential lock
  • Axle, rear semi floating, planetary type
  • Brake, parking, spring applied, hydraulically released wet disc
  • Differential, manual lock/unlock
  • Dual mode transmission (8F/8R) power shift direct drive and torque converter with auto shift
  • Engine overrun warning and protection

Work equipment and hydraulics

  • Accumulators, blade lift
  • Articulation, automatic return-to-center
  • Clutch, circle drive slip
  • Cutting edges, flat, 254 mm x 25 mm,19 mm mounting bolts
  • Drawbar, bearing type circle
  • End bits, 204 mm x 19 mm, 19 mm) mounting bolts
  • Moldboard, hydraulic side shift and tilt, 5,500 mm x 810 mm x 25 mm
  • Rail guide with backlash adjustment bolts
  • Ripper, rear, 3 tooth
  • Tooth, ripper (7 shank)

Other equipment

  • Auto-lube, Graco
  • Fast fill coupler for fuel tank
  • Externally powered power train heaters, 230V (engine coolant, engine oil, transmission oil, differential oil)
  • Ground level service center (engine coolant, engine oil, transmission oil, hydraulic oil)
  • In conformity with lockout/tagout regulation
  • Komtrax Plus
  • KOWA sampling ports
  • Painting, Komatsu standard color scheme
  • Pre-cleaner, Turbo II
  • Platform, access platfrom with ladders
  • Pusher plate
  • Tires and rims: 26.5R25 (L-3) with multi-piece rim
  • Toolbox with lock
  • Transmission under guard
  • Vandalism protection, lockable fuel tank, hydraulic tank, battery cover, engine side covers
  • Wheel chocks (2)

Engine and its related items:

  • Air cleaner, double element with dust indicator
  • Alternator, 24V/140 A
  • Batteries, maintenance free, 2 x 12V
  • Electric priming fuel pump
  • Engine, Komatsu SAA6D140E-7, U.S. EPA Tier 4 Final emissions certified
  • Engine power mode select (Power, economy and middle speed)
  • Fuel line pre-filter
  • Hydraulically driven reversible cooling fan
  • Komatsu Diesel Particulate Filter
  • Selective catalytic reduction
  • Starting motor, 11.0 kW

General equipment

  • Emergency stop switches (4)
  • Alarm, back up
  • Anchor point for tie offs
  • Disconnect switches, battery and starting motor
  • Engine shutdown secondary switch (in cab)
  • Hammer (emergency exit)
  • Horn, electric
  • KomVision Camera System
  • Machine lock out system
  • Operator presence monitoring system
  • Parking brake, spring applied, hydraulic release, wet disc
  • Rearview monitor and camera
  • Secondary brake (ISO 3450)
  • Secondary steering, automatic, electric
  • Service brakes, fully hydraulic wet multiple-disc

Lighting system

  • Access lamps, LED
  • Backup lamps, LED
  • Beacon lamp, LED
  • Cab mounted work lamps, LED
  • Engine bay lamp, LED
  • Front work lamps, LED
  • Head lamps, high and low beam, LED
  • Rear work lamps, LED
  • Stop and tail lamps, LED
  • Turn signal lamps, LED

Operator environment

  • Air conditioner (R134a) with heater
  • Cab mount, viscous
  • Defogger glass, rear
  • Doors, left and right side with wipers
  • Electrical height adjustable consoles, left and right
  • Electrical outlets (2 x 12V outlets, 1 x 24V outlet)
  • Floor mat
  • Instrument panel and monitoring system
  • Mirrors, interior cab, left and left exterior mirrors
  • Mirrors, outside heated and power adjustable
  • Operator seat with 2-point seat belt, reclining, air suspension type
  • Multi-color monitor with 7-inch LCD display
  • Radio, AM/FM with AUX input, Bluetooth®
  • Room lamp, LED
  • ROPS/FOPS (ISO 3471/ISO 3449)
  • Operator seat with 3-point seat belt, reclining, air suspension type
  • Space for lunch box
  • Steering lever, electric, palm control
  • Steering wheel, tilt and telescopic
  • USB port for charging
  • Wipers, front, doors and rear

Power train

  • Automatic differential lock
  • Axle, rear semi floating, planetary type
  • Brake, parking, spring applied, hydraulically released wet disc
  • Differential, manual lock/unlock
  • Dual mode transmission (8F/8R) power shift direct drive and torque converter with auto shift
  • Engine overrun warning and protection

Work equipment and hydraulics

  • Accumulators, blade lift
  • Articulation, automatic return-to-center
  • Clutch, circle drive slip
  • Cutting edges, flat, 10" x 1", .75" mounting bolts
  • Drawbar, bearing type circle
  • End bits, 8" x .75", .75" mounting bolts
  • Moldboard, hydraulic side shift and tilt, 18' x 32" x 1"
  • Rail guide with backlash adjustment bolts
  • Ripper, rear, 3 tooth
  • Tooth, ripper (7 shank)

Other equipment

  • Auto-lube, Graco
  • Fast fill coupler for fuel tank
  • Externally powered power train heaters, 230V (engine coolant, engine oil, transmission oil, differential oil)
  • Ground level service center (engine coolant, engine oil, transmission oil, hydraulic oil)
  • In conformity with lockout/tagout regulation
  • Komtrax Plus
  • KOWA sampling ports
  • Painting, Komatsu standard color scheme
  • Pre-cleaner, Turbo II
  • Platform, access platfrom with ladders
  • Pusher plate
  • Tires and rims: 26.5R25 (L-3) with multi-piece rim
  • Toolbox with lock
  • Transmission under guard
  • Vandalism protection, lockable fuel tank, hydraulic tank, battery cover, engine side covers
  • Wheel chocks (2)

 

Work equipment and hydraulics

  • Moldboard, hydraulic side shift and tilt, 6,100 mm x 810 mm x 25 mm

Other equipment

  • Platform, rear entry access platform
  • Rear fenders

Work equipment and hydraulics

  • Moldboard, hydraulic side shift and tilt, 20' x 32" x 1"

Other equipment

  • Platform, rear entry access platform
  • Rear fenders
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