Motor grader

GD955-7

Horsepower 426 HP @ 1,900 rpm 426 HP @ 1,900 rpm
Operating weight 104,323 lbs. 104,323 lbs.
Moldboard 18-foot standard, 20-foot moldboard optional Standard: 18 ft., Optional: 20 ft.

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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.

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.

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%*.

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

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.

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.

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 GD955-7

Full specifications

Standard equipment

Optional equipment

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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)

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, 7 shankh

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, 7 shankh

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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GD955-7

Get smooth, efficient performance for all you grading tasks

Features and benefits

Get consistent, reliable grades

Work effectively in confined areas

Strong and durable structure

Make maintenance easy

Optimize your machine's performance

Flexible for all operator levels

Stay comfortable while working

Precise control efficient operation

Facilitating work site visibility

Specifications for GD955-7

Engine and its related items:

General equipment

Lighting system

Operator environment

Power train

Work equipment and hydraulics

Other equipment

Engine and its related items:

General equipment

Lighting system

Operator environment

Power train

Work equipment and hydraulics

Other equipment

Work equipment and hydraulics

Other equipment

Work equipment and hydraulics

Other equipment

Related products

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GD655-7

HD785-8

Find what works for you