Motor grader

GD655-6

Horsepower 163 kW @ 2 100 rpm 218 HP @ 2,100 rpm
Operating weight 16 940 kg 37,346 lbs.
Moldboard 4 m 14 ft.

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Overview
Specifications
Service and support
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Next-level grading

Looking for smooth accuracy in an operator-friendly machine? Powered by a unique dual-mode transmission, this grader has enhanced job site visibility and offers operators an exceptional tool for achieving surface precision.

Exceptional visibility
Smooth power and optimized control
High flow hydraulics with on-demand CLSS valves for operator efficiency
Dual engine power modes for increased fuel efficiency of up to 15%*
* compared to GD655-5

Features and benefits

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Unique dual-mode powershift transmission with torque-converter

Control, finesse and traction where it is needed — at the ground. For fine finish grading at a steady speed or for precise cutting around objects, the industry exclusive, dual-mode transmission with anti-stall technology allows for steady efficiency.

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Fuel efficiency power modes

Efficient operation with two selectable power settings. For fine finish grading or light-duty road maintenance, eco mode helps provide fuel efficiency, while heavy pushing or high-demand tasks are tackled in power mode.

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Blade lift accumulators standard

Help protect the moldboard, drawbar and blade circle from damage with two selectable function blade accumulators. Blade lift cylinders absorb impacts if the blade edge hits an immobile object such as a manhole, boulder or railroad crossing.

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Operator comfort

Long days on the job are more comfortable with the standard air suspension seat. The seat adjusts to the operator’s weight and dampens vibrations from the machine, helping to reduce fatigue.

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CLSS constant implement speed multi-circuit capable hydraulics

High-performance hydraulic system provides responsive control and smooth, constant speed. The closed-center load-sensing system allows for multiple circuits to operate simultaneously, independent of engine speed.

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Hexangular cab

Increase visibility with a commanding view of the job site. The hexangular, low-profile cab layout offers a wide field of vision, increasing the front and rear work equipment views.

Rearview camera

Make sure your operator can keep an eye on the surroundings. The standard rearview monitor system and dedicated display with custom settings means that the main monitor is always showing important machine information.

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Hydraulic-driven cooling fan

Run the fan only when needed, for increased efficiency and power. A hydraulic cooling fan senses engine load and temperature adjusting fan speed as necessary.

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Actionable insights

Keep track of your machine and its productivity with the latest Komtrax system. Receive service alerts, operating history, faults, and fuel usage reports remotely by anyone granted user access.

Specifications for GD655-6

Full specifications

Standard equipment

Optional equipment

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US system Metric

Engine

Model	SAA6D107E-3*
Type	Water-cooled, 4-cycle, direct injection
Aspiration	Turbocharged, aftercooled, cooled EGR
Number of cylinders	6
Bore	107 mm
Stroke	124 mm
Piston displacement	6.69 L
Gross horsepower (Manual mode):
P-mode
Gear 1-3 @ 2 000 rpm	136 kW
Gear 4-6 @ 2 000 rpm	151 kW
Gear 7-8 @ 2 100 rpm	165 kW
E-mode
Gear 1-6 @ 2 000 rpm	136 kW
Gear 7-8 @ 2 000 rpm	165 kW
Net horsepower (Manual mode):**
P-mode
Gear 1-3 @ 2 000 rpm	134 kW
Gear 4-6 @ 2 000 rpm	149 kW
Gear 7-8 @ 2 100 rpm	163 kW
E-mode
Gear 1-6 @ 2 000 rpm	134 kW
Gear 7-8 @ 2 000 rpm	163 kW
Max. torque @ 1 450 rpm	941 Nm 96.0 kg-m
Torque rise	30 %
Fan speed	Max. 1 450 rpm
Air cleaner	2-stage, dry-type

* EPA Tier 4 Final emissions certified.

** Net horsepower output for standard (SAE J1349) including air cleaner, alternator (not charging), water pump, lubricating oil, fuel pump, muffler and fan running at minimum speed.

Model	SAA6D107E-3*
Type	Water-cooled, 4-cycle, direct injection
Aspiration	Turbocharged, aftercooled, cooled EGR
Number of cylinders	6
Bore	4.21 in
Stroke	4.88 in
Piston displacement	408 in³
Gross horsepower (Manual mode):
P-mode
Gear 1-3 @ 2,000 rpm	183 HP
Gear 4-6 @ 2,000 rpm	203 HP
Gear 7-8 @ 2,100 rpm	221 HP
E-mode
Gear 1-6 @ 2,000 rpm	183 HP
Gear 7-8 @ 2,000 rpm	221 HP
Net horsepower (Manual mode):**
P-mode
Gear 1-3 @ 2,000 rpm	180 HP
Gear 4-6 @ 2,000 rpm	200 HP
Gear 7-8 @ 2,100 rpm	218 HP
E-mode
Gear 1-6 @ 2,000 rpm	180 HP
Gear 7-8 @ 2,000 rpm	218 HP
Max. torque @ 1,450 rpm	694 lbs.-ft.
Torque rise	30 %
Fan speed	Max. 1,450 rpm
Air cleaner	2-stage, dry-type

* EPA Tier 4 Final emissions certified.

** Net horsepower output for standard (SAE J1349) including air cleaner, alternator (not charging), water pump, lubricating oil, fuel pump, muffler and fan running at minimum speed.

Transmissions and torque converter

Full power shift transmission with integral free wheeling stator torque converter and lock-up.

Speeds (at rated engine speed)
Gear	Forward	Reverse
1st	3.4 kph	4.5 kph
2nd	5.0 kph	9.2 kph
3rd	7.0 kph	20.3 kph
4th	10.2 kph	40.3 kph
5th	15.4 kph	-
6th	22.3 kph	-
7th	30.6 kph	-
8th	44.3 kph	-

Full power shift transmission with integral free wheeling stator torque converter and lock-up.

Speeds (at rated engine speed)
Gear	Forward	Reverse
1st	2.1 mph	2.8 mph
2nd	3.1 mph	5.7 mph
3rd	4.3 mph	12.6 mph
4th	6.3 mph	25.0 mph
5th	9.6 mph	-
6th	13.9 mph	-
7th	19.0 mph	-
8th	27.5 mph	-

Tandem drive

Oscillating welded box section	520 x 202 mm
Side wall thickness:
Inner	22 mm
Outer	19 mm
Wheel axle spacing	1 525 mm
Tandem oscillation	11° forward
Tank	7 L

Oscillating welded box section	1 ft. 8 in x 8 in
Side wall thickness:
Inner	0.87 in
Outer	0.75 in
Wheel axle spacing	5 ft. 0 in
Tandem oscillation	13° reverse
Tank	1.8 US gal

Front axle

Type	Solid bar construction welded steel sections
Ground clearance at pivot	620 mm
Wheel lean angle, right or left	16°
Oscillation, total	32°

Type	Solid bar construction welded steel sections
Ground clearance at pivot	2 ft. 0 in
Wheel lean angle, right or left	16°
Oscillation, total	32°

Rear axle

Alloy steel, heat treated, full floating axle with lock/unlock differential

Wheels, front and rear

Bearings	Tapered roller
Tires	17.5R25
Tire rims (demountable)	13 in one-piece rims

Bearings	Tapered roller
Tires	17.5R25
Tire rims (demountable)	13 in one-piece rims

Steering

Hydraulic power steering providing stopped engine steering meeting ISO 5010.

Minimum turning radius	7.4 m
Maximum steering range, right or left	49°
Articulation, right or left	25°

Hydraulic power steering providing stopped engine steering meeting ISO 5010.

Minimum turning radius	24 ft. 3 in
Maximum steering range, right or left	49°
Articulation, right or left	25°

Brakes

Service brake: Foot operated, sealed oil disc brakes, hydraulically actuated on four tandem wheels

Parking brake: Manually actuated, spring applied, hydraulically released caliper

Service brake: Foot operated, sealed oil disc brakes, hydraulically actuated on four tandem wheels

Parking brake: Manually actuated, spring applied, hydraulically released caliper

Frame

Front Frame Structure
Height	300 mm
Width	300 mm
Upper, Lower.	25 mm

Front Frame Structure
Height	11.8 in
Width	11.8 in
Upper, Lower.	1.0 in

Drawbar

A-shaped, u-section press formed and welded construction for maximum strength with a replaceable drawbar ball

Drawbar frame

210 x 22 mm

A-shaped, u-section press formed and welded construction for maximum strength with a replaceable drawbar ball

Drawbar frame

8.3 x 0.87 in

Circle

Single piece rolled ring forging. Six circle support shoes with replaceable wear surface. Circle teeth hardened on front 180° of circle.

Diameter (outside)	1 530 mm
Circle reversing control hydraulic rotation	360°

Single piece rolled ring forging. Six circle support shoes with replaceable wear surface. Circle teeth hardened on front 180° of circle.

Diameter (outside)	5 ft. 0 in
Circle reversing control hydraulic rotation	360°

Moldboard

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

Dimensions	4 320 x 660 x 22 mm
Arc radius	432 mm
Cutting edge	152 x 16 mm
Replaceable/Reversible side edges	156 x 16 x 456 mm
Blade pull:
Base GVW	10 100 kg
With ripper GVW	10 980 kg
Blade down pressure:
Base GVW	6 940 kg
With ripper GVW	8 400 kg

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

Dimensions	14 ft. x 26 in x 0.87 in
Arc radius	1 ft. 5 in
Cutting edge	6 x 0.63 in
Replaceable/Reversible side edges	6 ft. x 0.63 in x 1 ft. 6 in
Blade pull:
Base GVW	22,267 lbs.
With ripper GVW	24,207 lbs.
Blade down pressure:
Base GVW	15,300 lbs.
With ripper GVW	18,519 lbs.

Blade range

Moldboard side shift:
Right	820 mm
Left	820 mm
Maximum shoulder reach outside rear tires (frame straight)
Right	2 000 mm
Left	2 000 mm
Maximum lift above ground	480 mm
Maximum cutting depth	615 mm
Maximum blade angle, right or left	90°
Blade tip angle	40° forward, 5° backward

Moldboard side shift:
Right	2 ft. 8 in
Left	2 ft. 8 in
Maximum shoulder reach outside rear tires (frame straight)
Right	6 ft. 7 in
Left	6 ft. 7 in
Maximum lift above ground	1 ft. 7 in
Maximum cutting depth	2 ft. 0 in
Maximum blade angle, right or left	90°
Blade tip angle	40° forward, 5° 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, circle shift, articulation, and leaning wheels.

Output (at engine rated rpm)	200 L/min
Standby pressure	3.4 MPa 35 kg/cm²
Maximum system pressure	20.6 MPa 210 kg/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, circle shift, articulation, and leaning wheels.

Output (at engine rated rpm)	52.8 gpm
Standby pressure	500 psi
Maximum system pressure	3,000 psi

Instrument

Electric monitoring system with diagnostics:

Gauges:
Standard - articulation, engine coolant temperature, fuel level, speed meter, transmission shift indicator, engine tachometer, torque converter oil temperature

Warning lights / Indicator:
Standard - battery charge, brake oil pressure, blade float, brake oil pressure, inching temperature, directional indicator, engine oil pressure, hydraulic oil temperature, heater signal, lift arm lock, parking brake, differential lock, torque converter oil, temperature, ecology, P mode, fan reverse, rpm set, high beam, working lights

Electric monitoring system with diagnostics:

Gauges:
Standard - articulation, engine coolant temperature, fuel level, speed meter, transmission shift indicator, engine tachometer, torque converter oil temperature

Warning lights / Indicator:
Standard - battery charge, brake oil pressure, blade float, brake oil pressure, inching temperature, directional indicator, engine oil pressure, hydraulic oil temperature, heater signal, lift arm lock, parking brake, differential lock, torque converter oil, temperature, ecology, P mode, fan reverse, rpm set, high beam, working lights

Capacities (refilling)

Fuel tank	390 L
Cooling system	30 L
Crank case	23 L
Transmission	45 L
Final drive	17 L
Tandem housing (each)	57 L
Hydraulic system	69 L
Circle reverse housing	7 L

Fuel tank	103 US gal
Cooling system	7.9 US gal
Crank case	6.1 US gal
Transmission	11.9 US gal
Final drive	4.5 US gal
Tandem housing (each)	15.1 US gal
Hydraulic system	18.2 US gal
Circle reverse housing	1.8 US gal

Operating weight (approximate)

Includes lubricants, coolant, full fuel tank
Total	16 940 kg
On rear wheels	12 620 kg
On front wheels	4 320 kg
With rear mounted ripper and front push plate:
Total	18 900 kg
On rear wheels	13 820 kg
On front wheels	5 070 kg
With mid-mounted scarifier:
Total	17 480 kg
On rear wheels	12 600 kg
On front wheels	4 870 kg

Includes lubricants, coolant, full fuel tank
Total	37,346 lbs.
On rear wheels	27,822 lbs.
On front wheels	9,524 lbs.
With rear mounted ripper and front push plate:
Total	41,667 lbs.
On rear wheels	30,468 lbs.
On front wheels	11,177 lbs.
With mid-mounted scarifier:
Total	38,537 lbs.
On rear wheels	27,778 lbs.
On front wheels	10,737 lbs.

Ripper

Ripping depth, maximum	425 mm
Ripper shank holders	5
Ripper shank holder spacing	534 mm
Penetration force	9 390 kg
Pryout force	17 600 kg
Machine length increase, beam raised	690 mm

Ripping depth, maximum	1 ft. 5 in
Ripper shank holders	5
Ripper shank holder spacing	1 ft. 9 in
Penetration force	20,701 lbs.
Pryout force	38,801 lbs.
Machine length increase, beam raised	2 ft. 5 in

Scarifier

Middle, V-type:
Working width	1 430 mm
Scarifying depth, maximum	190 mm
Scarifier shank holders	11
Scarifier shank holders spacing	138 mm
Rear:
Working width	2 186 mm
Scarifying depth, maximum	165 mm
Scarifier shank holders	9
Scarifier shank holders spacing	267 mm

Middle, V-type:
Working width	4 ft. 8 in
Scarifying depth, maximum	7.5 in
Scarifier shank holders	11
Scarifier shank holders spacing	5.4 in
Rear:
Working width	7 ft. 2 in
Scarifying depth, maximum	6.5 in
Scarifier shank holders	9
Scarifier shank holders spacing	10.5 in

Engine and its related items:

Accelerator and electric throttle control
Air cleaner, double element with dust indicator
Air intake extension
Antifreeze -22 F(-30C)
Auto-idle Shutdown
Hydraulic driven, reversing, cooling fan, blower type, plastic blade, with fan guard
Engine, Komatsu SAA6D107E-3, 145 to 218 VHP EPA Tier 4 Final certified, turbocharged and air-air after cooled
Fuel line pre-filter
KDPF - After-Treatment Assembly Consisting of KDOC and KCSF
Secondary Engine Shutdown Switch
Selective Catalytic Reduction (SCR) System

Electrical system:

Alarm, backup
Alternator, 140 Ampere, (24V)
Batteries, Extreme duty, 2 x 12V, 1146 cca each
Battery, disconnect switch
Dome light cab
Headlights,(2) halogen type, front bar mounted
Horn, electric
Indicator lights:
- Battery charge
- Blade float
- Brake oil pressure
- Cooling fan reverse mod
- Differential lock
- Differential oil temperatur
- Dual power mode, economy and power
- Engine oil pressure
- Engine RPM set
- Lift arm lock
- Lights, high beam
- Parking break
- Transmission system electrical circuit
Lights, backup, stop, directional
Starter 5.5kW
Working light, front(4) and rear(2)
Working light ,(4)cab mounted flood type

Operator environment:

12V (10A) power port
Air conditioner (R134a) with heater
AM/FM radio
Cab: low profile with ROPS/FOPS Level II (SAE J1040, J2311)
Console, adjustable with instrument panel monitoring system
Electric defroster rear window
Mirrors: interior cab, right and left exterior mirrors
Electric defroster rear window
Mirrors: interior cab, right and left exterior mirrors
Multi-monitor with 7" LCD Display
Rearview Camera and Monitor
Sound suppression,74 Dba at operators ear with floor mat with tinted windows, front, rear and door intermittent wiper/washers

Power Train

Dual mode transmission (8F-4R) power shift direct drive and torque converter with auto shift
Axle, rear full floating, planetary type reduction
Service brakes, fully hydraulic wet disc
Parking brake, spring apply, hydraulic release dry disc
Differential, manual lock/unlock
Tires and rims: 17.5R25 radials on one-piece 13" rims (6)

Work Equipment and Hydraulics

Blade accumulators
Blade lift float, detent type, LH and RH
Circle, drawbar mounted, 360° rotation with blade lift and circle side shift with anti-drift check valves
Circle slip clutch
Greaseless circle wear plates
Hydraulic control valve, 10 valve section with control levers
Hydraulic system, closed center, load sensing
Steering, full hydraulic with tilt steering wheel plus leaning front wheels and frame articulation with anti-drift check valves

Other Standard Equipment

Komtrax - Level 5
Precleaner, Turbo II
Provision for Grade Control, TOPCON
Rear hitch
Ripper, provision for battery cover and engine side covers
Steps and handrails, right, left and rear
Toolbox with lock
Vandalism protection, lockable fuel tank, hydraulic tank