• 38,250 lbs Operating Weight
  • 218 @2100 rpm Horsepower
  • 14' Moldboard


The GD655-7 provides operators with an all new, ergonomic working environment and the new spacious cab allows more room for operators working long days. Operators will appreciate the new low-effort equipment and steering levers, new transmission controls and articulation stop-at-center feature. Collectively, they significantly reduce operator fatigue.

GD655-7 Walkaround  >


New Cab Enhancements

  • Slightly smaller but “right sized” steering wheel provides more visibility and operator room in the cab, convenient for those long, “blade-up and roading” trips
  • New steering lever allows the operator to keep hands on the low-effort, work equipment levers and make small steering adjustments, while operating without needing to turn the steering wheel
  • New multi-position adjustable arm rests and LH/RH consoles have power raise/lower and mechanical fore/aft adjustments to precisely adjust to operator preferences.
  • New, high-capacity, air-suspension seat softens in-cab machine vibrations for operator
  • New stop-at-center articulation feature simplifies operation
  • New operator presence monitoring system alerts the operator if they leave the seat and controls are not locked out properly

Under The Hood

  • A powerful 218 HP (163 kW), EPA Tier 4 Final certified, SAA6D107E-3 engine
  • 2-mode, 3-stage Variable Horsepower Control (VHPC) allows the selection of the appropriate mode, economy or power, to match operating parameters to application requirements for optimal fuel savings
  • Komatsu Diesel Particulate Filter (KDPF) and other after treatment components are designed in conjunction with the engine for efficiency and long life
  • More than 98 percent of KDPF regeneration is performed passively, with no action required of the operator and no interference with machine operation

Power Train Performance

  • New transmission shift lever with finger-operated forward-neutral-reverse switch simplifies operation and dramatically reduces required hand movement
  • Komatsu power shift transmission designed and built specifically for Komatsu graders provides on-the-go, full power shifting, as well as inching capability and automatic shifting in the higher ranges
  • Industry exclusive, dual-mode transmission (8 forward, 4 reverse) allows operators to benefit from the high travel speeds and reduced fuel consumption of a direct drive, as well as the increased tractive effort and control of a torque converter
  • An inching pedal gives the operator precise control of machine movement
  • Full locking differential provides the traction required in the most severe operating conditions

Other Standard Value Features Included

  • Grade control, TOPCON 3DMC plug-and-play ready, with no aftermarket valve required
  • Two, five-section hydraulic control valves are standard enabling the addition of attachments and is strategically located to improve forward visibility
  • Closed-center Load Sensing (CLSS) hydraulic system, with variable displacement pump, supplies flow and pressure only when required, resulting in less heat and lower fuel consumption
  • Blade lift accumulators absorb shocks when the moldboard hits immovable objects
  • Circle slip clutch, for accidental contact with hidden objects with the moldboard
  • Greaseless circle wear plates for long life
  • Independent blade lift float
  • AM/FM radio with auxiliary input jack and two 12-volt ports
  • Seven-inch, full color, high resolution monitor with Ecology Guidance
  • Separate, full color, rearview monitoring system
  • Pioneering KOMTRAX telematics system and monitor, providing machine metrics, including KDPF status and DEF-level data, fuel consumption, plus performance information collected and sorted by operator ID
  • Komatsu Auto Idle Shutdown to reduce idle time and save fuel

Serviceability / Komatsu CARE

  • Reversible, variable speed hydraulic fan to blow out dust accumulation in the cooler
  • Completely sealed and adjustment-free hydraulically actuated, wet, disc brakes
  • Ground level access to fuel and DEF fill
  • Easily accessible engine and hydraulic oil, and coolant drains
  • All Komatsu GD655-7 units come with Komatsu CARE. Komatsu CARE provides scheduled factory maintenance for the first 2,000 hours or three years including a 50-point inspection at each service, and two complimentary KDPF exchanges in the first five years.



Model SAA6D107E-3*
Type Water-cooled, 4-cycle, direct injection
Aspiration Turbocharged, aftercooled, cooled EGR
Number of cylinders 6
Bore 107 mm 4.21"
Stroke 124 mm 4.88"
Piston displacement 6.69 ltr 408 in3
Gross horsepower (Manual mode):    
        Gear 1-3 @2000 rpm 136 kW 183 HP
        Gear 4-6 @2000 rpm 151 kW 203 HP
        Gear 7-8 @2100 rpm 165 kW 221 HP
        Gear 1-6 @2000 rpm 136 kW 183 HP
        Gear 7-8 @2000 rpm 165 kW 221 HP
Net horsepower (Manual mode)**    
        Gear 1-3 @2000 rpm 134 kW 180 HP
        Gear 4-6 @2000 rpm 149 kW 200 HP
        Gear 7-8 @2100 rpm 163 kW 218 HP
        Gear 1-6 @2000 rpm 134 kW 180 HP
        Gear 7-8 @2000 rpm 163 kW 218 HP
Max. torque @1450 rpm 941 Nm 96.0 kg•m 694 lb.ft.
Torque rise 30 %
Fan speed Max. 1450 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 km/h
2.1 mph
4.5 km/h
2.8 mph
2nd 5.0 km/h
3.1 mph
9.2 km/h
5.7 mph
3rd 7.0 km/h
4.3 mph
20.3 km/h
12.6 mph
4th 10.2 km/h
6.3 mph
40.3 km/h
25.0 mph
5th 15.4 km/h
9.6 mph
6th 22.3 km
13.9 mph
7th 30.6 km/h
19.0 mph
8th 44.3 km/h
27.5 mph

Tandem Drive

Oscillating welded box section 520 mm x 202 mm 1'8" x 8"
Side wall thickness:    
    Inner 22 mm 0.87"
    Outer 19 mm 0.75"
Wheel axle spacing 1525 mm 5'0"
Tandem oscillation 11° forward 13° reverse
Tank 7 L 1.8 U.S. gal

Front Axle

Type Solid bar construction welded steel sections
Ground clearance at pivot 620 mm 2'0"
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" one-piece rims


Hydraulic power steering providing stopped engine steering meeting ISO 5010.
Minimum turning radius 7.4 m 24'3"
Maximum steering range, right or left 49°
Articulation, right or left 25°


Service brake Foot operated, sealed oil disc brakes, hydraulically actuated on four tandem wheels.
Parking brake Manually actuated, spring applied, hydraulically released caliper.


Front Frame Structure    
    Height 300 mm 11.8"
    Width 300 mm 11.8"
    Upper, Lower 25 mm 1.0"


A-shaped, u-section press formed and welded construction for maximum strength with a replaceable drawbar ball.
Drawbar frame 210 x 22 mm 8.3" x 0.87"


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

Diameter (outside) 1530 mm 5'0"
Circle reversing control hydraulic rotation 360°


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 4320 x 660 x 22 mm 14' x 26" x 0.87"
Arc radius 432 mm 1'5"
Cutting edge 152 x 16 mm 6" x 0.63"
Replaceable/Reversible side edges 156 x 16 x 456 mm 6' x 0.63" x 1'6"
Blade pull:    
    Base GVW 10100 kg 22,267 lbs
    With ripper GVW 10980 kg 24,207 lbs
Blade down pressure:    
    Base GVW 6940 kg 15,300 lbs
    With ripper GVW 8400 kg 18,519 lbs

Blade Range

Moldboard side shift:    
    Right 820 mm 2'8"
    Left 820 mm 2'8"
Maximum shoulder reach outside rear tires
(frame straight)
    Right 2000 mm 6'7"
    Left 2000 mm 6'7"
Maximum lift above ground 480 mm 1'7"
Maximum cutting depth 615 mm 2'0"
Maximum blade angle, right or left 90°
Blade tip angle 40° forward 5° backward


Load-sensing closed center hydraulics with variable displacement piston pump. Electronic proportional controlled 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 52.8 u.s.gal/min
Standby pressure 3.4 MPa 35 kg/cm2 500 psi
Maximum system pressure 20.6 MPa 210 kg/cm2 3,000 psi


Electric monitoring system with diagnostics:


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 ltr 103 u.s. gal
Cooling system 30 ltr 7.9 u.s. gal
Crank case 23 ltr 6.1 u.s. gal
Transmission 45 ltr 11.9 u.s. gal
Final drive 17 ltr 4.5 u.s. gal
Tandem housing (each) 57 lt 15.1 u.s. gal
Hydraulic system 69 ltr 18.2 u.s. gal
Circle reverse housing 7 ltr 1.8 u.s. gal

Operating Weight (approximate)

Includes lubricants, coolant, full fuel tank
Total 17300 kg
38,140 lbs
With rear mounted ripper and front push plate:    
Total 19260 kg
41,667 lbs


Ripping depth, maximum 425 mm 1'5"
Ripper shank holders 5
Ripper shank holder spacing 534 mm 1'9"
Penetration force 9390 kg 20,701 lbs
Pryout force 17600 kg 38,801 lbs
Machine length increase,beam raised 690 mm 2'5"


Middle, V-type:    
    Working width 1430 mm 4'8"
    Scarifying depth, maximum 190 mm 7.5"
    Scarifier shank holders 11
    Scarifier shank holders spacing 138 mm 5.4"
    Working width 2186 mm 7'2"
    Scarifying depth, maximum 165 mm 6.5"
    Scarifier shank holders 9
    Scarifier shank holders spacing 267 mm 10.5"


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
  • Adjustable air suspension seat
  • Adjustable tilt/telescopic steering wheel
  • Air conditioner (R134a) with heater
  • AM/FM radio with Aux input and USB port
  • Cab: low profile with ROPS/FOPS Level II (SAE J1040, J2311)
  • Console, adjustable with instrument panel monitoring system
  • Electric defroster rear window
  • Electronic height adjustable LH and RH consoles
  • Mirrors: interior cab, right and left exterior mirrors
  • Multi-monitor with 7" LCD Display
  • Rearview Camera and Monitor
  • Sound suppression, 72 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
  • Electronic gear shift lever
  • 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
  • Low-effort electronic proportional control levers (joysticks)
  • Greaseless circle wear plates
  • Hydraulic control valve, 2-5 valve sections
  • 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. Steering lever/joystick provided

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


  • Moldboard:
    --3710 mm x 660 mm x 22 mm
    12' x 26" x 0.87" with replaceable end bits
    --152 mm x 16 mm
    6" x 0.63" through-hardened cutting edges  and 5/8" hardware
  • Pusher plate (for use with rear mounted ripper/scarifier assembly)
  • Rear-mounted ripper/scarifier assembly includes (3) shanks or (9) scarifier shanks can be inserted into the available slots
  • Mid-mounted scarifier assembly (includes 11 shanks and replaceable points)
  • Amber colored warning light
  • 610 mm 2' LH/RH moldboard extensions
  • Kit provision for a single function front attachment
  • Winter tires