Machine models

Komatsu GD600R-2 to GD655R-2 specifications

Entries in this reference
Listing-entry count
6

Short answer

Komatsu GD600R-2 to GD655R-2: motor graders.

Selected configuration figures
Configuration	Documented field and quantity
GD600R-2	Max Power 145 hp Std Operation Weight - Total 27,227 lb
GD605A-2	Net Power Gear 5-6 145 hp Std Operation Weight - Total 28,726 lb
GD605R-2	Net Power Gear 5-6 145 hp Std Operation Weight - Total 27,889 lb
GD650R-2	Max Power 165 hp Std Operation Weight - Total 27,624 lb
GD655A-2	Net Power Gear 5-6 165 hp Std Operation Weight - Total 29,101 lb
GD655R-2	Net Power Gear 5-6 165 hp Std Operation Weight - Total 28,285 lb

GD600R-2 to GD655R-2 specification matrix — Listing labels reported by the source
Publisher name	Source guide	Listing-entry count	Labels named by the source
Komatsu	GD600R-2 to GD655R-2	6	GD600R-2, GD605A-2, GD605R-2, GD650R-2, GD655A-2, and GD655R-2

Dimensions and weight
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Overall Length	27.61 ft	27.61 ft	27.61 ft	27.61 ft	27.61 ft	27.61 ft
Wheelbase	19.69 ft	19.69 ft	19.69 ft	19.69 ft	19.69 ft	19.69 ft
Rear Ground Clearance	1.12 ft	1.09 ft	1.09 ft	1.09 ft	1.09 ft	1.09 ft
Tandem Axle Wheelbase	4.98 ft	4.98 ft	4.98 ft	4.98 ft	4.98 ft	4.98 ft
Front Ground Clearance	1.99 ft	1.99 ft	1.99 ft	1.99 ft	1.99 ft	1.99 ft
Blade Base	8.85 ft	8.85 ft	8.85 ft	8.85 ft	8.85 ft	8.85 ft
Height To Top Of Isomount Cab	10.5 ft	19.69 ft	11 ft	10.5 ft	19.69 ft	11 ft

Engine
Specification	GD600R-2	GD650R-2
Net Power Gear 4-6	145 hp	165 hp
Net Torque Gears 3-4	528 lb-ft	550 lb-ft

Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Engine Model	Cummins NH220-CI	NH220-CI	NH220-CI	Cummins NH220-CI	NH220-CI	NH220-CI
Max Power	145 hp	145 hp	145 hp	165 hp	165 hp	165 hp
Displacement	743 cu in	743 cu in	742 cu in	743 cu in	743 cu in	742 cu in

Specification	GD605A-2	GD605R-2	GD655A-2	GD655R-2
Net Power Gear 5-6	145 hp	145 hp	165 hp	165 hp
Net Torque Gears 5-6	528 lb-ft	528 lb-ft	550 lb-ft	550 lb-ft

Operational
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Std Operation Weight - Front Axle	7,760 lb	7,915 lb	7,827 lb	7,981 lb	8,135 lb	8,047 lb
Std Operation Weight - Rear Axle	19,467 lb	20,812 lb	20,062 lb	19,643 lb	20,966 lb	20,239 lb
Std Operation Weight - Total	27,227 lb	28,726 lb	27,889 lb	27,624 lb	29,101 lb	28,285 lb
Tire Size	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR

Steering
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Turning Radius	34.2 ft	22.7 ft	34.2 ft	34.2 ft	22.7 ft	34.2 ft

Specification	GD605A-2	GD655A-2
Articulation Angle	25 degrees	25 degrees

Transmission and speeds
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Transmission Type	constant mesh	Hydroshift	Hydroshift	constant mesh	Hydroshift	Hydroshift
Number Of Gears - Forward	4	6	6	4	6	6
Number Of Gears - Reverse	4	6	6	4	6	6
Max Speed - Forward	12.5 mph	27.1 mph	27.1 mph	27.9 mph	27.1 mph	27.1 mph
Max Speed - Reverse	14.7 mph	32.1 mph	32.1 mph	14.7 mph	32.1 mph	32.1 mph

Front Axle
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Wheel Lean	23 degrees	23 degrees	23 degrees	23 degrees	23 degrees	23 degrees
Oscillation - Total	30 degrees	30 degrees	30 degrees	30 degrees	30 degrees	30 degrees
Ground Clearance	2 ft	2 ft	2 ft	2 ft	2 ft	2 ft

Moldboard
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Moldboard Width	12.2 ft	12.2 ft	12.2 ft	13.2 ft	13.2 ft	13.2 ft
Moldboard Height	25.8 in	25.8 in	25.8 in	25.8 in	25.8 in	25.8 in
Moldboard Thickness	0.8 in	0.8 in	0.8 in	0.8 in	0.8 in	0.8 in
Max Depth Of Cut	22.5 in	22.5 in	22.5 in	22.5 in	22.5 in	22.5 in

Circle
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Max Reach Outside Tires - Left	83.3 in	83.3 in	83.3 in	94.9 in	94.9 in	94.9 in
Max Reach Outside Tires - Right	81 in	81 in	81 in	92.6 in	92.6 in	92.6 in
Max Lift Above Ground	15.8 in	15.8 in	15.8 in	15.8 in	15.8 in	15.8 in

Variants — Source comparison annotation
Source guide	Differing-field count reported
GD600R-2 to GD655R-2	22

Ratios
Figure	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Engine horsepower per 1,000 lb of weight	5.3	5.0	5.2	6.0	5.7	5.8

Reference directory classification
Equipment group	motor grader

GD600R-2 to GD655R-2: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	motor grader	Komatsu and the GD655 line that the GD655A-2, GD655R-2 belongs to (no title names the exact model)	6

Topics named by those titles
Title topic	Titles
starting and cranking	2

Topic in the title	Threads	Share of matching threads
starting and cranking	2	33%

Komatsu Gd655 3c Is Joystick Repair (Heavy Equipment Forums, 2026-02-16)
Komatsu Gd655 Crank No Start (Heavy Equipment Forums, 2024-10-16)
Komatsu Gd655 6 (Heavy Equipment Forums, 2018-06-11)

GD600R-2 to GD655R-2: dated market and recall observations — Dated listing search
Date	Listing index	Equipment class	Names queried	Result
2026-09-24	MachineryTrader (machinerytrader.com)	motor grader	GD600R-2, GD605A-2, GD605R-2	No matching offers in this snapshot

Dated CPSC search
Date	Database	Names queried	Result
2026-09-24	U.S. Consumer Product Safety Commission	Komatsu; GD600R-2, GD605A-2, GD605R-2	No matching recall in the stated search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Komatsu GD600R-2 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu GD605A-2 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu GD605R-2 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu GD650R-2 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu GD655A-2 — RitchieSpecs. Observed 2026-09-24.
Reference site	Reference site: Komatsu GD655R-2 — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Komatsu GD600R-2 to GD655R-2 — Heavy Equipment Forums. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Komatsu — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Komatsu GD600R-2 to GD655R-2: Configuration records

GD600R-2

Specification	Source figure
Dimensions and weight
Overall Length	27.61 ft
Wheelbase	19.69 ft
Rear Ground Clearance	1.12 ft
Tandem Axle Wheelbase	4.98 ft
Blade Base	8.85 ft
Height To Top Of Isomount Cab	10.5 ft
Front Ground Clearance	1.99 ft
Engine
Engine Model	Cummins NH220-CI
Max Power	145 hp
Displacement	743 cu in
Net Power Gear 4-6	145 hp
Net Torque Gears 3-4	528 lb-ft
Operational
Std Operation Weight - Total	27,227 lb
Tire Size	13.00-24-10PR
Std Operation Weight - Front Axle	7,760 lb
Std Operation Weight - Rear Axle	19,467 lb
Steering
Turning Radius	34.2 ft
Transmission and speeds
Number Of Gears - Forward	4
Max Speed - Forward	12.5 mph
Max Speed - Reverse	14.7 mph
Transmission Type	constant mesh
Number Of Gears - Reverse	4
Front Axle
Ground Clearance	2 ft
Wheel Lean	23 degrees
Oscillation - Total	30 degrees
Moldboard
Moldboard Width	12.2 ft
Moldboard Height	25.8 in
Moldboard Thickness	0.8 in
Max Depth Of Cut	22.5 in
Circle
Max Reach Outside Tires - Left	83.3 in
Max Reach Outside Tires - Right	81 in
Max Lift Above Ground	15.8 in

Source

GD605A-2

Specification	Source figure
Dimensions and weight
Overall Length	27.61 ft
Wheelbase	19.69 ft
Rear Ground Clearance	1.09 ft
Tandem Axle Wheelbase	4.98 ft
Blade Base	8.85 ft
Height To Top Of Isomount Cab	19.69 ft
Front Ground Clearance	1.99 ft
Engine
Engine Model	NH220-CI
Net Power Gear 5-6	145 hp
Max Power	145 hp
Displacement	743 cu in
Net Torque Gears 5-6	528 lb-ft
Operational
Std Operation Weight - Total	28,726 lb
Tire Size	13.00-24-10PR
Std Operation Weight - Front Axle	7,915 lb
Std Operation Weight - Rear Axle	20,812 lb
Steering
Articulation Angle	25 degrees
Turning Radius	22.7 ft
Transmission and speeds
Number Of Gears - Forward	6
Max Speed - Forward	27.1 mph
Max Speed - Reverse	32.1 mph
Transmission Type	Hydroshift
Number Of Gears - Reverse	6
Front Axle
Ground Clearance	2 ft
Wheel Lean	23 degrees
Oscillation - Total	30 degrees
Moldboard
Moldboard Width	12.2 ft
Moldboard Height	25.8 in
Moldboard Thickness	0.8 in
Max Depth Of Cut	22.5 in
Circle
Max Reach Outside Tires - Left	83.3 in
Max Reach Outside Tires - Right	81 in
Max Lift Above Ground	15.8 in

Source

GD605R-2

Specification	Source figure
Dimensions and weight
Overall Length	27.61 ft
Wheelbase	19.69 ft
Rear Ground Clearance	1.09 ft
Tandem Axle Wheelbase	4.98 ft
Blade Base	8.85 ft
Height To Top Of Isomount Cab	11 ft
Front Ground Clearance	1.99 ft
Engine
Engine Model	NH220-CI
Net Power Gear 5-6	145 hp
Max Power	145 hp
Displacement	742 cu in
Net Torque Gears 5-6	528 lb-ft
Operational
Std Operation Weight - Total	27,889 lb
Tire Size	13.00-24-10PR
Std Operation Weight - Front Axle	7,827 lb
Std Operation Weight - Rear Axle	20,062 lb
Steering
Turning Radius	34.2 ft
Transmission and speeds
Number Of Gears - Forward	6
Max Speed - Forward	27.1 mph
Max Speed - Reverse	32.1 mph
Transmission Type	Hydroshift
Number Of Gears - Reverse	6
Front Axle
Ground Clearance	2 ft
Wheel Lean	23 degrees
Oscillation - Total	30 degrees
Moldboard
Moldboard Width	12.2 ft
Moldboard Height	25.8 in
Moldboard Thickness	0.8 in
Max Depth Of Cut	22.5 in
Circle
Max Reach Outside Tires - Left	83.3 in
Max Reach Outside Tires - Right	81 in
Max Lift Above Ground	15.8 in

Source

GD650R-2

Specification	Source figure
Dimensions and weight
Overall Length	27.61 ft
Wheelbase	19.69 ft
Rear Ground Clearance	1.09 ft
Tandem Axle Wheelbase	4.98 ft
Blade Base	8.85 ft
Height To Top Of Isomount Cab	10.5 ft
Front Ground Clearance	1.99 ft
Engine
Engine Model	Cummins NH220-CI
Max Power	165 hp
Displacement	743 cu in
Net Power Gear 4-6	165 hp
Net Torque Gears 3-4	550 lb-ft
Operational
Std Operation Weight - Total	27,624 lb
Tire Size	13.00-24-10PR
Std Operation Weight - Front Axle	7,981 lb
Std Operation Weight - Rear Axle	19,643 lb
Steering
Turning Radius	34.2 ft
Transmission and speeds
Number Of Gears - Forward	4
Max Speed - Forward	27.9 mph
Max Speed - Reverse	14.7 mph
Transmission Type	constant mesh
Number Of Gears - Reverse	4
Front Axle
Ground Clearance	2 ft
Wheel Lean	23 degrees
Oscillation - Total	30 degrees
Moldboard
Moldboard Width	13.2 ft
Moldboard Height	25.8 in
Moldboard Thickness	0.8 in
Max Depth Of Cut	22.5 in
Circle
Max Reach Outside Tires - Left	94.9 in
Max Reach Outside Tires - Right	92.6 in
Max Lift Above Ground	15.8 in

Source

GD655A-2

Specification	Source figure
Dimensions and weight
Overall Length	27.61 ft
Wheelbase	19.69 ft
Rear Ground Clearance	1.09 ft
Tandem Axle Wheelbase	4.98 ft
Blade Base	8.85 ft
Height To Top Of Isomount Cab	19.69 ft
Front Ground Clearance	1.99 ft
Engine
Engine Model	NH220-CI
Net Power Gear 5-6	165 hp
Max Power	165 hp
Displacement	743 cu in
Net Torque Gears 5-6	550 lb-ft
Operational
Std Operation Weight - Total	29,101 lb
Tire Size	13.00-24-10PR
Std Operation Weight - Front Axle	8,135 lb
Std Operation Weight - Rear Axle	20,966 lb
Steering
Articulation Angle	25 degrees
Turning Radius	22.7 ft
Transmission and speeds
Number Of Gears - Forward	6
Max Speed - Forward	27.1 mph
Max Speed - Reverse	32.1 mph
Transmission Type	Hydroshift
Number Of Gears - Reverse	6
Front Axle
Ground Clearance	2 ft
Wheel Lean	23 degrees
Oscillation - Total	30 degrees
Moldboard
Moldboard Width	13.2 ft
Moldboard Height	25.8 in
Moldboard Thickness	0.8 in
Max Depth Of Cut	22.5 in
Circle
Max Reach Outside Tires - Left	94.9 in
Max Reach Outside Tires - Right	92.6 in
Max Lift Above Ground	15.8 in

Source

GD655R-2

Specification	Source figure
Dimensions and weight
Overall Length	27.61 ft
Wheelbase	19.69 ft
Rear Ground Clearance	1.09 ft
Tandem Axle Wheelbase	4.98 ft
Blade Base	8.85 ft
Height To Top Of Isomount Cab	11 ft
Front Ground Clearance	1.99 ft
Engine
Engine Model	NH220-CI
Net Power Gear 5-6	165 hp
Max Power	165 hp
Displacement	742 cu in
Net Torque Gears 5-6	550 lb-ft
Operational
Std Operation Weight - Total	28,285 lb
Tire Size	13.00-24-10PR
Std Operation Weight - Front Axle	8,047 lb
Std Operation Weight - Rear Axle	20,239 lb
Steering
Turning Radius	34.2 ft
Transmission and speeds
Number Of Gears - Forward	6
Max Speed - Forward	27.1 mph
Max Speed - Reverse	32.1 mph
Transmission Type	Hydroshift
Number Of Gears - Reverse	6
Front Axle
Ground Clearance	2 ft
Wheel Lean	23 degrees
Oscillation - Total	30 degrees
Moldboard
Moldboard Width	13.2 ft
Moldboard Height	25.8 in
Moldboard Thickness	0.8 in
Max Depth Of Cut	22.5 in
Circle
Max Reach Outside Tires - Left	94.9 in
Max Reach Outside Tires - Right	92.6 in
Max Lift Above Ground	15.8 in

Source

Compare Komatsu GD600R-2, GD605A-2, GD605R-2, GD650R-2, GD655A-2, GD655R-2

Dimensions and weight
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Overall Length	27.61 ft	27.61 ft	27.61 ft	27.61 ft	27.61 ft	27.61 ft
Wheelbase	19.69 ft	19.69 ft	19.69 ft	19.69 ft	19.69 ft	19.69 ft
Rear Ground Clearance	1.12 ft	1.09 ft	1.09 ft	1.09 ft	1.09 ft	1.09 ft
Tandem Axle Wheelbase	4.98 ft	4.98 ft	4.98 ft	4.98 ft	4.98 ft	4.98 ft
Front Ground Clearance	1.99 ft	1.99 ft	1.99 ft	1.99 ft	1.99 ft	1.99 ft
Blade Base	8.85 ft	8.85 ft	8.85 ft	8.85 ft	8.85 ft	8.85 ft
Height To Top Of Isomount Cab	10.5 ft	19.69 ft	11 ft	10.5 ft	19.69 ft	11 ft

Engine
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Engine Model	Cummins NH220-CI	NH220-CI	NH220-CI	Cummins NH220-CI	NH220-CI	NH220-CI
Max Power	145 hp	145 hp	145 hp	165 hp	165 hp	165 hp
Displacement	743 cu in	743 cu in	742 cu in	743 cu in	743 cu in	742 cu in

Operational
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Std Operation Weight - Front Axle	7,760 lb	7,915 lb	7,827 lb	7,981 lb	8,135 lb	8,047 lb
Std Operation Weight - Rear Axle	19,467 lb	20,812 lb	20,062 lb	19,643 lb	20,966 lb	20,239 lb
Std Operation Weight - Total	27,227 lb	28,726 lb	27,889 lb	27,624 lb	29,101 lb	28,285 lb
Tire Size	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR	13.00-24-10PR

Steering
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Turning Radius	34.2 ft	22.7 ft	34.2 ft	34.2 ft	22.7 ft	34.2 ft

Transmission and speeds
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Transmission Type	constant mesh	Hydroshift	Hydroshift	constant mesh	Hydroshift	Hydroshift
Number Of Gears - Forward	4	6	6	4	6	6
Number Of Gears - Reverse	4	6	6	4	6	6
Max Speed - Forward	12.5 mph	27.1 mph	27.1 mph	27.9 mph	27.1 mph	27.1 mph
Max Speed - Reverse	14.7 mph	32.1 mph	32.1 mph	14.7 mph	32.1 mph	32.1 mph

Front Axle
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Wheel Lean	23 degrees	23 degrees	23 degrees	23 degrees	23 degrees	23 degrees
Oscillation - Total	30 degrees	30 degrees	30 degrees	30 degrees	30 degrees	30 degrees
Ground Clearance	2 ft	2 ft	2 ft	2 ft	2 ft	2 ft

Moldboard
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Moldboard Width	12.2 ft	12.2 ft	12.2 ft	13.2 ft	13.2 ft	13.2 ft
Moldboard Height	25.8 in	25.8 in	25.8 in	25.8 in	25.8 in	25.8 in
Moldboard Thickness	0.8 in	0.8 in	0.8 in	0.8 in	0.8 in	0.8 in
Max Depth Of Cut	22.5 in	22.5 in	22.5 in	22.5 in	22.5 in	22.5 in

Circle
Specification	GD600R-2	GD605A-2	GD605R-2	GD650R-2	GD655A-2	GD655R-2
Max Reach Outside Tires - Left	83.3 in	83.3 in	83.3 in	94.9 in	94.9 in	94.9 in
Max Reach Outside Tires - Right	81 in	81 in	81 in	92.6 in	92.6 in	92.6 in
Max Lift Above Ground	15.8 in	15.8 in	15.8 in	15.8 in	15.8 in	15.8 in

More in Komatsu: GD555-3–GD675-5, GD530A-2C–GD670AW-2C, GD705R-2.

Komatsu GD600R-2 to GD655R-2 specifications

Sources for this page

Komatsu GD600R-2 to GD655R-2: Configuration records