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Komatsu GD31RC-3A and GD405A-1 specifications

Entries in this reference
Listing-entry count
2
Short answer

Komatsu GD31RC-3A and GD405A-1: motor graders.

Selected configuration figures
ConfigurationDocumented field and quantity
GD31RC-3A
Net Power Gear 5-6
110 hp
Std Operation Weight - Front Axle
5,269 lb
GD405A-1
Net Power Gear 5-6
110 hp
Std Operation Weight - Front Axle
5,622 lb
GD31RC-3A and GD405A-1 specification matrix — Listing labels reported by the source
Publisher nameSource guideListing-entry countLabels named by the source
KomatsuGD31RC-3A and GD405A-12GD31RC-3A and GD405A-1
Dimensions and weight
SpecificationGD31RC-3AGD405A-1
Overall Length22.18 ft23.05 ft
Width Over Tires6.83 ft7.11 ft
Wheelbase16.08 ft16.08 ft
Rear Ground Clearance1.15 ft0.99 ft
Tandem Axle Wheelbase3.94 ft4.29 ft
Front Ground Clearance1.43 ft1.43 ft
Height To Top Of Isomount Cab10.37 ft10.88 ft
SpecificationGD405A-1
Blade Base6.89 ft
Engine
SpecificationGD31RC-3AGD405A-1
Engine Model4D1306D105
Net Power Gear 5-6110 hp110 hp
Max Power110 hp110 hp
Net Torque Gears 5-6375 lb-ft282 lb-ft
Displacement518 cu in396 cu in
Operational
SpecificationGD31RC-3AGD405A-1
Std Operation Weight - Front Axle5,269 lb5,622 lb
Std Operation Weight - Rear Axle14,418 lb13,955 lb
Std Operation Weight - Total19,687 lb19,577 lb
Tire Sizefront 9.00-20-10PR, rear 11.00-20-10PRfront 9.00-20-10PR, rear 11.00-20-10PR
Steering
SpecificationGD31RC-3AGD405A-1
Turning Radius29.6 ft18.4 ft
SpecificationGD405A-1
Articulation Angle27 degrees
Transmission and speeds
SpecificationGD31RC-3AGD405A-1
Transmission Typesliding mesh and constant mesh combinedhydroshift
Number Of Gears - Forward66
Number Of Gears - Reverse26
Max Speed - Forward23.8 mph26.1 mph
Max Speed - Reverse7.3 mph28 mph
Front Axle
SpecificationGD31RC-3AGD405A-1
Wheel Lean25 degrees22 degrees
Oscillation - Total26 degrees26 degrees
Ground Clearance1.5 ft1.5 ft
Moldboard
SpecificationGD31RC-3AGD405A-1
Moldboard Width10.2 ft10.2 ft
Moldboard Height20.5 in24.7 in
Moldboard Thickness0.5 in0.8 in
Max Depth Of Cut17 in17.4 in
Circle
SpecificationGD31RC-3AGD405A-1
Max Reach Outside Tires - Left61.3 in54 in
Max Reach Outside Tires - Right61.3 in56 in
Max Lift Above Ground18.2 in14.2 in
Variants — Source comparison annotation
Source guideDiffering-field count reported
GD31RC-3A and GD405A-125
Ratios
FigureGD31RC-3AGD405A-1
Engine horsepower per 1,000 lb of weight5.65.6
Reference directory classification
Equipment groupmotor grader
GD31RC-3A and GD405A-1: forum references — Forum-title search
Forum indexEquipment class queriedNames in the searchMatching titles
Heavy Equipment Forumsmotor graderKomatsu and the GD405A line that the GD405A-1 belongs to (no title names the exact model). That is too few titles to say what owners mostly ask about, so the most recent are listed instead1
GD31RC-3A and GD405A-1: dated market and recall observations — Dated listing search
DateListing indexEquipment classNames queriedResult
2026-09-24MachineryTrader (machinerytrader.com)motor graderGD31RC-3A, GD405A-1No matching offers in this snapshot
Dated CPSC search
DateDatabaseNames queriedResult
2026-09-24U.S. Consumer Product Safety CommissionKomatsu; GD31RC-3A, GD405A-1No matching recall in the stated search

Sources for this page

Evidence classDocument, classification and recorded date
Reference site
Reference site
Forum threads
Federal agency data

Komatsu GD31RC-3A and GD405A-1: Configuration records

GD31RC-3A
SpecificationSource figure
Dimensions and weight
Overall Length22.18 ft
Wheelbase16.08 ft
Rear Ground Clearance1.15 ft
Front Ground Clearance1.43 ft
Height To Top Of Isomount Cab10.37 ft
Width Over Tires6.83 ft
Tandem Axle Wheelbase3.94 ft
Engine
Engine Model4D130
Net Power Gear 5-6110 hp
Max Power110 hp
Net Torque Gears 5-6375 lb-ft
Displacement518 cu in
Operational
Std Operation Weight - Front Axle5,269 lb
Std Operation Weight - Rear Axle14,418 lb
Std Operation Weight - Total19,687 lb
Tire Sizefront 9.00-20-10PR, rear 11.00-20-10PR
Steering
Turning Radius29.6 ft
Transmission and speeds
Number Of Gears - Forward6
Number Of Gears - Reverse2
Max Speed - Forward23.8 mph
Max Speed - Reverse7.3 mph
Transmission Typesliding mesh and constant mesh combined
Front Axle
Oscillation - Total26 degrees
Ground Clearance1.5 ft
Wheel Lean25 degrees
Moldboard
Moldboard Width10.2 ft
Moldboard Height20.5 in
Moldboard Thickness0.5 in
Max Depth Of Cut17 in
Circle
Max Reach Outside Tires - Left61.3 in
Max Reach Outside Tires - Right61.3 in
Max Lift Above Ground18.2 in

Source

GD405A-1
SpecificationSource figure
Dimensions and weight
Overall Length23.05 ft
Wheelbase16.08 ft
Rear Ground Clearance0.99 ft
Front Ground Clearance1.43 ft
Blade Base6.89 ft
Height To Top Of Isomount Cab10.88 ft
Width Over Tires7.11 ft
Tandem Axle Wheelbase4.29 ft
Engine
Engine Model6D105
Net Power Gear 5-6110 hp
Max Power110 hp
Net Torque Gears 5-6282 lb-ft
Displacement396 cu in
Operational
Std Operation Weight - Front Axle5,622 lb
Std Operation Weight - Rear Axle13,955 lb
Std Operation Weight - Total19,577 lb
Tire Sizefront 9.00-20-10PR, rear 11.00-20-10PR
Steering
Articulation Angle27 degrees
Turning Radius18.4 ft
Transmission and speeds
Number Of Gears - Forward6
Number Of Gears - Reverse6
Max Speed - Forward26.1 mph
Max Speed - Reverse28 mph
Transmission Typehydroshift
Front Axle
Oscillation - Total26 degrees
Ground Clearance1.5 ft
Wheel Lean22 degrees
Moldboard
Moldboard Width10.2 ft
Moldboard Height24.7 in
Moldboard Thickness0.8 in
Max Depth Of Cut17.4 in
Circle
Max Reach Outside Tires - Left54 in
Max Reach Outside Tires - Right56 in
Max Lift Above Ground14.2 in

Source

Compare Komatsu GD31RC-3A, GD405A-1
Dimensions and weight
SpecificationGD31RC-3AGD405A-1
Overall Length22.18 ft23.05 ft
Width Over Tires6.83 ft7.11 ft
Wheelbase16.08 ft16.08 ft
Rear Ground Clearance1.15 ft0.99 ft
Tandem Axle Wheelbase3.94 ft4.29 ft
Front Ground Clearance1.43 ft1.43 ft
Height To Top Of Isomount Cab10.37 ft10.88 ft
Engine
SpecificationGD31RC-3AGD405A-1
Engine Model4D1306D105
Net Power Gear 5-6110 hp110 hp
Max Power110 hp110 hp
Net Torque Gears 5-6375 lb-ft282 lb-ft
Displacement518 cu in396 cu in
Operational
SpecificationGD31RC-3AGD405A-1
Std Operation Weight - Front Axle5,269 lb5,622 lb
Std Operation Weight - Rear Axle14,418 lb13,955 lb
Std Operation Weight - Total19,687 lb19,577 lb
Tire Sizefront 9.00-20-10PR, rear 11.00-20-10PRfront 9.00-20-10PR, rear 11.00-20-10PR
Steering
SpecificationGD31RC-3AGD405A-1
Turning Radius29.6 ft18.4 ft
Transmission and speeds
SpecificationGD31RC-3AGD405A-1
Transmission Typesliding mesh and constant mesh combinedhydroshift
Number Of Gears - Forward66
Number Of Gears - Reverse26
Max Speed - Forward23.8 mph26.1 mph
Max Speed - Reverse7.3 mph28 mph
Front Axle
SpecificationGD31RC-3AGD405A-1
Wheel Lean25 degrees22 degrees
Oscillation - Total26 degrees26 degrees
Ground Clearance1.5 ft1.5 ft
Moldboard
SpecificationGD31RC-3AGD405A-1
Moldboard Width10.2 ft10.2 ft
Moldboard Height20.5 in24.7 in
Moldboard Thickness0.5 in0.8 in
Max Depth Of Cut17 in17.4 in
Circle
SpecificationGD31RC-3AGD405A-1
Max Reach Outside Tires - Left61.3 in54 in
Max Reach Outside Tires - Right61.3 in56 in
Max Lift Above Ground18.2 in14.2 in

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