Mechanical haul truck

HD405-8

  • Gross horsepower 386 kW @ 2 000 rpm 518 HP @ 2,000 rpm
  • Operating weight 77 415 kg 170,671 lbs.
  • Capacity 40.0 mt 44.1 st
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  • Komatsu HD405 truck in white background
  • Komatsu HD405 truck in constuction site

Maneuverability even in tight spaces

Known for its maneuverability and tight turning radius, the HD405-8 helps you deliver high productivity and offers impressive durability. A fully automatic K-ATOMiCS transmission with lock-up torque converter, a hydro-pneumatic suspension system and oil-cooled multiple-disc brakes makes this the right choice for a variety of jobs.

  • Up to 6% reduction in fuel consumption*
  • Increased horsepower by 3.2%*
  • Enhanced serviceability*
  • Improved operator environment*

    *Compared to HD405-7

Features and benefits

HD605_Literature link_MacPhersonSus_fig_2.psd

MacPherson-strut-type suspension

A comfortable ride, even on uneven roads. The MacPherson-strut-type independent front suspension allows the front wheels to follow uneven road surfaces smoothly.
Truck_HD_literature link_BrakesRetarder.png

Fully hydraulic wet multiple-disc brakes

Give your operator greater confidence at higher downhill speeds with wet multiple-disc brakes. Continuously oil-cooled, multiple-disc brakes function as a highly responsive retarder for added reliability and stable brake performance.
HD325_Literature link__MG_8206.eps

Automatic retard speed control

Let your operator concentrate more on steering by simply setting the downhill travel speed at increments of 0.6 mph to match the optimum speed for slope. Travel speed is automatically lowered if oil temperature increases to a set limit.
HD325_Literature link_p6_K_atomics.psd

K-ATOMiCS transmission

Komatsu Advanced Transmission with Optimum Modulation Control System (K-ATOMiCS) helps avoid unnecessary fuel consumption, reduce material spillage and provide a smoother ride for operators by automatically selecting a gear position depending on grade, speed and acceleration.
HD605_Literature link_traction control.eps

Komatsu Traction Control System (KTCS)

KTCS is engineered for optimal traction in soft or wet road conditions with a system that monitors for wheel slippage at the rear axle. If slippage is detected, brakes are applied independently and automatically to each wheel set.
HD325_Literature link_pg14_frame_1.psd

High rigidity frame

Cast-steel components are used in critical areas of the main frame where loads and shocks are most concentrated for increased machine durability.
HD405_Literature link__N7A0031-A-s01_OL.psd

Robust dump body design

Remarkable rigidity and low maintenance cost with a body design made of high-tensile-strength steel. Stability and lower center of gravity through a standard V-shape body design.
HD405_Literature link_HD325_405-8 Cab Interior.jpg

Ergonomically designed cab

Operator comfort is key to your operation’s productivity. Designed for operator comfort, an ergonomically designed cab compartment has a convenient control layout.
HD405_Literature link_WA_N7A0345-B-s01_msA_v1.psd

Convenient access

Machine maintenance is made more convenient with inclined stairs and handrails that provide easy access to the cab and service deck.
HD325_Literature link_pg14_PLM_1.psd

Integrated payload meter

Manage the hauling cycle payloads and analyze the production volume and working conditions for specific time periods. Loaded weight is shown on the payload display and external display lamps in real time.
HD325_Literature link_pg15_ground_battery.png

Ground-accessible battery compartment

Facilitate daily checks and battery replacement with a battery compartment located at ground level for convenient access.
HD325_Literature link_pg15_greasing_1.psd

Centralized greasing points

Easy accessibility with ground-level greasing points centralized at three locations.

Specifications for HD405-8

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US system Metric
Engine
Model Komatsu SAA6D140E-7*
Type Water-cooled, 4-cycle
Aspiration Variable geometry, turbo-charged, air-to-air
after-cooled, cooled Exhaust Gas Recirculation (EGR)
Number of cylinders 6
Bore x stroke 140 x 165 mm
Piston displacement 15.24 L
Horsepower:  
SAE J1995 386 kW
ISO 9249 /SAE J1349 383 kW
Rated rpm 2 000 rpm
Fan drive type Hydraulic
Maximum torque 221 kg-m
Fuel system Direct injection
Governor Electronically controlled
Lubrication system:  
Method Gear pump, force-Iubric
Filter Full-flow type
Air cleaner Dry type with double elements and precleaner, plus dust indicator

*EPA Tier 4 Final emissions certified

Model Komatsu SAA6D140E-7*
Type Water-cooled, 4-cycle
Aspiration Variable geometry, turbo-charged, air-to-air
after-cooled, cooled Exhaust Gas Recirculation (EGR)
Number of cylinders 6
Bore x stroke 5.5 x 6.5 in
Piston displacement 930 in3
Horsepower:  
SAE J1995 518 HP
ISO 9249 /SAE J1349 514 HP
Rated rpm 2,000 rpm
Fan drive type Hydraulic
Maximum torque 1600 Ibs.-ft.
Fuel system Direct injection
Governor Electronically controlled
Lubrication system:  
Method Gear pump, force-Iubric
Filter Full-flow type
Air cleaner Dry type with double elements and precleaner, plus dust indicator

*EPA Tier 4 Final emissions certified
Transmission
Torque converter Three-elements, one-stage, two-phase
Transmission Full-automatic, planetary type
Speed range Seven speeds forward and one reverse
Lockup clutch Wet, single-disk clutch
Forward Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gears
Reverse Torque converter drive
Shift control Electronic shift control with automatic clutch modulation in all gears
Maximum travel speed 66 kph
Torque converter Three-elements, one-stage, two-phase
Transmission Full-automatic, planetary type
Speed range Seven speeds forward and one reverse
Lockup clutch Wet, single-disk clutch
Forward Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gears
Reverse Torque converter drive
Shift control Electronic shift control with automatic clutch modulation in all gears
Maximum travel speed 41.0 mph
Axles
Rear axle Full-floating
Final drive Planetary gear
Ratios:
Differential 3.125
Planetary 5.211
Rear axle Full-floating
Final drive Planetary gear
Ratios:
Differential 3.125
Planetary 5.211
Suspension System

Independent, hydropneumatic suspension cylinder with fixed throttle to dampen vibration

Effective cylinder stroke (front suspension) 250 mm
Rear axle oscillation:
Oil stopper 6.8°
Mechanical stopper 8.1°

Independent, hydropneumatic suspension cylinder with fixed throttle to dampen vibration

Effective cylinder stroke (front suspension) 9.8 in
Rear axle oscillation:
Oil stopper 6.8°
Mechanical stopper 8.1°
Steering System
Type Fully hydraulic power steering with two double-acting cylinder
Supplementary steering Automatic/manual control (meets ISO 5010, SAE J1511 and SAE J53)
Minimum turning radius 7.9 m
Maximum steering angle 38°
Type Fully hydraulic power steering with two double-acting cylinder
Supplementary steering Automatic/manual control (meets ISO 5010, SAE J1511 and SAE J53)
Minimum turning radius 25 ft. 11 in
Maximum steering angle 38°
Cab

Dimensions comply with ISO 3471 and SAE J1040-1988c ROPS (Roll-Over Protective Structure) standards.

Dimensions comply with ISO 3471 and SAE J1040-1988c ROPS (Roll-Over Protective Structure) standards.
Brakes

Brakes meet ISO 3450 and SAE 1473 standards

Service brakes:  
Front Dry type, single disc type full hydraulic
Rear Wet type, multiple disc type, full hydraulic
Parking brake Dry type, single disc type, spring operated, hydraulic releasing type
Retarder Oil-cooled, multiple-disc type
Secondary brake Manual pedal operation
When hydraulic pressure drops below the rated level, parking brake is automatically actuated
Brake surface:  
Front 968 cm2 
Rear 50 847 cm2 

Brakes meet ISO 3450 and SAE 1473 standards

Service brakes:  
Front Dry type, single disc type full hydraulic
Rear Wet type, multiple disc type, full hydraulic
Parking brake Dry type, single disc type, spring operated, hydraulic releasing type
Retarder Oil-cooled, multiple-disc type
Secondary brake Manual pedal operation
When hydraulic pressure drops below the rated level, parking brake is automatically actuated
Brake surface:  
Front 150 in2
Rear 7,881 in2
Main Frame

Type

Box-sectioned structure

Type

Box-sectioned structure
Body
Capacity:  
Struck 20 m3
Heaped (2:1, SAE) 27.3 m3
Payload 40.0 metric tons
Material (high tensile strength steel) 160 kg/mm2
Structure V-shape body
Material thickness:  
Bottom 19 mm
Front 16 mm
Sides 14 mm
Target area (inside length x width) 5640 x 3380 mm
Dumping angle 48°
Height at full dump 8 100 mm
Heating Exhaust heating
Capacity:  
Struck 26.2 yd3
Heaped (2:1, SAE) 35.7 yd3
Payload 44.1 US tons
Material (high tensile strength steel) 227,520 psi
Structure V-shape body
Material thickness:  
Bottom 0.75 in
Front 0.63 in
Sides 0.55 in
Target area (inside length x width) 18 ft. 6 in x 11 ft. 1 in
Dumping angle 48°
Height at full dump 26 ft. 7 in
Heating Exhaust heating
Hydraulic System
Hoist cylinder Twin, 2-stage telescopic type
Relief pressure 20.6 MPa 210 kg/cm2
Hoist time 10 s
Hoist cylinder Twin, 2-stage telescopic type
Relief pressure 2,990 psi
Hoist time 10 s
Weight (approximate)
Empty weight 37 335 kg
Max. gross vehicle weight:  
Standard tire 77 415 kg
Not to exceed max. gross vehicle weight,
including options, fuel and payload		  
Weight distribution:  
Empty:  
Front axle 54.2%
Rear axles 45.8%
Loaded:  
Front axle 32.9%
Rear axles 67.1%
Empty weight 82,310 lbs.
Max. gross vehicle weight:
Standard tire 170,671 lbs.
Not to exceed max. gross vehicle weight,
including options, fuel and payload
Weight distribution:
Empty:
Front axle 54.2%
Rear axles 45.8%
Loaded:
Front axle 32.9%
Rear axles 67.1%
#BBD0E0 »
Tires

Standard tire: 21.00 R33

Standard tire: 21.00 R33
Service Refill Capacities
Fuel tank 456 L
DEF tank 34.7 L
Engine oil 50 L
Torque converter, transmission and retarder cooling 112 L
Differential 45 L
Final drive (left and right) 30 L
Hydraulic system 120 L
Suspension (total) 44.2 L
Fuel tank 120.5 US gal
DEF tank 9.2 US gal
Engine oil 13.2 US gal
Torque converter, transmission and retarder cooling 29.6 US gal
Differential 11.9 US gal
Final drive (left and right) 7.9 US gal
Hydraulic system 31.7 US gal
Suspension (total) 11.7 US gal

ENGINE:

  • Air cleaner, dry type, two stage
  • Automatic Idling Setting System (AISS)
  • Auto Idle Shutdown
  • Electric priming fuel pump
  • Engine secondary stop switch
  • Engine, Komatsu SAA6D140E-7, six cylinder, turbocharged, air/air aftercooled, EGR cooled, diesel; Gross HP (SAE J1995): 386 kW / 2000 RPM; Net HP (ISO
  • 9249/SAE J1349): 383 kW / 2000 RPM
  • Fan, hydraulically driven, reversible
  • Komatsu Diesel Particulate Filter (KDPF)
  • Starting aid, intake manifold pre-heater
  • Variable geometry turbocharger

ELECTRICAL SYSTEM:

  • Alternator, 140 ampere , 24 volt
  • Back-up alarm
  • Batteries, 2 x 12 volt 160 Ah, 910 CCA
  • Battery disconnect switch
  • Horn, electric
  • Lights
    - Back-up light, rear
    - Engine compartment light
    - Head lights, halogen (high and low beam)
    - Side working lights, LH and RH
    - Stop and tail lights (LED)
    - Turn signal, (two front, two rear)(LED) with hazard switch
  • Starting motors, 11.0 kW direct electric 24V

POWER TRAIN AND CONTROLS:

  • Seven-speed transmission, fully automatic with K-ATOMiCS
  • Komatsu Traction Control System (KTCS)
  • Front brake, dry type, single disc type, full hydraulic
  • Parking brake, dry type, single disc type, spring operated, hydraulic releasing type
  • Rear brake, Wet type, multiple disc type, full hydraulic
  • Skip shift function

OPERATOR ENVIRONMENT:

  • Cab, with built in ROPS/FOPS
    - 12 Volt outlet (qty two)
    - Automatic climate control system with cab pressurization
    - Auxiliary steering system
    - Beverage holder (qty two)
    - Body hoist control, electric
    - Cigarette lighter and ashtray
    - Dome light and reading light
    - Door, LH and RH
    - Lunch box tray and storage trays
    - Machine monitor with seven-inch color LCD display
    - Operator seat, air suspension type, heated, ventilated, with three-point retractable seat belt 75 mm wide lap belt and 50 mm wide, high visibility shoulder belt)
    - Power windows, LH and RH
    - Radio, AM/FM with aux terminal
    - Rearview mirror, outside cab mount, heated (LH & RH)
    - Rearview monitoring system with dedicated monitor
    - Steering wheel, tilt and telescopic
    - Sun visor (qty two)
    - Tinted glass (front, laminated glass)
    - Trainer seat, folding, with two-point retractable seat belt (75 mm wide)
    - Wiper/washer, front, with intermittent setting

GUARD AND COVER GROUP:

  • Catwalk with handrails
  • Deck rail
  • Driveline guards, front & rear
  • Engine underguard
  • Exhaust thermal guard
  • Front handrail, over radiator
  • Mudguards
  • Transmission underguard

MONITORING SYSTEM, ELECTRONIC DISPLAY ITEMS:

  • Instrument panel gauges
    - Coolant temperature
    - Hour meter (Service meter)
    - Retarder oil temperature
    - Speedometer with odometer
    - Tachometer
    - Torque converter oil temperature
  • Warning lights
    - DEF level
    - Engine coolant temperature
    - Engine coolant level
    - Engine oil pressure
    - Parking brake
    - Retarder oil temperature
    - Torque converter oil temperature

OTHER:

  • Angled front stairs with hand rails
  • Automatic retarder speed control (ARSC)
  • Centralized lube block
  • Dump counter
  • Ecology guidance and ecology gauge
  • Fast-fill coupler for fuel tank
  • Filler cap and cover locks
  • Front brake cut-off system
  • Hydropneumatic suspension (front & rear)
  • Less body (must select body)
  • Mirror, rearview, underview
  • PM Service connectors
  • Rock ejector bars
  • KOMTRAX® telematics package with integrated payload meter (PLM)
  • Wheel chocks with storage brackets

ENGINE:

  • Air cleaner, dry type, two stage
  • Automatic Idling Setting System (AISS)
  • Auto Idle Shutdown
  • Electric priming fuel pump
  • Engine secondary stop switch
  • Engine, Komatsu SAA6D140E-7, six cylinder, turbocharged, air/air aftercooled, EGR cooled, diesel; Gross HP (SAE J1995): 518 HP / 2000 RPM; Net HP (ISO
  • 9249/SAE J1349): 514 HP / 2000 RPM
  • Fan, hydraulically driven, reversible
  • Komatsu Diesel Particulate Filter (KDPF)
  • Starting aid, intake manifold pre-heater
  • Variable geometry turbocharger

ELECTRICAL SYSTEM:

  • Alternator, 140 ampere , 24 volt
  • Back-up alarm
  • Batteries, 2 x 12 volt 160 Ah, 910 CCA
  • Battery disconnect switch
  • Horn, electric
  • Lights
    - Back-up light, rear
    - Engine compartment light
    - Head lights, halogen (high and low beam)
    - Side working lights, LH and RH
    - Stop and tail lights (LED)
    - Turn signal, (two front, two rear)(LED) with hazard switch
  • Starting motors, 11.0 kW direct electric 24V

POWER TRAIN AND CONTROLS:

  • Seven-speed transmission, fully automatic with K-ATOMiCS
  • Komatsu Traction Control System (KTCS)
  • Front brake, dry type, single disc type, full hydraulic
  • Parking brake, dry type, single disc type, spring operated, hydraulic releasing type
  • Rear brake, Wet type, multiple disc type, full hydraulic
  • Skip shift function

OPERATOR ENVIRONMENT:

  • Cab, with built in ROPS/FOPS
    - 12 Volt outlet (qty two)
    - Automatic climate control system with cab pressurization
    - Auxiliary steering system
    - Beverage holder (qty two)
    - Body hoist control, electric
    - Cigarette lighter and ashtray
    - Dome light and reading light
    - Door, LH and RH
    - Lunch box tray and storage trays
    - Machine monitor with seven-inch color LCD display
    - Operator seat, air suspension type, heated, ventilated, with three-point retractable seat belt 3" wide lap belt and 2" wide, high visibility shoulder belt)
    - Power windows, LH and RH
    - Radio, AM/FM with aux terminal
    - Rearview mirror, outside cab mount, heated (LH & RH)
    - Rearview monitoring system with dedicated monitor
    - Steering wheel, tilt and telescopic
    - Sun visor (qty two)
    - Tinted glass (front, laminated glass)
    - Trainer seat, folding, with two-point retractable seat belt (3" wide)
    - Wiper/washer, front, with intermittent setting

GUARD AND COVER GROUP:

  • Catwalk with handrails
  • Deck rail
  • Driveline guards, front & rear
  • Engine underguard
  • Exhaust thermal guard
  • Front handrail, over radiator
  • Mudguards
  • Transmission underguard

MONITORING SYSTEM, ELECTRONIC DISPLAY ITEMS:

  • Instrument panel gauges
    - Coolant temperature
    - Hour meter (Service meter)
    - Retarder oil temperature
    - Speedometer with odometer
    - Tachometer
    - Torque converter oil temperature
  • Warning lights
    - DEF level
    - Engine coolant temperature
    - Engine coolant level
    - Engine oil pressure
    - Parking brake
    - Retarder oil temperature
    - Torque converter oil temperature

OTHER:

  • Angled front stairs with hand rails
  • Automatic retarder speed control (ARSC)
  • Centralized lube block
  • Dump counter
  • Ecology guidance and ecology gauge
  • Fast-fill coupler for fuel tank
  • Filler cap and cover locks
  • Front brake cut-off system
  • Hydropneumatic suspension (front & rear)
  • Less body (must select body)
  • Mirror, rearview, underview
  • PM Service connectors
  • Rock ejector bars
  • KOMTRAX® telematics package with integrated payload meter (PLM)
  • Wheel chocks with storage brackets

BODY:

  • Alternative exhaust configuration (RH side discharge)
  • Body
  • Body liner

TIRES (21.00 R33):

  • Michelin XHAUL
  • Michelin X-Traction
  • Bridgestone VMTP

BODY:

  • Alternative exhaust configuration (RH side discharge)
  • Body
  • Body liner

TIRES (21.00 R33):

  • Michelin XHAUL
  • Michelin X-Traction
  • Bridgestone VMTP
Support you can count on

Financing

Financing can be a major advantage for your operation, enabling you to get the equipment and service you need with terms to fit your balance sheet. Take advantage of competitive and flexible financial tools with Komatsu financing.

If you want to improve cost per ton, you first have to know how to measure it

Understanding what changes can make the biggest impact on your production is the quickest way to improve your productivity.

Right-sizing your fleet

A four part process to help customers finish jobs on time and in the black

Technology that works as hard as you do

Phone and laptop displaying KOMTRAX data for dozers
Telematics data can drive results for business operations, but only when you can collect and analyze it efficiently. Get the insights that can benefit your bottom line.

Learn more

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