DIMENSIONS

29.5 R25 29.5 R25 29.5 R25

2690 mm 8'10"

1600 mm 5'3"

1350 mm

4'5" 1970 mm 6'6"

720

mm

2'4"

620

mm

2'0"

7130

mm

23'

5"

3450

mm

11'

4"

4350 mm 14'3" 1820 mm6'0"

620 mm2'0"

3450 mm 11'4" 2885 mm 9'6"

45˚

26˚

70˚

11025 mm 36'2"

5400 mm 17'9"

4170 mm

13'8"

8700 mm 28'7"

2970

mm

9'9

"

3700

mm

12'

2"

F1

F2

F3

F4

F5

F6

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LOADEDEMPTY

GROSS WEIGHT

TRAVEL SPEED

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15.014.013.012.011.010.09.08.0

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103 lb

103 lb

103 kg

103 kg

km/h

MPH0 10

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20 30 40 50 60 70 80 90 100 km/h

0

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10 20 30 40 50 60 70 80 90 100 103 kg

103 lb

MPH

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-40-45-50

TRAVEL SPEED

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GRADE DISTANCE : COUNTINUOUS DESCENT

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WITHOUT EXHAUST

EMPTY LOADED

WITH EXHAUST(OPTION)

TRAVEL PERFORMANCE BRAKE PERFORMANCE

CEN00343-00

Standard equipment may vary for each country, and this specification sheet may contain attachments and optional equipment that are not available in your area. Please consult your Komatsu distributor for detailed information.

Printed in Japan 200807 IP.As(05)

GROSS HORSEPOWER331 kW 444 HP

NET HORSEPOWER321 kW 430 HP

MAXIMUM GVW66,875 kg 147,435 lb

Photo may include optional equipment

AR

TIC

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HM400-1

HM

400

Lubrication-Free Oscillating Hitch The lubricant-free oscillating hitchmeans lower operating costs.

3

HM400-1ARTICULATED DUMP TRUCK

Hydropneumatic Suspension for All Terrain The hydropneumatic suspensionassures a comfortable ride evenover rough terrain.

Interaxle & Differential Locks for Excellent Traction in Rough TerrainThe oil-cooled multiple-disk interaxle lock and differential locks can be turned on and off during travelling.Also the differential locks can lock up all 3-axles differentials for maximum traction.

Komatsu Designed Electronically ControlledTransmission for a Comfortable Ride F6-R2 counter-shaft type transmission with K-ATOMiCS (Komatsu Advanced Transmissionwith Optimum Modulation Control System).

Reliable Wet Type Multiple-Disk Brake and Retarder● Fully hydraulically controlled wet multiple-disk

brake.● Retarder Absorbing Capacity (continuous descent):

405 kW 544 HP583 kW 782 HP (with optional exhaust retarder)

Easy-to-Load Body● Heaped capacity: 22.3 m3 29.2 yd3

● Low loading height: 2970 mm 9'9"● Robust body constructed of thick wear-resistant

steel having 400 Brinell hardness.

GROSS HORSEPOWER331 kW 444 HP @ 2000 rpm

NET HORSEPOWER321 kW 430 HP @ 2000 rpm

MAXIMUM GVW66,875 kg 147,435 lb

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HM400-1 Articulated Dump Truck

WALK-AROUNDWALK-AROUND

Tiltable Cab The cab can be tilted rearward to provide easyservice.

Wide, Spacious Cab● The wide cab offers a comfortable operator

environment.● Viscous mounts support the cab while

absorbing vibrations and noise.● Interior noise level: 76 dB(A).

Fully Hydraulic Articulated Steering● Light and easy operation● Minimum turning radius: 8.7 m 28' 7"

The HM400-1 offers all around maximum productivity with faster travel speed and manyfeatures enhancing efficiency, as well as reduced maintenance costs. Everywhere fromconstruction sites to landfill, the HM400-1 excels.

High Performance and Environmentfriendly SAA6D140E-3 Engine● Gross Horsepower:

331 kW 444 HP

Interaxle & Differential LockingSystems

The full-time six-wheel drive system reduces slippage. A wet multiple-disk interaxle clutch also locks the three axles in unison for greater traction. The interaxle lock and differential locks can be switched on and off while the truck is travelling, thereby boosting productivity. In addition, the differential lock switch, which is a three position switch, can lock up the rear axle differentials only, or all axles for maximum performance in theworst conditions.

Fully Hydraulically Controlled Wet Multiple-Disk Brakes and RetarderWet multiple-disk brakes have been proven on Komatsu dump trucks and wheel loaders. They ensure highly reliable and stable brake performance. The large-capacity wet-multiple disk brakes also function as a highly responsive retarder which gives the operator great confidence while travelling downhill.Retarder Absorbing Capacity (continuous descent):

405 kW 544 HP583 kW 782 HP (with optional exhaust retarder)

Large Capacity Body and BoxSection Frame Structure

The 22.3 m3 29.2 yd3 heaped capacityis among the highest in its class, andthe low loading height of 2970 mm 9'9"enables easy loading. The body is builtof thick wear-resistant steel with aBrinell hardness of 400, and the bodyshape provides excellent load stability.Rugged enough for the toughest jobs,the HM400's frame is designed using arigid box structure with high strengthlow alloy steel.

Articulated Steering

Fully hydraulic articulated steering offers low-effort operating performance and maneuverability. A minimum turning radius of only 8.7 m 28' 7" provides the freedom to move about in confined areas.

Komatsu Designed Electronically ControlledTransmission

Komatsu designed Electronically Controlled Transmission called K-ATOMiCS has been successfully employed in Komatsu's rigiddump trucks. The electronic clutch modulation system ensuresproper clutch pressure when the clutch is engaged. The totalcontrol system controls both the engine and transmission by monitoring the vehicle conditions. This high technology system assures smooth shifts without shock.

5

HM400-1ARTICULATED DUMP TRUCK

4

The combination of high travel speeds and an efficient engine with low emissionsdelivers maximum productivity at the lowest cost.

PRODUCTIVITY

FEATURES

PRODUCTIVITY

FEATURES

High Performance SAA6D140E-3 Engine

This engine delivers faster acceleration andhigher travel speeds with the highest horsepowerper ton in its class. Advanced technology, suchas high-pressure electronic controlled injectionsystem (CRI), air to air aftercooler and an efficient turbocharger enabling the engine to suitlow emission. High torque at low speed, impressive acceleration and low fuel consumption ensure maximum productivity.

8.7 m 28'7"

Hydropneumatic Suspension

The hydropneumatic suspension has been proven onKomatsu's rigid dump trucks. The front axle suspensionemploys "De Dion" type design, allowing the machine toride more smoothly over bumps. The rear-axles aremounted on a dynamic equalizer structure equippedwith hydropneumatic suspension. The entire vehicle'ssuspension system responds to the ground conditions. The suspension delivers a comfortable ride and maximizes the productivity.

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Tiltable Cab

The cab can be tilted rearward to provide easymaintenance/service for theengine and transmission.Note: An external hydraulicpump is required to tilt thecab.

EASY

MAINTENANCE

EASY

MAINTENANCEThe HM400-1 has been designed to keep service time down and productivity up byhaving a lubrication-free oscillating hitch, a reduced number of grease points, easyaccess to filters, and longer intervals between oil changes.

Fewer Grease Points

We have minimized thenumber of grease points byusing maintenance-free rubber bushings and a lubrication-free oscillatinghitch.

Taper roller bearingOil seal

Guards

The following guards are provided as standard:● Protective grille for rear window● Engine underguard● Transmission underguard● Propeller shaft guards● Exhaust thermal guard● Fire prevention covers

Extended Service Intervals

In order to minimize operating costs service intervals have been extended.● Engine oil: 500 hours● Transmission oil: 1000 hours● Engine & transmission filters: 500 hours

6

OPERATOR

ENVIRONMENT

OPERATOR

ENVIRONMENT

Wide, Spacious CabThe wide cab provides a comfortable space for the operator and a full size buddy seat. Large, electrically operated windows and the operator's seat positioned to the left side ensure superior visibility.

Ergonomically Designed CabThe ergonomically designed operator's compartmentmakes it very easy and comfortable for the operator to useall the controls. The result is more confident operation byoperators and greater productivity.

Viscous Cab MountsViscous mounts reduce the noisetransmitted to the cab and achievea quiet 76 dB(A) noise level.

Steering Wheel and PedalsLow effort pedals reduce driver fatigue when working continuously for long periods. The tiltable, telescopingsteering column enables operators to maintain the optimum driving position at all times.

Built-in ROPS/FOPSThese structures conform to ISO 3471 and SAE J1040-1988 standards.

Hydropneumatic Suspension for All TerrainThe hydropneumatic suspension assures a comfortableride even over rough terrain and ensures maximum productivity and operator confidence.

Air Suspension SeatThe air suspension fabric covered seat which is adjustableto the operator's weight is provided as standard. The airsuspension seat dampens vibrations transmitted from themachine and reduces operator fatigue as well as holdingthe operator securely to assure confident operation.

Electric Body Dump Control LeverThe extra light lever makes dumping easier than ever.

Supplementary Steering and Secondary BrakesSupplementary steering and secondary brakes are standard features.Steering: ISO 5010-1992, SAE J1511Brakes: ISO 3450-1996, SAE J1473

Easy-to-See Instrument PanelThe instrument panel makes it easy to monitor criticalmachine functions. In addition a caution light warns theoperator of any problems that may occur. Problems arerecorded in the monitor and indicated as servic codes.This makes the machine very friendly and easy to service.

Komatsu has developed a state-of-the-art, wide comfortable cab. The low level of vibration and noiseensures maximum productivity from the operator.

HM400-1ARTICULATED DUMP TRUCK

STANDARD EQUIPMENT

OPTIONAL EQUIPMENT

8

Cab:● Air conditioner● Radio, AM● Radio, AM/FM● Radio, AM/FM with cassetteBody:● Body liner● Body exhaust heating kit● Rock body● Tailgate, wire type● Upper side extension, 200 mm 8”Lighting system:● Fog lights● Back work lights, left and right side

● Yellow beaconSafety:● Additional retarder, engine exhaust● Rear view camera and monitorGauge:● Engine oil filter warning alarm and lightArrangement:● Batteries for cold area arrangement● Cold area arrangement (from -30˚C –22˚F to -40˚C -40˚F)● Poor fuel (contained water) arrangement● Sandy and dusty area arrangement

Other:● Alternator, 75A● Auto-greasing system● Fire extinguisher● Gas charge tool● Radiator shutter, canvas type● Spare parts for first service● Tool kit● Vandalism protectionTires:● 875/65 R29

Engine:● Alternator, 50A/24V● Batteries, 2 x 12V 170AH● Exhaust muffler● Komatsu SAA6D140E-3● Starting motor, 1 x 11.0 kWCab:● Ashtray● Can holder● Cigarette lighter● Electronic display/monitoring system● Electronic hoist control system● Heater and defroster● Operator seat, reclining, air suspension type with retractable 78 mm3” width seat belt● Passenger seat with retractable seat belt● Power window● Tiltable ROPS Cab with FOPS, sound suppression type

● Space for lunch box● Steering wheel, tilt & telescopic● Sun visor, front window● Two doors, left and rightLighting system:● Back-up light● Hazard lights● Headlights with dimmer switch● Indicator and stop and tail lightsSafety:● Anti-slip material on fenders● Automatic supplementary steering● Back-up alarm● Coolant temperature alarm and light● Hand rails for platform● Electric horn● Ladders, left and right side● Protective grille for rear window● Rear view mirrors● Steering joint locking assembly

● Under view mirrorGuards:● Engine underguard● Exhaust muffler thermal guard● Fire prevention covers● Propeller shaft guards, front and rear● Transmission underguardOther:● Centralized greasing● Differential locks in all axles, clutch type● Electric circuit breaker, 24V● Mud guards● Side markerBody:● Electronic hoist control systemTires:● 29.5 R25

AXLES

Full time all wheel drive with 100% differential lock in all axles.Final drive type . . . . . . . . . . . . . . . . . . . . . . . . Planetary gearRations:

Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.417Planetary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.941

TRANSMISSION

Torque converter . . . . . . . . . . . . 3-elements, 1-stage, 2-phaseTransmission . . . . . . . . . . . Full-automatic, counter-shaft typeSpeed range . . . . . . . . . . . . . 6 speeds forward and 2 reverseLockup 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 and direct drive in all gearShift control . . . . . . . . . Electronic shift control with automatic

clutch modulation in all gearMax. travel speed . . . . . . . . . . . . . . . . . 58.6 km/h 36.4 MPH

SPECIFICATIONSSPECIFICATIONS

WEIGHT (APPROXIMATE)

Empty weight . . . . . . . . . . . . . . . . . . . . . 30300 kg 66,800 Ib. Gross vehicle weight. . . . . . . . . . . . . . . 66875 kg 147,435 Ib. Weight distribution:

Empty: front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55%rear axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45%

Loaded: front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . 28%rear axles . . . . . . . . . . . . . . . . . . . . . . . . . . . 72%

ENGINE

Model. . . . . . . . . . . . . . . . . . . . . . . KOMATSU SAA6D140E-3Type . . . . . . . . . . . . . . . . . . . . . . . . . . . Water-cooled, 4-cycleAspiration. . . . . . . . . Turbo-charged and air-to-air after-cooledNo. of cylinders. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Bore x stroke . . . . . . . . . . . 140 mm x 165 mm 5.51" x 6.50"Piston displacement . . . . . . . . . . . . . . . . . . . . 15.2 ltr. 928 in3

Performance:Gross horsepower . . . . . . . . . . . . . . . . . . 331 kW 444 HPFlywheel horsepower . . . . . . . . . . . . . . . . . 321 kW 430 HP

Rated RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 RPMMax.torque . . . . . . . . . . . . . . . . . . . . . . 208.5 kg·m 1,508 ft.lbFuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . Direct injectionGovernor . . . . . . . . . . . . . . . . . . . . . . Electronically controlledLubrication system

Method . . . . . . . . . . . . . . . . . . Gear pump, force-lubricationFilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full-flow type

Air cleaner . . . . . . . . . . . . Dry type with double elements and precleaner, plus dust indicator

SUSPENSION SYSTEM

Front . . . . . . . . . . . . . . . . . . . . . . . Hydropneumatic suspensionRear . . . . . . . . . . . . . . . Combined hydropneumatic suspension

and rubber suspension system

MAIN FRAME

Type . . . . . . . . . . . . . . . . . . . . Articulated type, box-sectionedconstruction on front and rear

STEERING SYSTEM

Type . . . . . . . . . . Articulated type, fully hydraulic power steering with two double-acting cylinders

Supplementary steering. . . . . . . . . . . . . Automatically actuated, electrically powered

Minimum turning radius, wall to wall . . . . . . . . . . . . 8.7 m 28' 7"Articulation angle. . . . . . . . . . . . . . . . . . . . . . 45˚ each direction

BRAKES

Service brakes . . . . . . . . . . . . Full-hydraulic control, oil-cooled, multiple-disc type on all wheels

Parking brake . . . . . . . . . . . . . Spring applied, caliper disc typeRetarder . . . . . . . . Front and center axle brakes act as retarder

BODY

Capacity:Struck . . . . . . . . . . . . . . . . . . . . . . . . . 16.5 m3 21.6 cu.yd3

Heaped(2:1, SAE) . . . . . . . . . . . . . . . . 22.3 m3 29.2 cu.yd3

Payload . . . . . . . . . . . . . . . . . 36.5 metric tons 40 U.S. tonsMaterial. . . . . . . . . . . . . . . . . . . . . . 130 kg/mm2 184925 PSl

high-tensile-strength steelMaterial thickness:

Bottom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 mm 0.63"Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 mm 0.31"Sides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm 0.47"

Target area (inside length x width) . . . . . . . . . . . . . . . . . . . . . 5629 mm x 3194 mm 18' 6" x 10' 6"

Heating . . . . . . . . . . . . . . . . . . . . . . Exhaust heating, (option)

HYDRAULIC SYSTEM

Hoist cylinder . . . . . . . . . . . . . . Twin, 2-stage telescopic typeRelief pressure . . . . . . . . . . 20.6 Mpa 210 kg/cm2 2,990 PSlHoist time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 sec

CAB

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

TIRES

Standard tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5 R25

SERVICE REFILL CAPACITIES

Fuel tank . . . . . . . . . . . . . . . . . . . . . . . 495 ltr. 130.8 U.S. galEngine oil . . . . . . . . . . . . . . . . . . . . . . . . 52 ltr. 13.7 U.S. galTorque converter, transmission and

retarder cooling . . . . . . . . . . . . . . . . . 115 ltr. 30.4 U.S. galDifferentials (total). . . . . . . . . . . . . . . . . 54.5 ltr. 14.4 U.S. galFinal drives (total) . . . . . . . . . . . . . . . . . . . 35 ltr. 9.2 U.S. galHydraulic system . . . . . . . . . . . . . . . . . . 180 ltr. 47.6 U.S. galSuspension (total). . . . . . . . . . . . . . . . . . 28.4 ltr. 7.5 U.S. gal

HM400-1ARTICULATED DUMP TRUCK

9