KOMATSU HM400-5
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2026
Komatsu
HM400-5
New
Ready for tough conditions
Move material across challenging, adverse terrain with the HM400-5 articulated truck. For job sites where roads may not exist or are not well established, this machine was designed and equipped to deliver productive, consistent performance — for operators of all experience levels.
- Excellent maneuverability
- Automated powertrain features
- Customer-approved ride comfort
- Designed for durability
Engine
| Model | Komatsu SAA6D140E-7* |
| Type | Water-cooled, 4-cycle |
| Aspiration | Komatsu variable geometry, turbo-charged, after-cooled, cooled EGR |
| Number of cylinders | 6 |
| Bore | 5.51 in |
| Stroke | 6.5 in |
| Piston displacement | 928 in3 |
| Horsepower: | |
| SAE J1995 | 473 HP |
| ISO 9249 / SAE J1349 | 466 HP |
| Rated rpm | 2,000 rpm |
| Fan drive type | Hydraulic |
| Maximum torque | 1669 ft.-lbs. |
| Fuel system | Direct injection |
| Governor | Electronically controlled |
| Lubrication system: | |
| Method | Gear pump, force-lubrication |
| Filter | Full-flow type |
| Air cleaner | Dry type with double elements and precleaner (cyclonpack type), plus dust indicator |
*EPA Tier 4 Final emissions certified
| Torque converter | 3-elements, 1-stage, 2-phase |
| Transmission | Full-automatic, counter-shaft type |
| Speed range | 6 speeds forward and 2 reverse |
| Lockup clutch | Wet, single-disc 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 gear |
| Shift control | Electronic shift control with automatic clutch modulation in all gear |
| Maximum travel speed | 34.7 mph |
| Full time all wheel drive | |
| Final drive type | Planetary gear |
| Ratios: | |
| Differential | 3.727 |
| Planetary | 4.941 |
| Front | Hydro-pneumatic suspension |
| Rear | Combined hydro-pneumatic and rubber suspension system |
| Type | Articulated type, fully hydraulic power steering with two double-acting cylinders |
| Supplementary steering | Automatically actuated, electrically powered |
| Standard | ISO5010, SAE J1511 |
| Minimum turning radius, wall to wall | 28 ft. 10 in |
| Articulation angle | 45° each direction |
| Standard | ISO3449 (FOPS) ISO3471 (ROPS) |
| Service brakes | Full-hydraulic control, oil-cooled multiple-disc type on front and center axles |
| Standard | ISO3450 |
| Parking brake | Spring applied, caliper disc type |
| Retarder | Front and center axle brakes act as retarder |
Main frame
| Type | Articulated type, box-sectioned construction on front and rear Connected by strong torque tubes. |
Body
| Capacity: | |
| Struck | 23.8 yd3 |
| Heaped (2:1, SAE) | 31.4 yd3 |
| Payload | 44.1 US tons |
| Material - high tensile strength steel | 184,925 psi |
| Material thickness: | |
| Bottom | 0.63 in |
| Front | 0.31 in |
| Sides | 0.47 in |
| Target area - (inside length x width) | 18 ft. 7 in x 10 ft. 6 in |
| Heating | Exhaust heating (option) |
Hydraulic system
| Hoist cylinder | Twin, telescopic type |
| Relief pressure | 4,119 psi |
| Hoist time | 12.0 s |
Weight (approximate)
| Empty weight | 77,283 lbs. | |
| Gross vehicle weight | 165,644 lbs. | |
| Weight distribution: | ||
| Empty: | Front axle | 56.9% |
| Center axle | 23.6% | |
| Rear axles | 19.5% | |
| Loaded: | Front axle | 30.4% |
| Center axle | 35.8% | |
| Rear axles | 33.8% |
Tires
| Standard tire | 29.5 R25 |
Service refill capacities
| Fuel tank | 138.7 US gal |
| DEF tank | 9.0 US gal |
| Engine oil | 13.2 US gal |
| Torque converter, transmission and retarder cooling | 33 US gal |
| Differentials (total) | 28.5 US gal |
| Final drives (total) | 8.5 US gal |
| Hydraulic system | 44.1 US gal |
| Suspension (total) | 5.7 US gal |
ENGINE:
- Air cleaner: dry type with double elements and pre-cleaner, plus dust indicator
- Alternator, 24 V / 90 A
- Batteries, 2 x 12 V / 160 Ah, 910 CCA
- Engine, Komatsu SAA6D140E-7 (with EGR)
- Hydraulically driven reversible cooling fan, after cooler
- Hydraulically driven reversible cooling fan, radiator
- Komatsu Diesel Particulate Filter (KDPF)
- Komatsu Variable Displacement Turbocharger
- Selective Catalytic Reduction (SCR)
- Starting motor, 11.0 kW
- Two mode power system (Power and Economy)
CAB:
- 2 x DC12V electrical outlets
- Air conditioner
- AM/FM radio with AUX terminal
- Ashtray
- Cigarette lighter
- Color rear view monitor
- Cup holder
- Front wiper (with washer and intermittent)
- Machine monitor (color LCD)
- Operator seat, heated , reclining, air suspension type with 3-point retractable seat belt
- Passenger seat with 2-point retractable seat belt
- Power window (L.H)
- Rear wiper (with washer)
- Space for lunch box
- Steering wheel, tilt and telescopic
- Sun visor, front window
- Tiltable ROPS cab with FOPS, sound suppression type
LIGHTING SYSTEM:
- Back-up lamp
- Back work lamps, LH and RH side
- Front, cab mounted work lamps
- Hazard lamps
- Head lamps (High/Low)
- LED stop, tail and turn signal lamps
GUARD AND COVERS:
- Engine underguard
- Exhaust muffler thermal guard
- Fire prevention covers
- Propeller shaft guards, front and rear
- Transmission underguard
BODY:
- Electronic hoist control system
TIRES:
- 29.5 R25
OTHER:
- Alarm, backup
- Anti-slip material on fenders
- Auto idle stop function
- Back-up alarm
- Battery disconnect switch
- Centralized greasing
- Coolant temperature alarm and lamp
- Dump counter
- Ecology guidance and ecology gauge
- Electric circuit breakers, 24 V
- Electric priming fuel pump
- Engine shutdown secondary switch
- Full-automatic F6-R2 transmission with lock-up torque converter & K-ATOMiC shift control
- Guard rails
- Horn, electric
- Hydropneumatic suspension, front and rear
- Komatsu Traction Control System (KTCS)
- KOMTRAX Level 5
- Mud guards
- Parking brake
- Payload Meter (PLM)
- Power cab tilt
- Protective grille for rear window
- Provision for tailgate installation
- Heated rear view mirrors
- Rear view monitoring system
- Retarder/brake system
- Secondary brake
- Secondary engine shutdown switch
- Secondary steering, automatic, electric
- Side markers
- Steering joint locking assembly
- Step (right side) and ladder (left side)
- Tool box
- Under view mirrors
- Body, 31.4 yd3, SAE 2:1 heaped, unlined floor
- Body, with exhaust heating ducting, 31.4 yd3, SAE 2:1 heaped, unlined floor
- Spare rim, for 29.5 x 25 tire (1 rim only)
- Tail gate, scissor type
Features and benefits
Komatsu Traction Control System
Monitor and adjust to changing conditions. Komatsu Traction Control System (KTCS) is designed to provide excellent machine performance in soft and slippery ground conditions without sacrificing steering performance.
Maximize transmission life
Powerful acceleration, smooth down shifting and synchronized engine speed. The K-ATOMiCS transmission features a six-speed, fully automatic transmission with an advanced electronic system to reduce shift shock and torque cutoff for exceptional efficiency.
Greater confidence when traveling downhill
Increase operator confidence when traveling down hill through large capacity, continuously cooled, wet multiple-disk brakes that also function as a highly responsive retarder with 684 horsepower absorption capacity.
Smooth ride over rough terrain
Discover a smooth ride over the rough terrain with front and rear axle hydro-pneumatic suspensions. The rear axles are mounted on a dynamic equalizer structure and the entire system is designed to help reduce operator fatigue while offering a comfortable ride.
Comfortable operator environment
Improved cab entry in front of the front axle. A curved front dash panel. Thoughtful design enhancements throughout the cab provide the operator excellent visibility and a large, quiet environment to promote productivity and comfort.
Efficient loading
Monitor production with a standard, integrated payload meter that displays loaded material weight on the LCD monitor inside the cab. External lamps illuminate green, yellow or red as the payload increases to help prevent under and over loaded haul cycles.