Komatsu HM400-3

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The 44 ton capacity HM400-3 has a Tier 4 interim Komatsu engine which, combine with other energy saving improvements, can reduce fuel consumption up to 14%. The Komatsu Traction Control System ensures that a loaded HM400-3 will be able to pull through the most severe underfoot conditions. The operator can choose between Economy and Power modes to further tailor his machine performance to the job at hand. Among the cab improvements are a forward facing training seat and separate screen for the rear view camera.


Model   Komatsu SAA6D140E-6*
Type   Water-cooled, 4-cycle
Aspiration   Komatsu variable geometry, turbo-charged, after-cooled, cooled EGR
Number of cylinders   6
Bore 5.51" 140 mm
Stroke 6.5" 165 mm
Piston displacement 928 in3 15.24 ltr
Horsepower :    
SAE J1995 473 HP 353 kW
ISO 9249 / SAE J1349 469 HP 350 kW
Rated rpm   2000 rpm
Fan drive type   Hydraulic
Maximum torque 1669 ft lbs 2263 Nユm
231 kgユm    
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
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 55.9 km/h
Full time all wheel drive    
Final drive type Planetary gear  
Differential 3.727  
Planetary 4.941  
Suspension System    
Front Hydro-pneumatic suspension  
Rear Combined hydro-pneumatic and rubber suspension system  
Steering 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' 10" 8.8 m
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.  
Struck16.9 23.8 yd3 18.2 m3
Heaped (2:1, SAE) 31.4 yd3 24 m3
Payload 44.1 U.S. tons 40 metric tons
Material - high tensile strength steel 184,925 psi 130 kg/mm2
Material thickness:    
Bottom 0.55" 14 mm
Front 0.31" 8 mm
Sides 0.47" 12 mm
Target area - (inside length x width) 18' 7" x 10' 6" 5667 mm x 3194 mm
Heating   Exhaust heating (optional)
Hydraulic System    
Hoist cylinder   Twin, telescopic type
Relief pressure 4264 psi 275 kg/cm2 / 27 Mpa
Hoist time   12.0 sec
Weight (approximate)    
Empty weight 74,207 lbs 33,660 kg
Gross vehicle weight 162,569 lbs 73,740 kg
Weight distribution:    
Front axle   56.40%
Center axle   22.50%
Rear axles   21.10%
Front axle   29.40%
Center axle   35.40%
Rear axles   35.20%
Standard tire 29.5 R25  
Service Refill Capacities    
Fuel tank 136.8 U.S. gal 518 L
Engine oil 9.3 U.S. gal 35 L
Torque converter, transmission and retarder cooling 33 U.S. gal 125 L
Differentials (total) 28.5 U.S. gal 108 L
Final drives (total) 8.5 U.S. gal 32 L
Hydraulic system 44.1 U.S. gal 167 L
Suspension (total) 5.7 U.S. gal 21.4 L