Komatsu HM300-3

Double tap to zoom



An operator who likes cycle quickly through any ground conditions and do it in comfort will love the HM300-3. Komatsu Traction Control System coupled to the power of the Tier 4 interim Komatsu engine and two working modes give the operator the tools they’ll need and to complete their job efficiently and profitably. A center located air suspension operator seat, a forward facing training seat, separate rear view monitor, and large LED multi-language monitor Provide the operator what he needs to operate productively in comfort for his full shift.


Model   Komatsu SAA6D125E-6*
Type   Water-cooled, 4-cycle
Aspiration   Komatsu variable geometry, turbo-charged, after-cooled, cooled EGR
Number of cylinders   6
Bore 4.92" 125 mm
Stroke 5.91" 150 mm
Piston displacement 674 in3 11.04 ltr
Horsepower :    
SAE J1995 332 HP 248 kW
ISO 9249 / SAE J1349 324 HP 242 kW
Rated rpm   2000 rpm
Fan drive type   Hydraulic
Maximum torque 1239 ft lbs 1680 N•m
71 kg•m    
Fuel system   Direct injection
Governor   Electronically controlled
Lubrication system:    
Method   Gear pump, force-lubrication
Filter   Full-flow type
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 36.4 mph 58.6 km/h
Full time all wheel drive    
Final drive type Planetary gear  
Differential 3.154  
Planetary 4.667  
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
Minimum turning radius, wall to wall 26'7" 8.10 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  
Struck16.9 17.5 yd3 13.4 m3
Heaped (2:1, SAE) 22.4 yd3 17.1 m3
Payload 30.9 U.S. tons 28.0 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) 17'3" x 8'10" 5250 mm x 2685 mm
Hydraulic System    
Hoist cylinder   Twin, telescopic type
Relief pressure 4264 psi 300 kg/cm2 / 29.4 Mpa
Hoist time   10.5 sec
Weight (approximate)    
Empty weight 54,917 lbs 24,910 kg
Gross vehicle weight 116,823 lbs 52,990 kg
Weight distribution:    
Front axle   57.00%
Center axle   23.00%
Rear axles   20.00%
Front axle   29.00%
Center axle   36.50%
Rear axles   34.50%
Standard tire 23.5 R25  
Service Refill Capacities    
Fuel tank 102.6 U.S. gal 388.3 L
Engine oil 9.2 U.S. gal 35 L
Torque converter, transmission and retarder cooling 25.9 U.S. gal 98 L
Differentials (total) 18.9 U.S. gal 71.5 L
Final drives (total) 6.1 U.S. gal 23 L
Hydraulic system 27.2 U.S. gal 103 L
Suspension (total) 2.7 U.S. gal 10.4 L