KOMATSU HM300-5
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2026
Komatsu
HM300-5
New
Durability and performance in one
When it comes to maximizing your productivity, the HM300-5 delivers maneuverability, comfort and durability in one — even in harsh conditions. Automated powertrain features allow consistent cycle times from all operator experience levels.
- Excellent maneuverability
- Automated powertrain features
- Designed for durability
Engine
| Model | Komatsu SAA6D125E-7* |
| Type | Water-cooled, 4-cycle |
| Aspiration | Turbo-charged, after-cooled, cooled EGR |
| Number of cylinders | 6 |
| Bore | 4.92 in |
| Stroke | 5.91 in |
| Piston displacement | 671 in3 |
| Horsepower : | |
| SAE J1995 | 332 HP |
| ISO 9249 / SAE J1349 | 324 HP |
| Rated rpm | 2,000 rpm |
| Fan drive type | Hydraulic driven |
| Maximum torque | 1,237 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, 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 | 36.4 mph |
Full time all wheel drive with Komatsu Traction Control System (K-TCS)
| Final drive type | Planetary gear |
| Ratios: | |
| Differential | 3.154 |
| Planetary | 4.667 |
| 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 | 26 ft. 7 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: | |
| Struck16.9 | 17.5 yd3 |
| Heaped (2:1, SAE) | 22.4 yd3 |
| Payload | 30.9 US tons |
| Material - high tensile strength steel | 184,925 psi |
| Material thickness: | |
| Bottom | 0.55 in |
| Front | 0.31 in |
| Sides | 0.47 in |
| Target area - (inside length x width) | 17 ft. 3 in x 8 ft. 10 in |
| Heating | Exhaust heating (optional) |
Hydraulic system
| Hoist cylinder | Twin, telescopic type |
| Relief pressure | 4,264 psi |
| Hoist time | 10.5 s |
Weight (approximate)
| Empty weight | 55,986 lbs. |
| Gross vehicle weight | 117,892 lbs. |
| Weight distribution: | |
| Empty: | |
| Front axle | 58.9% |
| Center axle | 22.5% |
| Rear axles | 18.6% |
| Loaded: | |
| Front axle | 30.8% |
| Center axle | 36.0% |
| Rear axles | 33.2% |
Tires
Standard tire
23.5 R25
Service refill capacities
| Fuel tank | 102.5 US gal |
| DEF tank | 8.7 US gal |
| Engine oil | 9.2 US gal |
| Torque converter, transmission and retarder cooling |
21.1 US gal |
| Differentials (total) | 18.9 US gal |
| Final drives (total) | 6.1 US gal |
| Hydraulic system | 27.2 US gal |
| Suspension (total) | 2.7 US gal |
- Air cleaner, dry type, double elements
- Air cleaner dust level indicator
- Air pre-cleaner
- Alternator, 90 A, 24 V
- Alarm, backup
- Anti-slip material on fenders
- Auxiliary steering system, automatic, electric
- Back-up lamp
- Batteries, 2 x 12 V/200 Ah
- Battery disconnect
- Centralized greasing
- Color rear view camera and monitor
- Coolant temperature alarm and lamp
- Dump counter
- ECO Guidance
- Electronic hoist control system
- Electric circuit breaker, 24 V
- Electric priming fuel pump
- Electronic pump for hydraulic tilt cab
- Engine, Komatsu SAA6D125E-7
- Engine underguard
- Engine shutdown secondary switch
- Front view mirror
- Full-automatic F6-R2 transmission with lock-up torque converter & K-ATOMiC shift control
- Hazard lamps
- Hand rails for platform and ladder
- Headlights, front (high and low)
- Heated rearview mirrors, LH and RH side
- Horn, electric
- Hydraulic driven cooling fan, for after cooler
- Hydraulic driven cooling fan, for radiator
- Hydropneumatic suspension, front and rear
- Interaxle lockup, wet disc clutch type, controlled by KTCS
- Komatsu Traction Control System (KTCS)
- Komatsu Diesel Particulate Filter (KDPF)
- Komatsu Variable Geometry Turbocharger (KVGT)
- KOMTRAX®
- Ladders LH side
- Mud guards
- Parking brake
- Payload Meter (PLM)
- Protective grille for rear window
- Propeller shaft guards, front and rear
- Provision for tailgate
- Retarder/brake system
- Rims for 23.5 x 25, set of 6
- ROPS/FOPS cab Level 2
--2 x DC12V electrical outlets
--12V cigarette lighter
--Air conditioner/Heater/Defroster
--Ashtray
--Color LCD/TFT multi-monitor
--Cup holder
--Floor mat
--Operator seat, reclining, air suspension type with 3-point retractable seat belt, 3" width lap belt, 2" width shoulder belt
--Passenger seat with 2-point retractable seat belt, 3" width
--Power window (LH)
--Space for lunch box
--Sliding window (RH)
--Steering wheel, tilt and telescopic
--Sun visor, front window
--Tiltable ROPS cab with FOPS, sound suppression type
--Windshield washer and wiper, front and rear - Selective Catalytic Reduction (SCR) system
- Starting motor, 7.5 kW
- Steering joint locking assembly
- Step (right side)
- Stop, tail, and turn signal lamps (LED)
- Tool box
- Transmission underguard
- Two mode engine power system (Economy and Power)
- Work lamps, LH and RH side
- 23.5 x 25 tires
- 750/65 R25 rims
- 750/65 R25 tires
- Body, 22.4 yd3
- Body, exhaust heated, 22.4 yd3
- Tail gate, scissors 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 526 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.