Construction Equipment Guide
470 Maryland Drive
Fort Washington, PA 19034
800-523-2200
Komatsu HM300-5 is a rigid-frame off-highway haul truck designed for earthmoving, quarry, and mining applications. It is part of Komatsu's HM series and is used to transport large volumes of material over rough terrain. The HM300-5 typically features a high-capacity dump body, all-wheel drive, and a suspension system suited for uneven jobsite conditions. It is commonly paired with excavators and wheel loaders in loading and hauling operations. The model is known for its operator cab, payload efficiency, and service access. Komatsu HM300-5 is used in construction, aggregate, and site development fleets.
| Articulated/Rigid | Articulated Starting 2024 Model Year |
| Drive Configuration | 6WD Starting 2019 Model Year |
| Drive System Mech/Electr. | Mech Starting 2025 Model Year |
| Engine Type | Komatsu SAA6D125E-7 Starting 2019 Model Year |
| Mfg. Model | HM300-5 Starting 2019 Model Year |
| Off-Highway Trucks | Off-Highway Trucks Starting 2025 Model Year |
| Operating Weight lbs (kg) | 117,892 (53,475) Starting 2019 Model Year |
| Rated Payload Tons (Metric Tons) | 30.9+E6 (28) Starting 2021 Model Year |
| Articulating/Rigid | Articulated |
| Dump Ground Clearance | 2.00 ft (0.61 m) |
| Dump Height | 21.20 ft (6.46 m) |
| Ground Clearance | 1.90 ft (0.58 m) |
| Overall Height | 11.90 ft (3.63 m) |
| Overall Length | 33.80 ft (10.30 m) |
| Overall Width | 9.60 ft (2.93 m) |
| Wheelbase | 13.50 ft (4.11 m) |
| Drive Config | 6WD |
| Capacity - Heaped | 22.40 cu yd (17.13 cu m) |
| Capacity - Struck | 17.60 cu yd (13.46 cu m) |
| Rated Payload | 56,000.10 lbs (25,401.25 kg) |
| Bore | 5.00 in (12.70 cm) |
| Displacement | 673.80 cu in (11,041.63 cu cm) |
| Engine Model | SAA6D125E-7 |
| Gross Power | 332.60 hp (248.02 kw) |
| Make | Komatsu |
| Max Torque | 1.30 lbs ft (1.76 nm) |
| Net Power | 324.60 hp (242.06 kw) |
| Number of Cylinders | 6 |
| Power Measured @ | 2000 rpm |
| Stroke | 6.00 in (15.24 cm) |
| Engine Oil Capacity | 9.30 gal (35.20 l) |
| Fuel Capacity | 102.50 gal (387.96 l) |
| Hydraulic System Fluid Capacity | 27.30 gal (103.33 l) |
| Tire Size | 23.5 R25 |
| Transmission Fluid Capacity | 25.90 gal (98.03 l) |
| Max Speed | 36.50 mph (58.74 kph) |
| Number of Forward Gears | 6 |
| Number of Reverse Gears | 6 |
| Transmission Type | Full-automatic Counter-shaft type |
| Center Axle - empty | 22.50 lbs (10.21 kg) |
| Center Axle - loaded | 36.00 lbs (16.33 kg) |
| Front Axle - loaded | 31.00 lbs (14.06 kg) |
| Operating Weight | 117,881.00 lbs (53,469.99 kg) |
| Rear Axle - empty | 18.50 lbs (8.39 kg) |
| Rear Axle - loaded | 33.00 lbs (14.97 kg) |
| Total Empty | 56.00 lbs (25.40 kg) |
| Total Loaded | 117.90 lbs (53.48 kg) |