Komatsu HM300-5
Series: Komatsu Articulated Dump Truck
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Komatsu articulated dump trucks HA250 to HM400 – the number as payload in tenths of a tonne: HA of the 1990s, HM300 to HM400 since 2001, generations -1 to -5, SAA6D125 and SAA6D140 engines, 179 to 334 kW
Komatsu's articulated haulers carry two codes: HA for the range of the 1990s (HA250-3, HA270-3) and HM for the generation from 2001 (HM300, HM350, HM400), with which Komatsu seriously attacked the market of the 30 to 40 tonners. The number gives the payload in tenths of a tonne – HM300 carries about 30 t, HM350 35 t, HM400 40 t – the digit after the hyphen the generation from -1 to -5, where the -5 brings Stage IV; M0 is a market variant. The engines are Komatsu's own six-cylinders from the excavator programme: S6D125 and SAA6D125 with 11 litres in the HM300, SAA6D140 with 15.2 litres in the HM350 and HM400.
Read on 3 more paragraphs
The register lists 12 versions with 179 to 334.1 kW from six-cylinders of 11,001 to 15,242 cm³, torque from 1,600 to 1,990 Nm at 2,000 to 2,200 rpm, lengths from 9,303 to 11,302 mm, widths from 2,502 to 3,536 mm and heights from 3,340 to 6,520 mm.
Komatsu's hallmarks are drive to all six wheels with engageable locks, traction control that regulates wheel slip via the brakes and the powershift transmission with lock-up converter; the HM400s run in quarries, earthworks and small open-pit mines where rigid-frame trucks have too little ground clearance.
On used trucks, operating hours, play in articulation joint and oscillation bearings, the condition of body cylinders, brakes and transmission and the tyres, which are the biggest cost item on these vehicles, are what count; parts run through Komatsu dealers worldwide.
Sources: SpecCodex register, model data: Komatsu knickgelenkte Muldenkipper, Komatsu Europe knickgelenkte Muldenkipper (manufacturer)
Technical data
Engine
| Engine make | Komatsucorrect |
|---|---|
| Engine model | SAA6D125E-7correct |
| Power | 337.2 hp (242.1 kW)correct |
| Rated speed | 2,000 rpmcorrect |
| Cylinders | 6correct |
| Displacement | 11,041.6 cm³correct |
| Engine oil capacity | 35.2 lcorrect |
Dimensions and weights
| Length | 10,277.9 mmcorrect |
|---|---|
| Width | 2,901.7 mmcorrect |
| Height | 3,620 mmcorrect |
| Wheelbase | 4,102.6 mmcorrect |
| Ground clearance | 576.1 mmcorrect |
Drivetrain and chassis
| Gearbox type | Full-automatic gearbox, Counter-shaft typecorrect |
|---|---|
| Forward gears | 6correct |
| Reverse gears | 6correct |
| Tyre size | 23.5 R25correct |
| Top speed | 58.7 km/hcorrect |
Working data
| Hydraulic oil capacity | 103.3 lcorrect |
|---|---|
| Hydraulic pressure | 294 barcorrect |
| Fuel tank capacity | 388 lcorrect |
Frequently asked questions
How much power does the Komatsu HM300-5 have?
The Komatsu HM300-5 delivers 337 hp.
What engine does the Komatsu HM300-5 have?
6 cylinders, 11,042 cm³ displacement.
How fast does the Komatsu HM300-5 go?
Top speed is 58.7 km/h.
What are the dimensions of the Komatsu HM300-5?
10,278 mm × 2,902 mm × 3,620 mm.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 120 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
Sources: Manufacturer documentation, komatsu.com (retrieved August 2026) · RitchieSpecs equipment specifications (retrieved August 2026) · How we check the data
Dump truck in 3D section
Turn the model, look inside and click an assembly — each one is explained.
