Komatsu HD785-5
Series: Komatsu Rock Truck
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Komatsu Rock Truck HD785 to 960E: rigid haulers split between mechanical and electric drive, 171 to 2,495 kW, 6 to 18 cylinders
At Komatsu, "HD" marks the classic rigid-frame dump trucks with mechanical drivetrains, while the model number indicates payload class: the HD785 carries a manufacturer-rated payload of 92.2 tonnes. Models with the "E" suffix, such as the 830E, 930E and 960E, use diesel-electric drive instead – the diesel engine powers a generator that feeds two wheel motors on the rear axle through cabling, with no mechanical transmission.
Read on 4 more paragraphs
The number after the dash, as in 730E-7 versus 730E-8, marks the build generation. The "Komatsu Rock Truck" bucket here groups 35 live-listed models across both drive types, from smaller rigid HD haulers to the largest electric-drive trucks.
The technical spread is wide: among 33 models with recorded displacement, values run from 12,175 to 78,000 cm³, and cylinder count among 25 models spans 6 to 18 – figures consistent with the huge drive engines used in electric haulers. Among 19 models with recorded power, output ranges from 171 to 2,495 kW.
Buying used, operating hours and the engine's service history matter most; on diesel-electric models, also check the traction alternator and wheel motors. Models such as 830E, HD780, 730E-8 and 930E-4 appear across the listed inventory.
Generation (the dash number), drive type (the E suffix or its absence) and payload class (the model number) together make up the full code of a Komatsu haul truck.
Sources: SpecCodex register, model data: Komatsu Rock Truck, – Komatsu Muldenkipper HD785-8 (Nenn-Nutzlast 92,2 t), – Komatsu 830E (dieselelektrischer Antrieb) (Wikipedia)
Technical data
Engine
| Engine model | SAA12V140ZE-2correct |
|---|---|
| Power | 1,056.5 hp (777 kW)correct |
| Cylinders | 12correct |
| Displacement | 30,496.3 cm³correct |
| Coolant capacity | 227.1 lcorrect |
| Engine oil capacity | 140.1 lcorrect |
Dimensions and weights
| Length | 10,616.2 mmcorrect |
|---|---|
| Width | 5,663.2 mmcorrect |
| Height | 5,260 mmcorrect |
| Ground clearance | 780.3 mmcorrect |
Drivetrain and chassis
| Gearbox type | Komatsu 7-speed, electronically-controlled, automatic gearbox powershift transmission transmissioncorrect |
|---|---|
| Top speed | 64.7 km/hcorrect |
Working data
| Fuel tank capacity | 1,249.2 lcorrect |
|---|
More machines with this engine (SAA12V140ZE-2, 2)
Frequently asked questions
How much power does the Komatsu HD785-5 have?
The Komatsu HD785-5 delivers 1,056 hp.
What engine does the Komatsu HD785-5 have?
12 cylinders, 30,496 cm³ displacement.
How fast does the Komatsu HD785-5 go?
Top speed is 64.7 km/h.
What are the dimensions of the Komatsu HD785-5?
10,616 mm × 5,663 mm × 5,260 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.
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This page carries 14 individual figures for this model. They come from 1 recorded source; 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: 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.
