Komatsu HD785-7
Series: Komatsu Rock Truck
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The Komatsu HD785-7 is a mechanical-drive haul truck of the Komatsu Rock Truck series with a payload of 91.7 tonnes. It is intended for use in quarries, mining and on large earthmoving sites.
The SAA12V140E-3 engine has twelve cylinders and 30,481.6 cm³ displacement, works with a turbocharger and aftercooling and turns at a rated speed of 1,900 rpm. Top speed is 65 km/h.
The dimensions include 11,015.5 mm length, 5,050 mm height, a 4,953 mm wheelbase and a 10,100 mm turning radius. Compared with the smaller HD models with six cylinders, the HD785-7 is laid out much stronger thanks to its twelve-cylinder V engine. The type designation SAA12V140E-3 reveals the design: twelve cylinders in V arrangement. For spare parts this engine type together with the model HD785-7 is the safe search term.
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.
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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 | SAA12V140E-3correct |
|---|---|
| Rated speed | 1,900 rpmcorrect |
| Cylinders | 12correct |
| Displacement | 30,481.6 cm³correct |
| Aspiration | Turbo-charged, after-cooledcorrect |
Dimensions and weights
| Length | 11,015.5 mmcorrect |
|---|---|
| Height | 5,050 mmcorrect |
| Wheelbase | 4,953 mmcorrect |
Drivetrain and chassis
| Top speed | 65 km/hcorrect |
|---|---|
| Turning radius | 10,100 mmcorrect |
More machines with this engine (SAA12V140E-3, 5)
Frequently asked questions
What engine does the Komatsu HD785-7 have?
12 cylinders, 30,482 cm³ displacement.
How fast does the Komatsu HD785-7 go?
Top speed is 65 km/h.
What are the dimensions of the Komatsu HD785-7?
11,016 mm × 5,050 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 10 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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