Komatsu D85A-21 – specifications
Series: Komatsu Crawler Loader
Build year not documented · Data origin: Directory data · sources
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 D20 to D45 — what S, Q, and the number after the dash mean
The “Komatsu Crawler Loader” bucket holds track loaders of several size classes from different decades side by side, from the D10 line up to the D45 models. Komatsu primarily organises its tracked machines by the number after the “D”: it denotes the size class, regardless of whether a given chassis left the factory as a bulldozer or — as here — as a crawler loader with a front bucket.
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The letter that follows distinguishes the configuration: on Komatsu's plain dozers, A marks a standard-width undercarriage and P a wider, lower-ground-pressure one; on the models recorded here, S marks the loader version fitted with a bucket instead of a blade, and Q marks further equipment variants within the same size class.
The number after the dash counts the technical generation: within the D20/D21 line, “-5” denotes units built before 1985, while later versions run through “-7” and “-8”. For other size classes such as D10, that numbering starts over independently — D10S-1 and D10S-2 are the first two generations of that smaller class.
The values recorded at SpecCodex show just how wide this bucket really is: engine power ranges from 14 to 261 kW, operating weight from 1,770 to 41,798 kilograms, displacement from 1,301 to 19,254 cm³ — from a small yard machine up to heavy construction equipment.
When buying used, the undercarriage matters most: track links, rollers and drive sprockets wear faster on crawler loaders than on plain dozers, alongside play in the loader-arm and bucket pins. Model and build year are only confirmed by the serial plate.
Sources: SpecCodex register, model data: Komatsu Crawler Loader, - Komatsu Dozer Models Explained
Versions of this model in the register
Each row is a separate entry with its own data. The figures on this page belong to the row marked ●.
| Version | Built | kW | EU type approval | Origin |
|---|---|---|---|---|
| D85A-21 | — | 170 | — | Directory data |
| ● D85A-21 | — | — | — | Directory data |
Technical data
Engine
| Engine model | S6D125Ecorrect |
|---|---|
| Displacement | 11,044.9 cm³correct |
Dimensions and weights
| Unladen weight | 18,710 kgcorrect |
|---|
Drivetrain and chassis
| Top speed | 11.9 km/hcorrect |
|---|
Working data
| Fuel tank capacity | 480.4 lcorrect |
|---|
Other data
| Cab height | 2,511.6 mmcorrect |
|---|
More machines with this engine (S6D125E, 4)
Frequently asked questions
How much does the Komatsu D85A-21 weigh?
The unladen weight is 18,710 kg.
What engine does the Komatsu D85A-21 have?
11,045 cm³ displacement.
How fast does the Komatsu D85A-21 go?
Top speed is 11.9 km/h.
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.
- Check the weights in the papers against the figures here — attachments change them.
- 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 6 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) · Data sources and cross-checks
Wheel loader in 3D section
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