Komatsu PC128US-1
Series: Komatsu Hydraulic Excavator
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 PC — what the number and dash figure actually tell you
Anyone typing “Komatsu PC120” or “PC100” is usually trying to decode the label: PC is Komatsu's crawler-excavator designation, the following number places the model roughly in a size class, and a dash number at the end marks the generation.
Read on 4 more paragraphs
Recent generations run under labels such as -8, -10 or -11; each update brings a revised engine, hydraulics and cab plus tighter emissions rules, while the base number stays the same. The added letter LC marks a widened, lengthened undercarriage that spreads more contact area on soft soil.
Alongside the PC line, Komatsu also sells models such as H135S, H455S or H655S, a separate family for very large open-pit excavators tracing back to the earlier partnership with German manufacturer Demag. Its letter-and-number logic follows its own rules and does not map onto the PC models.
The “Komatsu Hydraulic Excavator” collective entry holds both families side by side, from compact excavators starting around 53 kW up to the large H-series machines. When buying used, check the hour meter along with track rollers, chain tension and cylinder seals.
In short: the number after PC signals the size class, the dash number the generation, and models like PC100, PC120 or H655S show how wide a range sits under one register entry.
Sources: Kennwerte der Modelle Komatsu Hydraulic Excavator, Bagger-Typenschluessel im Herstellervergleich, Komatsu Seriennummern- und Generationen-Leitfaden, Demag-Komatsu H655S, Museumsarchiv
Technical data
Engine
| Engine model | S4D102Ecorrect |
|---|---|
| Power | 87.1 hp (64.1 kW)correct |
| Rated speed | 2,200 rpmcorrect |
| Cylinders | 4correct |
| Displacement | 3,921.4 cm³correct |
Dimensions and weights
| Ground clearance | 417.6correct |
|---|---|
| Unladen weight | 12,700 kgcorrect |
Working data
| Pump flow | 226.4 l/mincorrect |
|---|---|
| Hydraulic oil capacity | 122.3 lcorrect |
| Hydraulic pressure | 348.2 barcorrect |
| Fuel tank capacity | 135.1 lcorrect |
Other data
| Cab height | 2,776.7correct |
|---|
More machines with this engine (S4D102E, 19)
Where this model stands
Power-to-weight ratio: 5 kW/t (64 kW / 12.7 t)
Stronger than 20% of the excavators & compaction in the register — out of 1,666 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Komatsu PC128US-1 have?
The Komatsu PC128US-1 delivers 87.1 hp.
How much does the Komatsu PC128US-1 weigh?
The unladen weight is 12,700 kg.
What engine does the Komatsu PC128US-1 have?
4 cylinders, 3,921 cm³ displacement.
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.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
Request a quote →
We ask the suppliers and come back with price and lead time.
Request spare parts →
This page carries 13 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.
Missing a figure you were looking for? Report it →
Know this machine better? Have a photo, a manual, or know that a figure is wrong? Add it to the register →
Other models in this series
Sources: [1]
Excavator in 3D section
Turn the model, look inside and click an assembly — each one is explained.