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Komatsu PC138US: short-tail excavator and review
Komatsu PC138 — a 13–14 ton class crawler excavator, often sold with a short-tail swing (US). We look at the -8, -10, and -11 series, key features, and what to check when buying a used PC138.
PC138 in brief
PC138US — a mid-size excavator with a tail that doesn't stick out much during swing. This makes it ideal for urban construction, road repairs, utility trenching, and other tight spaces where buildings or traffic are nearby.
Operating weight around 13–14 tons, so the machine can still be transported on a standard heavy-duty trailer. In the used market, this machine is valued for its versatility and reliability.
Series — what's the difference
PC138US-8 is an older, simpler generation; the -10 version features a more stringent emissions-compliant engine and improved hydraulics; the -11 version has a more modern cab and advanced electronics.
Often offered versions with additional hydraulic lines for a breaker, quick coupler, rotating seat (tiltrotator), and weighing system. It's worth checking what equipment is actually fitted.
Engines and key components
The PC138 is powered by a four-cylinder Komatsu diesel engine with around 100 HP. Newer versions feature SCR (AdBlue) and particulate filter systems, whose condition is important to the buyer.
Key components: hydraulic pump and valve block, swing reducer and gear, crawler undercarriage, boom with arm and bucket, quick coupler.
What to check when buying a used PC138
Check the engine hours and service history, look for smoke, oil leaks, or if the hydraulic pressure is stable. If there's KOMTRAX, compare the data with the instrument cluster readings.
Inspect the suspension wear, play in the steering rack and tie rods, steering wheel alignment, and the condition of the quick release. Feel if the machine has worked a lot with a hammer — this wears out the hydraulics faster.
Versions and trims
Names and equipment vary by market and year of production; we list the versions most commonly found in Europe.
PC138US-8
-8 seriesAn older but still popular generation.
- Often — simpler electronics
- Lower price in the used market
- A thorough vehicle inspection is essential
PC138US-10
-10 seriesA modern generation with a more economical engine.
- Often — SCR and particulate filter
- More comfortable cabin
- Often — KOMTRAX
PC138US-11
-11 seriesNewer generation with more advanced electronics.
- Larger screen
- Often — advanced control system
- More efficient hydraulics
PC138US su tiltrotatoriumi
depending on the trimWith a swivel seat for versatile tasks.
- Additional hydraulic lines
- Often — quick coupling
- Check the condition of the rotary
Comparison of PC138US versions
| PC138US-8 | PC138US-10 | PC138US-11 | |
|---|---|---|---|
| Who it's for | For budget work | For daily city work | For intensive and modern work regimes |
| Engine technology | Older | Modern | Latest |
| Electronics | Basic | Mid-range | Advanced |
| Price in the used market (relatively) | Budget-friendly | Mid-priced | Premium |
For city driving and tight spaces, the PC138US is one of the best choices. The -8 is great for budget buyers with a good history, while for heavy-duty work, look for the -10 or -11.
Pros
- Short rear swing for tight spaces
- Reliable Komatsu machinery
- A good selection of parts and service options
- Suitable for general city work
Cons
- Less pulling power than larger trucks
- Newer versions with SCR and particulate filters require maintenance
- Expensive vehicle upkeep
Frequently asked questions
What does US mean in PC138?
The US denotes a short rear swing (ultra short tail swing): the truck's rear end doesn't stick out much during turns, making it easy to manoeuvre in tight spaces.
What is the weight of the PC138US?
The operating weight is usually around 13–14 tonnes, depending on the series and specification. Check the exact weight in the documentation.
Is it worth buying a PC138 with a pivot turntable?
Yes, if you need versatility for your work, but the condition of the turntable and additional hydraulics must be good. It's essential to test them.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
