Atlas Copco · QAS Series

Atlas Copco QAS 235

206 kW standby / 187 kW prime · Diesel · Liquid-cooled

234 kVA (187 kW prime) portable diesel generator. Swedish-engineered QAS series with FPT engine.

Atlas Copco Atlas Copco QAS 235 generator — specifications and details
Standby power
206 kW / 187 kW prime
Voltage options
277/480V
Frequency / Phase
60 Hz · 3-phase
Engine
FPT N67TEVP01 · 6.7L
EPA / Emissions
Tier 4 Final
Alternator
Leroy Somer TAL 044M
Commercialrental-fleettemporary-power
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Overview#

The Atlas Copco QAS 235 FD is a 234 kVA portable diesel generator powered by an FPT N67TEVP01 6.7L inline-6 engine. Delivering 187 kW prime / 206 kW standby, it is the larger of two FPT-powered units in the QAS range. The sound-attenuated enclosure keeps noise to 69 dBA at 7 meters at 75% load — 5-8 dB quieter than most competitors near the 200 kW portable class. EPA Tier 4 Final and CARB compliant, it is legal for operation throughout California without restriction.

Technical highlights#

The QAS 235 extracts more power from the same FPT N67TEVP01 platform used in the smaller QAS 175, paired here with a higher-frame Leroy Somer TAL 044M alternator featuring Class H insulation and voltage regulation within ±0.25%. The turbocharged-aftercooled engine runs at 1800 RPM with fuel consumption of 9.1 gph at 75% load. With a 194-gallon integral diesel tank and an 11-gallon DEF tank, the unit delivers roughly 21 hours of continuous runtime at typical job-site loads. Three-phase 277/480V output at 60 Hz serves large commercial electrical loads directly, and the QAS 235's compact footprint relative to its output makes it a popular choice for space-constrained sites.

Our service experience#

Atlas Copco's Swedish engineering is evident in the QAS 235's quiet operation and fuel efficiency — extracting 187 kW from the same 6.7L FPT block that powers the QAS 175 at 140 kW is a testament to the platform's headroom. Where Atlas Copco falls short in Northern California is after-sale service: unreturned calls, $311+/hr travel charges, and parts delays are the most common complaints from fleet operators and rental houses. OnPoint provides a local Bay Area and NorCal service alternative — responsive scheduling, transparent pricing, and technicians who know FPT engines and Leroy Somer alternators. If you own or rent QAS units in Northern California, we are here to keep them running.

Engineering specifications

Acoustic

Sound @ 7m, 75% load
69 dBA
Enclosure
Sound-attenuated

Fuel system & runtime

Integral fuel tank
194 gal
Fuel use @ 75% load
9.1 GPH
DEF tank
11 gal

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Estimate runtime for the Atlas Copco QAS 235

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

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Estimated runtime

17.4 hours(0.7 days)

Fuel consumption ≈ 11.12 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Atlas Copco QAS 235 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 500 hours or 12 months
Air filter
Every 500 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 hours

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
Fuel filterRestricted fuel flow, reduced power, hard starting500+minor
BatteryFailed to start, slow crank, low voltage warning4,380+minor
Coolant hoseWeeping coolant at hose connections, low coolant alarm5,000+minor

Frequently Asked Questions

What is the prime and standby rating of the Atlas Copco QAS 235?
The QAS 235 delivers 187 kW prime power and 206 kW standby power. It is the larger of two FPT-powered models in the QAS lineup and the most powerful QAS model before transitioning to John Deere 6090 and Scania engines.
What engine does the Atlas Copco QAS 235 use?
The QAS 235 is powered by an FPT N67TEVP01 6.7-liter inline-6 turbocharged-aftercooled diesel engine running at 1,800 RPM — the same engine block as the QAS 175 but tuned for higher output. The N67TEVP01 is an industrial platform widely used in construction and power generation.
What are the service intervals for the QAS 235?
Oil changes are due every 500 hours or 12 months, whichever comes first. Air filter and fuel filter replacement intervals are 500 hours. Major engine overhaul is specified at 20,000 hours. The 11-gallon DEF tank requires periodic refill for Tier 4 Final SCR compliance.
Is the Atlas Copco QAS 235 EPA Tier 4 Final compliant?
Yes. The QAS 235 is EPA Tier 4 Final and CARB compliant, legal for operation throughout California. The FPT N67TEVP01 uses SCR aftertreatment with an 11-gallon DEF tank integrated into the unit.
How does the QAS 235 compare to the QAS 250?
The QAS 250 steps up to the John Deere 6090HFG06 9.0-liter engine delivering 200 kW prime vs. the QAS 235's 187 kW. The QAS 250 also adds a significantly larger 385-gallon fuel tank (vs. 194 gallons) and 1-phase voltage options. The QAS 235 operates at 69 dBA vs. 73 dBA for the QAS 250.
What fuel does the Atlas Copco QAS 235 use?
The QAS 235 runs on diesel with DEF required for SCR aftertreatment. The 194-gallon integral diesel tank provides approximately 21 hours of runtime at 75% load (9.1 gal/hr). An 11-gallon DEF tank is integrated into the unit.
Who services Atlas Copco generators in Northern California?
OnPoint Generators provides local service and maintenance for Atlas Copco QAS units including the FPT N67-powered models across the Bay Area and Northern California. Our technicians are experienced with both FPT engines and Leroy Somer alternators.

More in the QAS Series

Atlas Copco's portable diesel workhorse — 22 to 616 kW, Tier 4 Final, Leroy Somer alternators, 5–8 dB quieter than the competition.

View all 14models in this series →

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