Atlas Copco · QAS Series

Atlas Copco QAS 175

154 kW standby / 140 kW prime · Diesel · Liquid-cooled

175 kVA (140 kW prime) portable diesel generator. Swedish-engineered QAS series with FPT engine.

Atlas Copco Atlas Copco QAS 175 generator — specifications and details
Standby power
154 kW / 140 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 044J
Commercialrental-fleettemporary-power
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Overview#

The Atlas Copco QAS 175 FD is a 175 kVA portable diesel generator powered by an FPT (Fiat Powertrain) N67TEVP01 6.7L inline-6 engine. Delivering 140 kW prime / 154 kW standby, it is one 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 in the 125-175 kW portable class. EPA Tier 4 Final and CARB compliant, it is legal for operation throughout California without restriction.

Technical highlights#

The QAS 175 pairs the FPT N67 platform — widely used across construction and marine applications — with a Leroy Somer TAL 044J alternator featuring Class H insulation and voltage regulation within ±0.25%. The engine runs at 1800 RPM and delivers strong fuel economy at 7 gph at 75% load. With a 194-gallon integral diesel tank and an 11-gallon DEF tank, the unit offers roughly 27-28 hours of continuous runtime at typical job-site loads. Three-phase 277/480V output at 60 Hz serves most commercial electrical panels directly, making the QAS 175 a versatile mid-range workhorse for rental fleets and temporary power applications.

Our service experience#

Atlas Copco's Swedish engineering is evident in the QAS 175's quiet operation, compact footprint, and fuel efficiency. The FPT N67 engine is a reliable platform with broad parts availability. 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 we hear 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
7 GPH
DEF tank
11 gal

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Estimate runtime for the Atlas Copco QAS 175

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

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Estimated runtime

23.3 hours(1.0 days)

Fuel consumption ≈ 8.32 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 175 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 175?
The QAS 175 delivers 140 kW prime power and 154 kW standby power. It is one of two FPT-powered models in the QAS lineup and outputs three-phase 277/480V at 60 Hz.
What engine does the Atlas Copco QAS 175 use?
The QAS 175 is powered by an FPT N67TEVP01 6.7-liter inline-6 diesel engine running at 1,800 RPM. FPT (Fiat Powertrain Technologies) is a proven industrial engine platform widely used in construction and marine applications. The same N67 engine is used in the larger QAS 235.
What are the service intervals for the QAS 175?
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 unit includes an 11-gallon DEF tank for SCR aftertreatment requiring periodic refill.
Is the Atlas Copco QAS 175 EPA Tier 4 Final compliant?
Yes. The QAS 175 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 175 differ from the QAS 235?
Both the QAS 175 and QAS 235 use the same FPT N67TEVP01 engine and 194-gallon fuel tank. The QAS 235 extracts 187 kW prime (vs. 140 kW) through a larger Leroy Somer TAL 044M alternator vs. the QAS 175's TAL 044J. Both operate at 69 dBA.
What fuel does the Atlas Copco QAS 175 use?
The QAS 175 runs on diesel with DEF required for SCR aftertreatment. The 194-gallon integral diesel tank provides approximately 27-28 hours of runtime at 75% load (7 gal/hr). An 11-gallon DEF tank is integrated into the unit.
Who services Atlas Copco generators in Northern California?
PowerGen provides local service and maintenance for Atlas Copco QAS units including the FPT-powered models across the Bay Area and Northern California. We offer responsive scheduling and faster response times than the Atlas Copco factory service network.

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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