The Atlas Copco QAS 150 delivers 120 kW of prime power from a John Deere 6068HFG05 inline-six diesel engine with 6.8 liters of displacement. The massive 335-gallon integral fuel tank provides over 43 hours of runtime at 75% load — one of the longest runtimes in the 150 kVA class.
At 70 dBA at 7 meters, the QAS 150 is notably quieter than its 100 kW sibling (QAS 125 at 73 dBA) despite the larger engine, reflecting Atlas Copco's investment in sound attenuation engineering. The unit features dual-frequency capability (50/60 Hz) and a 25-gallon DEF tank for Tier 4 Final aftertreatment.
The QAS 150 steps up to the John Deere 6068HFG05 — a 6.8-liter inline-six that is one of the most widely used industrial diesel engines in the generator industry. This platform is shared with the QAS 200, which uses the same engine block paired with a larger alternator. For fleet operators, this parts commonality between the 150 and 200 models reduces inventory complexity.
The Leroy Somer LSA 44.3 M6 alternator with AREP excitation delivers ±0.25% voltage regulation — the consistent hallmark of the QAS series. The 335-gallon fuel tank and 25-gallon DEF tank are sized for extended unattended operation, and 500-hour service intervals keep maintenance costs predictable.
The QAS 150 is one of the best-balanced models in the Atlas Copco portable lineup. The combination of 120 kW output, 70 dBA sound level, and 43+ hour runtime makes it a strong choice for extended construction and temporary power deployments. The John Deere 6068 engine platform has excellent aftermarket support through John Deere's dealer network, which partially compensates for Atlas Copco's weak after-sale service.
Atlas Copco's own service network remains the brand's most significant drawback. Owners regularly report unreturned service calls, travel charges exceeding $311/hour, and multi-week waits for enclosure-specific parts. For QAS 150 owners in Northern California, OnPoint provides local maintenance and repair service — we are experienced with the John Deere 6068 platform across multiple generator brands and can service both engine and genset-level components.
Engineering specifications
Acoustic
Sound @ 7m, 75% load
70 dBA
Enclosure
Sound-attenuated
Fuel system & runtime
Integral fuel tank
335 gal
DEF tank
25 gal
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Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.
Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Estimated runtime
47.0 hours(2.0 days)
Fuel consumption ≈ 7.13 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 150 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.
Component
Symptom
Typical hours
Severity
Fuel filter
Restricted fuel flow, hard starting, power loss
500+
minor
Starting battery
Failed start or slow cranking after extended storage
4,380+
minor
Coolant hoses
Weeping at clamp joints, low coolant warning
5,000+
minor
Frequently Asked Questions
What is the prime and standby rating of the Atlas Copco QAS 150?
The QAS 150 delivers 120 kW prime power and 132 kW standby power. It is the first model in the QAS lineup to use the John Deere 6068 inline-6 platform, which is shared with the larger QAS 200.
What engine does the Atlas Copco QAS 150 use?
The QAS 150 is powered by a John Deere 6068HFG05 6.8-liter inline-6 turbocharged-aftercooled diesel engine running at 1,800 RPM. The 6068 platform is one of the most widely used engines in the portable generator industry and is shared with the QAS 200.
What are the service intervals for the QAS 150?
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. DEF level monitoring is required for Tier 4 Final SCR compliance — the unit includes a 25-gallon DEF tank.
Is the Atlas Copco QAS 150 EPA Tier 4 Final compliant?
Yes. The QAS 150 is EPA Tier 4 Final and CARB compliant, legal for operation throughout California. The John Deere 6068HFG05 uses DOC and SCR aftertreatment with the 25-gallon DEF tank integrated into the unit.
How does the QAS 150 differ from the QAS 200?
Both the QAS 150 and QAS 200 use the same John Deere 6068HFG05 engine and share the same 335-gallon fuel tank and 25-gallon DEF tank. The QAS 200 extracts 160 kW prime (vs. 120 kW) through a larger Leroy Somer LSA 44.3 VL 13 alternator vs. the QAS 150's LSA 44.3 M6. Both operate at similar noise levels (70 vs. 71 dBA).
What fuel does the Atlas Copco QAS 150 use?
The QAS 150 runs on diesel with DEF required for SCR aftertreatment. The 335-gallon integral tank provides over 43 hours of runtime at 75% load. The 25-gallon DEF tank is sized for the same runtime window.
Who services Atlas Copco generators in Northern California?
OnPoint Generators provides local service and maintenance for Atlas Copco QAS units including the John Deere 6068-powered models. We serve the Bay Area and Northern California with faster response times than the Atlas Copco factory service network.
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