The Doosan G325 delivers 260 kW of prime power (325 kVA) from a Cummins QSL9-G8 8.9-liter engine, stepping into the large portable class at 14,000 lbs. The 480-gallon integral fuel tank and 1,000A main breaker support sustained high-demand construction and temporary power operations.
At this power class, the Doosan G325 competes directly with Atlas Copco QAS 330 and MQ Power DCA-300 — typically pricing 15-30% below both while using the same Cummins engine platform that rental fleet service departments know well.
Cummins QSL9 engine and large-frame serviceability#
The G325 steps up to the Cummins QSL9, an 8.9-liter inline-6 that is one of the most widely deployed large-displacement diesels in the portable power industry. The QSL9 is used across multiple generator brands at the 250-350 kVA class, which means service technicians are familiar with the platform and parts availability is excellent.
The 1,000A main breaker supports high-amperage loads common on large commercial construction sites — tower cranes, concrete batch plants, and large temporary HVAC systems. The 480-gallon integral fuel tank provides enough capacity for sustained multi-day operations without frequent refueling.
OnPoint services Cummins QSL9-powered generators across multiple brands in Northern California. The QSL9 is a proven workhorse at this power level — robust, well-supported by Cummins distributors, and straightforward to service. The G325's enclosure provides adequate service access for the larger engine, and the 500-hour oil change interval keeps maintenance predictable. For fleet operators at the 300+ kVA class, the G325's Cummins standardization means the same filters, fluids, and procedures used on other QSL9-powered units in the fleet.
Engineering specifications
Physical
Length
233 in
Width
83 in
Height
113 in
Wet weight
14,032 lb
Acoustic
Sound @ 7m, full load
76 dBA
Enclosure
Sound-attenuated
Fuel system & runtime
Integral fuel tank
480 gal
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Get pricing & lead time on the Doosan G325
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
30.7 hours(1.3 days)
Fuel consumption ≈ 15.66 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 Doosan G325 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 flow, hard starting, power loss under load
500+
minor
Battery
Failed to start or slow cranking after extended storage
4,380+
minor
Coolant hoses
Weeping at clamp connections, slow coolant loss
5,000+
minor
DPF regeneration
Incomplete regen at sustained light loads, power derate warning
2,000+
moderate
Frequently Asked Questions
What is the standby power rating of the Doosan G325?
The Doosan G325 delivers 290 kW standby and 267 kW prime power. It is powered by the Cummins QSL9 8.9-liter engine and features a 1,000A main breaker for high-amperage load applications. Also sold as the Bobcat PG325.
What engine does the Doosan G325 use?
The G325 is powered by a Cummins QSL9-G9 8.9-liter inline-6 turbocharged diesel engine running at 1,800 RPM. The QSL9 is one of the most widely deployed large-displacement diesels in the portable power industry, ensuring wide parts availability and familiar serviceability across multiple brands.
What are the service intervals for the Doosan G325?
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. DPF aftertreatment requires periodic inspection and cleaning at manufacturer-specified intervals.
Is the Doosan G325 EPA compliant?
Yes. The G325 is EPA Tier 4 Final compliant. The Cummins QSL9-G9 meets current U.S. emissions requirements. The G325 includes a DPF in its aftertreatment system — maintain adequate load above 30% to support proper DPF regeneration cycles.
How does Doosan compare to Atlas Copco at the 325 kVA class?
Both operate in the 300-330 kVA class with similar engine classes. The G325 typically prices 15-30% below Atlas Copco's QAS 330. The G325's 480-gallon integral tank provides competitive runtime for sustained operations. The QAS 330 uses John Deere power; the G325 uses the Cummins QSL9.
What control panel does the Doosan G325 use?
The G325 is equipped with Doosan's digital control panel providing auto-start, fault monitoring, voltage/frequency display, runtime tracking, and DPF aftertreatment status. The 1,000A main breaker is accessible through the enclosure for load connection on large commercial sites.
Who services Doosan generators in Northern California?
OnPoint Generators services Cummins QSL9-powered generators across multiple brands in Northern California. The QSL9 is a proven workhorse with excellent parts availability through Bay Area Cummins distributors and straightforward serviceability.
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