The Doosan G70 delivers 56 kW of prime power (70 kVA) from a Doosan D34 3.4-liter engine — the largest of Doosan's proprietary diesel engines used in the G-Series lineup. At 64 dBA, Doosan positions this as the quietest mid-range Tier 4 Final package on the market.
The redesigned enclosure features dual-frequency switching (50/60 Hz) as standard, and the Marelli alternator provides stable voltage regulation with strong motor starting capability. DOC and SCR aftertreatment (with 5.1-gallon DEF tank) meet Tier 4 Final emissions. Also sold as the Bobcat PG70.
The G70 is the largest model in the Doosan lineup powered by a Doosan proprietary engine — the D34, a 3.4-liter turbocharged inline-4. Above this power level, Doosan transitions to Cummins engines starting with the G100. The D34's turbocharger delivers the additional airflow needed for 56 kW output while maintaining the same 64 dBA noise level as the smaller naturally aspirated D24-powered models.
Unlike the smaller G25/G40/G50 which use DOC-only aftertreatment, the G70's D34 adds SCR (selective catalytic reduction) with a 5.1-gallon DEF tank. There is still no DPF, which means no regeneration cycles and no risk of DPF-related derates — a meaningful maintenance advantage over competitors that require DPF-equipped engines at this power level.
OnPoint services Doosan G70 units across Northern California. The D34 turbocharged engine is the most powerful of Doosan's proprietary diesels, and the turbocharger adds one maintenance item compared to the naturally aspirated D18/D24 models. DEF consumption is modest — the 5.1-gallon tank lasts well beyond a typical fuel fill cycle. Oil changes remain at 250-hour intervals. The Marelli alternator is robust and parts are available through electrical supply distributors. For fleet operators stepping up from the G50, the G70 moves to a larger chassis footprint but maintains the same CoolBox enclosure serviceability.
Engineering specifications
Physical
Length
163.8 in
Width
71.3 in
Height
93.3 in
Wet weight
5,550 lb
Acoustic
Sound @ 7m, full load
64 dBA
Enclosure
Sound-attenuated
Fuel system & runtime
Integral fuel tank
110 gal
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Get pricing & lead time on the Doosan G70
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
34.0 hours(1.4 days)
Fuel consumption ≈ 3.24 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 G70 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 250 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
Frequently Asked Questions
What is the standby power rating of the Doosan G70?
The Doosan G70 delivers 60 kW standby and 56 kW prime power. It is the largest Doosan-proprietary engine model in the G-Series — above this, the lineup transitions to Cummins engines. Also sold as the Bobcat PG70.
What engine does the Doosan G70 use?
The G70 is powered by a Doosan D34 3.4-liter inline-4 turbocharged diesel engine running at 1,800 RPM. The D34 uses DOC and SCR aftertreatment with a 5.1-gallon DEF tank for EPA Tier 4 Final compliance — no DPF required.
What are the service intervals for the Doosan G70?
Oil changes are due every 250 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 5.1-gallon DEF tank requires periodic refill for SCR aftertreatment compliance.
Is the Doosan G70 EPA compliant?
Yes. The G70 is EPA Tier 4 Final compliant. The D34 achieves compliance through DOC and SCR aftertreatment — no diesel particulate filter (DPF) is required, eliminating regeneration cycles and associated maintenance complications.
How does Doosan compare to CAT at the 70 kVA class?
Both operate at comparable noise levels in the 70 kVA class. The G70's 64 dBA at full load is competitive with CAT portable units in this range. Doosan typically prices 15-30% below CAT. The G70's no-DPF aftertreatment is a maintenance advantage over competitors that require DPF management at this power level.
What control panel does the Doosan G70 use?
The G70 is equipped with Doosan's digital control panel providing auto-start, manual start, fault monitoring, voltage/frequency display, and runtime tracking. DEF level monitoring is integrated to alert operators before SCR system derates.
Who services Doosan generators in Northern California?
OnPoint Generators services Doosan G-Series portable generators including the D34-powered G70 across the Bay Area and Northern California. We stock common consumables and DEF for rapid service response on Doosan units.
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