What is the standby power rating of the Doosan G40?

The Doosan G40 delivers 34 kW standby and 31 kW prime power. It uses the Doosan D24 2.4-liter inline-4 engine and is also sold as the Bobcat PG40.

What engine does the Doosan G40 use?

The G40 is powered by a Doosan D24 2.4-liter inline-4 naturally aspirated diesel engine running at 1,800 RPM. Like the D18, the D24 achieves EPA Tier 4 Final compliance through DOC-only aftertreatment with no DPF and no DEF required.

What are the service intervals for the Doosan G40?

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 under normal operating conditions.

Is the Doosan G40 EPA compliant?

Yes. The G40 is EPA Tier 4 Final compliant. The D24 engine meets current emissions requirements through DOC aftertreatment without requiring a DPF, SCR, or DEF — the simplest Tier 4 compliance path available.

How does Doosan compare to CAT at the 40 kVA class?

Both deliver comparable power at 64 dBA noise levels. The G40 typically prices 15-30% below CAT portable units at the 40 kVA class. The D24 engine is a Doosan proprietary platform — parts are available through Doosan/Bobcat dealers, and the engine's naturally aspirated design reduces the number of failure points vs. turbocharged competitors.

What control panel does the Doosan G40 use?

The G40 uses Doosan's integrated digital control panel with auto-start, fault monitoring, and runtime tracking, housed within the CoolBox enclosure for weather protection. The panel provides access to voltage, frequency, and load monitoring for jobsite diagnostics.

Who services Doosan generators in Northern California?

OnPoint Generators services Doosan G-Series portable generators across the Bay Area and Northern California. The D24 engine shares maintenance procedures and parts with the G50, so fleet operators running both models benefit from a single service visit.

Doosan / Bobcat · G-Series

Doosan G40

Name: Doosan G40
Brand: Doosan / Bobcat
Availability: PreOrder

34 kW standby / 31 kW prime · Diesel · Liquid-cooled

30 kW standby diesel portable generator. Doosan D24-powered with 64 dBA operation, CoolBox enclosure, and 110-gallon tank.

Standby power: 34 kW / 31 kW prime
Voltage options: 120/240V, 208V, 480V
Frequency / Phase: 60 Hz · 1/3-phase
Engine: Doosan D24 · 2.4L
EPA / Emissions: Tier 4 Final

Commercialrental-fleettemporary-power

Configure & Quote

Overview#

The Doosan G40 delivers 31 kW of prime power (39 kVA) from a Doosan D24 diesel engine enclosed in the CoolBox acoustically-treated enclosure. At 64 dBA, the G40 matches MQ Power WhisperWatt-class noise levels at a significantly lower price point — typically 15-30% less than comparable CAT portable units.

The 110-gallon integrated fuel tank provides at least 24 hours of runtime at full load. Environmental containment is built into the skid baseframe. The unit is now also sold as the Bobcat PG40 — same internals, different badge.

CoolBox enclosure and Doosan D24 engine#

The D24 is a 2.4-liter naturally aspirated inline-4 diesel — Doosan's mid-range proprietary engine for portable power. Like the smaller D18, it achieves Tier 4 Final compliance through DOC aftertreatment without requiring a DPF, which eliminates regeneration concerns and simplifies maintenance.

The CoolBox enclosure on the G40 integrates sound attenuation, environmental containment, and the 110-gallon fuel tank into a single skid-mounted package. At 64 dBA at 7 meters under full load, the G40 meets noise restrictions on urban construction sites and residential-adjacent projects without supplemental sound barriers.

Our service experience#

OnPoint services Doosan G40 units across Northern California rental fleets. The D24 engine shares the same maintenance simplicity as the smaller D18 — no turbo, no DPF, 250-hour oil change intervals. The 110-gallon tank is a genuine advantage for rental operators who want to minimize fuel truck dispatches on multi-day jobs. Fuel filter replacement at 500-hour intervals is the most common service item. Parts availability through Bobcat dealer networks in the Bay Area is reliable, and the CoolBox enclosure panels are straightforward to remove for engine access.

Engineering specifications

Physical

Length: 130.5 in
Width: 73 in
Height: 78.5 in
Wet weight: 3,870 lb

Acoustic

Sound @ 7m, full load: 64 dBA
Enclosure: Sound-attenuated

Fuel system & runtime

Integral fuel tank: 110 gal

Ready to order this model?

Configure your Doosan G40

Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.

Configure & Quote →Just request a quote

Estimate runtime for the Doosan G40

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

Estimate runtime on this tank

Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

59.9 hours(2.5 days)

Fuel consumption ≈ 1.84 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 G40 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 G40?: The Doosan G40 delivers 34 kW standby and 31 kW prime power. It uses the Doosan D24 2.4-liter inline-4 engine and is also sold as the Bobcat PG40.
What engine does the Doosan G40 use?: The G40 is powered by a Doosan D24 2.4-liter inline-4 naturally aspirated diesel engine running at 1,800 RPM. Like the D18, the D24 achieves EPA Tier 4 Final compliance through DOC-only aftertreatment with no DPF and no DEF required.
What are the service intervals for the Doosan G40?: 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 under normal operating conditions.
Is the Doosan G40 EPA compliant?: Yes. The G40 is EPA Tier 4 Final compliant. The D24 engine meets current emissions requirements through DOC aftertreatment without requiring a DPF, SCR, or DEF — the simplest Tier 4 compliance path available.
How does Doosan compare to CAT at the 40 kVA class?: Both deliver comparable power at 64 dBA noise levels. The G40 typically prices 15-30% below CAT portable units at the 40 kVA class. The D24 engine is a Doosan proprietary platform — parts are available through Doosan/Bobcat dealers, and the engine's naturally aspirated design reduces the number of failure points vs. turbocharged competitors.
What control panel does the Doosan G40 use?: The G40 uses Doosan's integrated digital control panel with auto-start, fault monitoring, and runtime tracking, housed within the CoolBox enclosure for weather protection. The panel provides access to voltage, frequency, and load monitoring for jobsite diagnostics.
Who services Doosan generators in Northern California?: OnPoint Generators services Doosan G-Series portable generators across the Bay Area and Northern California. The D24 engine shares maintenance procedures and parts with the G50, so fleet operators running both models benefit from a single service visit.

More in the G-Series

Cummins and Doosan engines in a purpose-built portable enclosure — 22 to 500 kW at a competitive price.

View all 13models in this series →

Similar models

Doosan / Bobcat

Doosan G25

Rental-grade CoolBox enclosure at 15-30% below MQ Power/Airman pricing. Doosan D18 engine is simple and reliable with low maintenance costs.

22 kW standby · Diesel · Liquid-cooled

Small construction sites, single-trade contractors, residential renovation backup, and rental fleet entry-level units.

20 kW prime diesel portable generator. Doosan D18-powered with 63 dBA operation and 25-hour runtime at full load.

Tier 4 Final3-phaseconstructionrental-fleet

Doosan / Bobcat

Doosan G50

37-hour runtime on 110-gallon tank — longest in the 50 kVA portable class. Same D24 engine and chassis as G40, giving fleet operators parts commonality.

42 kW standby · Diesel · Liquid-cooled

Multi-day construction sites needing more than 30 kW, commercial temporary power, rental fleet mid-range units, and dual-frequency international projects.

38 kW prime diesel portable generator. Doosan D24-powered with 64 dBA operation, 110-gallon tank, and 37.2-hour runtime.

Tier 4 Final3-phaseconstructionrental-fleet

Airman

Airman SDG40

0.001% warranty claim rate, 110% fluid containment standard, 37-hr runtime in the same footprint as the SDG25 — maximum power density with lowest total cost of ownership.

30 kW standby · Diesel · Liquid-cooled

Mid-range 29 kW portable for construction sites needing more power without a larger footprint. Ideal for commercial TI projects, utility work, and multi-day unattended temporary power.

28.6 kW prime diesel portable generator. Kubota-powered with 37-hour runtime at full load and 110% fluid containment standard.

Tier 4 Final3-phaseconstructionrental-fleet

Need service or parts for the Doosan G40?

We service every major OEM and stock genuine parts for the most common models.

Get A Quote Or call (831) 375-1463