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Home›Cummins/Onan›Cummins/Onan DQHAB

Cummins/Onan DQHAB Generator Set

The Cummins/Onan DQHAB is a 300 kW (375 kVA) Diesel standby generator set powered by a Cummins/Onan QSM11G4 engine. It is available at 120/208 V, 127/220 V, 139/240 V, 220/380 V, 240/416 V, 254/440 V, 277/480 V and 347/600 V, 3-phase, 60 Hz and rated 1042 A. It holds about 36.72 L (9.7 gal) of oil and 33.7 L (8.9 gal) of coolant, with a maximum ambient rating of 52 °C. Starting uses 2 group-12 batteries rated 1400 CCA at 24 V. The set measures 1524×600×710 mm (60.0×23.6×28.0 in), weighs about 2676 kg (5900 lb) and produces Not specified dBA at Not specified m. An integrated tank holds Not specified L (None gal), roughly Not specified hours of runtime. The same QSM11G4 engine also powers generator sets from Terex.

300 kW
Standby
10.8 L
Displacement
36.72 L
Oil capacity
3
Document types

How to read your Cummins/Onan serial & model number →

Typical fuel consumption for 300–305 kW Diesel generators →

Compare with other 300–305 kW Diesel generators →

On this pageSpecsEngineMaintenanceFuel consumptionDocumentsFAQSame engine

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power300 kW
Standby kVA375
Prime power270 kW
EmissionsEPA NSPS Stationary Emergency Tier 3
ControllerPCC2100, PowerCommand, PowerCommand 2100
Oil capacity36.72 L
AlternatorNot specified
Voltage options120/208 V, 127/220 V, 139/240 V, 220/380 V, 240/416 V, 254/440 V, 277/480 V, 347/600 V
PhaseThree phase
Rated current1042 A
Power factor0.8
Circuit breaker1042 A
Battery group12
Battery cranking1400 CCA
Battery voltage24 V
Battery quantity2
Coolant capacity33.7 L
Max ambient52 °C
Dimensions (L×W×H)1524×600×710 mm
Dry weight2676 kg
Wet weight2762 kg
Tank runtimeNot specified hr

Engine

Cummins/Onan QSM11G4
Oil capacity36.72 L
Coolant capacity33.7 L
Displacement10.8 L
AspirationTurbocharged, EGR and CAC
Rated speed1800 rpm

Same engine, other brands

1 brand

The Cummins/Onan QSM11G4 in this set also powers 1 generator set sold under 1 other brand. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.

BrandModels
TerexT360 Super Quiet Generator

Maintenance & consumables

for the Cummins/Onan QSM11G4
ItemSpecCapacityPart #Interval
Air filterClean/replace engine air cleaner element; Inspect/clean engine ground—1000 hr
Fuel filterDrain fuel system primary filter/water separator—500 hr
Oil filterInspect, adjust or replace alternator or fan belt; Change cooling system coolant (ELC); Replace water separator element; Replace fuel system secondary filter; Inspect/adjust engine valve lash; Inspect aftercooler core; Inspect alternator; Inspect engine mounts; Inspect starting motor; Inspect turbocharger; Inspect water pump—2000 hr
BatteryCheck battery electrolyte level—500 hr
BeltInspect, adjust or replace alternator or fan belt; Inspect/adjust engine valve lash; Inspect aftercooler core; Inspect alternator; Inspect engine mounts; Inspect starting motor; Inspect turbocharger; Inspect water pump—2000 hr
CoolantCheck cooling system coolant level; Check driven equipment; Inspect engine air cleaner service indicator; Check engine oil level; Drain tank water and sediment; Check battery electrolyte level; Clean/test aftercooler core; Add cooling system coolant extender (ELC); Change cooling system coolant (ELC)—50 hr
Coolant filter—
OilChange engine oil and filter—12000 hr
Spark plugInspect, adjust or replace alternator or fan belt; Inspect/adjust engine valve lash; Inspect aftercooler core; Inspect alternator; Inspect engine mounts; Inspect starting motor; Inspect turbocharger; Inspect water pump—2000 hr

Common questions

What is the power rating of the Cummins/Onan DQHAB?

The Cummins/Onan DQHAB is rated 300 kW standby (375.0 kVA).

What engine is in the Cummins/Onan DQHAB?

The Cummins/Onan DQHAB is powered by the Cummins/Onan QSM11G4 engine.

Is the Cummins/Onan DQHAB diesel or gas?

The Cummins/Onan DQHAB runs on Diesel.

How much oil does the Cummins/Onan DQHAB take?

The Cummins/Onan QSM11G4 engine in the Cummins/Onan DQHAB has an oil capacity of 36.72 liters.

How much coolant does the Cummins/Onan DQHAB hold?

The Cummins/Onan DQHAB cooling system holds 33.7 liters (8.9 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the prime power rating of the Cummins/Onan DQHAB?

The Cummins/Onan DQHAB is rated 270 kW prime (338 kVA), against 300 kW standby.

What is the dry weight of the Cummins/Onan DQHAB?

The Cummins/Onan DQHAB has a dry weight of 2676 kg (5899 lb).

What voltages is the Cummins/Onan DQHAB available in?

The Cummins/Onan DQHAB is offered in 120/208 V, 127/220 V, 139/240 V, 220/380 V, 240/416 V, 254/440 V, Three phase-phase.

What size battery does the Cummins/Onan DQHAB need?

The Cummins/Onan DQHAB uses 2 batteryies, 24 V each, 1400 CCA, group 12, per the manufacturer specification sheet.

What alternator does the Cummins/Onan DQHAB use?

The Cummins/Onan DQHAB uses a Not specified alternator.

Troubleshooting

6

Fault codes

CodeMeaning
121Speed Signal Lost
135Oil Pressure Sensor High
141Oil Pressure Sensor Low

Symptoms & remedies

SymptomCauseRemedy
Generator does not startFault Code 101 - Starter Motor FaultCheck starter motor connections and replace if necessary
Engine runs roughFault Code 203 - Fuel System FaultInspect fuel filter and injectors, clean or replace as needed
Generator produces low voltage outputFault Code 304 - Alternator Winding FaultCheck alternator windings for damage and repair or replace if necessary

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan DQHAB troubleshooting guide (56 entries) →

Parts

12
Part #DescriptionQtySystem
A035N852Hose, Drain - Bulk (Order by the Foot - 1 Feet Required)-1Hose Amazon eBay
ES100006Overcurrent Relay WiringOvercurrent relay wiring Amazon eBay
ES100026Three Position Stack Switch WiringStack switch wiring Amazon eBay
ES100027Distribution Panel Wiring for T360 Series Single Phase ControlDistribution panel wiring Amazon eBay
ES100030Standard Generator Wiring for T360 SeriesGenerator wiring Amazon eBay
ES100039Idle-Run Wiring (Cummins)Idle run wiring Amazon eBay
134890T360 Super Quiet GeneratorService part / kit Amazon eBay
961-0514InPower Service Tool Kit1Service part / kit Amazon eBay
961-0619Generator Set Support4Service part / kit Amazon eBay
A045Z906Isolator, Vibration1Service part / kit Amazon eBay
A045Z908Bracket, Switch1Service part / kit Amazon eBay
E204747Coolant heater 240/480V 6420W 1PHService part / kit eBay $1948.00

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Prime331.7287.63
Prime25%23.776.28
Prime50%40.3510.66
Prime75%58.7115.51
Prime100%78.2120.66
Standby312.5282.56
Standby25%25.256.67
Standby50%43.811.57
Standby75%64.8117.12
Standby100%87.6323.15

Available documents

Spec sheet — Cummins-300-DQHAB (Cummins/Onan)Spec sheet — Cummins-DQHAB-data-sheet (Cummins/Onan)Spec sheet — s-1586 (Cummins/Onan)Parts manual — 0961-0217 I10 201810 (Cummins/Onan)Service manual — Cummins-DQHAA-DQHAB-installation-manual (Cummins/Onan)Service manual — Cummins-PowerCommand-2100-controller-operator-manual (Cummins/Onan)Service manual — DQHA A-B with QSM11 Engine PCC2100 Service Manual (Cummins/Onan)

This page was generated from the 7 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.