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Cummins/Onan QSM11G4 Engine

The Cummins/Onan QSM11G4 is a 10.8 L 6-cylinder turbocharged, egr and cac engine rated at 1800 rpm, producing up to 350 kW. It powers generator sets from Cummins/Onan and Terex, including the DQHAA, DQHAB, DQHAB-6515690 and DQHAB-7229336. It holds 36.72 L (38.8 US qt) of oil and 33.7 L (8.9 gal) of coolant.

Also known as: CUMMINS QSM11G4

Part of the Cummins/Onan QSM11 engine family — 18 variants share parts & fitment.

10.8 L

Displacement

Cylinders

1800 rpm

Rated speed

350 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Procedures

Engine specifications

Oil capacity	36.7 L (38.8 US qt)
Coolant capacity	33.7 L
Displacement	10.8 L
Cylinders	6
Aspiration	Turbocharged, EGR and CAC
Rated speed	1800 rpm
Gross power	350 kW

Generator sets powered by this engine

Shared across brands: Cummins/Onan, Terex

Cummins/Onan DQHAACummins/Onan DQHABCummins/Onan DQHAB-6515690Cummins/Onan DQHAB-7229336Terex T360 Super Quiet Generator

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

Common problems

LOW BAT VOLTAGE — Warning 441
Cause: Battery voltage supply to the control is approaching a low level at which unpredictable operation will occur; discharged or defective battery
Fix: Check the battery charger fuse. Recharge or replace the battery
Overspeed — Shtdn 234
LOW COOLANT TEMP — Warning 1435
Cause: Engine coolant heater is not operating or is not circulating coolant; coolant heater not connected to power supply
Fix: Check for blown fuse or disconnected heater cord and correct as required
J1939 time out error — Wrng 285
Engine turns over (cranks), but won't run
Cause: Unit out of fuel
Fix: Check fuel level in tank, fill as needed
Engine shuts down automatically and TROUBLE LIGHT on CONTROL PANEL is illuminated
Cause: Oil Pressure Switch Not opening
WEAK BATTERY — Warning 1442
Cause: During cranking, the battery voltage is at or below the weak battery warning trip point for a time greater than or equal to the weak battery set time
Fix: See code 441 for corrective action
Water in fuel high — Wrng 1852
VGT comm timeout — Wrng 1894
Under Frequency — Shtdn 1448
Unack fault warn — Wrng 2962
TRB in temp sen low — Wrng 692
TRB in temp sen high — Wrng 691
TOO LONG IN IDLE — Warning 2342
Cause: Genset has been in Idle mode too long (10 minutes maximum)
Speed/Hz Match — Shtdn 1469

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSM11G4.

Maintenance schedule

Item	Spec	Part #	Interval
Air filter	Clean/replace engine air cleaner element; Inspect/clean engine ground	—	1000 hr
Fuel filter	Drain fuel system primary filter/water separator	—	500 hr
Oil filter	Inspect, 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
Battery	Check battery electrolyte level	—	500 hr
Belt	Inspect, 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
Coolant	Check 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		—
Oil	Change engine oil and filter	—	12000 hr
Spark plug	Inspect, 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

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

Item	Action	Hours	Months	Notes
Engine oil filter	Replace	440 hr		Last changed 8-12-24 at 440.8 Hrs

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Pressure	Oil pressure	37 / 35 / 34 / 34 / 34 / 35		during load bank test at 300 kW (unit not stated in document)
Speed	Frequency	60	Hz	during load bank test
Temperature	Ambient temperature	70 to 72	°F	test room ambient
Temperature	Coolant freeze protection	-35	°F	coolant level check
Temperature	Coolant temperature	180	°F	during load bank test (178°F during cool down)
Voltage	DC voltage	28	V	during load bank test

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Generator Check list maintenance

Check coolant level and record freeze protection: -35F.
Visually inspect radiator: Good.
Visually inspect radiator hoses: Good.
Check condition of coolant hoses: Good.
Check condition of fuel hoses: Good.
Check condition of engine belts: Good.
Batteries and QTY: None.
Battery install date if applicable: 8/17.
Genset has battery charger: Yes.
Genset has coolant heater: E204747, 240/480V, 4990W 1PH.
Check engine oil level.
Engine oil filters last changed date and HRS: 8-12-24, 440.8 Hrs.
Inspect exhaust system for cracks / leaks: OPEN SKID UNIT.
Check rain cap for proper operation: OPEN SKID UNIT.
Generator end is 12 lead reconnectable; has PMG permanent magnet generator; electronic engine.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Cummins/Onan QSM11 family

110

Part #	Description	Category
140-2636	Element, Filter (Outer)	Air filter
140-2637	Cleaner, Air (Includes Elements)	Air filter
140-2638	Element, Filter (Inner)	Air filter
140-3288-02	Cleaner, Air	Air filter
RU3220	Air Cleaner	Air filter
2874862	Alternator 12V	Alternator
2874863	Alternator 24V	Alternator
3037425	Belt	Belt
A40-TB1-8	JUMPER WIRE	Belt
WF2072	Coolant Filter	Coolant filter
49c00185	Data Link	Data link
ES100027	Distribution Panel Wiring for T360 Series Single Phase Control	Distribution panel wiring
300-5815	Control, Pump - ECM	ECM / ECU
12000187	Engine position sensor	Engine position sensor
13200060	Engine Speed Control Switch	Engine speed control switch
33200082	Engine Stop Button	Engine stop button
V70509	Lube Oil	Fluid
12000183	Fuel filter	Fuel filter
3376807	Fuel filter	Fuel filter
FS1000	Fuel Filter	Fuel filter
15600049	Fuel Shutoff Valve	Fuel shutoff valve
ES100030	Standard Generator Wiring for T360 Series	Generator wiring
19400715	OEM Interface 21-Pin Harness Connector	Hose
19400718	OEM Interface 24-Pin Harness Connector	Hose
415-0566-15	Pipe, Suction	Hose
503-0098	Hose, Oil Drain - Bulk (Order By The Foot - 3 Feet Required)	Hose
503-0189	Clamp, Hose	Hose
505-0172	Nipple, Close (2 x 2")	Hose
518-0548-01	Clamp, Hose	Hose
A035N852	Hose, Drain - Bulk (Order by the Foot - 1 Feet Required)	Hose
38200567	Idle Adjustment Switch	Idle adjustment switch
ES100039	Idle-Run Wiring (Cummins)	Idle run wiring
3375049	Oil Filter Wrench	Oil filter
3397929	Oil filter wrench	Oil filter
LF9001	Lube Filter	Oil filter
LFg9001	Valvoline® Premium Blue®	Oil filter
12000186	Oil pressure and temperature sensor	Oil pressure and temperature sensor
13200087	Oil Pressure Gauge	Oil pressure gauge
05200182	Flywheel ring gear sensor	Service part / kit
102-1335	Plug, Oil Drain	Service part / kit
12000184	Rail pressure	Service part / kit
12000188	Freon compressor mounting location.	Service part / kit
134890	T360 Super Quiet Generator	Service part / kit
155-2409-04	Elbow, Exhaust	Service part / kit
155-3510	Elbow, Muffler	Service part / kit
155-3540	Silencer	Service part / kit
155-4022	Muffler	Service part / kit
155-4062	Muffler	Service part / kit
159-1208-01	Cap, Fuel	Service part / kit
159-1299	Bracket, Mounting	Service part / kit
159-1573-01	Tank, Fuel 300 Gallon	Service part / kit
19400716	Hard-Coupled	Service part / kit
19400734	Intermediate Speed Control	Service part / kit
19800802	Multiple Unit Synchronization	Service part / kit
307-2621-02	Relay, Start Solenoid (K4)	Service part / kit
3305070	Heater, 240V	Service part / kit
3315033	Heater, 120V	Service part / kit
338-4426	Harness, Wiring	Service part / kit
3823494	Lubricating oil filter	Service part / kit
3885910	Red Paint, Spray can	Service part / kit
415-0727	Tank, Day (19 Gallons)	Service part / kit
492000038	Operation and Maintenance Nanual	Service part / kit
49800897	Intermediate Speed Control	Service part / kit
49801587	Electronic Fan Clutch	Service part / kit
502-1259	Coupler, Coolant Heater	Service part / kit
504-0252	Valve, Solenoid - Fuel	Service part / kit
625-2141-01	Control, Fuel Tank	Service part / kit
8210G4-12VDC	1" 12V solenoid	Service part / kit
8210G4-24VDC	1" 24V solenoid	Service part / kit
961-0514	InPower Service Tool Kit	Service part / kit
961-0619	Generator Set Support	Service part / kit
98200038	Engine Steam Cleaning	Service part / kit
A045Z906	Isolator, Vibration	Service part / kit
A045Z908	Bracket, Switch	Service part / kit
A40-TB1-1	B+	Service part / kit
A40-TB1-11	(COMMON ALARM)	Service part / kit
A40-TB1-12	(B-)	Service part / kit
A40-TB1-30	COMMON ALARM	Service part / kit
A40-TB1-31	(COMMON ALARM)	Service part / kit
C2800	Fleetguard® refractometer	Service part / kit
CC2800	Fleetguard refractometer	Service part / kit
E204747	Coolant heater 240/480V 6420W 1PH	Service part / kit
LE9o01	Cummins Engine Company, Inc.	Service part / kit
ES100006	Overcurrent Relay Wiring	Overcurrent relay wiring
3376326	pulley pusher (2)	Pulley pusher
3377401	pulley pusher adapter (1)	Pulley pusher adapter
12000180	Fuel inlet to pump	Pump
12000185	Power steering pump mounting location	Pump
149-2699-01	Pump, Fuel - Assembly 2 GPM	Pump
149-2710-01	Pump, Fuel - With Motor 2 GPM	Pump
399-0117	Pump, Fuel Transfer	Pump
399-0121	Kit, Repair - Fuel Tank Pump	Pump
39200434	Governed rpm	Rpm governor
151-0411	Pickup, Magnetic	Sensor
193-0432	Sender, Oil Temperature (S2 Engine Block, E4 Oil Pan)	Sensor
193-0444	Sender, Oil Pressure (S1)	Sensor
308-0913-06	Switch, Float	Sensor
309-0269	Sender, Temperature-Lo Engine	Sensor
309-0701-01	Switch, Level - High and Low	Sensor
309-0702-01	Switch, Level - Rupture Basin	Sensor
415-0565-15	Gauge, Liquid Level	Sensor
420-0609-01	Gauge - Fuel Level	Sensor
13200052	Slow Idle Feature	Slow idle feature
ES100026	Three Position Stack Switch Wiring	Stack switch wiring
2871254	Starter 12V	Starter
3103916	Starter 24V	Starter
3200069	STOP CHECK!	Stop check
43200086	Tachometer w/Hour Meter	Tachometer
190-0200	Thermostat	Thermostat
43200085	Voltmeter	Voltmeter

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Cummins/Onan QSM11G4?

The Cummins/Onan QSM11G4 engine has an oil capacity of 36.7 L (38.8 US qt).

What is the displacement of the Cummins/Onan QSM11G4?

The Cummins/Onan QSM11G4 has a displacement of 10.8 liters with 6 cylinders.

Which generators use the Cummins/Onan QSM11G4 engine?

The Cummins/Onan QSM11G4 powers 5 generator set(s), including Cummins/Onan DQHAA, Cummins/Onan DQHAB, Cummins/Onan DQHAB-6515690, Cummins/Onan DQHAB-7229336, Terex T360 Super Quiet Generator.

How often should you change the oil in the Cummins/Onan QSM11G4?

The Cummins/Onan QSM11G4 oil change interval is every 12000 hours.

What is a common problem with the Cummins/Onan QSM11G4 engine?

A commonly reported issue on generators using the Cummins/Onan QSM11G4 is: LOW BAT VOLTAGE — Warning. Cause: Battery voltage supply to the control is approaching a low level at which unpredictable operation will occur; discharged or defective battery. Fix: Check the battery charger fuse. Recharge or replace the battery.