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Cummins/Onan M11 Engine

The Cummins/Onan M11 is a 10.8 L 6-cylinder engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the DQAA, DQAB, M1i Series Engines and ps200da. It holds 34.1 L (9.0 gal) of oil and 52.2 L (13.8 gal) of coolant.

Also known as: Cummins M11

Part of the Cummins/Onan M11 engine family — 2 variants share parts & fitment.

10.8 L

Displacement

Cylinders

1800 rpm

Rated speed

34.1 L

Oil capacity

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Oil capacity	34.1 L
Coolant capacity	52.2 L
Displacement	10.8 L
Cylinders	6
Rated speed	1800 rpm

Generator sets powered by this engine

Cummins/Onan DQAA Cummins/Onan DQABCummins/Onan M1i Series EnginesCummins/Onan ps200da

This engine also powers 5 machine(s) on Power Equipment Info.

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

Common problems

Engine Power Output Low
Cause: Vehicle Drive Train Not Correctly Matched to Engine
Fix: Review specifications of engine and drive train components.
Coolant Temperature Above Normal — Gradual Overheat
Cause: Coolant Level Low
Fix: Inspect for external leaks on engine and radiator and make repairs. Add coolant.
Lubricating Oil Pressure Low
Cause: Incorrect Oil Level
Fix: Check for oil leaks. Add or drain engine oil. Check dipstick calibration
Engine Difficult to Start or Will Not Start — Exhaust Smoke Present
Cause: Battery Does Not Have at Least 7 Volts
Fix: Recharge battery.
Lubricating Oil Sludge in the Engine Crankcase Excessive
Cause: Bulk Oil Supply Contaminated
Fix: Check oil supply. Drain oil and replace with non-contaminated oil. Replace oil filters
Fuel Consumption — Excessive
Cause: Verify Complaint
Fix: If low power is relevant, go to symptom tree Engine Power Output Low. If acceleration is poor, go to symptom tree Engine Acceleration and Response Poor. If excessive fuel consumption is relevant, continue with this chart.
Engine Starts But Will Not Keep Running
Cause: Fuel Level in Tank Too Low
Fix: Add fuel.
Engine Runs Rough or Misfires
Cause: Condition Only Occurs at Idle
Fix: Refer to the symptom chart Engine Runs Rough at Idle.
Engine Cranks But Will Not Start (No Smoke From Exhaust)
Cause: Fuel in Tank Too Low
Fix: Add fuel.
Smoke, White — Excessive
Cause: Engine Block Heater Malfunctioning
Fix: Check electrical source and wiring to cylinder block heater. Replace block heater as required. Refer to the manufacturer's instructions
Engine Will Not Shut Off
Cause: Fuel Pump Manual Override Open
Fix: Check to make sure manual override screw is out to maximum travel.
Engine Will Not Crank or Cranks Slowly (Electric Starting Motor)
Cause: Engine Drive Units Engaged
Fix: Disengage engine driven units.
Engine Runs Rough at Idle
Cause: Engine Operating in Low Ambient Temperatures
Fix: Refer to Cold Weather Operations, Bulletin No. 3387266-R.
Smoke, Black — Excessive
Cause: Intake Air System Restricted
Fix: Check intake air system for restrictions
Lubricating Oil Contaminated
Cause: Identify Contamination
Fix: Perform an oil analysis to determine the contaminates

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan M11.

Maintenance schedule

Item	Capacity	Part #	Interval
Air filter		3666075	6000 hr	Amazon eBay $129.80
Fuel filter		—	6000 hr
Oil filter		—	6000 hr
Battery		—	6000 hr
Belt		—	6000 hr
Coolant		—	6000 hr
Coolant filter		—	6000 hr
Oil	2.6 liters [0.7 U.S. gallon]	—	6000 hr
Spark plug		—	6000 hr

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

Repair guides

Step-by-step procedures compiled from the Cummins/Onan service manual for this engine.

Service intervals

Item	Action	Hours	Months	Notes
Fan/alternator belts	Inspect	50 hr		Weekly or at 50-hour intervals.
Air intake and engine exhaust	Inspect	100 hr		Noise emission maintenance schedule item F.
Enclosure panels	Inspect	100 hr		Noise emission maintenance schedule item E.
Fasteners and guards	Check	100 hr		Noise emission maintenance schedule item D.
Air compressor air cleaner element	Replace	250 hr
Coolant filter	Change	250 hr	6 mo	Do not change if SCA concentration level is over 3 units
Cooling systems	Inspect	250 hr		Noise emission maintenance schedule item G.
Fuel filter	Change	250 hr	6 mo	Whichever comes first
Isolation mounts	Inspect	250 hr		Noise emission maintenance schedule item H.
Lubricating oil	Change	250 hr	6 mo	Standby generator applications: 250 hours or 12 months, whichever comes first
Lubricating oil filter	Change	250 hr	6 mo
Compressor oil filter element	Replace	500 hr		First 50 and 150 h on new or overhauled units; thereafter every 500 h.
Compressor oil	Change	1000 hr	6 mo	Whichever comes first.
Engine	Clean	1500 hr		Steam clean
Engine mounting bolts	Check	1500 hr		Check torque
Shutters and thermatic fans	Check	1500 hr		If equipped
Turbocharger mounting nuts	Check	1500 hr		Check torque
Valves and injectors	Adjust	1500 hr		Adjust when engine is cold (60 C or below)
Water pump	Inspect	1500 hr		Check weep hole for leakage
Oil separator element	Replace	2000 hr	12 mo	Every twelve months or 2000 hours.
Scavenge orifice and related parts	Clean	2000 hr	12 mo	Once a year or every 2000 hours, whichever comes first.
Air compressor	Inspect	6000 hr
Coolant and antifreeze	Change	6000 hr	24 mo
Cooling system	Clean	6000 hr	24 mo	Whichever comes first
Fan hub	Inspect	6000 hr
Fan idler pulley assembly	Inspect	6000 hr
Fuel pump	Clean	6000 hr		Clean and calibrate
Injectors	Clean	6000 hr		Clean and calibrate
Turbocharger	Inspect	6000 hr
Vibration damper	Inspect	6000 hr
Air cleaner system	Inspect		1 mo	Monthly; check for leakage paths or inlet obstructions.
Automatic shutdown system	Test		1 mo	Monthly per maintenance schedule.
Battery connections and electrolyte	Check		1 mo	Monthly; keep posts clean, tight, lightly greased.
Compressor oil cooler exterior	Clean		1 mo	Monthly; direct compressed air with nonflammable safety solvent through core.
Engine coolant	Replace		12 mo	Replenish with fresh mixture every twelve months.
Engine coolant	Test		6 mo	Test freezing protection every six months or before freezing temperatures.
Engine radiator exterior	Clean		1 mo	Monthly; inspect for obstructions and clean between fins.
Fuel tank drain valve	Drain		6 mo	Every six months drain sediment or accumulated condensate.
Fuel/water separator element	Replace		6 mo	Maintenance schedule.
Hoses (oil, air, intake, etc.)	Inspect		1 mo	Monthly.

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
Clearance	Angular alignment T.I.R. limit	not more than .001	in per inch of radius	center of shaft to indicator axis
Clearance	Angular alignment maximum T.I.R.	0.001	inch per inch of radius (center of shaft to indicator axis)	measuring deflection to bolt heads
Clearance	Fan hub end clearance	0.08 MIN / 0.41 MAX	mm
Clearance	Float switch assembly float lift clearance below C-clip stop	1/8	inch (3 mm)	use a feeler gauge
Clearance	Generator-to-engine angular alignment (T.I.R.)	.001 in. per inch of radius (center of shaft to indicator axis), maximum	in	750 kW gensets and larger
Clearance	Turbocharger axial clearance	0.038 MIN / 0.089 MAX	mm
Clearance	Turbocharger radial bearing clearance	0.15 MIN / 0.64 MAX	mm
Clearance	Wheel bearing free play	0.001 to 0.012	in
Gap	Air compressor discharge line carbon deposit thickness (maximum)	1.6	mm
Gap	Autostart magnetic pickup air gap	0.015	in	1/4 turn counterclockwise from ring gear contact
Gap	MPU sensor to flywheel ring gear tooth	back it out one quarter turn	turn	sensor threaded in until it just touches gear tooth
Other	Angular alignment maximum T.I.R.	.001 inches per inch of radius	in/in	center of shaft to indicator axis
Other	Battery specific gravity, fully charged	approximately 1.260	specific gravity	at 80 F (27 C)
Other	Electric brake adjustment interval	200	miles	after first 200 miles, then at 3000 mile intervals
Other	Fuel lift height limit	6	feet	(1.8 meters) between fuel lift pump and bottom of dip tube
Other	GOV GAIN default value for paralleling applications	70	%
Other	Maximum cranking voltage drop	2	volts	difference between battery and starter terminals while cranking
Other	Nylon tubing insertion mark	7/8	in	from end of tubing; mark 1/16 in from sleeve for 3/8 in O.D., 1/8 in for 0.25 in O.D.
Other	Overcurrent shutdown threshold	110% of rated	% of rated	PCC time/current calculation
Other	Overcurrent warning threshold	110% of rated for 60 seconds	% of rated	generator output current
Other	Overload warning threshold	105% of standby or 115% of prime	% of rating	three-phase power output; load dump after five seconds, warning after 60 seconds
Other	REG VHZ (underfrequency roll-off) adjustable range	1 through 50; normal range 7 through 21
Other	Scavenge tube length	1/8 to 1/4	in	less than the element measurement
Other	Short circuit shutdown threshold	175% of rated	% of rated	generator output current
Other	Start delay adjustment range	0 to 300	seconds
Other	Stop delay adjustment range	0 to 600	seconds
Other	Throttle spring rod distance X	2.88	in	between spring mount and rod guide (73 mm)
Other	Under-frequency roll-off threshold (UFRO)	typically 59 Hz for 60 Hz applications and 49 Hz for 50 Hz applications	Hz	AVR UFRO pot preset
Other	Weak battery warning threshold	below 60% of nominal for two seconds	% of nominal	during starting
Pressure	Air cleaner cleaning maximum air pressure	100	psi	keep nozzle at least 1 in (25.4 mm) from pleated paper
Pressure	Cylinder block coolant pressure, closed thermostat	138 minimum / 275 maximum	kPa	1800 rpm - no load / closed thermostat
Pressure	Engine oil pressure - K19 normal	50-70	psi (345-482 kPa)	run mode
Pressure	Engine oil pressure - K38 normal	45-65	psi (310-448 kPa)	run mode
Pressure	Engine oil pressure - K50 normal	50-70	psi (345-482 kPa)	run mode
Pressure	Engine oil pressure - L10/M11 normal	30-50	psi (207-345 kPa)	run mode
Pressure	Engine oil pressure - NTA 855 normal	35-50	psi (241-345 kPa)	run mode
Pressure	Engine oil pressure - V28 normal	50-90	psi (345-620 kPa)	run mode
Pressure	Engine oil pressure after start	20	psi	should be above 20 psi; if not within five seconds, stop
Pressure	Engine oil pressure shutdown limit - L10/M11	20	psi (138 kPa)	run mode value
Pressure	Engine oil pressure shutdown limit - L10/M11	8	psi (55 kPa)	idle mode value
Pressure	Engine oil pressure warning limit - L10/M11	12	psi (83 kPa)	idle mode value
Pressure	Engine oil pressure warning limit - L10/M11	25	psi (172 kPa)	run mode value
Pressure	K19 engine idle oil pressure	20	psi (138 kPa)	idle
Pressure	K19 engine normal oil pressure	50-70	psi (345-482 kPa)	normal run
Pressure	K19 normal oil pressure (run/idle)	50-70 / 20	psi (345-482 / 138 kPa)	NORM run / IDLE
Pressure	K19 oil pressure shutdown limit	10	psi (69 kPa)	idle mode
Pressure	K19 oil pressure shutdown limit	35	psi (241 kPa)	run mode
Pressure	K19 oil pressure shutdown/warning limits	shutdown 35 psi (241 kPa) run; warning 40 psi (276 kPa) run; shutdown 10 psi (69 kPa) idle; warning 15 psi (103 kPa) idle	psi (kPa)
Pressure	K19 oil pressure warning limit	15	psi (103 kPa)	idle mode
Pressure	K19 oil pressure warning limit	40	psi (276 kPa)	run mode
Pressure	K38 engine idle oil pressure	20	psi (138 kPa)	idle
Pressure	K38 engine normal oil pressure	45-65	psi (310-448 kPa)	normal run
Pressure	K38 normal oil pressure (run/idle)	45-65 / 20	psi (310-448 / 138 kPa)	NORM run / IDLE
Pressure	K38 oil pressure shutdown limit	10	psi (69 kPa)	idle mode
Pressure	K38 oil pressure shutdown limit	35	psi (241 kPa)	run mode
Pressure	K38 oil pressure shutdown/warning limits	shutdown 35 psi (241 kPa) run; warning 40 psi (276 kPa) run; shutdown 10 psi (69 kPa) idle; warning 15 psi (103 kPa) idle	psi (kPa)
Pressure	K38 oil pressure warning limit	15	psi (103 kPa)	idle mode
Pressure	K38 oil pressure warning limit	40	psi (276 kPa)	run mode
Pressure	K50 engine idle oil pressure	20	psi (138 kPa)	idle
Pressure	K50 engine normal oil pressure	50-70	psi (345-482 kPa)	normal run

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

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant	50/50 mixture of good quality water and fully formulated antifreeze (40 to 60% working range)	TMC RP 329 (ethylene glycol) or TMC RP 330 (propylene glycol)		12.9 liters	Use ethylene glycol antifreeze year-round. 50/50 mixture gives -36 C freeze point and 110 C boiling point. SCA concentration must not fall below 1.2 units or exceed 3 units per gallon of cooling system capacity.
Coolant	soft water / E.G. / DCA mixture				Cooling system to be filled with soft water/E.G./DCA mixture (on-site review checklist).
Coolant	50/50 mixture of water and ethylene glycol		above -37°C	52.2 L	Permanent antifreeze with rust inhibitors; protection to -35°F (-37°C).
Engine oil	API CG-4 or CH-4 premium grade			34.1 L	Document states premium grade oils API CG-4 or CH-4 are recommended for the QSX15 engine. Engine lube capacity includes filter.
Engine oil	SAE 15W-40 multi-viscosity (arctic: synthetic CE/SF 5W-20 or 5W-30)	API CG-4 or CF-4		39.0 liters	Cummins Premium Blue or equivalent. Sulfated ash limit 1.85 mass percent (1.0 suggested). Total system capacity including filter approximately 39 liters [10.3 U.S. gal]; oil pan capacity 34 liters [9 U.S. gal]; filter capacity 2.6 liters [0.7 U.S. gal].
Fuel	ASTM No. 2 D diesel (blends of No. 2 D and No. 1 D below 0 C)	ASTM No. 2 D			Viscosity must be kept above 1.3 cSt at 40 C. Do not mix gasoline or alcohol with diesel fuel.
Fuel	Diesel				Day tank fuel transfer pump maintains reservoir of diesel fuel in the day tank.
Fuel	No. 2 Diesel	sulfur content not greater than 0.5%; minimum cetane number 42	above -9°C	538.0 L	Above 15°F (-9°C). Use clean diesel fuel only.
Grease	Lithium based grease	Mobilux No. 2 or Shell Alvania R3		2.74 oz (81 ml)	Generator end bearing. Temperature range -22F to +248F (-30C to +120C). Grease should be equally divided between the bearing, bearing cap cavity, and bearing cartridge cavity.
Grease	MIL-G-10924				Wheel bearing grease suitable for all ambient temperatures.
Grease	Lithium based grease, Mobilux No. 2 or Shell Alvania R3		-30°C to 120°C	2.74 oz (81 ml)	End bearing lubricant; grease equally divided between bearing, bearing cap cavity and bearing cartridge cavity.
Other	DOT 3 or DOT 4 brake fluid				Hydraulic brake system.
Other	IR XHP1001		-40°C to 18°C	98.4 L	Compressor lubricant; 500 psi design operating pressure range -40°F to 65°F.
Other	IR Performance 500	Mil-L-46167	-23°C to 52°C	98.4 L	Compressor lubricant; 100 psi to 300 psi design operating pressure.
Other	IR Pro-Tect		-23°C to 52°C	98.4 L	Compressor lubricant; 100 psi to 300 psi design operating pressure.
Other	IR XHP 505		-12°C to 18°C	98.4 L	Compressor lubricant; 350 psi design operating pressure range 10°F to 65°F.

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

Fault codes

Code	Name	Meaning	Severity	Action
101	IDLE MODE	Indicates that the engine is operating in idle mode (governed at 800 RPM, generator build-up inhibited).	Warning	Remove ground from engine idle input to return to normal speed and voltage.
102	EMERGENCY STOP	Indicates local or remote Emergency Stop.	Shutdown	Turn the switch clockwise and allow it to pop out (local only). Move the Run/Off/Auto switch to Off. Press the Reset switch. Select Run or Auto, as required.
200	LOW OIL PRESSURE	Indicates engine oil pressure has dropped to an unacceptable level.	Warning	If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow 201-SHUTDOWN procedure. Access the Oil Pressure menu prior to clearing the fault.
201	LOW OIL PRESSURE	Indicates engine oil pressure has dropped below the shutdown trip point.	Shutdown	Check oil level, lines and filters. If oil system is OK but oil level is low, replenish. Reset control and restart. Oil pressure limits are listed in Table 4-3.
204	OIL PRES SENDER	Indicates that the control has sensed that the engine oil pressure sender is out of its working range.	Warning	Check that the engine oil pressure sender is properly connected.
210	LOW COOLANT TEMP	Set is not operating. Warning occurs when engine coolant temperature is 70° F (21° C) or lower.	Warning	Indicates engine coolant heater is not operating or is not circulating coolant. Check coolant heater power supply, low coolant level, and heater element current draw.
211	HIGH COOLANT TEMP	Indicates the engine coolant temperature is getting close to the recommended maximum temperature limit: 215° F (102° C) − standby or 207° F (97° C) − primary.	Warning	Reduce load if possible by turning off non-critical loads. Check air inlets and outlets and remove any obstructions to airflow. If engine can be stopped, follow 212-SHUTDOWN procedure.
212	HIGH COOLANT TEMP	Indicates engine has overheated (coolant temperature above 215° F (102° C) − standby or 207° F (97° C) − primary).	Shutdown	Allow engine to cool down completely. Check for obstructions to cooling airflow; check fan belt; check coolant mixture; check blower fan and circulation pumps on remote radiator installations. Reset control and restart.
213	COOLANT SENDER	Indicates that the resistance of the coolant temperature sender is out of range.	Warning	Check the resistance of the sender. Resistance should be 500 to 2k ohms.
214	LOW COOLANT LVL	Indicates engine coolant level has fallen below the trip point.	Warning	Allow engine to cool down completely. Check coolant level in both radiator and coolant recovery bottle and replenish if low. Look for coolant leakage points and repair if necessary.
215	LOW COOLANT LVL	Indicates engine coolant level has fallen below the trip point.	Shutdown	Allow engine to cool down completely. Check coolant level in both radiator and coolant recovery bottle and replenish if low. Reset control and restart after correcting problem. Shutdown will not occur if genset is in Idle mode (low coolant warning only).
220	MAG PICKUP	Indicates mag pickup speed indication is not being sensed or does not match generator set output frequency.	Shutdown	Restart and check RPM on the digital display.
221	FAIL TO CRANK	Indicates possible fault with control or starting system.	Shutdown	Check fuse F3 on the Engine Interface board. Check for poor battery cable connections; clean battery cable terminals and tighten. Recharge or replace a discharged or defective battery.
222	OVERCRANK	Indicates possible fuel system problem.	Shutdown	Check for empty fuel tank, fuel leaks, or plugged fuel lines. Check for dirty fuel filter and replace if necessary. Check for dirty or plugged air filter and replace if necessary. Reset the control and restart after correcting the problem.
223	OVERSPEED	Engine has exceeded normal operating speed (115% ±1% of nominal).	Shutdown	Check mechanical fuel linkage and actuator; check governor output module (A38) and digital board (A32).
224	FAIL TO SYNCHRONIZE	Generator set has not synchronized to the system bus within the allowable time frame.	Warning	Check governor system stability; adjust governing and synchronizer parameters; check fuel system.
226	FAIL TO CLOSE	Paralleling breaker has been given a signal to close, but has not closed properly.	Shutdown	Verify breaker charging mechanism; check close signal; verify auxiliary contact signals.
230	LOW DC VOLTAGE	Indicates battery voltage is below 10 VDC.	Warning	Recharge or replace the battery; check the battery charger fuse. Clean and tighten battery cable connections. Check engine DC alternator; replace if normal charging voltage is not obtained. Check float level if applicable.
231	HIGH DC VOLTAGE	Indicates battery voltage exceeds 32 VDC.	Warning	Check float level on battery charger if applicable (lower float level). Check engine DC alternator; replace if normal battery charging voltage is not obtained.
232	WEAK BATTERY	Indicates battery voltage drops below 60% of nominal for two seconds, during starting.	Warning	Discharged or defective battery. See Warning message 230, LOW DC VOLTAGE.
240	LOW FUEL−DAY	Indicates day tank fuel supply is running low.	Warning	Check fuel supply and replenish as required.
241	LOW FUEL	Indicates day tank fuel supply is running low.	Warning	Check fuel supply and replenish as required.
250	EEPROM ERROR	PCC memory error; data corruption of critical operating parameters.	Shutdown	Perform initial start setup procedure; replace digital board (A32) if fault repeats.
251	EEPROM ERROR	PCC memory error; data corruption of noncritical operating parameters.	Warning	Perform adjustment and calibration procedures; replace digital board (A32) if fault repeats.
252	EEPROM ERROR	PCC memory error; data corruption of noncritical operating parameters.	Warning	Verify selected values; repeat save operation; replace digital board (A32) if fault repeats.
260	CUSTOMER FAULT 1	When a customer defined input is closed to ground, the corresponding fault message is displayed. Default message; editable for customer site requirements.	Warning	Fault functions can be programmed to initiate a shutdown or a warning.
261	GROUND FAULT	When a customer defined input is closed to ground, the corresponding fault message is displayed. Default message; editable for customer site requirements.	Warning	Fault functions can be programmed to initiate a shutdown or a warning.
262	RUPTURE BASIN	When a customer defined input is closed to ground, the corresponding fault message is displayed. Default message; editable for customer site requirements.	Warning	Fault functions can be programmed to initiate a shutdown or a warning.
263	HIGH GEN TEMP	When a customer defined input is closed to ground, the corresponding fault message is displayed. Default message; editable for customer site requirements.	Warning	Fault functions can be programmed to initiate a shutdown or a warning.
270	PHASE ROTATION	The phase relationship between the generator set and the system bus is not matched.	Shutdown	Verify genset phase rotation matches bus; verify control wiring to bus PT module.
272	FIRST START	PowerCommand control is not receiving a proper signal from the system master first start sensor.	Warning	Verify Master First Start Sensor and interconnection wiring.
301	HIGH AC VOLTAGE	One or more phase voltages exceeded 130% of nominal, or exceeded 110% of nominal for 10 seconds.	Shutdown	Check PCC, alternator, excitation circuit, and PT/CT module wiring.
303	LOW AC VOLTAGE	One or more phase voltages dropped below 85% of nominal for 10 seconds.	Shutdown	Check PMG/field wiring, rotating rectifier, load and connectors.
313	UNDER FREQUENCY	Indicates that engine speed has dropped below 90% of nominal for 10 seconds. Five seconds before shutdown, a Load Dump signal is initiated.	Shutdown	Check fuel supply, intake air supply and load.
320	OVERCURRENT	Indicates that generator output current has exceeded 110% of rated for 60 seconds.	Warning	Check load and load lead connections.
321	OVERCURRENT	Indicates that generator output current has exceeded 110% of rated, and that a PCC time/current calculation has initiated an overcurrent shutdown.	Shutdown	Check load and load lead connections.
322	SHORT CIRCUIT	Indicates that generator output current has exceeded 175% of rated.	Shutdown	Check load and load lead connections.
330	OVERLOAD	Indicates that three-phase power output exceeds 105% of standby (or 115% of prime) rating. After five seconds, the Load Dump output is activated. After 60 seconds, the OVERLOAD warning is activated.	Warning	Check load and load lead connections.
335	REVERSE POWER	Indicates improper CT or PT phasing. (Non-parallel units only.)	Shutdown	Check CT / PT wiring. Refer to CT Installation in Section 5.
337	LOSS OF EXCITATION	Alternator excitation system is improperly adjusted or has failed.	Shutdown	Check output voltage calibration, load sharing lines, and leading power factor loads.
FAULT 1	Fault 1 (Red)	Engine shut down because of a customer-connected system fault; part of a 10 second time delay shutdown circuit.	Shutdown	Service as required by the customer-supplied fault indicating switches.
FAULT 2	Fault 2 (Red)	Engine shut down because of a customer-connected system fault; part of a non-time delay shutdown circuit.	Shutdown	Service as required by the customer-supplied fault indicating switches.
GF	Ground Fault Alarm (Optional)	Ground fault relay monitors neutral to ground connection and line to neutral, activating a fault alarm when the connection is broken or a ground fault is sensed.	Warning	Clear fault condition by pushing the Run/Stop (Reset)/Remote switch to Reset (auto reset link set at factory).
HET	High Engine Temperature (Red)	Engine shut down because of excessively high engine coolant temperature (greater than 230 deg F).	Shutdown	Check coolant level and leaks; service cooling system; reset engine control.
LET	Low Engine Temperature (Yellow)	Engine temperature is less than 70 deg F and the engine might not start.	Warning	Plug in, repair or install engine coolant and oil heaters.
LOP	Low Oil Pressure (Red)	Engine shut down because of excessively low engine oil pressure (less than 14 psi).	Shutdown	Check oil level and oil leaks; service lubricating system; reset engine control.
LOW FUEL	Low Fuel (Yellow)	Fuel level in the supply tank has dropped below the reserve necessary to run the set at full load for the prescribed number of hours.	Warning	Fill the main fuel supply tank with the appropriate grade of fuel.
OC	Overcrank (Red)	Engine shut down because it did not start during the timed cranking period (approximately 75 seconds, including two rest periods).	Shutdown	Service the set as necessary; reset engine control.
OS	Overspeed (Red)	Engine shut down because of overspeed.	Shutdown	Adjust the Electronic Overspeed Module; check governor for binding; reset engine control.
PRE-HET	Pre High Engine Temperature (Yellow)	Engine coolant temperature is abnormally high (greater than 220 deg F).	Warning	Shut down if possible or disconnect non-critical loads; service cooling system.
PRE-LOP	Pre Low Oil Pressure (Yellow)	Engine oil pressure is abnormally low (less than 20 psi).	Warning	Shut down if possible or disconnect non-critical loads; service lubricating system.
RUN	Run (Green)	Generator set is running and the starter has been disconnected.	Info
SWITCH OFF	Switch-off (Flashing Red)	The Run/Stop/Remote switch is in the Stop position, preventing remote automatic operation.	Info	Push the Run-Stop-Remote switch to Remote.

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

Procedures

Aligning Generator with Engine (Angular Alignment) adjustment

⚠ Accidental starting of the generator set during this procedure presents the hazard of severe personal injury or death.

Tools: Dial indicator, Shims

Disconnect the negative (-) battery cable(s) before beginning.
Fasten a dial indicator to the generator shaft or cooling fan with the sensing point on the capscrew head or flat surface of the drive disc at the bolt circle diameter.
Bar the engine over in a clockwise rotation as viewed from engine flywheel; do not allow it to roll back on compression.
Determine the total indicator reading (T.I.R.) as the sum of the maximum positive and negative dial indicator readings over one revolution.
Measure the distance from the center of the generator shaft to the indicator measuring point.
Measure the distance from the generator side of the flex discs to the center of the generator mounting bolt.
Compare the distances; multiply this ratio times one half the T.I.R. to approximate the amount of shims to remove or add.

Angular Alignment Procedure adjustment

⚠ Accidental starting of the generator set during this procedure presents the hazard of severe personal injury or death. Make sure to disconnect the negative (-) battery cable(s) before beginning.

Tools: Dial indicator, Wooden shims

Disconnect the negative (-) battery cable(s) before beginning.
Fasten a dial indicator to the generator shaft or cooling fan with sensing point on capscrew head or flat surface of drive disc at bolt circle diameter.
Bar the engine over in a clockwise rotation as viewed from engine flywheel; do not allow it to roll back on compression.
Record maximum positive and negative dial indicator readings as the engine completes one revolution.
T.I.R. equals the sum of the maximum positive and negative readings.
Maximum T.I.R. should not be more than .001 inch for each inch of radius.
Remove equal shims from under both generator mounting feet to lower the generator.

Angular Alignment Procedure (Generator to Engine) adjustment

⚠ Accidental starting during this procedure presents the hazard of severe personal injury or death.

⚠ Do not bar engine over by prying on fan blade.

Tools: dial indicator

Disconnect the negative (-) battery cable(s) before beginning.
Fasten a dial indicator to the generator shaft or cooling fan with sensing point resting on the drive disc capscrew head/flat surface at the bolt circle diameter.
Bar the engine over in a clockwise rotation as viewed from the engine flywheel; do not allow it to roll back on compression at the end of travel of each reading.
Record the total indicator reading (T.I.R.) as the sum of the maximum positive and negative dial indicator readings over one engine revolution.
Compare the measured T.I.R. to the maximum allowed (.001 in. per inch of radius from center of shaft to indicator axis); add or remove shims under the generator mounting feet to correct.

Axial Alignment Procedure (Generator to Engine) adjustment

Tools: dial indicator

Fasten a dial indicator holding device to the skid base, engine block, or generator shell with the sensor point resting on the generator shaft hub.
Bar the engine over in a clockwise rotation through a couple of rotations, recording indicator readings at eight equally spaced points around the shaft diameter to obtain axial T.I.R.
Reduce the measured T.I.R. runout by one half if excessive vibration remains after angular alignment.

Drive Belt, Alternator - Adjust adjustment

Tools: Belt tension gauge, Part No. ST-1293

Loosen the adjusting screw locknut.
Loosen the adjustment link locking capscrew.
Loosen the pivot capscrew and nut.
Use belt tension gauge, Part No. ST-1293, to measure belt tension.
Turn the alternator adjusting screw clockwise to tighten the belt.
Tighten the adjusting screw locknut against the retainer and the adjustment link locking capscrew.
Tighten the pivot capscrew and nut.

Drive Belt, Cooling Fan - Adjust adjustment

⚠ Do not adjust belt tension to full value with the adjusting screw. Belt tension can increase when the locknut is tightened and cause reduced belt and bearing life.

Tools: Belt tension gauge, Part No. ST-1293

Loosen the idler pulley shaft locknut.
Use belt tension gauge, Part No. ST-1293, to adjust the belt to the correct tension.
Tighten the idler pulley shaft locknut.
Check the belt tension again to make sure the belt is not too tight.

Electric brake adjustment adjustment

Tools: Jack, Jack stands, Screwdriver or standard adjusting tool

Jack up trailer and secure on adequate capacity jack stands; check wheel and drum rotate freely.
Remove adjusting hole cover from slot on bottom of brake backing plate.
Rotate starwheel of adjuster assembly to expand brake shoes until wheel is very difficult to turn.
Rotate starwheel in opposite direction until wheel turns freely with a slight lining drag.
Replace adjusting hole cover and lower wheel to ground.
Repeat procedure on all brakes.

Governor Calibration Checks adjustment

Tools: Frequency meter or tachometer, Jumper wire

Start the generator set.
Adjust engine no-load speed to the desired allowable speed droop using the Run Speed potentiometer.
With no load, turn GAIN clockwise slowly until engine speed oscillates.
Reduce GAIN slowly counterclockwise until engine speed is stable.
Upset the governor by momentarily shorting terminals 7 and 10 on the governor control.
Apply and remove loads to check generator set response.

HC4-7 Axial Alignment Procedure adjustment

Tools: Dial indicator with magnetic base or clamp

Check only when an objectionable vibration is present.
Fasten dial indicator holding device to skid base, engine block, or generator shell with magnetic base or clamp.
Position sensor point on the generator shaft hub.
Bar the engine over in a clockwise rotation as viewed from engine flywheel through a couple of rotations.
Record indicator readings in eight equally spaced points around the shaft diameter.
Remove the capscrews connecting drive discs and flywheel and mark discs and flywheel.
Rotate engine or generator so drive disc holes are repositioned 180 degrees from original location.
Put capscrews back in and retorque. Recheck shaft alignment.
If runout unchanged, rotate discs to 30, 60 or 90 degrees from original location.
If T.I.R. does not improve, inspect flywheel pilot and drive disc runouts.

Overhead Set - Adjust Valves and Injectors (STC) adjustment

⚠ Do not pull or pry on the fan to manually rotate the crankshaft.

⚠ An overtightened setting on the injector adjusting screw will produce increased stress on the injector train and the camshaft injector lobe.

Tools: STC tappet adjusting tool, Part No. 3823348, Torque wrench, Part No. 3376592, Torque wrench adapter, Part No. ST-669, Feeler gauges

Remove the crankcase breather tube from the crankcase breather outlet.
Remove the 16 capscrews, isolators, and spacers from the cover.
Remove the rocker lever cover and gasket.
Rotate the accessory drive shaft clockwise until the A valve set mark aligns with the pointer.
Loosen the injector adjusting screw locknut and tighten the adjusting screw until clearance is removed; then one additional turn to seat the link.
Loosen the adjusting screw until the STC tappet touches the top-cap of the injector.
Place the STC tappet adjusting tool, Part No. 3823348, on the top-cap and insert the locating pin.
Apply thumb pressure to hold the tappet in the maximum upward position.
Use torque wrench, Part No. 3376592, to tighten the adjusting screw to 0.6 to 0.7 Nm [5 to 6 in-lb].
Hold the adjusting screw and tighten the locknut to 61 Nm [45 ft-lb] without adapter or 47 Nm [35 ft-lb] with adapter ST-669.
Remove the tappet adjusting tool and check the injector push rod can be rotated by hand.
Adjust the valves on the appropriate cylinder with a feeler gauge per the sequence chart.
Tighten the valve adjusting screw and locknut, then check lash with a feeler gauge.
Install the cover, 16 isolators, spacers and capscrews; tighten to 15 Nm [130 in-lb].

P7 Axial Alignment Procedure adjustment

Check only when an objectionable vibration is present.
Remove the capscrews connecting drive discs and flywheel.
Mark the drive discs and flywheel with respect to each other.
Rotate engine or generator so drive discs holes are repositioned two bolt holes from original location.
Put capscrews back in and retorque. Recheck/record vibration levels.
Repeat this test until drive disc holes are repositioned 180 degrees from original location.
Review vibration data and position drive disc in lowest recorded level location.

Parking brake adjustment adjustment

⚠ New cables will stretch and should be readjusted after first week of use.

Tools: Wrenches, Grease

Turn knob on brake lever until lever is perpendicular to bracket in OFF position; wheels should turn freely.
With lever OFF, adjust brake cables until each has approximately the same tension.
Move lever ON and check each wheel will not rotate; adjust knob or cables as needed.
Apply grease to cable strands from conduit six inches toward lever.

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

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
		12 lead generator sets	Load wires are routed through the CTs	Reconnectable gensets (12 leads) have dual secondary CTs (3 pins); CT wire 2/3 to pin 2 (high voltage) or pin 3 (low voltage).
		6 lead generator sets	Generator output leads are routed through the CTs	Non-reconnectable gensets (6 leads) have single secondary CTs (2 pins).
		Cummins PowerCommand generic AC Reconnect Wiring Diagram 625-2755 (Rev. D) and 625-3100 (Rev. F)		Applies to models DFAA, DFAB, DFAC, DFBF, DFCB, DFCC, DFEB, DFEC, DFFB, DFGA, DFGB, DFJA, DFJB, DFJC, DFJD, DFLB, DFLC, DFLD, DFMB (625-2755) and models DFAA-DFMB plus DFCE, DFED, DQAA, DQAB, DQBA, DQBB (625-3100).
	A	CT21 – U load leads	A phase	CT dot must face the generator; CT terminal 1 connects to metering circuit; terminal 2/3 connects to ground.
	A (U)	Bus PT module TB1 A	bus A phase	Bus PT module A39.
	A (U)	CT21	U load leads (A phase)	CT dot must face the generator; CT terminal 1 connects to metering circuit, terminal 2/3 to ground.
	B	CT22 – V load leads	B phase	CT dot must face the generator; CT terminal 1 connects to metering circuit; terminal 2/3 connects to ground.
	B (V)	Bus PT module TB1 B	bus B phase	Bus PT module A39.
	B (V)	CT22	V load leads (B phase)	CT dot must face the generator; terminal 1 to metering circuit, terminal 2/3 to ground.
	C	CT23 – W load leads	C phase	CT dot must face the generator; CT terminal 1 connects to metering circuit; terminal 2/3 connects to ground.
	C (W)	Bus PT module TB1 C	bus C phase	Bus PT module A39.
	C (W)	CT23	W load leads (C phase)	CT dot must face the generator; terminal 1 to metering circuit, terminal 2/3 to ground.
	N	Bus PT module TB1 N	bus neutral	Bus PT module A39.
high voltage genset		12-lead CT secondary wire marked 2/3 to pin 2	2/3	For high voltage gensets.
low voltage genset		12-lead CT secondary wire marked 2/3 to pin 3	2/3	For low voltage gensets.

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 M11 family

112

Part #	Description	Category
256837	Air Compressor Air Cleaner Element - Two-Cylinder, Sponge Element	Air filter
36867786	ELEMENT, PRIMARY	Air filter
36876019	ELEMENT, SAFETY	Air filter
36893840	ELEMENT, PRIMARY — air cleaner primary element	Air filter
36893857	ELEMENT, SAFETY — air cleaner safety element	Air filter
WF2050	Fleetguard DCA (Fleetcool) Service Filter, 2 SCA units	Coolant filter
WF2052	Fleetguard DCA (Fleetcool) Service Filter, 6 SCA units	Coolant filter
WF2053	Coolant	Coolant filter
WF2054	Coolant	Coolant filter
WF2055	Fleetguard DCA (Fleetcool) Service Filter, 23 SCA units	Coolant filter
WF2070	Coolant Filter	Coolant filter
WF2071	Coolant	Coolant filter
WF2072	Coolant Filter	Coolant filter
WF2073	Coolant Filter	Coolant filter
WF2074	Coolant	Coolant filter
WF2076	Coolant	Coolant filter
WF2077	Blank coolant filter without SCAs	Coolant filter
0300-4623-05	DFAA (600V)	Current transformer
0300-4623-07	DFAC (600V)	Current transformer
0300-4623-17	DFAA BR (0-480V)	Current transformer
0300-4623-21	DFAC BR (0-480V)	Current transformer
DCA75L	DCA4 Liquid, 18.9 l [5 U.S. gal], 200 SCA units	Fluid
3315843	Fuel-Water Separator (Superfilter) (Fleetguard Part No. FS-1212)	Fuel filter
35357268	FILTER, FUEL	Fuel filter
36893314	FILTER, WATER	Fuel water separator
35328251	GASKET	Gasket
35575570	GASKET	Gasket
35597723	GASKET	Gasket
35611359	GASKET	Gasket
36786572	GASKET	Gasket
39482138	GASKET	Gasket
39925367	GASKET	Gasket
35135458	HOSE (47 INCHES)	Hose
35136548	HOSE ASSEMBLY — fuel supply	Hose
35286772	HOSE (58 INCHES)	Hose
35330570	HOSE	Hose
35356443	HOSE ASSEMBLY	Hose
35356534	HOSE	Hose
36856920	HOSE	Hose
36881928	HOSE ASSEMBLY — fuel return	Hose
36893691	HOSE, DISCHARGE	Hose
3318853	Combination Full-Flow/Bypass Lubricating Oil Filter	Oil filter
35378546	ELEMENT, ENG. LUBE — engine lube filter element	Oil filter
36860336	ELEMENT, FILTER — compressor oil filter element	Oil filter
LF670	Full Flow lubricating oil filter	Oil filter
LF777	Lube, By-Pass Spin-On	Oil filter
35296409	SAFETY VALVE, 250 PSI	Service part / kit
35316876	BEARING, INNER — wheel bearing	Service part / kit
35316884	CUP, INNER — bearing cup	Service part / kit
35335140	CAP, RADIATOR	Service part / kit
35359413	SHOE, FRONT — brake shoe	Service part / kit
35359421	SHOE, REAR — brake shoe	Service part / kit
35385277	CUP, OUTER — bearing cup	Service part / kit
35385293	BEARING, OUTER — wheel bearing	Service part / kit
35592534	DIAPHRAGM	Service part / kit
36793545	BATTERY	Service part / kit
36840841	24 VOLT SOLENOID	Service part / kit
36844579	'Y' strainer	Service part / kit
36845014	CAP, FUEL TANK	Service part / kit
36881944	24 VOLT SOLENOID — start/run valve	Service part / kit
36891315	ELEMENT — oil separator element	Service part / kit
36892523	BATTERY (DRY)	Service part / kit
3823494	Lubricating oil filter	Service part / kit
39225511	SAFETY VALVE, 200 PSI	Service part / kit
39240411	FILTER, 2ND STAGE — IQ System filter	Service part / kit
39240726	FILTER, 1ST STAGE — IQ System filter	Service part / kit
39240858	FILTER, 3RD STAGE — IQ System filter	Service part / kit
98/37/EC	Not specified in the document	Service part / kit
CC2602	Fleetguard coolant test kit	Service part / kit
CC2800	Fleetguard refractometer	Service part / kit
EN29001	Not specified in the document	Service part / kit
EN292	Not specified in the document	Service part / kit
HP1300WCU	Not specified in the document	Service part / kit
HP825WCU	Not specified in the document	Service part / kit
HP935WCU	Not specified in the document	Service part / kit
PN8NTC2	Not specified in the document	Service part / kit
VHP1050WCU	Not specified in the document	Service part / kit
VHP750WCAT	Not specified in the document	Service part / kit
VHP825WCU	Not specified in the document	Service part / kit
VHP850WCAT	Not specified in the document	Service part / kit
XHP1070WCU	Not specified in the document	Service part / kit
XHP1170WCU	Not specified in the document	Service part / kit
XHP1300WCU	Not specified in the document	Service part / kit
XHP650WCAT	Not specified in the document	Service part / kit
XHP750WCAT	Not specified in the document	Service part / kit
XHP825WCAT	Not specified in the document	Service part / kit
XHP900WCAT	Not specified in the document	Service part / kit
XP1050WCU	Not specified in the document	Service part / kit
XP900WCU	Not specified in the document	Service part / kit
35279942	O-RING	Seal
35316868	SEAL, GREASE — inner wheel seal	Seal
35328244	SEAL	Seal
35359405	KIT, WHEEL CYLINDER	Seal
35367374	O-RING — minimum pressure check valve	Seal
35593508	SEAL, SHAFT	Seal
36866028	O-RING	Seal
39253984	O-RING	Seal
39253992	O-RING	Seal
95024312	O-RING	Seal
95280541	O-RING	Seal
95358164	O-RING	Seal
35356799	COOLANT LEVEL PROBE	Sensor
35367218	300°F TEMPERATURE SENDER	Sensor
35371673	215°F TEMPERATURE SWITCH	Sensor
35604180	3 CYL. ENG. TEMP. SENDER	Sensor
36843423	25 PSI PRESSURE SWITCH	Sensor
36847838	ENGINE/COMPR. AIR FILTER RESTRICTION SW.	Sensor
36865756	SEP. TANK SAFETY VALVE TEMP. SW.	Sensor
36870608	150 PSI PRESSURE SENDER	Sensor
36878379	12 PSI PRESSURE SWITCH	Sensor
36893949	SENDER, FUEL — fuel level sender	Sensor
LT215/85R16/E	Tire Size/Load Range	Tire

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

Aftermarket parts that fit this engine

0327-1507 FridayParts $499.99 FP-XP-0041835

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Common questions

What is the oil capacity of the Cummins/Onan M11?

The Cummins/Onan M11 engine has an oil capacity of 34.1 liters.

What is the displacement of the Cummins/Onan M11?

The Cummins/Onan M11 has a displacement of 10.8 liters with 6 cylinders.

Which generators use the Cummins/Onan M11 engine?

The Cummins/Onan M11 powers 4 generator set(s), including Cummins/Onan DQAA, Cummins/Onan DQAB, Cummins/Onan M1i Series Engines, Cummins/Onan ps200da.

How often should you change the oil in the Cummins/Onan M11?

The Cummins/Onan M11 oil change interval is every 6000 hours.

What is a common problem with the Cummins/Onan M11 engine?

A commonly reported issue on generators using the Cummins/Onan M11 is: Engine Power Output Low. Cause: Vehicle Drive Train Not Correctly Matched to Engine. Fix: Review specifications of engine and drive train components..