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Cummins/Onan QSM11-G2 Engine

The Cummins/Onan QSM11-G2 is an engine. It powers generator sets from Cummins/Onan, including the 275DQAE, DQAF and DQAF-5630694.

Also known as: Cummins QSM11-G2, QSM11G2

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

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

Engine specifications

Generator sets powered by this engine

Cummins/Onan 275DQAE Cummins/Onan DQAFCummins/Onan DQAF-5630694

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

Common problems

Engine cranks but does not start (OVERCRANK (222) message; while cranking, Run LED DS12 on the engine interface board (A31) is on)
Cause: Restricted fuel supply due to: a. Fuel level below pickup tube in tank
Fix: Add fuel if low. Prime the fuel system
Engine does not crank — remote run (FAIL TO CRANK (221) message does not appear on digital display; Auto LED DS5 on the engine interface board (A31) is off; RMT Start LED DS14 on the customer interface board (A34) is on)
Cause: The Auto mode signal is not getting from engine interface board A31 to digital board A32, indicating that A31 is bad
Fix: Install harness tool between A32 J4/P4. Check for ground output at A32 J4-18. If there is no ground output (but A31 DS5 is on) engine interface board A31 is bad. Replace A31. If there is a ground output at A31 J1-18, proceed to the next step
EEPROM ERROR — Warning lamp lights 251
Cause: Indicates PCC memory error. Data corruption of noncritical operating parameters.
Fix: Contact an authorized service center.
Engine does not crank — local run (FAIL TO CRANK (221) message does not appear on digital display; Run LED DS4 on the engine interface board (A31) is off)
Cause: Run/Off/ Auto select switch S12 or the wiring harness may be bad; The start input is not getting from the Run/Off/ Auto select switch (S12) to A31 indicating that S12, A31, or the harness is bad
Fix: Check continuity to ground at A31 J3-11. If ground is not present, replace A31. If ground is present, place S12 in Run and check continuity from P3-11 to P3-12. If no continuity, isolate to switch or wiring harness. Repair as necessary. If there is continuity, A31 may be bad
WEAK BATTERY — Warning lamp lights 232
Cause: Indicates battery voltage drops below 60% of nominal for two seconds, during starting. Discharged or defective battery.
Fix: See Warning message 230, LOW DC VOLTAGE.
UNDER FREQUENCY — Shutdown lamp lights 313
Cause: Indicates that engine speed has dropped below 90% of nominal for 10 seconds. NOTE: Five seconds before shutdown, a Load Dump signal is initiated.
Fix: Contact an authorized service center.
SHORT CIRCUIT — Shutdown lamp lights 322
Cause: Indicates that generator output current has exceeded 175% of rated.
Fix: Contact an authorized service center.
REVERSE POWER — Shutdown lamp lights 335
Cause: Indicates improper CT or PT phasing. (Non-parallel units only.)
Fix: Contact an authorized service center.
OVERSPEED — Engine runs and then shuts down, Shutdown lamp lights 223
Cause: Indicates engine has exceeded normal operating speed. (2070 rpm @ 60 Hz; 1800 rpm @ 50 Hz)
Fix: Contact an authorized service center.
OVERLOAD — Warning lamp lights 330
Cause: 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.
Fix: Contact an authorized service center.
OVERCURRENT — Warning lamp lights 320
Cause: Indicates that generator output current has exceeded 110% of rated for 60 seconds.
Fix: Contact an authorized service center.
OVERCURRENT — Shutdown lamp lights 321
Cause: Indicates that generator output current has exceeded 110% of rated, and that a PCC time/current calculation has initiated an overcurrent shutdown.
Fix: Contact an authorized service center.
OVERCRANK — Shutdown lamp lights; Engine stops cranking 222
Cause: Indicates possible fuel system problem.
Fix: A. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. b. Check for dirty fuel filter and replace if necessary. c. Check for dirty or plugged air filter and replace if necessary. d. Reset the control and restart after correcting the problem. Contact an authorized service center if none of the above.
OIL PRES SENDER — Warning lamp lights 204
Cause: Indicates that the engine oil pressure sender is not functioning correctly.
Fix: Check that the engine oil pressure sender is properly connected. Contact an authorized service center.
MAG PICKUP — Shutdown lamp lights 220
Cause: Indicates mag pickup speed indication is not being sensed or does not match generator set output frequency.
Fix: A. Restart and check RPM on the digital display. b. Contact an authorized service center.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSM11-G2.

Maintenance schedule

Item	Spec	Part #
Oil filter	9 HOURS ON ENGINE	—
Coolant	Level Good -40F	—
Oil	Oil level is full	—

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
Charge Air Piping	Check	8 hr		Daily or after 8 Hours; tighten hose clamps to 74 inch-lbs (8 N-m) if necessary
Coolant Level	Check	8 hr		Daily or after 8 Hours
Fuel Level	Check	8 hr		Daily or after 8 Hours
Genset	Inspect	8 hr		Daily or after 8 Hours; check for oil, fuel, cooling and exhaust system leaks; check exhaust system audibly and visually with set running
Oil Level	Check	8 hr		Daily or after 8 Hours
Air Cleaner	Check	50 hr		Weekly or after 50 Hours; clean if required; perform more often in dusty conditions
Air cleaner	Clean	50 hr		Weekly or after 50 Hours; clean if required. Perform more often in dusty conditions.
Battery Charging System	Check	100 hr	1 mo	Weekly or after 50 Hours
Coolant heater(s)	Check	50 hr		Weekly or after 50 Hours
Crankcase Oil	Drain	50 hr		First service — Break-in: drain and replace crankcase oil after the first 50 hours of operation on new generator sets
Exhaust Condensate Trap	Drain	50 hr		Weekly or after 50 Hours
Fuel Filter(s)	Drain	100 hr	1 mo	Weekly or after 50 Hours; drain 1 cup or more of fuel to remove water and sediment; refer to Cummins engine Operation and Maintenance Manual
Fuel Tank (Water and Sediment)	Drain	50 hr		Weekly or after 50 Hours; drain 1 cup or more of fuel to remove water and sediment
Starting Batteries	Check	100 hr	1 mo	Weekly or after 50 Hours
Anti-freeze and DCA Concentration	Check	250 hr	6 mo	Monthly or after 100 Hours; refer to Cummins engine Operation and Maintenance Manual
Drive belt tension	Check	100 hr	1 mo	Monthly or after 100 Hours; visually check belt for wear or slippage, replace if hard or brittle.
Fuel tank water and sediment	Drain	100 hr	1 mo	Monthly or after 100 Hours; drain 1 cup or more of fuel to remove water and sediment.
Radiator Hoses for Wear & Cracks	Check	100 hr		Monthly or after 100 Hours
Battery electrolyte level	Check	200 hr		Check at least every 200 hours of operation; fill cells to bottom of filler neck.
Coolant Filter	Change	250 hr	6 mo	6 Months or after 250 Hours; refer to Cummins engine Operation and Maintenance Manual
Crankcase Breather	Clean	250 hr	6 mo	6 Months or after 250 Hours; refer to Cummins engine Operation and Maintenance Manual
Air cleaner element	Change	500 hr		Yearly or after 500 Hours; perform more often in dusty conditions.
Cooling system	Clean	500 hr	12 mo	Yearly or after 500 Hours; refer to Cummins engine Operation and Maintenance Manual
Crankcase oil and filter	Change	500 hr	12 mo	Yearly or after 500 Hours. Prime power: change every 6 months or 250 hours. Standby: change oil every 12 months or 250 hours, whichever comes first.
Fuel Filters	Change	500 hr		Yearly or after 500 Hours; refer to Cummins engine Operation and Maintenance Manual
Radiator hoses	Check	500 hr		Yearly or after 500 Hours; check for wear and cracks.
Rupture basin leak detect switch	Test	500 hr	12 mo	Yearly or after 500 Hours; check leak detect switch in sub-base fuel tank of optional enclosure, once a year or as required by safety code.

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	Exhaust pipe clearance from combustible wall/partition	12	inches (305 mm)
Clearance	Float switch lift below C-clip stop	1/8 inch (3 mm)	inch (mm)	use a feeler gauge
Clearance	Fuel line clearance from electrical wiring	1/2	inch (12.7 mm)	minimum
Clearance	Fuel line clearance from hot exhaust parts	2	inch (51 mm)	minimum
Clearance	MPU sensor to flywheel gear tooth	back it out one quarter turn	turn	after sensor just touches gear tooth
Clearance	Minimum fuel level above fuel pump inlet for critical start	6	inches (150 mm)	recommended
Clearance	Vibration isolator top plate to base clearance	0.25	inch (6 mm)	nominal or greater
Other	Battery specific gravity (charge if below)	1.215		corrected
Other	Battery specific gravity (fully charged, corrected)	1.260		corrected to 80 F (27 C)
Other	Exhaust Outlet Size	5	in. NPT
Other	GOV RAMP adjustable range	0 through 10	seconds
Other	Ground Fault Relay current setting	5 to 1200	amperes
Other	Ground Fault Relay time delay setting	0 to 1	second
Other	Overcurrent warning	110% of rated for 60 seconds		generator output current
Other	Overload warning	105% of standby (or 115% of prime) rating		three-phase power output
Other	REG VHZ underfrequency roll-off adjustable range	1 through 50 (normal range 7 through 21)
Other	Short circuit shutdown	175% of rated		generator output current
Other	Voltage/frequency adjustment range (ADJUST menu)	+/- 5%	%
Pressure	Air cleaner cleaning air pressure	30	psi	cleaning element
Pressure	Air cleaner cleaning compressed air	30	psi (207 kPa)	max, clean side, nozzle at least 1 inch (25 mm) away
Pressure	Idle oil pressure	15	psi (104 kPa)	idle
Pressure	Idle oil pressure limit (unlabeled third value as printed)	8	psi	idle
Pressure	Idle oil pressure shutdown limit	12	psi	idle
Pressure	Idle oil pressure shutdown limit	8	psi (55 kPa)	idle
Pressure	Idle oil pressure warning limit	12	psi (83 kPa)	idle
Pressure	Idle oil pressure warning limit	15	psi	idle
Pressure	Max fuel inlet restriction	4	in. Hg (13.5 kPa)
Pressure	Max fuel return restriction	2.5	in. Hg (8.5 kPa)
Pressure	Max. Fuel Inlet Pressure	10	PSI (69 kPa)
Pressure	Max. Fuel Inlet Restriction	4	in. Hg. (13.5 kPa)
Pressure	Max. Fuel Return Restriction	2.5	in. Hg. (8.5 kPa)
Pressure	Maximum allowable exhaust back pressure	41	in. H20
Pressure	Maximum fuel inlet restriction	4	in. Hg.
Pressure	Maximum fuel return restriction	2.5	in. Hg.
Pressure	Normal oil pressure	207-345	kPa	normal operation
Pressure	Normal oil pressure	30-50	psi (207-345 kPa)
Pressure	Normal oil pressure shutdown limit	20	psi (138 kPa)
Pressure	Normal oil pressure warning limit	25	psi (172 kPa)
Pressure	Oil pressure shutdown limit	20	psi	normal operation
Pressure	Oil pressure warning limit	25	psi	normal operation
Pressure	Radiator cleaning compressed air/water	35	psi (242 kPa)	maximum
Pressure	Radiator cleaning water/air pressure (maximum)	35	psi	cleaning radiator
Resistance	Battery charge threshold	1.215	specific gravity	charge battery if reading below this
Resistance	Coolant temperature sender	500 to 2k	ohms
Resistance	Fully charged battery corrected specific gravity	1.260	specific gravity	corrected; add four gravity points (0.004) per 10°F above 80° F (27° C)
Resistance	Governor gain potentiometer R1 (between C-01-21 and C-01-49)	1.4k	ohms	plug C-01 removed from CM570 module
Resistance	PMG stator resistance	2	ohms
Resistance	PMG stator resistance	6	ohms
Resistance	PT primary	1K-2.5K	ohms
Resistance	PT secondary	140-225	ohms
Resistance	PT/CT module 3-ohm resistors (J8-15 to 14, J8-22 to 23, J8-7 to 8)	3	ohms
Resistance	Winding resistance (Exciter stator 0.096; Exciter rotor 1.25; Main rotor winding 11 N/A; Main stator winding 12 0.0076; winding 17 N/A; winding 07 0.0104)	0.096 / 1.25 / N/A / 0.0076 / N/A / 0.0104	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.096; Exciter rotor 1.4; Main rotor winding 11 N/A; Main stator winding 12 0.0056; winding 17 N/A; winding 07 0.008)	0.096 / 1.4 / N/A / 0.0056 / N/A / 0.008	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.096; Exciter rotor 1.64; Main rotor winding 11 N/A; Main stator winding 12 0.0044; winding 17 N/A; winding 07 0.006)	0.096 / 1.64 / N/A / 0.0044 / N/A / 0.006	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.096; Exciter rotor 1.75; Main rotor winding 11 N/A; Main stator winding 12 0.0036; winding 17 N/A; winding 07 0.0044)	0.096 / 1.75 / N/A / 0.0036 / N/A / 0.0044	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.136; Exciter rotor 0.91; Main rotor winding 11 0.0085; Main stator winding 12 N/A; winding 17 0.0115; winding 07 N/A)	0.136 / 0.91 / 0.0085 / N/A / 0.0115 / N/A	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.136; Exciter rotor 1.04; Main rotor winding 11 0.007; Main stator winding 12 N/A; winding 17 0.01; winding 07 N/A)	0.136 / 1.04 / 0.007 / N/A / 0.01 / N/A	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.136; Exciter rotor 1.17; Main rotor winding 11 0.0055; Main stator winding 12 N/A; winding 17 0.0075; winding 07 N/A)	0.136 / 1.17 / 0.0055 / N/A / 0.0075 / N/A	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.136; Exciter rotor 1.35; Main rotor winding 11 0.005; Main stator winding 12 N/A; winding 17 0.0052; winding 07 N/A)	0.136 / 1.35 / 0.005 / N/A / 0.0052 / N/A	ohms	approximate, at 68 F (20 C) +10%
Resistance	Winding resistance (Exciter stator 0.158; Exciter rotor 1.44; Main rotor winding 11 0.0037; Main stator winding 12 0.0148; winding 17 N/A; winding 07 0.011)	0.158 / 1.44 / 0.0037 / 0.0148 / N/A / 0.011	ohms	approximate, at 68 F (20 C) +10%

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		Use a coolant solution as recommended in the Cummins engine Operation and Maintenance Manual		40.0 L	Balanced coolant mixture of water, antifreeze and coolant additives; drain and replace every year or after 500 hours; 10.5 Gal (40 L) printed; gensets shipped with coolant added
Engine oil		Refer to the Cummins engine Operation and Maintenance Manual for lubricating oil classification and recommendations/specifications		36.7 L	Gensets are shipped with oil added; check oil level before initial start; 9.7 Gal (36.7 L) printed
Fuel	ASTM No. 2 diesel fuel				Cummins engines normally use ASTM No. 2 diesel fuel. They will also operate on alternate diesel fuels within specifications shown in Cummins engine Operation and Maintenance Manual.
Fuel	Diesel fuel				Do not use zinc coated or copper fuel lines with diesel fuel. Fuel connection at engine should be made with an approved flexible line.
Grease	Lithium based grease, Mobilux No. 2 or Shell Alvania R3		-30°C to 120°C	2.74 oz. (81 ml)	Generator end bearing lubricant; -22F to +248F (-30C to +120C). Grease equally divided between bearing, bearing cap cavity, and bearing cartridge cavity.

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	Engine is operating in idle mode.	Info	Engine continues at 800 RPM; normal when idle input grounded in RUN mode.
102	EMERGENCY STOP	Local or remote Emergency Stop.	Shutdown	Reset only at PCC front panel: pull button out, switch to Off, press Reset.
200	LOW OIL PRESSURE	Engine oil pressure dropped to an unacceptable level.	Warning	If critical loads, wait until next shutdown period then follow 201; else follow 201.
201	LOW OIL PRESSURE	Engine oil pressure dropped below shutdown trip point.	Shutdown	Check oil level, lines and filters; replenish if low; reset and restart. Contact service center.
204	OIL PRES SENDER	Engine oil pressure sender not functioning correctly.	Warning	Check sender connection. Contact an authorized service center.
210	LOW COOLANT TEMP	Coolant temperature 70° F (21° C) or lower; coolant heater not operating or not circulating.	Warning	Check coolant heater power, low coolant level, and leakage points.
211	HIGH COOLANT TEMP	Engine has begun to overheat (215° F standby / 207° F primary).	Warning	Reduce load if possible; check air inlets/outlets and remove obstructions.
212	HIGH COOLANT TEMP	Engine overheated (above 223° F standby / 215° F primary) or coolant level low.	Shutdown	Allow to cool; check coolant level, airflow, fan belt. Reset and restart. Contact service center if unresolved.
213	COOLANT SENDER	Coolant temperature sender resistance out of range.	Warning	Contact an authorized service center.
214	LOW COOLANT LVL	Engine coolant level fell below trip point.	Warning	Allow to cool; check and replenish coolant; repair leaks; reset and restart.
215	LOW COOLANT LVL	Engine coolant level fell below trip point.	Shutdown	Allow to cool; check and replenish coolant; repair leaks; reset and restart.
220	MAG PICKUP	Mag pickup speed indication not sensed or does not match genset output frequency.	Shutdown	Restart and check RPM on display. Contact service center.
221	FAIL TO CRANK	Possible fault with control or starting system.	Shutdown	Check battery cable connections, recharge/replace battery. Contact service center for starter system.
222	OVERCRANK	Possible fuel system problem.	Shutdown	Check fuel tank, leaks, plugged fuel lines; replace dirty fuel or air filters. Reset and restart.
223	OVERSPEED	Engine exceeded normal operating speed (2070 rpm @ 60 Hz; 1800 rpm @ 50 Hz).	Shutdown	Contact an authorized service center.
230	LOW DC VOLTAGE	Battery voltage below 24 VDC.	Warning	Check battery charger fuse; recharge/replace battery; clean and tighten battery cable connections.
231	HIGH DC VOLTAGE	Battery voltage exceeds 32 VDC.	Warning	Contact an authorized service center.
232	WEAK BATTERY	Battery voltage drops below 60% of nominal for two seconds during starting.	Warning	See Warning message 230, LOW DC VOLTAGE.
240	LOW FUEL − DAY	Day tank fuel supply running low.	Warning	Check fuel supply and replenish as required.
241	LOW FUEL	Fuel supply running low.	Warning	Check fuel supply and replenish as required.
250	EEPROM ERROR	PCC memory error; data corruption of critical operating parameters.	Shutdown	Contact an authorized service center.
251	EEPROM ERROR	PCC memory error; data corruption of noncritical operating parameters.	Warning	Contact an authorized service center.
252	EEPROM ERROR	PCC memory error; data corruption of noncritical operating parameters.	Warning	Contact an authorized service center.
260	CUSTOMER FAULT 1	Customer defined input closed to ground; function programmable as shutdown or warning.		Contact an authorized service center. Message is editable.
261	GROUND FAULT	Customer defined input closed to ground; function programmable as shutdown or warning.		Contact an authorized service center. Message is editable.
262	CM570/ENGINE	Engine control module (CM570) not properly operating.	Warning	Contact an authorized service center.
263	CM570/ENGINE	Engine control module (CM570) not properly operating.	Shutdown	Contact an authorized service center.
301	HIGH AC VOLTAGE	One or more phase voltages exceeded 130% of nominal, or 110% of nominal for 10 seconds.	Shutdown	Contact an authorized service center.
303	LOW AC VOLTAGE	One or more phase voltages dropped below 85% of nominal for 10 seconds.	Shutdown	Contact an authorized service center.
313	UNDER FREQUENCY	Engine speed dropped below 90% of nominal for 10 seconds.	Shutdown	Load Dump signal initiated five seconds before shutdown. Contact an authorized service center.
320	OVERCURRENT	Generator output current exceeded 110% of rated for 60 seconds.	Warning	Contact an authorized service center.
321	OVERCURRENT	Output current exceeded 110% of rated; PCC time/current calculation initiated shutdown.	Shutdown	Contact an authorized service center.
322	SHORT CIRCUIT	Generator output current exceeded 175% of rated.	Shutdown	Contact an authorized service center.
330	OVERLOAD	Three-phase output exceeds 105% of standby (or 115% of prime) rating.	Warning	Load Dump activated after 5 seconds; OVERLOAD warning after 60 seconds. Contact an authorized service center.
335	REVERSE POWER	Improper CT or PT phasing (non-parallel units only).	Shutdown	Contact an authorized service center.

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

Procedures

Adjust Start and Stop Delays adjustment

Press the button next to the word ADJUST in the Main Menu. The VOLTAGE submenu will appear.
Press the button next to the '>>' to move through the VOLTAGE and FREQUENCY submenus to the START DELAY submenu.
Use the buttons next to the '⇑' and '⇓' symbols to set the start delay. The start delay adjustment range is 0 to 300 seconds.
From the START DELAY submenu, press the button next to the '>>' to move to the STOP DELAY submenu.
Use the buttons next to the '⇑' and '⇓' symbols to set the stop delay. The stop delay adjustment range is 0 to 600 seconds.
From the STOP DELAY submenu, press the button next to the '>>' to move to the SAVE/EXIT submenu. Select SAVE to save your changes.
At the CHANGES SAVED submenu, select EXIT to return to the Main menu.

Adjusting Start/Stop Delays (PCC Adjust Menu) adjustment

Press button next to ADJUST in Main Menu to display VOLTAGE submenu
Press button next to >> to move through FREQUENCY submenu to STOP DELAY submenu
Use buttons next to arrows to set start delay, range 0 to 300 seconds
Use buttons next to arrows to set stop delay, range 0 to 600 seconds
Press >> to move to SAVE/EXIT submenu and select SAVE to retain changes, then EXIT

Axial Alignment Procedure (Aligning Generator with Engine) adjustment

Tools: Dial indicator holding device with magnetic base or clamp

Fasten a dial indicator holding device to skid base, engine block, or generator shell.
Position the indicator sensor point on the generator shaft hub.
Bar the engine over in a clockwise rotation through a couple of rotations.
Record indicator readings in eight equally spaced points around the shaft diameter.
To correct out-of-tolerance T.I.R., remove drive disc capscrews and mark discs and flywheel.
Rotate engine or generator so drive disc holes are repositioned 180 degrees from original location.
Reinstall capscrews and retorque; recheck alignment.
If T.I.R. is unchanged, rotate discs 30, 60, or 90 degrees from original location.

Converting Day Tank Controller from 120 VAC to 240 VAC adjustment

Remove jumpers between TB1-5/TB1-6 and TB1-7/TB1-8; connect two jumpers between TB1-6 and TB1-7
Move selector switch S103 on control PCB to down position for 240 VAC
If equipped with transformer, remove jumpers between H1/H3 and H2/H4 and connect two jumpers between H2 and H3

Converting Day Tank Controller from 240 VAC to 120 VAC adjustment

Remove two jumpers between TB1-6 and TB1-7; connect one between TB1-5/TB1-6 and one between TB1-7/TB1-8
Move selector switch S103 on control PCB to up position for 120V
If equipped with transformer, remove jumpers between H2/H3 and connect H1/H3 and H2/H4

Voltage and Frequency Adjustment adjustment

⚠ Improper calibration or adjustment of the PowerCommand control can cause equipment malfunction or damage. Calibration and adjustment must be performed by technically qualified personnel only.

Tools: Calibrated RMS multimeter (Fluke 87 or 8060A)

With the genset OFF, attach a calibrated frequency/voltmeter to the AC output from L1 to L2.
Select ADJUST from the Main Menu to display the VOLTAGE adjust menu.
Start the genset and allow it to reach normal operating speed.
Adjust VOLTAGE so that the calibrated voltmeter reads the desired voltage.
Select the Frequency adjust menu and verify/adjust frequency to the desired value.
Select EXIT if no adjustment was made; if an adjustment was made, SAVE then EXIT.

Generator/PCC Control Isolation Procedure diagnostic

⚠ HAZARDOUS VOLTAGE. Touching uninsulated parts inside the control housing and power output boxes can result in severe personal injury or death.

⚠ This test involves unregulated excitation; make sure all loads are disconnected and all faults cleared.

Tools: True RMS meter, Jumper leads

Throw the line circuit breaker OFF and shut down the set.
Remove plug 10 from connector 10 of the voltage regulator output module (A37).
Prepare to measure output voltage across generator terminals while the set is running.
Connect jumpers from a 12 volt battery to X (Field +) 10-6 red and XX (Field -) 10-3 brown.
Check polarity again; opposed polarity makes this test inconclusive.
Start the set and connect the battery negative (-) to the XX lead.
Rated or higher balanced voltage indicates generator circuitry is probably okay.
If unbalanced, troubleshoot main stator first; if uniformly low, troubleshoot exciter and field circuits first.

Ground Fault Alarm Relay Test diagnostic

Verify that the N-G Fault Indicator on the GFR is not lit. If lit, it indicates that the bonding jumper circuit (neutral to ground) is open. If genset does not require bonding jumper, a bonding jumper
Move the control switch to the Run position.
Press the TEST switch on the ground fault relay.
Verify that the control panel warning message is displayed and the Fault Indicator (>I) on the GFR is lit.
Reset the control panel fault (this will also reset the ground fault relay).

Rupture Basin Leak Detect Switch Test diagnostic

Remove the pipe fitting/switch assembly from the rupture basin tank.
Move the O/Manual/Auto switch to the MANUAL position.
Activate leak detect switch (move float upward).
Check control display for Rupture Basin fault message.
If no indication of fault, repair defective circuit.
Apply thread sealant to pipe fitting and install switch assembly.

Testing the Float Switch Assembly diagnostic

Tools: Ohmmeter, Feeler gauge

Remove the fuel pump control cover, disconnect the wiring jack and unscrew the assembly from the top of the day tank.
With an ohmmeter, test for continuity between each pair of colored leads while holding the assembly vertical.
Replace the assembly if any switch is open (all readings should be zero).
Lift each float in turn to 1/8 inch (3 mm) below the C-clip stop and test for continuity.
Replace the assembly if any switch does not open (all readings should be infinity).
Use pipe thread sealant when replacing the assembly.

Testing the Ground Fault Relay diagnostic

Verify N-G Fault Indicator on GFR is not lit; install bonding jumper at facility service entrance if required
Move control switch to Run position
Press TEST switch on ground fault relay
Verify control panel warning message is displayed and Fault Indicator on GFR is lit
Reset the control panel fault, which also resets the ground fault relay

Testing the PMG diagnostic

⚠ HAZARDOUS VOLTAGE. Touching uninsulated parts inside the control housing and power output boxes can result in severe personal injury or death.

Tools: Wheatstone bridge or digital ohmmeter, Voltmeter

Disconnect plug J10 from the voltage regulator output stage module.
Start the engine at the set and let the speed stabilize.
Measure voltage across lead pairs J10-1 & J10-4, J10-4 & J10-5, and J10-5 & J10-1.
Voltage should be at least 150 VAC for 50 Hz sets and at least 180 VAC for 60 Hz sets.
Voltages should be approximately the same for each set of leads.
Stop the set and measure resistance across the same lead pairs.
Refer to Table 6-3 for resistance values and Generator Reassembly for frame size.

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

Phase	Connection	Leads	Notes
	3-pole ATS system grounding	generator neutral to ATS, not bonded to ground at generator
	4-pole ATS system grounding	grounding electrode conductor and bonding jumper connect generator neutral to ground
	Alarm Relay K14 contacts	TB1 (jumper wire required for K14 relay option)	3-pole double-throw, same ratings as run relays; energized by any genset warning or shutdown
	B+ Input (RUN signal)	Blue (A37 J7)	Voltage regulator output module A37 J7 wiring connections (control)
	CT21 (+) In	White (A36 J9)	PT/CT Board (A36) J9 wiring connections
	CT21 (common) In	Gray (A36 J9)	PT/CT Board (A36) J9 wiring connections
	CT22 (+) In	Grn/Ylw (A36 J9)	PT/CT Board (A36) J9 wiring connections
	CT22 (common) In	Black (A36 J9)	PT/CT Board (A36) J9 wiring connections
	CT23 (+) In	Purple (A36 J9)	PT/CT Board (A36) J9 wiring connections
	CT23 (common) In	Blue (A36 J9)	PT/CT Board (A36) J9 wiring connections
	Current Transformers CT21/CT22/CT23	U (A phase)/V (B phase)/W (C phase) load leads	dot on CT must face toward generator; dual secondaries, wire 1 to pin 1, wire 2/3 to pin 2 (high voltage gensets) or pin 3 (low voltage gensets)
	Gen. Common In	Brown (A36 J9)	PT/CT Board (A36) J9 wiring connections to AC harness
	Ground Input	Purple (A37 J7)	Voltage regulator output module A37 J7 wiring connections (control)
	Phase A PMG power	Green (A37 J10)	Voltage regulator output module A37 J10 wiring connections (power)
	Phase B PMG power	Yellow (A37 J10)	Voltage regulator output module A37 J10 wiring connections (power)
	Phase C PMG power	Orange (A37 J10)	Voltage regulator output module A37 J10 wiring connections (power)
	Regulator Drive (+) Input	Gray (A37 J7)	Voltage regulator output module A37 J7 wiring connections (control)
	Regulator Drive (-) Input	White (A37 J7)	Voltage regulator output module A37 J7 wiring connections (control)
	Run Relay K11/K12/K13 contacts	TB1	3-pole double-throw, rated 10A at 28VDC or 120VAC 80%PF, 6A at 240VAC 80%PF, 3A at 480/600VAC 80%PF; energized when genset receives start signal
	Start in	Grn/Yel (A37 J7)	Voltage regulator output module A37 J7 wiring connections (control)
	Start solenoid	Black (A37 J7)	Voltage regulator output module A37 J7 wiring connections (control)
	X (Field +) Output	Red (A37 J10)	Voltage regulator output module A37 J10 wiring connections (power); X = red wire of connector 10-6
	XX (Field -) Output	Brown (A37 J10)	Voltage regulator output module A37 J10 wiring connections (power); XX = brown wire of connector 10-3
A	CT1 - U load leads	CT1	Route the appropriate leads through each CT; dot must face toward the generator
A	Gen. A In	Yellow (A36 J9)	PT/CT Board (A36) J9 wiring connections to AC harness
B	CT2 - V load leads	CT2	Route the appropriate leads through each CT; dot must face toward the generator
B	Gen. B In	Orange (A36 J9)	PT/CT Board (A36) J9 wiring connections to AC harness
C	CT3 - W load leads	CT3	Route the appropriate leads through each CT; dot must face toward the generator
C	Gen. C In	Red (A36 J9)	PT/CT Board (A36) J9 wiring connections to AC harness

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

Which generators use the Cummins/Onan QSM11-G2 engine?

The Cummins/Onan QSM11-G2 powers 3 generator set(s), including Cummins/Onan 275DQAE, Cummins/Onan DQAF, Cummins/Onan DQAF-5630694.

What is a common problem with the Cummins/Onan QSM11-G2 engine?

A commonly reported issue on generators using the Cummins/Onan QSM11-G2 is: Engine cranks but does not start (OVERCRANK (222) message; while cranking, Run LED DS12 on the engine interface board (A31) is on). Cause: Restricted fuel supply due to: a. Fuel level below pickup tube in tank. Fix: Add fuel if low. Prime the fuel system.