The Cummins/Onan QSX15-G7 is a 15 L 6-cylinder turbocharged - charged air cooled engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the QSX15. It holds 22 L (5.8 gal) of oil and 24 L (6.3 gal) of coolant.
Also known as: Cummins QSX15-G7, QSX15 G-7
Part of the Cummins/Onan QSX15 engine family — 19 variants share parts & fitment.
| Oil capacity | 22.0 L |
|---|---|
| Coolant capacity | 24.0 L |
| Displacement | 15.0 L |
| Cylinders | 6 |
| Aspiration | Turbocharged - Charged Air Cooled |
| Rated speed | 1800 rpm |
How to read your Cummins/Onan engine serial & model number →
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Air cleaner | Check | 8 hr | X1; replace as necessary; refer to QSX15 engine manual | |
| All hardware (fittings, clamps, fasteners, etc.) | Check | 8 hr | Daily or After 8 Hrs | |
| Anti-freeze and DCA concentration | Check | 8 hr | X1; refer to QSX15 engine manual | |
| Battery charging system | Check | 8 hr | Daily or After 8 Hrs | |
| Coolant heater(s) | Check | 8 hr | Daily or After 8 Hrs | |
| Coolant level | Check | 8 hr | Daily or After 8 Hrs | |
| Drive belt | Check | 8 hr | X1; refer to Cummins QSX15 Series Engine Operation and Maintenance Manual for interval/procedure | |
| Engine oil level | Check | 8 hr | Daily or After 8 Hrs | |
| Fuel filter(s) | Drain | 8 hr | X1; refer to QSX15 engine manual | |
| General set inspection | Inspect | 8 hr | Daily or After 8 Hrs (X1); also Monthly/100 Hrs (X2). Check for oil, fuel, coolant, and exhaust system leaks; check exhaust audibly/visually with set running. | |
| Battery electrolyte level | Check | 100 hr | Monthly or After 100 Hrs | |
| Generator air outlet | Check | 100 hr | Monthly or After 100 Hrs | |
| Radiator hoses | Check | 100 hr | Monthly or After 100 Hrs; check for wear and cracks | |
| Oil and filter change (Generator Drive, 1500 rpm, 45 liter sump) | Change | 125 hr | 12 mo | fixed hour method, standby applications |
| Crankcase breather | Clean | 250 hr | 6 mo | X1; 6 Months or After 250 Hrs |
| Engine oil and filter | Replace | 250 hr | 6 mo | X1; 6 Months or After 250 Hrs; refer to QSX15 engine manual |
| Lubricating Oil and Filters | Change | 250 hr | 6 mo | |
| Oil and filter change (Generator Drive, 1800 rpm, 95 liter sump) | Change | 250 hr | 12 mo | fixed hour method, standby applications |
| Supplemental Coolant Additive (SCA) and Antifreeze Concentration | Check | 250 hr | 6 mo | |
| Water coolant filter | Replace | 250 hr | 6 mo | X1; 6 Months or After 250 Hrs |
| coolant leaks and coolant SCA concentration level | Check | 625 hr | 6 mo | Operate the engine and check |
| lubricating oil | Change | 625 hr | 6 mo | Change/Replace |
| lubricating oil filter | Replace | 625 hr | 6 mo | Change/Replace |
| Air Leaks, Air Intake and Exhaust Systems | Check | 1500 hr | 12 mo | |
| Cooling Fan Belt Tensioner | Check | 1500 hr | 12 mo | |
| Fuel Filter (Spin-On Type) | Replace | 1500 hr | 12 mo | |
| air cleaner restriction | Check | 1500 hr | 12 mo | |
| air compressor element | Replace | 1500 hr | 12 mo | |
| automatic belt tensioner | Inspect | 1500 hr | 12 mo | |
| coolant filter | Replace | 1500 hr | 12 mo | Change/Replace |
| engine wiring harness | Check | 1500 hr | 12 mo | |
| intake air and exhaust systems | Check | 1500 hr | 12 mo | Operate engine and check |
| valve clearance | Check | 2000 hr | B-Series (4BT3.3): valve clearance checks not required for 2000 hours, twice the industry standard | |
| crankcase breather tube | Clean | 3000 hr | 24 mo | |
| engine | Clean | 3000 hr | 24 mo | Steam-clean engine |
| engine hoses | Check | 6000 hr | 24 mo | Check all hose connections for leaks or deterioration |
| engine mounting bolts | Check | 6000 hr | 24 mo | |
| shutters and fan | Check | 3000 hr | 24 mo | |
| valves, injectors, and engine brakes | Adjust | 3000 hr | 24 mo | It is not necessary to adjust every 2 years per note 5 |
| vibration dampers | Check | 3000 hr | 24 mo |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | Exhaust pipe clearance from combustible wall or partition | 12 | inches (305 mm) | minimum |
| Clearance | Exhaust pipe clearance to combustible wall or partition | 305 | mm | |
| 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 | Fuel lines - minimum clearance from electrical wiring | 12.7 | mm | |
| Clearance | Fuel lines - minimum clearance from hot exhaust parts | 51 | mm | |
| Clearance | MPU installation gap adjustment | back out 1/4 turn after touching gear tooth | turn | |
| Clearance | Minimum clearance of fuel lines from electrical wiring | 12.7 | mm (1/2 inch) | |
| Clearance | Minimum clearance of fuel lines from hot exhaust parts | 51 | mm (2 inch) | |
| Clearance | Service/maintenance access clearance around generator set | 1 | meter | |
| Clearance | Vibration isolator base elevation difference | 0.25 | inch (6 mm) | shimmed or grouted within this of each other |
| Clearance | Vibration isolator nominal clearance (leveling bolt) | 0.25 | inch (6 mm) | minimum, or greater |
| Gap | Maximum air cleaner restriction | 6.2 (25.0) | kPa (in H2O) | |
| Other | Air starting motor minimum air pressure | 480 | kPa [70 PSI] | |
| Other | Battery specific gravity (fully charged) | 1.26 | specific gravity | at 80 F (27 C) |
| Other | Battery specific gravity state of charge 100% | 1.26 to 1.28 | specific gravity at 27°C [80°F] | |
| Other | CAN datalink main trunk maximum length | 40 | meters | no more than 30 devices |
| Other | CAN datalink stub maximum length | 1 | meter | stub from main trunk to each module |
| Other | CAN datalink transmission speed | 250 | KBaud | |
| Other | Compression ratio | 17.0:1 | ||
| Other | Drive belt tension new belt | 1110 | N [250 lbf] | 10 rib |
| Other | Drive belt tension new belt | 1330 | N [300 lbf] | 12 rib and 12 rib K section |
| Other | Drive belt tension new belt | 620 | N [140 lbf] | SAE belt sizes 0.380 in, 0.440 in, 1/2 in, 11/16 in, 3/4 in, 7/8 in, 4 rib, 5 rib |
| Other | Drive belt tension new belt | 710 | N [160 lbf] | 6 rib |
| Other | Drive belt tension new belt | 890 | N [200 lbf] | 8 rib |
| Other | Engine brake adjustment | 7.0 | mm [0.276 in] | cold (stabilized coolant temperature at 60°C [140°F] or below) |
| Other | Exhaust flow at rated load | 2900 | cfm (1370 L/s) | 1500 RPM |
| Other | Exhaust flow at rated load | 3200 | cfm (1510 L/s) | 1800 RPM |
| Other | Exhaust outlet size | 4 | in. NPD | |
| Other | Frequency regulation | Isochronous | ||
| Other | Low oil pressure adequate within | 15 | seconds | after starting |
| Other | Mounting bolt size securing bedframe to base | 16 | mm | |
| Other | Mounting bolts | 5/8 inch or 16 mm | inch / mm | anchored mounting bolts |
| Other | Over current warning threshold | 110 | % of rated | |
| Other | Short circuit shutdown threshold | 175 | % of rated current | |
| Other | Starting motor engagement limit | 30 | seconds | do not engage starting motor longer; wait 2 minutes between attempts |
| Other | Voltage regulation, no load to full load | ± 0.5 | % | |
| Pressure | BMEP at rated load (standby) | 353.0 | psi (2433.9 kPa) | standby rating |
| Pressure | BMEP at set rated load | 2433.9 (353.0) | kPa (psi) | standby rating |
| Pressure | Fuel transfer pump maximum inlet restriction capability | 16 | inch Hg | approximately equivalent to 20 feet of diesel |
| Pressure | Max allowable exhaust back pressure | 76 | mmHg (3 in.) | |
| Pressure | Max fuel inlet restriction | 5 | in. Hg (127 mmHg) | |
| Pressure | Max fuel return restriction | 6.5 | in. Hg (165 mmHg) | |
| Pressure | Max. fuel inlet pressure | 10 | PSI (69 kPa) | |
| Pressure | Max. fuel inlet restriction | 5 | in. Hg. (16.9 kPa) | |
| Pressure | Max. fuel return restriction | 3.05 | in. Hg. (10.3 kPa) | |
| Pressure | Max. static restriction (cooling air) | 0.5 | in. H2O (124.5 Pa) | standby and prime |
| Pressure | Maximum air cleaner restriction | 25.0 | in. H2O (6.2 kPa) | |
| Pressure | Maximum allowable exhaust back pressure | 27 in (686 mm) H2O / 6.8 kPa / 2.0 in (51 mm) Hg | in H2O / kPa / in Hg | |
| Pressure | Maximum allowable exhaust back pressure created by piping and silencer | 51 mm Hg [2 in Hg] / 682 mm H2O [27 in H2O] | mm Hg / mm H2O | power generation |
| Pressure | Maximum allowable exhaust back pressure created by piping and silencer | 76 mm Hg [3 in Hg] / 1016 mm H2O [40 in H2O] | mm Hg / mm H2O | industrial |
| Pressure | Maximum allowable fuel return line restriction | 229 | mm Hg [9.0 in Hg] | |
| Pressure | Maximum allowable pressure drop across charge air cooler | 14 kPa [2 psi] / 102 mm Hg [4 in Hg] | kPa / mm Hg | industrial |
| Pressure | Maximum allowable pressure drop from turbo outlet to intake manifold | 14 kPa [2 psi] / 102 mm Hg [4 in Hg] | kPa / mm Hg | power generation |
| Pressure | Maximum allowable restriction to pump with clean filter | 203 | mm Hg [8 in Hg] | |
| Pressure | Maximum allowable restriction to pump with dirty filter | 305 | mm Hg [12 in Hg] | |
| Pressure | Maximum back pressure | 10.2 (41.0) | kPa (in H2O) | |
| Pressure | Maximum coolant pressure | 227 | kPa [33 psi] | exclusive of pressure cap - closed thermostat at maximum no-load governed speed |
| Pressure | Maximum exhaust back pressure | 41.0 | in. H2O (10.2 kPa) | |
| Pressure | Maximum fuel inlet restriction | 5.0 | in. Hg (127.0 mm Hg) | at rated load |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | Fully formulated antifreeze/coolant | TMC RP329 (ethylene glycol) or TMC RP330 (propylene glycol) | 24.0 L | 50/50 mixture with quality water; engine only coolant capacity 24 liters [25 qt]. Drain and flush after 6000 hours or 3 years. | |
| Coolant | 50/50 ethylene glycol antifreeze and water (0 to -32C); 60/40 ethylene glycol/water (-32 to -54C) | TMC RP329 (ethylene glycol) or RP330 (propylene glycol) | 54°C to 0°C | 50/50 mixture gives -36C [-34F] freezing point and 110C [228F] boiling point; do not use low-silicate antifreeze meeting ASTM D4985 for extended service intervals | |
| Engine oil | 15W-40 | CES 20,076 (or CES 20071; API CH-4 alternative) | Synthetic engine oils API category III recommended for ambient temperatures consistently below -25°C [-13°F]; 0W-30 oils where ambient never exceeds 0°C [32°F]; arctic operation use synthetic CF-4/SG or CG-4/SH 5W-30 below -23°C [-10°F]. | ||
| Engine oil | 15W-40 (recommended); 10W-30 or 5W-30 for temperate/cold; synthetic 0W-30 API category III below -25C | CES 20071 or CES 20076 (or API CH-4); API CG-4 at reduced drain interval | Do not use API CC/CD/CE/CF (obsoleted) | ||
| Fuel | ASTM No. 2 D diesel fuel; blends of No. 2 D and No. 1 D below 0°C [32°F] | Viscosity must be kept above 1.3 cSt at 100°C [212°F] to provide adequate fuel system lubrication. | |||
| Fuel | ASTM No. 2 diesel | Cummins engines normally use ASTM No. 2 diesel fuel; will operate on alternate diesel fuels within specifications in the Cummins engine Operation and Maintenance Manual. | |||
| Fuel | Diesel | Viscosity 1.3-4.1 cSt at 40C (ASTM D445); Cetane 40 min above 0C, 45 min below 0C (ASTM D613); Sulfur not to exceed 0.05 mass% (0.0015% for aftertreatment engines) | Cloud point 6C [10F] below lowest ambient operating temperature | ||
| Fuel | Diesel fuel specified to ASTM No. 2 or BS EN 590:2000, Automotive fuels | ASTM No. 2 / BS EN 590:2000 | An electric solenoid valve in the supply line is recommended for all installations and required for indoor automatic or remote starting installations. Never use galvanized or copper fuel lines, fittings or fuel tanks. | ||
| Fuel | diesel | ASTM No. 2 or BS EN 590:2000 | Cummins engines normally use a diesel fuel specified to ASTM No. 2 or BS EN 590:2000; alternate diesel fuels within the specifications shown in the Generator Set Operator Manual (0908-0219) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 27 | Low AC voltage shutdown | Voltage on any phase has dropped below a preset value; adjustable 50-95% of reference, delay 2-20 seconds; default 85% for 10 seconds | Shutdown | Genset shut down on low AC output voltage |
| 32 | Reverse power shutdown | Adjustment range 5-20% of standby kW rating, delay 1-15 seconds; default 10%, 3 seconds | Shutdown | Genset shut down on reverse power |
| 59 | High AC voltage shutdown | Output voltage on any phase exceeds preset values; adjustable 105-125% of nominal, time delay 0.1-10 seconds; default 110% for 10 seconds | Shutdown | Genset shut down on high AC output voltage |
| 81 o | Over frequency shutdown/warning | Generator set is operating at a potentially damaging frequency level; 2-10 Hz above nominal, 1-20 second delay; default 6 Hz, 20 seconds, disabled | Shutdown | Shutdown/warning on over frequency |
| 81 u | Under frequency shutdown | Generator set output frequency cannot be maintained; 2-10 Hz below reference, 5-20 second delay; default 6 Hz, 10 seconds | Shutdown | Genset shut down on under frequency |
| 135 | Oil Pressure Sensor High | Engine oil pressure sensor is shorted high | Warning | Verify fault simulation not enabled (InPower); inspect sensor and engine harness connector pins; use oil pressure sensor simulator to check control response, replace sensor if it responds; check P7-13, 17, 21 for short (>200k ohms OK) and open (10 ohms or less OK) |
| 141 | Oil Pressure Sensor Low | Engine oil pressure sensor is shorted low | Warning | Verify fault simulation not enabled; inspect sensor/harness connector pins; use simulator to check control response; check P7-13, 17, 21 short/open |
| 143 | Pre-Low Oil Pressure | Engine oil pressure dropped below the low oil pressure warning threshold | Warning | Verify fault simulation not enabled; check oil level, lines and filters; use oil pressure sensor simulator; check +5 VDC at sensor (E1-A) and at P7-21; use simulator to P7-13 (OP OUT) and P7-17 (OP COMM); isolate to harness or base board |
| 144 | Coolant Temperature Sensor High | Coolant temperature sensor signal is shorted high | Warning | Verify fault simulation not enabled; inspect sensor/harness pins; use resistive sensor simulator, replace sensor if control responds; check P7-30 (IH20) and P7-34 (IH20 COM) for short to ground and pin-to-pin (>200k ohms OK); compare sensor resistance between pins |
| 145 | Coolant Temperature Sensor Low | Coolant temperature sensor signal is shorted low | Warning | Verify fault simulation not enabled; inspect sensor/harness pins; use resistive sensor simulator; check P7-30 and P7-34 for short circuits and compare resistance |
| 146 | Pre-High Coolant Temperature | Engine coolant temperature exceeded the warning threshold for pre-high/high coolant temperature | Warning | Verify fault simulation not enabled; isolate to engine or sensor circuitry, check sensor accuracy with thermocouple; use coolant temperature sensor simulator; check P7-30 and P7-34 for short circuits and compare resistance |
| 151 | High Coolant Temperature | Engine coolant temperature exceeded the warning threshold for pre-high/high coolant temperature | Warning | Verify fault simulation not enabled; isolate to engine or sensor circuitry; check sensor accuracy with thermocouple; use coolant temperature sensor simulator; check P7-30 and P7-34 short circuits and compare resistance |
| 197 | Low Coolant Level | Engine coolant level dropped below the low coolant level warning threshold (optional) | Warning | Check and replenish coolant in radiator; if normal, isolate low coolant signal (GND); disconnect signal lead at sender and reset control, replace sender if message clears; check continuity from P7-32 to ground and replace harness if continuity exists |
| 234 | Overspeed | Engine speed signal indicates engine speed greater than the shutdown threshold | Shutdown | Cold engine: clear fault and restart; large block load removal: clear and restart; verify fault simulation not enabled; reset threshold via InPower; monitor engine RPM; check electronic governor actuator for binding |
| 235 | Low Coolant Level | Engine coolant level dropped below the low coolant level shutdown threshold | Shutdown | Refer to fault code 197 |
| 359 | Fail to Start (3.3L Electronic Governed Engine) | Engine failed to start after expiration of the last crank time | Shutdown | Check/restricted fuel supply: add fuel and prime, open shutoff valve, bleed air; check injection pump actuator and governor: check P7-24 (ACT+) and P7-28 (ACT-) continuity, measure actuator resistance (2.3 ohms OK), check CNTL B+ and GOV PWM signal, replace actuator if open/short/binding |
| 379 | Over Current (Battery Charger) | Charger output current is too high | Warning | Cycle through Setup menus to try to clear the fault; if the fault returns the charger control may have failed. Clear by disconnecting the charger harness plug, cycling completely through the setup menus, or recycling power |
| 415 | Low Oil Pressure | Engine oil pressure dropped below the low oil pressure shutdown threshold | Shutdown | Refer to fault code 143 |
| 427 | CAN Datalink Lost Message | Important data was lost between the Base Board and the ECM, or keyswitch to ECM was removed during genset operation | Warning | Reset control by pressing Fault Reset button with O/Manual/Auto switch in O (off); inspect Datalink harness between P10 and P41; check lead P10-1 to P41-N and P10-2 to P41-P (10 ohms or less = ok); measure terminating resistors (60 ohms = ok) |
| 441 | Low Battery Voltage | Low battery voltage has been detected | Warning | Clean/tighten battery connectors; replenish electrolyte and recharge; recharge/replace battery; verify battery voltage (12 or 24 VDC) matches calibration; adjust charge rate; replace engine DC alternator if normal charging voltage (12 to 14 or 24 to 26 VDC) not obtained; check harness P7-3/P7-7 and P7-4/P7-8 |
| 442 | High Battery Voltage | High battery voltage has been detected | Warning | Adjust charge rate per manufacturer; replace engine DC alternator if normal charging voltage not obtained; verify battery voltage (12 or 24 VDC) matches calibration |
| 781 | CAN Datalink Lost Messages | Important data was lost between the Base board and the ECM, or keyswitch to ECM was removed during genset operation | Warning | Refer to fault code 427 |
| 1123 | Shutdown After Battle Short | A shutdown fault occurred while Battle Short was enabled and Battle Short transitioned from enabled to disabled | Warning | Review the Fault History and perform corrective action |
| 1124 | Delayed Shutdown | Provides advanced warning of an impending generator set shutdown to loads which cannot handle sudden power loss | Warning | A shutdown fault is present; review fault history |
| 1131 | Battle Short Active | Battle short mode has been activated | Warning | Battle short function enabled |
| 1245 | CAN - Engine Shutdown | The PCC received a shutdown message from the ECM | Shutdown | Refer to the E-Controls service tool and the engine service manual |
| 1246 | CAN - Unknown Engine Fault | The PCC received an unknown message from the ECM | Warning | Refer to the E-Controls service tool and the engine service manual |
| 1247 | CAN - Engine Unannounced Fault | The PCC received an unknown message from the ECM | Warning | Refer to the E-Controls service tool and the engine service manual |
| 1248 | CAN - Engine Warning Fault | The PCC received an unknown message from the ECM | Warning | Refer to the E-Controls service tool and the engine service manual |
| 1311, 1312, 1317, 1318 | Customer Input | Nature of the fault is an optional customer selection | Disconnect signal lead from TB1 (CUST_IN1 TB1-4, CUST_IN2 TB1-5, CUST_IN3 TB1-6, CUST_IN4 TB1-7) and reset the control; if the message clears, external wiring has a short/open or the active input selection (closed/open) is not correct | |
| 1313-1316 | Network Fault 1 Through 4 | Indicates network input (#1-#4) is in an active state | Each fault function can be programmed (using the service tool) as Status, Warning, or Shutdown; change display name using up to 19 characters | |
| 1334 | Crit Scaler OR | An incorrect feature or calibration was entered into the control | Shutdown | Correct the feature/calibration entered into the control |
| 1335 | Non-Crit Scaler OR | An incorrect feature or calibration was entered into the control | Warning | Correct the feature/calibration entered into the control |
| 1416 | Fail to Shutdown | A shutdown fault was bypassed while the PowerCommand controller was in Battle Short mode | Warning | Review the fault history record |
| 1417 | Power Down Failure | The control has failed to go to sleep | Warning | Possible base board fault |
| 1433 | Emergency Stop | Indicates a local Emergency Stop | Shutdown | Pull the Emergency stop button out; move the O/Manual/Auto switch to O; press the front panel Fault Acknowledge/Reset button; select Manual or Auto as required |
| 1434 | Remote Emergency Stop | The Remote Emergency Stop has been activated | Shutdown | Check for activated Remote Emergency stop button; check for faulty connection or faulty emergency stop switch |
| 1435 | Engine Cold | Initiates a warning when the engine jacket water coolant temperature falls below 70 degrees F (21 degrees C). Provided with illumination of the Warning LED to meet NFPA 110 requirements. | Warning | Check the coolant heaters for proper operation. If operating properly, other precautions may be necessary to warm the engine before applying a load. |
| 1442 | Weak Battery | Battery voltage sensed by the alternator control dropped below the Weak Battery Voltage threshold for the set time | Warning | Refer to Fault Code 441 |
| 1443 | Battery Failed | Dead battery - engine will not start | Shutdown | Refer to Fault Code 441 |
| 1444 | kW Overload | The Overload Warning Threshold was exceeded for the registered Overload Warning Set Time | Warning | Reset threshold to highest allowable; check load and load cables for short/overload; check CTs and CT connections; check continuity from P7 to CTs (P7-11/P7-12 CT1, P7-15/P7-16 CT2, P7-19/P7-20 CT3) |
| 1445 | Short Circuit | Alternator output current exceeded 175% of rated current | Shutdown | Inspect load and load cables for damage/short; verify CT connections to J12-1 through J12-6; ensure controller set for correct CT ratio |
| 1446 | High AC Voltage | One or more phase voltages exceeded the High AC Voltage Threshold percentage for the High AC Voltage Delay | Shutdown | Verify fault simulation not enabled; clear fault following large block load removal; reset threshold to highest allowable; follow Generator/Base Board Isolation Procedure in alternator service manual |
| 1447 | Low AC Voltage | One or more phase voltages decreased below the Low AC Voltage Threshold for the Low AC Voltage Delay | Shutdown | Verify fault simulation not enabled; reset Low AC Voltage Threshold; check for overload; inspect PT connections (L1 J22-1, L2 J22-2, L3 J22-3, LN J22-4) and PT ratio; check AVR power supply and fuses at J18-1/J18-2 (10 Amp); measure AVR Powerstage output at J17-1/J17-2; check PMG voltages/resistances; check rotating rectifier diodes |
| 1448 | Under Frequency | Frequency dropped below the Underfrequency Threshold for the Underfrequency Delay | Shutdown | Verify fault simulation not enabled; reset threshold to lowest allowable; check/correct overload; check fuel or air supply; repair loose connector (P8) |
| 1449 | Over Frequency | Frequency exceeded the Overfrequency Threshold for the Overfrequency Delay | Warning | Ensure Overfrequency Enable not enabled; configure Overfrequency Threshold; verify frequency to speed gain (120/number of poles); check crankshaft/camshaft speed sensor connections and clearance; check sensor supply (4.75-5.25 VDC pins 16/37) and signal (0.46-4.56 VDC pins 27/26); check harness resistance (5 ohms or less); check for air in fuel system |
| 1461 | Loss of Field | Loss of field (electric) due to reverse kVAR | Shutdown | Investigate loss of field condition |
| 1466 | Modem Failure | The control cannot communicate with the modem | Warning | Check for an open short circuit to ground and loose connections to the modem |
| 1468 | Network Error | Momentary loss of communication from the LonWorks network | Warning | Refer to the LonWorks network publications for troubleshooting methods |
| 1469 | Speed/Hz Match | Measured speed and measured AC output frequency do not agree | Shutdown | Check the calibration file |
| 1471 | Over Current | Generator set output exceeded 110% of rated | Warning | Refer to Fault Code 1444 |
| 1472 | Over Current | Generator output current exceeded 110% of rated and a control time/current calculation initiated an overcurrent shutdown | Shutdown | Check the load and load lead connections (the fault may not reset for several minutes) |
| 2331 | Low AC Voltage (Battery Charger) | AC input voltage is more than 10% below nominal rated voltage | Warning | Check level of input voltage; charger will not operate with voltage 10% or more below nominal |
| 2335 | Excitation Fault | The control detected simultaneous loss of all phase sensing | Shutdown | Check parameters configuration and wiring |
| 2336 | Memory Error | Control memory error resulting in data corruption of critical operating parameters | Shutdown | Try reloading the calibration file |
| 2341 | High Control Temperature | Control temperature is above normal (158 F [70 C]) for longer than the control temperature set time | Warning | Check the generator set room air flow |
| 2342 | Too Long in Idle | Engine running at idle speed longer than the Maximum Idle Time parameter | Warning | Check Maximum Idle Time parameters; check coolant heater(s); avoid idling more than 20 minutes |
| 2358 | High AC Voltage (Battery Charger) | AC input voltage is more than 10% above nominal rated voltage | Warning | Check level of input voltage; charger will not operate with voltage 10% or more above nominal |
| 2967 | Governor Fault | Governor hardware drive circuitry contains a fault condition | Warning | Investigate governor hardware drive circuitry |
| 2968 | AVR Fault | AVR hardware contains a fault condition | Warning | Investigate AVR hardware |
| 2969 | LON Failure | No communications with the LonWorks board | Warning | Investigate LonWorks board communication |
| 2972 | Field Overload | Field AVR Duty Cycle operating at maximum output longer than the Max Field Time parameter | Shutdown | Check Max Field Time Delay parameter; check voltage sensing into base board for low voltage or open/short circuit; check alternator or application issue |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
⚠ To get maximum brake operating efficiency and to prevent engine damage, follow instructions in this section.
Tools: 3163530 Brake Feeler Gauge - 7.00 mm [0.276 in]
⚠ Do not use fan blade to bar over the engine; that can damage blades and cause property damage and personal injury.
Tools: Ohmmeter
⚠ Do not use solvent to clean rocker cover gasket.
⚠ Batteries can emit explosive gases. Disconnect battery before service.
Tools: 3375044 Torque Wrench, Feeler gauge
⚠ Accidental starting can cause severe personal injury or death; disconnect negative (-) battery cable with insulated wrench.
⚠ Set generator set to off mode before disconnecting/connecting harness connectors.
Tools: True RMS meter, Insulated wrench, Jumper leads
⚠ Do not remove pressure cap from a hot engine; wait until coolant is below 50C [120F].
Tools: CC2602 Coolant Test Kit
Tools: Ohmmeter, Feeler gauge
⚠ Accidental starting of the generator set can cause severe personal injury or death. Prevent accidental starting by disconnecting the negative (–) cable from the battery terminal.
⚠ Improper wiring can cause a fire or electrical hazard.
⚠ Backfeed to utility system can cause electrocution or property damage. Do not connect to any building electrical system except through an approved device.
⚠ Ignition of explosive battery gases can cause severe personal injury or death. Always connect negative (–) battery cable last to prevent arcing.
⚠ Ventilate battery area before working on or near battery.
⚠ The coolant heater must not be operated while the cooling system is empty or damage to the heater will occur.
⚠ Hazardous voltage! Ensure all power is off before performing control wire installation.
⚠ Always run control circuit wiring in separate metal conduit from AC power cables.
Tools: cable ties, flexible conduit
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| U, V, W, N terminals (U,V,W = L1,L2,L3; N = L0) | Stranded load wires bolted to generator reconnection terminal block or circuit breaker lugs | Generators can be configured to the nameplate voltages as shown on the Reconnection Diagram decal attached to the backside of the control box cover; many voltages require reconfiguration of the generator output leads. | ||
| 110/190 | 3 | 12 | Full load current at Standby rating: 1901 A | |
| 110/220 | 3 | 12 | Full load current at Standby rating: 1642 A | |
| 115/230 | 3 | 12 | Full load current at Standby rating: 1571 A | |
| 120/208 | 3 | 12 | Full load current at Standby rating: 1737 A | |
| 139/240 | 3 | 12 | Full load current at Standby rating: 1505 A | |
| 220/380 | 3 | 12 | Full load current at Standby rating: 951 A | |
| 230/400 | 3 | 12 | Full load current at Standby rating: 903 A | |
| 240/416 | 3 | 12 | Full load current at Standby rating: 868 A | |
| 255/440 | 3 | 12 | Full load current at Standby rating: 821 A | |
| 277/480 | 3 | Wye, 4 Wire | 12 | Full load current at Standby rating: 753 A |
| 347/600 | 3 | 12 | Full load current at Standby rating: 602 A |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Part # | Description | Category |
|---|---|---|
| AF25544 | Element, Primary - Air Cleaner - Fleetguard - Heavy Duty | Air filter |
| AF25545 | Element, Safety - Air Cleaner - Fleetguard - Heavy Duty | Air filter |
| 0908-0101 | Lead Acid Battery | Battery |
| 3375044 | Torque Wrench | Belt |
| 19802521 | ECM Dataplate | ECM / ECU |
| 3331096 | Cummins, Part No. 3331096 | Fuel filter |
| 3376807 | Fuel filter | Fuel filter |
| FS1007 | Fleetguard® Nelson®, Part No. FS1007 | Fuel filter |
| M-4376220 | Juego Junta Superior N. ° de Pieza | Gasket |
| M-4376221 | Juego Junta Inferior N. ° de Pieza | Gasket |
| 3375049 | Oil Filter Wrench | Oil filter |
| 3406810 | Combination Full-Flow/Bypass Lubricating Oil Filter Cummins Part No. 3406810 | Oil filter |
| 0908-0203 | Operator manual | Operator manual |
| 0908-0204 | Operator manual | Operator manual |
| 0908-0230 | Generator Set Operator Manual | Operator manual |
| 0179-3536 | Coolant heater (Revision E) | Service part / kit |
| 0402-0222 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit |
| 0402-0234 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit |
| 0402-0246 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit |
| 0402-0427 | Vibration isolator (non-seismic rated, does not carry IBC/OSHPD certification) | Service part / kit |
| 0908-0107 | Radiator Information | Service part / kit |
| 0908-0110 | Health and Safety (Diesel Generator Sets) | Service part / kit |
| 0908-0219 | Alarm Module (option) | Service part / kit |
| 17200015 | Engine Shutdown | Service part / kit |
| 17690172 | Engine Braking System | Service part / kit |
| 17800006 | Engine Model | Service part / kit |
| 3163156 | Service cable for InPower™ | Service part / kit |
| 3822735 | Plastic bead blasting media | Service part / kit |
| 3886301 | InPower™ electronic service tool | Service part / kit |
| A035H139 | Switch, Pushbutton | Service part / kit |
| A040U808 | Harness, Control − Door (Includes Items 30 & 31) | Service part / kit |
| A046Y204 | Shield, Wiring | Service part / kit |
| CC2609 | Fleetguard Water-Check H2O 3-Way Test Strips | Service part / kit |
| M-3685996 | Intake Valve | Service part / kit |
| M-5473065 | 150mm Kit de Motor M-5473066 | Service part / kit |
| M-5473069 | 152mm Kit de Motor M-5473070 | Service part / kit |
| M-5473074 | Kit de Motor M-5473075 | Service part / kit |
| TB3-5 | Generator Set Control Panel Terminal Block | Service part / kit |
| TB3-6 | Generator Set Control Panel Terminal Block | Service part / kit |
| ol204vt | Torque Peak | Service part / kit |
| M-5473087 | Piston Kit | Piston kit |
| M-5484414 | Piston Pin | Piston pin |
| M-3686661 | Valvula de escape - M-3686661 | Valve |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Cummins/Onan QSX15-G7 engine has an oil capacity of 22.0 liters.
The Cummins/Onan QSX15-G7 has a displacement of 15.0 liters with 6 cylinders.
The Cummins/Onan QSX15-G7 powers 1 generator set(s), including Cummins/Onan QSX15.