The Cummins/Onan QST30-G2 is a 30.5 L 12-cylinder turbocharged and aftercooled engine rated at 1800 rpm, producing up to 895.2 kW. It powers generator sets from Cummins/Onan and Katolight, including the 700DFHB, 800DFHB, DFHA and DFHB. It holds 140 L (37.0 gal) of oil and 85 L (22.5 gal) of coolant.
Also known as: QST30-G2, Cummins QST30-G2
Part of the Cummins/Onan QST30 engine family — 7 variants share parts & fitment.
| Oil capacity | 140.0 L |
|---|---|
| Coolant capacity | 85.0 L |
| Displacement | 30.5 L |
| Cylinders | 12 |
| Aspiration | turbocharged and aftercooled |
| Rated speed | 1800 rpm |
| Gross power | 895 kW |
Shared across brands: Cummins/Onan, Katolight
This engine also powers 196 machine(s) on Power Equipment Info.
How to read your Cummins/Onan engine serial & model number →
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QST30-G2.
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Cleaner: Maximum Air Cleaner Restriction, 25.0 in. H2O (6.2 kPa) | — | |||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | Battery Capacity: 1280 amps minimum at ambient temperature of 32°F (0°C) | — | |||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | Lube Oil Filter Types: Four spin-on, full flow; two bypass oil filters | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Crankcase Oil and Filter | Change | 250 hr | 12 mo | Footnote X6: If genset is used for standby applications, change oil every 12 months or 250 hours, whichever comes first |
| Rupture basin leak detect switch | Test | 12 mo | In some areas, weekly inspections may be required by safety code regulations. |
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 | Actuator maximum range | 0 - 21 | mm | |
| Clearance | Actuator position fault threshold | 1.5 | mm | more than commanded position |
| Clearance | Exhaust pipe clearance from combustible wall or partition | 12 | inches (305 mm) | |
| Clearance | Fuel line minimum clearance from electrical wiring | 1/2 | inch (12.7 mm) | |
| Clearance | Fuel line minimum clearance from hot exhaust parts | 2 | inch (51 mm) | |
| Clearance | Fuel rack position range | 0 - 21 | mm | |
| Clearance | Generator/engine angular alignment T.I.R. (max) | .001 | inch per inch of radius (center of shaft to indicator axis) | dial indicator at bolt circle diameter |
| Clearance | Left/right actuator fault threshold (more than this from commanded position) | 1.5 | mm | |
| Clearance | Vibration isolator base elevation difference (max) | 0.25 | inch (6 mm) | shimmed or grouted, flat and level surface |
| Clearance | Vibration isolator top plate clearance (nominal) | 0.25 | inch (6 mm) | level, genset installed |
| Gap | Fuel rack travel (rack test) | 0 to 19 | mm | rack test |
| Gap | Governor actuator position fault threshold | more than 1.5 from commanded position | mm (actuator range 0-21 mm) | |
| Other | Battery electrolyte specific gravity (charge threshold) | 1.215 | charge battery if below this reading | |
| Other | Battery electrolyte specific gravity (fully charged) | 1.260 | corrected to 80°F (27°C) | |
| Other | Bearing grease quantity | 81 | ml | |
| Other | Engine torque adjustment range | 0% to +1% | duty cycle units | approximately 0% to +2% engine horsepower |
| Other | Generator insulation resistance (frame HC6) | 5.0 - 1.0 | MEG | 500 VDC megger setting |
| Other | Generator insulation resistance (frame P7) | 10.0 - 1.0 | MEG | 500 VDC megger setting |
| Other | Governor duty cycle range | 25 - 93 | % | |
| Other | Polarization Index (PI) acceptance ratio | 2 or greater | ratio (10 min megohms / 1 min megohms) | new and in-service sets |
| Other | Rack position test voltage (disconnect fuel pump) | 1.3 ±.25 to 4.5 ±.25 | VDC | racks moved to 0mm |
| Other | Rack test position range | 0 to 19 | mm | |
| Other | Start delay adjustment range | 0 to 300 | seconds | |
| Other | Start delay adjustment range (Auto mode remote start) | 0 to 300 | seconds | |
| Other | Stop delay adjustment range | 0 to 600 | seconds | |
| Other | Stop delay adjustment range (Auto mode remote stop) | 0 to 600 | seconds | |
| Other | Torque adjustment range | 0% to +1% | % duty cycle | |
| Other | Voltage regulator PWM duty cycle range | 0 - 60 | % | |
| Other | Wrist strap resistance | approximately 1 | megohm | |
| Pressure | Engine oil pressure - idle | 20 | psi | idle mode |
| Pressure | Engine oil pressure - idle mode shutdown limit | 10 | psi | idle mode |
| Pressure | Engine oil pressure - idle mode warning limit | 15 | psi | idle mode |
| Pressure | Engine oil pressure - normal | 45-65 | psi | run mode |
| Pressure | Engine oil pressure - run mode shutdown limit | 35 | psi | run mode |
| Pressure | Engine oil pressure - run mode warning limit | 40 | psi | run mode |
| Pressure | Idle oil pressure | 20 | psi (138 kPa) | idle |
| Pressure | Idle oil pressure shutdown limit | 10 | psi (69 kPa) | idle |
| Pressure | Idle oil pressure warning limit | 15 | psi (103 kPa) | idle |
| Pressure | Maximum allowable exhaust back pressure | 27 | in. H2O (6.7 kPa) | |
| Pressure | Maximum allowable exhaust back pressure | 41 | in. H2O (10.2 kPa) | |
| Pressure | Maximum compressed air pressure for cleaning air filter element | 30 | psi (207 kPa) | air cleaner element cleaning |
| Pressure | Maximum compressed air pressure for cleaning radiator | 35 | psi (242 kPa) | radiator cleaning |
| Pressure | Maximum fuel inlet pressure | 10 | PSI (69 kPa) | |
| Pressure | Maximum fuel inlet restriction | 4 | in. Hg. (13.5 kPa) | |
| Pressure | Maximum fuel return restriction | 10 | in. Hg. (33.8 kPa) | |
| Pressure | Maximum fuel return restriction | 20 | in. Hg. (67.6 kPa) | |
| Pressure | Normal oil pressure | 45-65 | psi (310-448 kPa) | normal operating |
| Pressure | Oil pressure idle - QST30 engine | 20 | psi (138 kPa) | idle |
| Pressure | Oil pressure normal - QST30 engine | 45-65 | psi (310-448 kPa) | normal |
| Pressure | Oil pressure shutdown limit | 10 | psi (69 kPa) | idle mode |
| Pressure | Oil pressure shutdown limit | 35 | psi (241 kPa) | run mode |
| Pressure | Oil pressure shutdown limit - idle mode | 10 | psi | |
| Pressure | Oil pressure shutdown limit - run mode | 35 | psi | |
| Pressure | Oil pressure warning limit | 15 | psi (103 kPa) | idle mode |
| Pressure | Oil pressure warning limit | 40 | psi (276 kPa) | run mode |
| Pressure | Oil pressure warning limit - idle mode | 15 | psi | |
| Pressure | Oil pressure warning limit - run mode | 40 | psi | |
| Resistance | Coolant temperature sender resistance | 500 to 2k | ohms | |
| Resistance | Exciter rotor winding resistance (frame 6H) | 1.54 | ohms | 68°F (20°C) ±10% |
| Resistance | Exciter rotor winding resistance (frames 6G, 6H, 6J, 6K) | 0.158 | ohms | 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.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Fuel | ASTM No. 2 diesel fuel | Cummins engines normally use ASTM No. 2 diesel fuel and will operate on alternate diesel fuels within the specifications shown in the Cummins engine Operation and Maintenance Manual. Never use galvanized or copper fuel lines, fittings or fuel tanks. | |||
| Grease | Kluber, type ASONIC GHY72 | 75.0 grams | P7 generator bearing re-lubrication grease; must be filled with same type used at manufacture and MUST NOT be mixed with any other type. | ||
| Grease | Lithium based grease, Mobilux No. 2 or Shell Alvania R3 | -30°C to 120°C | 2.74 oz (81 ml) | Generator end bearing lubrication; grease divided equally 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.
| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 101 | IDLE MODE | Indicates the engine is operating in idle mode. Grounding the engine idle input causes generator build-up to be inhibited and the engine to be governed at 800 RPM. | Warning | When ground is removed from the input, the genset returns to normal speed and voltage. |
| 102 | EMERGENCY STOP | Local or remote Emergency Stop activated. | Shutdown | Turn switch clockwise to pop out (local); move Run/Off/Auto to Off; press Reset; select Run or Auto. |
| 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 the 201-SHUTDOWN procedure. To check oil pressure, 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; reset control and restart. |
| 204 | OIL PRES SENDER | Oil pressure sender out of working range. | Warning | Check that the oil pressure sender is properly connected. |
| 210 | LOW COOLANT TEMP | Warning occurs when engine coolant temperature is 70 F (21 C) or lower. May be indicated even though coolant heaters are operating when ambient temperature falls below 40 F (4 C). | Warning | Check for coolant heater not connected to power supply (blown fuse or disconnected cord); check for low coolant level and replenish; check for open heater element (check 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) prime. | Warning | Reduce load; check air inlets/outlets for obstructions. |
| 212 | HIGH COOLANT TEMP | Indicates engine has overheated (coolant temperature above the shutdown trip point: 223 F (106 C) standby or 215 F (102 C) prime). | Shutdown | Check for obstructions to cooling airflow. Check fan belt. Reset control and restart after correcting problem. |
| 213 | COOLANT SENDER | Resistance of coolant temperature sender out of range. | Warning | Contact an authorized service center. |
| 214 | LOW COOLANT LVL | Indicates engine coolant level has fallen below the trip point. | Warning | Check coolant level and replenish; look for leaks. |
| 215 | LOW COOLANT LVL | Indicates engine coolant level has fallen below the trip point. LOW COOLANT LVL Shutdown will not occur if genset is in Idle mode (low coolant warning only). | Shutdown | Check coolant level and replenish. Look for leaks. Reset control and restart. |
| 220 | MAG PICKUP | Mag pickup speed indication not sensed or does not match genset output frequency. | Shutdown | Restart and check RPM. Check wires and MPU adjustment. |
| 221 | FAIL TO CRANK | Possible fault with control or starting system. | Shutdown | Check fuse F3 on the Engine Interface board. Clean the battery cable terminals and tighten all connections. Recharge or replace the battery. |
| 222 | OVERCRANK | Possible fuel system problem. | Shutdown | Check fuel supply, fuel filter and air filter. |
| 223 | OVERSPEED | Indicates engine has exceeded normal operating speed (115% ±1% of nominal). Engine runs and then shuts down. | Shutdown | Perform rack position fault/test; check governor output module A38 and digital board A32. |
| 224 | FAIL TO SYNCHRONIZE | The generator set has not synchronized to the system bus within the allowable time frame. | Check the governor system stability and adjust governing and synchronizer parameters as required. Check for fuel system problems which can cause engine instability. Synchronizing time can be improved by widening the synchronizing window and reducing the acceptance time delay. | |
| 226 | FAIL TO CLOSE | Indicates that the paralleling breaker has been given a signal to close, but has not closed properly. | Verify that the charging mechanism of the paralleling breaker is functioning properly. Check the close signal to the breaker. Verify that the auxiliary contact signals from the breaker to the PowerCommand control are operational. | |
| 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 or replace the battery cable terminals and cables. Check the engine DC alternator; replace if normal charging voltage is not obtained. |
| 231 | HIGH DC VOLTAGE | Indicates battery voltage exceeds 32 VDC. | Warning | Lower battery charger float level. |
| 232 | WEAK BATTERY | Indicates battery voltage drops below 60% of nominal for two seconds during starting. | Warning | See warning 230 Low DC Voltage; recharge or replace battery. |
| 240 | LOW FUEL-DAY | Indicates day tank fuel supply is running low. | Warning | Check fuel supply and replenish. |
| 241 | LOW FUEL | Indicates fuel supply is running low. | Warning | Check fuel supply and replenish. |
| 250 | EEPROM ERROR | PCC memory error; data corruption of critical operating parameters. | Shutdown | Perform the initial start setup procedure. If the set shuts down on the same EEPROM ERROR message, replace the digital board (A32). |
| 251 | EEPROM ERROR | PCC memory error; data corruption of non-critical operating parameters. | Warning | Perform the adjustment procedures, save the adjustments and reset the control. If the error persists perform the calibration procedures. If the error still persists replace the digital board (A32). |
| 252 | EEPROM ERROR | PCC memory error; data corruption of non-critical operating parameters. | Warning | Verify values/choices and repeat the save operation; reset; if persists replace A32. |
| 260 | RACK POSITION | One or both fuel racks not at commanded position. | Warning | Programmable to initiate a shutdown or a warning. |
| 261 | GROUND FAULT | Default message; editable for customer site requirements. | Warning | Programmable to initiate a shutdown or a warning. |
| 262 | RUPTURE BASIN / DAY TANK | Default message; editable for customer site requirements. | Warning | Same as customer fault. |
| 263 | HIGH GEN TEMP | Default message; editable for customer site requirements. | Warning | Same as customer fault. |
| 270 | PHASE ROTATION | The phase relationship between the generator set and the system bus is not matched. | Shutdown | Using a phase rotation checker, verify that the generator set phase rotation matches the phase orientation of the system bus. Verify that control wiring to the bus PT module on the PowerCommand control is properly connected. |
| 272 | FIRST START | The PowerCommand control is not receiving a proper signal from the system master first start sensor. The control reverts to a fallback mode in which breaker closure is automatically allowed if bus is de-energized. | Warning | Verify that the Master First Start Sensor is properly functioning (pulsing voltage present on the terminal). Verify the voltage pulse is present at the PowerCommand Control (terminal TB1-50) and repair interconnection wiring. |
| 301 | HIGH AC VOLTAGE | One or more phase voltages exceeded 130% of nominal, or 110% for 10 seconds. | Shutdown | Determine if the output voltage the control sees is low or high. Isolate to the alternator/control, regulator module (A37)/A31/A32, PT/CT module (A36), customer interface board (A34), analog board (A33) or the generator per Table 4-30. |
| 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 | Indicates that engine speed has dropped below 90% of nominal for 10 seconds. Five seconds before shutdown, a Load Dump signal is initiated. | Shutdown | Contact an authorized service center. |
| 320 | OVERCURRENT | Indicates that generator output current has exceeded 110% of rated for 60 seconds. | Warning | Contact an authorized service center. |
| 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 | Contact an authorized service center. |
| 322 | SHORT CIRCUIT | Indicates that generator output current has exceeded 175% of rated. | Shutdown | Contact an authorized service center. |
| 330 | OVERLOAD | Three-phase power output exceeds 105% of standby (or 115% of prime) rating. | Warning | Contact an authorized service center. |
| 335 | REVERSE POWER | Indicates that power is flowing into the generator set rather than out from the unit. Can be caused by engine failure, inability to carry load, or control or interconnection problems. | Shutdown | Verify proper CT orientation, wiring and connections; verify proper connection of load sharing lines; verify the generator set is operating at the correct frequency and voltage per Table 4-34. |
| 337 | LOSS OF EXCITATION | Indicates that the alternator excitation system is improperly adjusted or has failed. May also be caused by operation of filters and power factor correction capacitors presenting a leading power factor load. | Shutdown | Start the generator set in RUN mode and check/calibrate output voltage. Check load sharing lines for proper interconnections. See Section 6 Servicing the Generator, Exciter Rectifier and Exciter Rotor. |
| 401 | INVALID SETUP | Indicates the digital board is not properly calibrated for the generator set model (the model number corresponding to the cut resistor and the initial setup are not compatible). No initial setup data is saved. | Shutdown | Refer to Digital Board (A32) Calibration; correct resistor selection and initial setup. |
| 402 | INVALID CAL | Indicates that the control senses that more than one calibration resistor has been cut. No initial setup data is saved. | Shutdown | Refer to Digital Board (A32) Calibration; correct resistor selection. |
| blank | LOAD DEMAND | The PowerCommand control has received a signal to shut down from a remote device. This is a normal operation mode typically used in automatic control systems to minimize generator set operation hours and system fuel consumption. | When the load demand signal is removed, the generator set will automatically start, synchronize, and close to the system bus. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
⚠ Accidental starting during this procedure presents a hazard of severe personal injury or death; disconnect negative battery cable first
Tools: Dial indicator, Shims
⚠ Accidental starting during this procedure presents the hazard of severe personal injury or death; disconnect the negative (-) battery cable(s) first.
⚠ Do not bar engine over by prying on fan blade; this may damage the blade and cause sudden blade failure.
Tools: dial indicator, shims, wrenches
Tools: dial indicator, dial indicator holding device with magnetic base or clamp, capscrew tools, torque wrench
Tools: calibrated ammeter
Tools: precision resistor (engine sensor calibration tool)
Tools: power factor meter
Tools: calibrated frequency/voltmeter
⚠ Calibration and adjustment must be performed by technically qualified personnel only
Tools: Calibrated instruments
Tools: calibrated frequency/voltmeter
⚠ High voltage - unregulated excitation of the generator is involved
Tools: 12 volt battery, Jumper leads
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 |
|---|---|---|---|---|
| PT/CT board J9 | Yellow: Gen. A In; Orange: Gen. B In; Red: Gen. C In; Brown: Gen. Common In; White: CT21 (+) In; Gray: CT21 (common) In; Grn/Ylw: CT22 (+) In; Black: CT22 (common) In; Purple: CT23 (+) In; Blue: CT23 (common) In | |||
| A | CT1 | U load leads | Dot on CT must face alternator. | |
| B | CT2 | V load leads | Dot on CT must face alternator. | |
| C | CT3 | W load leads | Dot on CT must face alternator. |
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 |
|---|---|---|
| 100-025-001 | Air Filter | air_filter |
| 100-029-001 | AIR FILTER | air_filter |
| 1007973 | Air | air_filter |
| 110331287 | Air, Primary | air_filter |
| 110337797 | Air, Secondary | air_filter |
| 110337854 | Air, Secondary | air_filter |
| 11033838 | Air | air_filter |
| 110338381 | Air | air_filter |
| 11110175 | Air, Primary Magnum RS | air_filter |
| 11110176 | Air, Secondary Magnum RS | air_filter |
| 1132848 | Air, Primary | air_filter |
| 140-3288-02 | Cleaner, Air | air_filter |
| 14589 | PLATE CAMSHAFT LOCATING | air_filter |
| 2165039 | Air | air_filter |
| 2165059 | Air, Primary | air_filter |
| 2339823 | Air | air_filter |
| 266787 | Air, Primary | air_filter |
| 267953 | Air, Secondary | air_filter |
| 26815 | Air | air_filter |
| 27407 | Air | air_filter |
| 279245 | Air, Secondary | air_filter |
| 3044713 | Air | air_filter |
| 3214300100 | Compressor Air | air_filter |
| 3214300300 | Air, Primary | air_filter |
| 3214300800 | Air, Primary | air_filter |
| 3214303600 | Air, Primary | air_filter |
| 3214304100 | Air, Primary | air_filter |
| 3214305300 | Air, Secondary | air_filter |
| 3214306500 | Air, Secondary | air_filter |
| 3214306800 | Air, Primary | air_filter |
| 3214308700 | Compressor Air | air_filter |
| 3388840M2 | Cab Air | air_filter |
| 3632350M1 | Air, Secondary | air_filter |
| 3901475M1 | Relevage / Lift Kraftheber | air_filter |
| 3901476M1 | Relevage / Lift Kraftheber | air_filter |
| 3901477M1 | Relevage / Lift Kraftheber | air_filter |
| 3901478M1 | Relevage / Lift Kraftheber | air_filter |
| 3902782M1 | Air | air_filter |
| 4144966 | Air, Secondary | air_filter |
| 4271467M1 | Air, Primary Magnum RS | air_filter |
| 4271468M1 | Air, Secondary Magnum RS | air_filter |
| 4319256 | Air, Secondary | air_filter |
| 4319257 | Air, Primary | air_filter |
| 49931583 | Air | air_filter |
| 5016603M1 | Air | air_filter |
| 5016604M1 | Air | air_filter |
| 609374 | Air, Secondary | air_filter |
| 663856 | Air, Primary | air_filter |
| 6I2503 | Air, Magnum RS | air_filter |
| 700274 | Air, Secondary | air_filter |
| 700282 | Air, Primary | air_filter |
| 701165 | Air, Primary | air_filter |
| 70185128 | Air | air_filter |
| 70185824 | Air | air_filter |
| 70197588 | Air, Secondary | air_filter |
| 70235449 | Air | air_filter |
| 70235863 | Air | air_filter |
| 70237395 | Air | air_filter |
| 70239518 | Air | air_filter |
| 70243163 | Air | air_filter |
| 70244728 | Air | air_filter |
| 702455 | Air, Primary | air_filter |
| 702463 | Air, Secondary | air_filter |
| 70257024 | Air, Primary | air_filter |
| 70257029 | Air, Secondary | air_filter |
| 70257597 | Air | air_filter |
| 70259793 | Air, Secondary | air_filter |
| 70263434 | Air, Primary | air_filter |
| 70263435 | Air, Secondary | air_filter |
| 70264113 | Air, Secondary | air_filter |
| 70264114 | Air, Primary | air_filter |
| 70264115 | Air, Primary | air_filter |
| 70264740 | Air | air_filter |
| 70264744 | Air, Primary | air_filter |
| 70264745 | Air, Secondary | air_filter |
| 70266786 | Air, Primary | air_filter |
| 70267953 | Air, Secondary | air_filter |
| 70267962 | Air, Secondary | air_filter |
| 70269244 | Air, Primary | air_filter |
| 70269245 | Air, Secondary | air_filter |
| 70569300 | Cab Air | air_filter |
| 70620717 | Air | air_filter |
| 70622893 | Air | air_filter |
| 70632707 | Air | air_filter |
| 70634446 | Air | air_filter |
| 70638414 | Air | air_filter |
| 70638731 | Air | air_filter |
| 70659387 | Air, Primary | air_filter |
| 70662477 | Air, Secondary | air_filter |
| 70662609 | Air, Secondary | air_filter |
| 70671838 | Air, Primary | air_filter |
| 70671839 | Air, Secondary | air_filter |
| 70684733 | Air, Primary | air_filter |
| 70684734 | Air, Primary | air_filter |
| 71004652 | Air | air_filter |
| 71167808 | Air | air_filter |
| 72083768 | Air, Secondary | air_filter |
| 72083771 | Air, Primary | air_filter |
| 72097035 | Air | air_filter |
| 72097371 | Air | air_filter |
| 72097407 | Air | air_filter |
| 72162545 | Air, Primary | air_filter |
| 72163296 | Air, Secondary | air_filter |
| 72257812 | Air | air_filter |
| 73040631 | Air | air_filter |
| 73042190 | Air | air_filter |
| 73046858 | Air | air_filter |
| 73622243 | Air, Primary | air_filter |
| 74052520 | Air | air_filter |
| 74059292 | Air | air_filter |
| 74379069 | Air | air_filter |
| 74993158 | Air | air_filter |
| 74996245 | Air | air_filter |
| 74997568 | Air | air_filter |
| 79011386 | Air, Primary | air_filter |
| 79011387 | Air, Secondary | air_filter |
| 8022345 | Air, Panel | air_filter |
| 8422800 | Air, Primary | air_filter |
| AF1601M | Air | air_filter |
| AF1638 | Air, Primary | air_filter |
| AF1639 | Air, Secondary | air_filter |
| AF1658K | Air | air_filter |
| AF1686 | Air, Panel | air_filter |
| AF1695 | Cab Air | air_filter |
| AF1727 | Air, Panel | air_filter |
| AF1733K | Air, Primary | air_filter |
| AF1735K | Air, Primary | air_filter |
| AF1767 | Air, Secondary | air_filter |
| AF1768M | Air, Primary | air_filter |
| AF1791 | Air | air_filter |
| AF1830KM | Air, Primary | air_filter |
| AF1839 | Air, Secondary | air_filter |
| AF1840 | Air | air_filter |
| AF1841 | Air, Secondary | air_filter |
| AF1842 | Air, Secondary | air_filter |
| AF1843 | Air, Secondary | air_filter |
| AF1887M | Air | air_filter |
| AF1917M | Air, Primary | air_filter |
| AF1934MAND | Air | air_filter |
| AF1935M | Air | air_filter |
| AF1972 | Air | air_filter |
| AF25057 | Air | air_filter |
| AF25064 | Air | air_filter |
| AF25065 | Air, Primary | air_filter |
| AF25067 | Air | air_filter |
| AF25129M | Air, Magnum RS | air_filter |
| AF25352 | Air | air_filter |
| AF25376 | Air | air_filter |
| AF25425 | Air | air_filter |
| AF25454 | Air, Primary Magnum RS | air_filter |
| AF25468 | Air, Secondary Magnum RS | air_filter |
| AF25481 | Air, Primary | air_filter |
| AF25491 | Air, Secondary Magnum RS | air_filter |
| AF25558 | Air, Secondary | air_filter |
| AF25617 | Air, Primary | air_filter |
| AF25618 | Air, Secondary Magnum RS | air_filter |
| AF25723 | Air | air_filter |
| AF25724 | Air | air_filter |
| AF25729 | Air | air_filter |
| AF25730 | Air | air_filter |
| AF25748 | air_filter | |
| AF25749 | air_filter | |
| AF25849 | Cab Air | air_filter |
| AF25964 | Air, Primary Magnum RS | air_filter |
| AF263 | Air | air_filter |
| AF26393 | Air | air_filter |
| AF26394 | Air | air_filter |
| AF26395 | Air | air_filter |
| AF26396 | Air | air_filter |
| AF26398 | Air | air_filter |
| AF26399 | Air, Primary | air_filter |
| AF26400 | Air, Secondary | air_filter |
| AF26401 | Air | air_filter |
| AF26402 | Air | air_filter |
| AF289 | air_filter | |
| AF291 | Air | air_filter |
| AF303 | Air | air_filter |
| AF303AND | Air, Primary | air_filter |
| AF335M | Air, Primary | air_filter |
| AF338 | Air, Secondary | air_filter |
| AF349 | Air, Primary | air_filter |
| AF349M | Air | air_filter |
| AF350K | Air | air_filter |
| AF350KM | Air | air_filter |
| AF351K | Air | air_filter |
| AF351KM | Air | air_filter |
| AF353KM | Air | air_filter |
| AF362 | Air | air_filter |
| AF4058 | Air, Primary | air_filter |
| AF4059K | Air | air_filter |
| AF4060 | Air, Primary | air_filter |
| AF4066 | Air | air_filter |
| AF4067 | Air | air_filter |
| AF409K | Air | air_filter |
| AF4100 | Air | air_filter |
| AF4103 | Air, Secondary | air_filter |
| AF4124 | Air | air_filter |
| AF4135 | Air | air_filter |
| AF4150 | Air, Secondary | air_filter |
| AF4164K | Air, Primary | air_filter |
| AF4165 | Air, Secondary | air_filter |
| AF417K | Air | air_filter |
| AF418 | Air, Primary | air_filter |
| AF418M | Air, Primary | air_filter |
| AF424 | air_filter | |
| AF424M | Air, Primary | air_filter |
| AF427M | Air | air_filter |
| AF434KM | Air, Primary | air_filter |
| AF435KM | Air | air_filter |
| AF436M | Air | air_filter |
| AF437K | Air | air_filter |
| AF448 | Air | air_filter |
| AF4521 | Air, Secondary | air_filter |
| AF4522 | Air, Secondary | air_filter |
| AF4523 | air_filter | |
| AF453 | Air | air_filter |
| AF4553M | Air, Primary | air_filter |
| AF4554M | Air, Secondary | air_filter |
| AF456 | air_filter | |
| AF4567 | air_filter | |
| AF4581 | air_filter | |
| AF4589 | Air | air_filter |
| AF459 | Air | air_filter |
| AF461 | Air | air_filter |
| AF4626 | Air, Secondary | air_filter |
| AF4713 | air_filter | |
| AF471M | Air, Secondary | air_filter |
| AF472AND | Air | air_filter |
| AF472M | Air, Primary | air_filter |
| AF4734 | Air, Secondary | air_filter |
| AF4748K | Air, Primary | air_filter |
| AF4754 | Air, Primary | air_filter |
| AF4755 | Air, Secondary | air_filter |
| AF4757 | Air | air_filter |
| AF4758KM | Air | air_filter |
| AF4807 | Air, Panel | air_filter |
| AF4828 | Air, Secondary | air_filter |
| AF4838AND | Air | air_filter |
| AF486K | Air, Primary | air_filter |
| AF487 | Air, Secondary | air_filter |
| AF4896 | Air | air_filter |
| AF490M | Air, Secondary | air_filter |
| AF491 | Air | air_filter |
| AF492 | Air | air_filter |
| AF493 | Air | air_filter |
| AF4994 | Air, Secondary | air_filter |
| AF804M | Air, Secondary | air_filter |
| AF819KM | Air | air_filter |
| AF820M | Air, Secondary | air_filter |
| AF821M | Air, Primary | air_filter |
| AF835K | Air | air_filter |
| AF843 | Air | air_filter |
| AF886M | Air | air_filter |
| AF929 | Air, Secondary | air_filter |
| AF937 | Air, Secondary | air_filter |
| AF939 | Air, Primary | air_filter |
| AF940K | Air | air_filter |
| AF955 | air_filter | |
| AF956M | air_filter | |
| AF964 | Air, Primary | air_filter |
| AF979M | Air, Primary | air_filter |
| AF987 | Air, Secondary | air_filter |
| AF988 | Air, Secondary | air_filter |
| AF990 | Air | air_filter |
| AF991 | Air | air_filter |
| AH1198 | Air | air_filter |
| C30810 | Air | air_filter |
| CF810 | Air | air_filter |
| P122115 | Air, Panel | air_filter |
| P122425 | Air, Secondary | air_filter |
| P126318 | Air, Primary | air_filter |
| s9001039 | Air Cleaner Precleaner | air_filter |
| 3377193 | Battery Tester | battery_tester |
| 08a00029 | Drive Belt, Cooling Fan | belt |
| 100-028-001 | Coolant Filter | belt |
| 100-031-001 | BELT | belt |
| 13800007 | Drive Belt, Alternator | belt |
| 3822524 | Use on v-belts ( 3/8 to 7/8) and v-ribbed belts with 5 ribs or less. | belt |
| 3822525 | Use on v-beits larger than 7/8 in. and v-ribbed belts with 6 or more ribs. | belt |
| A40-TB1-2 | SWITCHED B+ | belt |
| A40-TB1-4 | GROUND | belt |
| A40-TB1-7 | COMMON ALARM | belt |
| ST669 | water pump type grease listed below, or its equivalent | belt |
| 01a0028 | Bolts, coupling | bolt |
| 3825183 | INSITE™ cable | cable |
| 49400361 | Common Alarm Circuit | common_alarm_circuit |
| 49400355 | Common Warning Circuit | common_warning_circuit |
| 19200001 | Fuel pump connector | connector |
| 3621208 | B Connector DRC26-40SB-LO11 | connector |
| 3656990 | Connector Socket 0462-201-20141 | connector |
| 3657034 | Cavity Plugs 0413-204-2005 | connector |
| 3822917 | Female 3822917 | connector |
| 3823995 | Weatherpack Deutsch/Metri-Pac Male 3823993 | connector |
| 3823996 | Weatherpack Deutsch/Metri-Pac Male 3823994 | connector |
| 3824811 | Test lead for 9-pin Deutsch connector | connector |
| 3824812 | Weatherpack Deutsch Female 3824811 | connector |
| 1076751M1 | Water, Spin-On | coolant_filter |
| 16998304 | Water, Spin-On | coolant_filter |
| 28043 | Coolant | coolant_filter |
| 3315116 | Cummins Part No. DCA4 Units | coolant_filter |
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 QST30-G2 engine has an oil capacity of 140.0 liters.
The Cummins/Onan QST30-G2 has a displacement of 30.5 liters with 12 cylinders.
The Cummins/Onan QST30-G2 powers 8 generator set(s), including Cummins/Onan 700DFHB, Cummins/Onan 800DFHB, Cummins/Onan DFHA, Cummins/Onan DFHB, Katolight D800FJZ4.
A commonly reported issue on generators using the Cummins/Onan QST30-G2 is: Warning lamp lights. MESSAGE: WEAK BATTERY 232 − WARNING. Fix: Discharged or defective battery. See Warning message 230, LOW DC VOLTAGE..