The Cummins/Onan QST30-G5 is a 30.5 L 12-cylinder turbocharged and low temperature after-cooled engine rated at 1500 rpm. It powers generator sets from Cummins/Onan and Katolight, including the C2000D6RG, DFHD 60 Hz, D1000FJZ4 and D1000FNZ4. It holds 154 L (40.7 gal) of oil and 202.5 L (53.5 gal) of coolant.
Also known as: Cummins QST30-G5, QST30-G5
Part of the Cummins/Onan QST30 engine family — 7 variants share parts & fitment.
| Oil capacity | 154.0 L |
|---|---|
| Coolant capacity | 202.5 L |
| Displacement | 30.5 L |
| Cylinders | 12 |
| Aspiration | turbocharged and low temperature after-cooled |
| Rated speed | 1500 rpm |
Shared across brands: Cummins/Onan, Katolight
How to read your Cummins/Onan engine serial & model number →
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | ||||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | 154.0 L | — | |||
| Spark plug | — |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's 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-G5 engine has an oil capacity of 154.0 liters.
The Cummins/Onan QST30-G5 has a displacement of 30.5 liters with 12 cylinders.
The Cummins/Onan QST30-G5 powers 7 generator set(s), including Cummins/Onan C2000D6RG, Cummins/Onan DFHD 60 Hz, Katolight D1000FJZ4, Katolight D1000FNZ4, Katolight D1000FPZ4.