Specifications
Ratings spec sheet not in our library yet — see the documents below.
Filters & service parts
model family| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | 3.5 amps at 24VDC | — | 2000 hr | find | |
| Fuel filter | 4.5 amps at 24VDC | — | 2000 hr | find | |
| Oil filter | P8500 fuel pump (G-Drive) | 3825142 | 2000 hr | PartsGeek | |
| Belt | ST669 | 250 hr | PartsGeek | ||
| Coolant | -40° to 85°C [-40° to 185°F] | — | 2000 hr | ||
| Coolant filter | — | 1000 hr | find | ||
| Oil | 2 Watts @ 70°C [158°F] | 2.6 | — | 2000 hr |
Compiled from this model's family documentation — may include parts for closely-related variants. Confirm the exact part for your serial number.
Common questions
What oil filter does the Cummins/Onan QST30 use?
The Cummins/Onan QST30 uses oil filter part number 3825142.
Troubleshooting
5Fault codes
| Code | Meaning | Remedy |
|---|---|---|
| RAIN | Rain | Repair as soon as convenient |
| SOE | System Over-ride Event | |
| 0 | Check electronic engine controls (fault code lamp) |
Symptoms & remedies
| Symptom | Remedy |
|---|---|
| Common Warning LED flashes once | Enter Diagnostic Mode |
| Fault codes are displayed on Common Shutdown and Common Warning LEDs | Use Cummins InPower™ Electronic Service Tool or Modbus Communications Datalink to read fault codes |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
42| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 19200074 | Engine Harness Adaptor Cable | Engine harness adaptor cable | PartsGeek | |
| 19a00292 | Engine Speed Sensor | Engine speed sensor | PartsGeek | |
| 19a00295 | Fuel Shut-Off Valve | Fuel shut off valve | PartsGeek | |
| 19a00296 | Rack Position Actuator (integral to the RP39 fuel pump) | Rack position actuator | PartsGeek | |
| 19a00297 | Meter Drivers | Meter drivers | PartsGeek | |
| 19a00Z25 | Fuel Pump Rack Actuator Valve | Fuel pump rack actuator valve | PartsGeek | |
| 3375049 | Oil Filter Wrench | 1 | Oil filter | PartsGeek |
| 3377193 | Battery Tester | 1 | Battery tester | PartsGeek |
| 4-20 | EGR COOLANT PUMP | 1 | Pump | PartsGeek |
| 4-25 | OIL PRES SENDER | Thermostat | PartsGeek | |
| 4-26 | HIGH COOLANT TEMP | Sensor | PartsGeek | |
| 4-27 | HIGH COOLANT TEMP | Sensor | PartsGeek | |
| 4-28 | LOW COOLANT LVL | Sensor | PartsGeek | |
| 4-33 | EEPROM ERROR Warning/Shutdown | Sensor | PartsGeek | |
| 4900294 | Oil Pressure Sensor | Oil pressure sensor | PartsGeek | |
| 49400355 | Common Warning Circuit | Common warning circuit | PartsGeek | |
| 49400356 | Sleeve Position Activator (integral to the RP39 fuel pump) | Sleeve position activator | PartsGeek | |
| 49400361 | Common Alarm Circuit | Common alarm circuit | PartsGeek | |
| 5572670 | Thermostat Seal Installation Tool | Thermostat | PartsGeek | |
| 78000067 | Coolant Temperature Sensor | Coolant temperature sensor | PartsGeek | |
| ST1225 | Thermostat Seal Driver | 1 | Thermostat | PartsGeek |
| ST669 | water pump type grease listed below, or its equivalent | 1 | Belt | PartsGeek |
| WA27F | Pneumatic terminal crimp tool from Daniels Manufacturing Corporation | 1 | Tool | PartsGeek |
| 17800008 | Component weighs 23 kg [50 lb] or more. To avoid personal injury, use a hoist or get assistance to lift the component. | Service part / kit | PartsGeek | |
| 3375432 | Crack Detection Kit | 1 | Service part / kit | PartsGeek |
| 3375434 | crack detection developer | 1 | Service part / kit | PartsGeek |
| 3666134 | QST30 & M Manual | Service part / kit | PartsGeek | |
| 3666184 | QST30 G-Drive Fuel System T & R Manual | Service part / kit | PartsGeek | |
| 3666185 | QST30 G-Drive Wiring/Fault Code Diagram | Service part / kit | PartsGeek | |
| 3666196 | QSTS30 Shop Manual | Service part / kit | PartsGeek | |
| 3666242 | QST30 G-Drive Pocket Fault Code Cards | Service part / kit | PartsGeek | |
| 3672102 | QST30-G1/G2/G3 Parts Manual | Service part / kit | PartsGeek | |
| 3884904 | QST30 G-Drive Engine Installation Requirements | Service part / kit | PartsGeek | |
| 4-29 | FAIL TO CRANK | Service part / kit | PartsGeek | |
| 4-30 | OVERSPEED | Service part / kit | PartsGeek | |
| 4-31 | HIGH DC VOLTAGE | Service part / kit | PartsGeek | |
| 4-35 | WEAK BATTERY | Service part / kit | PartsGeek | |
| 4-36 | CUSTOMER FAULT 1* | Service part / kit | PartsGeek | |
| 4-39 | DAY TANK* | Service part / kit | PartsGeek | |
| C2800 | Fleetguard® refractometer | 1 | Service part / kit | PartsGeek |
| DTO6-4S | Coolant Level Switch interface connector | 1 | Service part / kit | PartsGeek |
| K13-1 | Terminal positioner for use with 0.5 mm² [20 AWG] terminals | 1 | Service part / kit | PartsGeek |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
Available documents
Engine spec — 0032276 (Cummins/Onan)Engine spec — 0032425 (Cummins/Onan)Spec sheet — Cummins-800DFHB-with-QST30-G2-Engine-Spec-Sheet-S-1135 (Cummins/Onan)Reference — B20BiodieselFAQJan2009Reference — Schedule Technical2012 (Cummins/Onan)Parts manual — {5bc4040d-d72a-4ebb-81b9-034afcefa4a9} Cummins Mechanical Electrical Service Tools June 2019Service manual — CUMMINS DIESELS QST30 Generator Drive Fuel Control Governor 1998 (2) (Cummins/Onan)Service manual — Cummins Diesel QST30 Manual 1997 (Cummins/Onan)Service manual — Cummins-DFHA-DFHB-DFHC-DFHD-spec-A-thru-J-service-manual-QST30-engine-with-PowerCommand-3.1-control (Cummins/Onan)Service manual — ServiceInstructions5 (Cummins/Onan)