Service parts for the DQCA
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredElectrical
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 600 kW |
| Standby kVA | 750 |
| Prime power | 545 kW |
| Emissions | EPA NSPS Stationary Emergency Tier 2 |
| Controller | PowerCommand, PowerCommand 2.3, PowerCommand 2100 |
| Oil capacity | 12.0 L |
| Alternator | Stamford/AvK HC634 (4-pole, Class F insulation) |
| Voltage options | 110/190 V, 115/200 V, 120/208 V, 127/220 V, 139/240 V, 220/380 V, 230/380 V, 240/416 V, 255/440 V |
| Phase | 3 |
| Rated current | 722.5 A |
| Power factor | 1 |
| Circuit breaker | 600 A |
| Battery group | 8D |
| Battery cranking | 1400 CCA |
| Battery voltage | 24 V |
| Battery quantity | 2 |
| Starting system | 24 V DC |
| Coolant capacity | 109.5 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 4395×1855×2065 mm |
| Dry weight | 6075 kg |
| Wet weight | 6337 kg |
| Sound level | 74.1 dBA @ 7 m |
| Fuel tank | 120.0 L |
| Tank runtime | 8 hr |
Engine
| Oil capacity | 102.0 L |
|---|---|
| Coolant capacity | 109.5 L |
| Displacement | 23.15 L |
| Aspiration | Turbocharged and low temperature after-cooled |
| Rated speed | 1800 rpm |
Filters for the Cummins/Onan QSK23-G7 NR2
2Engine-mounted filters the filter manufacturers list for this engine family. These come from the engine, not from this generator set’s own parts list, so confirm against your serial number before ordering.
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Fuel / water separator | P552006 | Fuel Filter, Water Separator Spin-On Twist&Drain | CUMMINS 3089916, CUMMINS 4095189, NAPA 3645, BALDWIN BF1262 | FridayParts $42.88 |
Listed for this engine in only one kind of machine, so they may depend on how the engine was installed:
| System | Filter | Description | Cross-references | |
|---|---|---|---|---|
| Oil filter | P551670 | Lube Filter, Spin-On Full Flow | CUMMINS 298670, CUMMINS 299670, NAPA 1970, CARBOCOL 0026 | FridayParts $26.68 |
Same engine, other brands
1 brandThe Cummins/Onan QSK23-G7 NR2 in this set also powers 2 generator sets sold under 1 other brand. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| MQ Power | 800kW Containerized Diesel Generator Set, CG800C2 |
Maintenance & consumables
for the Cummins/Onan QSK23-G7 NR2| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | AF25544 | AF25544 | Amazon eBay $285.93 NAPA $391.96 | ||
| Fuel filter | (1) primary element AF25544; (1) secondary element AF25545, (2) Cummins Filtration FS1006 | — | 500 hr | ||
| Fuel filter | FS1006 | FS1006 | Amazon eBay $29.99 NAPA $90.16 | ||
| Oil filter | Cummins QuickServe® Commitment | LF9325 | 250 hr | Amazon eBay $127.04 KuduParts $74.00 FridayParts $75.99 | |
| Battery | 526−0112 | A048G602 | 500 hr | eBay | |
| Belt | Steel, flanged; Stainless steel flex, NPT | — | 15000 hr | ||
| Coolant | Antifreeze 50/50 (Ethylene glycol) | 109.5 | — | 24000 hr | |
| Coolant filter | Cummins Filtration WF2076 | — | 500 hr | ||
| Oil | Cummins QuickServe® Commitment | — | 250 hr | ||
| Spark plug | — | 500 hr |
Service specifications
56| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | AC waveform THD (THDV) | < 5 | % | no load to full linear load |
| Other | AC waveform Total Harmonic Distortion (THDV) | < 5 no load to full linear load, < 3 for any single harmonic | % | |
| Other | BMEP at set rated load (prime) | 1885 | kPa | prime rating |
| Other | BMEP at set rated load (standby) | 2109 | kPa | standby rating |
| Other | Breaker fail to synchronize default time delay | 120 | s | adjustable 10–900 s |
| Other | Compression ratio | 16:1 | ||
| Other | Derate above 1402 m (4600 ft) / 40 °C | 4.5% per 305 m (1000 ft) and 11.0% per 10 °C (18 °F) | standby and prime | |
| Other | High AC voltage shutdown default | 110% | % of nominal voltage | for 10 s; adjustable 105–125%, 0.1–10 s |
| Other | Instantaneous pickup (Ii) range (Micrologic 3.0 and 5.0) | 1.5–12 x In | x In | |
| Other | Long-time delay tr | 0.5–24 | s | at 6 x Ir |
| Other | Long-time pickup (Ir) adjustment range | 0.4–1.0 x In | x In | sensor plug rating In |
| Other | Low AC voltage shutdown default | 85% | % of reference voltage | for 10 s; adjustable 50–95%, 2–20 s |
| Other | Over frequency shutdown/warning default | 6 | Hz above nominal | for 20 s, disabled; adjustable 2–10 Hz above set point, 1–20 s |
| Other | Over load (kW) warning default | 105% | % of rated kW | adjustment range 80–140%, 0–120 s delay; default 60 s |
| Other | Piston speed | 11.4 | m/s | |
| Other | Reverse Var shutdown default | 20% | % of rated Var | for 10 s; adjustable 15–50%, 10–60 s |
| Other | Reverse power shutdown default | 10% | % of standby kW | for 3 s; adjustable 5–20%, 1–15 s |
| Other | Short circuit protection threshold | 175% | % of rating | output current on any phase |
| Other | Telephone Harmonic Factor (THF) | < 3 | ||
| Other | Telephone Influence Factor (TIF) | < 50 | per NEMA MG1-22.43 | |
| Other | Under frequency shutdown default | 6 | Hz below reference | for 10 s; adjustable 2–10 Hz below set point, 5–20 s |
| Other | Wire stripping length | 1.38 In (35 mm) | in | |
| Pressure | BMEP at set rated load | 2214 | kPa | prime rating |
| Pressure | BMEP at set rated load | 2435 | kPa | standby rating |
| Pressure | Maximum air cleaner restriction | 6.2 | kPa | |
| Pressure | Maximum back pressure | 10.1 | kPa | |
| Pressure | Maximum back pressure | 6.8 | kPa | exhaust |
| Pressure | Maximum cooling air flow static restriction | 0.12 | kPa | |
| Pressure | Maximum fuel inlet restriction | 13.44 | kPa | |
| Pressure | Maximum fuel inlet restriction | 30 | kPa | |
| Pressure | Maximum fuel return line restriction | 34 | kPa | |
| Speed | Frequency regulation | Isochronous | ||
| Speed | Governor regulation class | Class G3 | ISO 8528 Part 1 | |
| Speed | Overspeed limit | 2100 | rpm | |
| Speed | Overspeed limit | 2100 ±50 | rpm | |
| Speed | Random frequency variation | + 0.25 | % | |
| Speed | Random frequency variation | ± 0.25 | % | |
| Speed | Random frequency variation | ± 0.25% | % | |
| Speed | Rated speed | 1800 | rpm | 60 Hz |
| Temperature | Ambient design (standard set-mounted radiator cooling) | 50 | °C | |
| Temperature | Ambient design (standard set-mounted radiator) | 50 | °C | |
| Temperature | Exhaust temperature | 458 | °C | prime rating, at set rated load |
| Temperature | Exhaust temperature | 476 | °C | standby rating, at set rated load |
| Temperature | Exhaust temperature at set rated load (prime) | 463 | °C | prime |
| Temperature | Exhaust temperature at set rated load (standby) | 469 | °C | standby |
| Temperature | Maximum aftercooler inlet temp | 49 | °C | |
| Temperature | Maximum fuel inlet temperature | 71 | °C | |
| Temperature | Maximum jacket water outlet temp (remote radiator) | 104 | °C | standby |
| Torque | Circuit breaker terminal tightening torque (AWG 1/0...750 kcmil) | 548.75 Lbf.In (62 N.m) | Lbf.In | 0.08…0.62 in² (50…400 mm²) |
| Voltage | Random voltage variation | + 0.5 | % | |
| Voltage | Random voltage variation | ± 0.5 | % | |
| Voltage | Random voltage variation | ± 0.5% | % | |
| Voltage | Standard temperature rise | 150 | °C | Standby at 40 °C ambient |
| Voltage | Voltage regulation, no load to full load | + 0.5 | % | |
| Voltage | Voltage regulation, no load to full load | ± 0.5 | % | |
| Voltage | Voltage regulation, no load to full load | ± 0.5% | % | no load to full load |
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 |
|---|---|---|---|---|---|
| Fuel | ASTM D975 No. 2-D | ASTM D975 | Cetane number: 40-50. 300-500 ppm Sulfur. Fuel inlet temperature 40°C (104°F) reference. | ||
| Fuel | number 2 diesel fuel | Direct injection, fuel filter, automatic electric fuel shutoff |
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
11| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 27 | Low AC voltage shutdown | Voltage on any phase has dropped below a preset value. | Shutdown | Adjustable 50-95% of reference voltage, time delay 2-20 seconds; default 85% for 10 seconds. |
| 32 | Reverse power shutdown | Reverse power detected. | Shutdown | Adjustment range 5-20% of standby kW rating, delay 1-15 seconds; default 10%, 3 seconds. |
| 40 | Reverse Var shutdown | Reverse reactive power detected. | Shutdown | Adjustable 15-50% of rated Var output, delay 10-60 seconds; default 20%, 10 seconds. |
| 46 | Negative sequence overcurrent warning | Excessive imbalances in the three phase load currents and/or power factors. | Warning | Control protects generator from damage due to phase imbalance. |
| 51 | Overcurrent warning/shutdown | Implementation of the thermal damage curve with instantaneous trip level based on CT ratio and application power rating. | Shutdown | AmpSentry protective relay action; see document R1053 time over current curve. |
| 51G | Ground fault overcurrent | Detects a ground fault via external ground fault relay contact input or measured ground current from external CT. | Shutdown | Time delays and thresholds adjustable via InPower or HMI. |
| 59 | High AC voltage shutdown | Output voltage on any phase exceeds preset values; trip time inversely proportional to amount above threshold. | Shutdown | Adjustable 105-125% of nominal voltage, time delay 0.1-10 seconds; default 110% for 10 seconds. |
| 81 o | Over frequency shutdown/warning | Generator set is operating at a potentially damaging frequency level. Settings adjustable from 2-10 Hz above nominal governor set point for a 1-20 second time delay. Default: 6 Hz, 20 seconds, disabled. | Warning | |
| 81 u | Under frequency shutdown | Generator set output frequency cannot be maintained. Settings adjustable from 2-10 Hz below reference governor set point, for a 5-20 second time delay. Default: 6 Hz, 10 seconds. | Shutdown | |
| 81o | Over frequency shutdown/warning | Genset is operating at a potentially damaging frequency level. | Warning | Adjustable 2-10 Hz above nominal governor set point, 1-20 second delay; default 6 Hz, 20 seconds, disabled. |
| 81u | Under frequency shutdown | Genset output frequency cannot be maintained. | Shutdown | Adjustable 2-10 Hz below reference governor set point, 5-20 second delay; default 6 Hz, 10 seconds. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
3Trip Unit Operation Verification diagnostic
Tools: Trip unit test kit
- Connect a test kit to the trip unit test plug receptacle.
- Perform verification tests per instructions shipped with the test kit to verify trip unit functions.
Battery replacement / battery rack installation maintenance
- Isolate DC supply before working on battery connections.
- Install battery rack with hold-down, floor standing.
- Install battery with minimum 2200 amps capacity at -18 °C to 0 °C.
- Verify 24 volt negative ground connection.
Trip Unit Switch Adjustment operation
⚠ Wait a minimum of 15 minutes after circuit breaker trips before resetting to allow thermal imaging to reset completely to zero.
Tools: Wire seal MICROTUSEAL
- Open switch cover.
- Adjust the appropriate switches to desired values.
- Replace switch cover.
- Use wire seal MICROTUSEAL, if necessary, to provide tamper evidence.
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
| Voltage | Phase | Connection | Leads | Notes |
|---|---|---|---|---|
| 120/208 | 3 | Wye | 12/6 | Winding 311/312; ADS-631; feature code BC38-2 |
| 120/240 | 3 | Delta | 12/6 | Winding 311/312 |
| 12470-13800 | 3 | Wye, 3-phase | Winding no. 6062 | Temp rise 125/105/80 °C; ADS-521; feature code B448; max surge kVA 91 |
| 127/220 | 3 | Wye | 12/6 | Winding 311/312 |
| 133/230 | 3 | Wye | 12/6 | Winding 311/312 |
| 139/240 | 3 | Wye | 12/6 | Winding 311/312 |
| 190-480 | Wye | Temp rise 125/105 degrees C; Duty S/P; Max surge 2944 kVA; Winding No. 311; ADS-309; Feature code B731-2 | ||
| 190/380 | 3 | Wye | Winding 311; ADS-631; feature code BC37-2 | |
| 200/400 | 3 | Wye | Winding 311; ADS-310; feature code BC35-2 | |
| 208/416 | Wye | Temp rise 105/80 degrees C; Duty S/P; Max surge 2944 kVA; Winding No. 311; ADS-309; Feature code B733-2 | ||
| 208/416 | 3 | Wye | Winding 311; ADS-632; feature code BC44-2 | |
| 220/380 | Wye | Temp rise 105/80 degrees C; Duty S/P; Max surge 3313 kVA; Winding No. 311; ADS-310; Feature code B599-2 | ||
| 220/380 | 3 | 6 leads | 6 | Winding no. 13; 125°C rise rating 2004 kW / 2505 kVA; stator resistance L-L 0.00102 Ohms; rotor resistance 2.31 Ohms @22°C |
| 240/416 | 3 | 6 leads | 6 | Winding no. 13; 125°C rise rating 2004 kW / 2505 kVA; stator resistance L-L 0.00102 Ohms; rotor resistance 2.31 Ohms @22°C |
| 240/416 | 3 | Wye | 12/6 | Winding 311/312 |
| 254/440 | 3 | 6 leads | 6 | Winding no. 312; 125°C rise rating 2000 kW / 2500 kVA; stator resistance L-L 0.00152 Ohms; rotor resistance 2.31 Ohms @22°C |
| 254/440 | 3 | Wye | 12/6 | Winding 311/312 |
| 266/460 | 3 | Wye | 12/6 | Winding 311/312 |
| 277/480 | 3 | 6 leads | 6 | Winding no. 312; 125°C rise rating 2080 kW / 2600 kVA; stator resistance L-L 0.00152 Ohms; rotor resistance 2.31 Ohms @22°C |
| 277/480 | 3 | Wye | 12/6 | Winding 311/312; ADS-631; feature code BC38-2 / B876-2 |
| 277/480 | 3 | Wye, 4 Wire | Feature code R002-2 Voltage-277/480, 3 Phase, Wye, 4 Wire | |
| 280/416 | 3 | Wye | Winding 311; ADS-632; feature code B733-2 | |
| 346/600 | 3 | 6 leads | 6 | Winding no. 07; 125°C rise rating 2080 kW / 2600 kVA; stator resistance L-L 0.00220 Ohms; rotor resistance 2.31 Ohms @22°C |
| 347/600 | 3 | Wye | 6 | Winding 07; ADS-309; feature code B720-2 |
| 380 | Wye | Temp rise 80 degrees C; Duty S; Max surge 3866 kVA; Winding No. 312; ADS-311; Feature code B660-2 | ||
| 380 | 3 | Wye | Winding 311; ADS-632; feature code BC43-2 | |
| 380 | 3 | Wye, 3-phase | Winding no. 7327 | Temp rise 150/125/105 °C; ADS-335; feature code B595; max surge kVA 312 |
| 380-480 | Wye | Temp rise 125/105 degrees C; Duty S/P; Max surge 2944 kVA; Winding No. 312; ADS-309; Feature code B282-2 | ||
| 400 | 3 | Wye | Winding 312; ADS-310; feature code BC36-2 | |
| 4160 | 3 | Wye, 3-phase | Winding no. 6307 | Temp rise 125/105/80 °C; ADS-324; feature code B467; max surge kVA 51 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What is the power rating of the Cummins/Onan DQCA?
The Cummins/Onan DQCA is rated 600 kW standby (750.0 kVA).
What engine is in the Cummins/Onan DQCA?
The Cummins/Onan DQCA is powered by the Cummins/Onan QSK23-G7 NR2 engine.
What kind of fuel does the Cummins/Onan DQCA run on?
The Cummins/Onan DQCA runs on Diesel.
What is the oil capacity of the Cummins/Onan DQCA?
The Cummins/Onan QSK23-G7 NR2 engine in the Cummins/Onan DQCA has an oil capacity of 102.0 liters.
What is the coolant capacity of the Cummins/Onan DQCA?
The Cummins/Onan DQCA cooling system holds 109.5 liters (28.9 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the continuous rating of the Cummins/Onan DQCA?
The Cummins/Onan DQCA is rated 545 kW prime (681 kVA), against 600 kW standby.
How loud is the Cummins/Onan DQCA?
The Cummins/Onan DQCA is rated at 74.1 dBA at 7 m, per the manufacturer specification sheet.
How much does the Cummins/Onan DQCA weigh?
The Cummins/Onan DQCA has a dry weight of 6075 kg (13393 lb).
What size fuel tank does the Cummins/Onan DQCA have?
The Cummins/Onan DQCA has a 120 liter (32 US gallon) fuel tank, giving about 8 hours of runtime.
What voltage does the Cummins/Onan DQCA produce?
The Cummins/Onan DQCA is offered in 110/190 V, 115/200 V, 120/208 V, 127/220 V, 139/240 V, 220/380 V, 3-phase.
What size battery does the Cummins/Onan DQCA need?
The Cummins/Onan DQCA uses 2 batteryies, 24 V each, 1400 CCA, group 8D, per the manufacturer specification sheet. The starting system is 24 V DC.
What alternator does the Cummins/Onan DQCA use?
The Cummins/Onan DQCA uses a Stamford/AvK HC634 alternator. It has 4 poles. Insulation class F.
What oil filter does the Cummins/Onan DQCA use?
The Cummins/Onan DQCA uses oil filter part number LF9325.
What fuel filter fits the Cummins/Onan DQCA?
The Cummins/Onan DQCA uses fuel filter part number FS1006.
What air filter does the Cummins/Onan DQCA use?
The Cummins/Onan DQCA uses air filter part number AF25544.
Troubleshooting
6Symptoms & remedies
| Symptom | Remedy |
|---|---|
| Battle Short Mode | If a bypassed shutdown fault occurs, the fault code and description will still be annunciated, but the genset will not shutdown. This will be followed by a fail to shutdown fault. |
| Derate | The derate function reduces output power of the genset in response to a fault condition. If a derate command occurs while operating on an isolated bus, the control will issue commands to reduce the load on the genset via contact closures or modbus. |
| Emergency Stop | Annunciated whenever either emergency stop signal is received from external switch. |
| Full Authority Electronic Engine Protection | Engine fault detection is handled inside the engine ECM. Fault information is communicated via the SAE-J1939 data link for annunciation in the HMI. |
| Low and high battery voltage warning | Indicates status of battery charging system (failure) by continuously monitoring battery voltage. |
| Weak battery warning | The control system will test the battery each time the generator set is signaled to start and indicate a warning if the battery indicates impending failure. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan DQCA troubleshooting guide (71 entries) →
Repair guides
2Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
14| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 501-0876 | Line, Fuel Cooler Return (Bearward Cooling System, not shown) | 1 | Hose | Amazon eBay |
| 501-0877 | Line, Fuel Supply (Engine Accessories group) | 1 | Hose | Amazon eBay |
| 501-0892 | Line, Fuel Cooler Supply (Bearward Cooling System, not shown) | 1 | Hose | Amazon eBay |
| 503-1675 | Hose, Reducer (Air Cleaner group) | 1 | Hose | Amazon eBay |
| 503-2754-01 | Hose, Oil | 1 | Hose | Amazon eBay |
| A053A190 | Hose, Oil (Valve group) | 1 | Hose | Amazon eBay |
| A055E534 | Switch, Level (low coolant level warning) | 1 | Sensor | Amazon eBay |
| A059Z452 | Seal, O Ring (Valve group) | 1 | Seal | Amazon eBay |
| AF2559300 | Air Cleaner replacement element (Nelson), for Air Cleaner Housing 140-3737 | 1 | Air filter | Amazon eBay |
| 140-1548 | Indicator, Service | 1 | Service part / kit | Amazon eBay $49.99 NAPA $32.16 |
| 204-009 | Acronyms and Abbreviations | Service part / kit | Amazon eBay | |
| 3822735 | Plastic bead blasting media | 1 | Service part / kit | Amazon eBay |
| 4021375 | QSK23 Troubleshooting and Repair Manual | 1 | Service part / kit | Amazon eBay |
| KS-E368R | Head Office | Service part / kit | Amazon eBay |
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 |
|---|---|---|---|
| Continuous | 25% | 45.4 | 12.0 |
| Continuous | 50% | 79.5 | 21.0 |
| Continuous | 75% | 113.6 | 30.0 |
| Continuous | 100% | 145.7 | 38.5 |
| Prime | 25% | 58.3 | 15.4 |
| Prime | 50% | 100.4 | 26.5 |
| Prime | 60% | 12.0 | 3.2 |
| Prime | 75% | 140.6 | 37.1 |
| Prime | 100% | 178.9 | 47.3 |
| Standby | 25% | 62.7 | 16.6 |
| Standby | 50% | 108.8 | 28.7 |
| Standby | 75% | 152.6 | 40.3 |
| Standby | 100% | 194.1 | 51.3 |
Available documents
Spec sheet — Cummins-DQCA-spec-sheet (Cummins/Onan)Spec sheet — New-Cummins-DQCB-submittal (Cummins/Onan)Spec sheet — New-Cummins-DQKAA-submittal (Cummins/Onan)Spec sheet — cummins-dqca-data-sheet-1772550880 (Cummins/Onan)Spec sheet — cummins-dqca-spec-sheet-1772550880 (Cummins/Onan)Spec sheet — s-1551 (Cummins/Onan)Reference — cummins-dqca-sn-d160945695-load-test-report-and-inspection-checklist-1776188235. (Cummins/Onan)Parts manual — 0961-0204 I17 201605 (Cummins/Onan)Parts manual — A056J197 I12 202505 (Cummins/Onan)
This page was generated from the 9 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.