Service parts for the NT855
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredBelts
1 requiredElectrical
1 requiredIgnition
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | diesel |
|---|---|
| Frequency | 50.0 Hz |
| Standby power | 280 kW |
| Standby kVA | 350 |
| Prime power | 256 kW |
| Oil capacity | 39.7 L |
Engine
| Oil capacity | 39.7 L |
|---|---|
| Coolant capacity | 19.0 L |
| Displacement | 14.0 L |
| Aspiration | Turbocharged |
| Rated speed | 1500 rpm |
Filters for the Cummins/Onan NT855-G6
8Engine-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 | |
|---|---|---|---|---|
| Oil filter | P551670 | Lube Filter, Spin-On Full Flow | CUMMINS 298670, CUMMINS 299670, NAPA 1970, CARBOCOL 0026 | FridayParts $26.68 |
| Oil filter | P550777 | Lube Filter, Spin-On Bypass | CUMMINS 3021658, CUMMINS 33004232, NAPA 1749, BALDWIN B7577 | FridayParts $43.56 |
| Fuel filter | P550105 | Fuel Filter, Spin-On Primary | CUMMINS 154700, CUMMINS 154710, NAPA 3109, NAPA 3405 | buy |
| Fuel filter | P557440 | Fuel Filter, Spin-On Secondary | CUMMINS BM78672, BALDWIN BF970, LPM 00013505994, WALGAHN-MOTORENTECHN 00811464 | FridayParts $189.69 |
| Fuel / water separator | P550106 | Fuel Filter, Water Separator Spin-On | CUMMINS 154789, CUMMINS 156164, NAPA 3405, BALDWIN BF957-D | FridayParts $285.60 |
| Fuel / water separator | P558000 | Fuel Filter, Water Separator Spin-On Twist&Drain | CUMMINS 3308638, CUMMINS 3308683, NAPA 3405, NAPA 3693 | KuduParts $24.00 FridayParts $25.66 |
| Coolant filter | P554071 | Coolant Filter, Spin-On | CUMMINS 209604, CUMMINS 209606, NAPA 4071, WALGAHN-MOTORENTECHN 00811412 | FridayParts $397.60 |
| Coolant filter | P554073 | Coolant Filter, Spin-On | CUMMINS 209605, CUMMINS 209607, NAPA 4073, VERSATILE 00104040 | KuduParts $40.00 |
Maintenance & consumables
for the Cummins/Onan NT855-G6| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | 123459 | 200 hr | Amazon eBay | ||
| Fuel filter | 123458 | 200 hr | Amazon eBay | ||
| Oil filter | 123457 | 200 hr | Amazon eBay $17.99 | ||
| Battery | 123462 | 200 hr | Amazon eBay | ||
| Belt | 123461 | 200 hr | Amazon eBay $18.95 | ||
| Coolant | 16.5 Liters | 123460 | 200 hr | Amazon eBay | |
| Coolant filter | B342-1 | 2 hr | Amazon eBay | ||
| Oil | 11.2 Liters | — | 200 hr | ||
| Spark plug | 123463 | 200 hr | Amazon eBay |
Service intervals
2| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| valve clearance | Check | 2000 hr | B-Series (4BT3.3): valve clearance checks not required for 2000 hours, twice the industry standard | |
| engine overhaul | Other | 20000 hr | QSK23-Series: expected life cycle to 20,000 hours before first overhaul |
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 NT855?
The Cummins/Onan NT855 is rated 280 kW standby (350.0 kVA).
What engine does the Cummins/Onan NT855 use?
The Cummins/Onan NT855 is powered by the Cummins/Onan NT855-G6 engine.
What kind of fuel does the Cummins/Onan NT855 run on?
The Cummins/Onan NT855 runs on diesel.
How much oil does the Cummins/Onan NT855 take?
The Cummins/Onan NT855-G6 engine in the Cummins/Onan NT855 has an oil capacity of 39.7 liters.
What is the cooling system capacity of the Cummins/Onan NT855?
The Cummins/Onan NT855 cooling system holds 19 liters (5.0 US gallons) for the engine, per the manufacturer specification sheet.
What is the prime power rating of the Cummins/Onan NT855?
The Cummins/Onan NT855 is rated 256 kW prime (320 kVA), against 280 kW standby.
Which oil filter part number does the Cummins/Onan NT855 take?
The Cummins/Onan NT855 uses oil filter part number 123457.
Which fuel filter part number does the Cummins/Onan NT855 take?
The Cummins/Onan NT855 uses fuel filter part number 123458.
What air filter fits the Cummins/Onan NT855?
The Cummins/Onan NT855 uses air filter part number 123459.
Parts
60| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 140-2389 | 140-2391 1 140-2390 1 140-2392 1 140-2393 1 140-1548 1 140-1545 1 c 503-1575 186917 C | 1 | Air filter | Amazon eBay |
| 140-2391 | Element - Air Cleaner (Standard) | 1 | Air filter | Amazon eBay |
| 191-1858 | Starter (24VDC) | 1 | Starter | Amazon eBay |
| 191-1982 | Pulley, Alternator | 1 | Alternator | Amazon eBay FridayParts $40.00 |
| 191-1983-02 | Alternator, 24 Volt Spec B-O (Prestolite) | 1 | Alternator | Amazon eBay |
| 193-0447-01 | Sender, Water Temperature (E2) | 1 | Sensor | Amazon eBay |
| 193-0448 | Sender, Oil Pressure | 1 | Sensor | Amazon eBay |
| 309-0269 | Sender, Temperature-Lo Engine | 1 | Sensor | Amazon eBay $239.00 |
| 309-0576 | Switch, Thermostat - High Engine Coolant Temperature (S2) | 1 | Sensor | Amazon eBay |
| 309-0641-03 | Switch, Oil Pressure (Closes at 14 lbs. Descending) (S1) | 1 | Sensor | Amazon eBay |
| 309-0641-07 | Switch, Oil Pressure (Closes at 20 lbs. Descending) | 1 | Sensor | Amazon eBay |
| 502-0827 | Fitting, Hose – Barbed (1/2” ID Pipe to 3/4” ID Hose) | 2 | Hose | Amazon eBay |
| 503-0189 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 503-1634-01 | Hose, Rubber (3/4” ID x 4”) | 4 | Hose | Amazon eBay |
| 511-0092 | Belt, Alternator | 1 | Belt | Amazon eBay $13.97 NAPA $23.51 |
| B-342-3s | PRIMING TURBOCHARGER OIL SUPPLY INLET LINE. DISCONNECT AT THIS POINT TO PRIME | Turbocharger | Amazon eBay | |
| CS-1382c | INLET AIR DAMPER | Air filter | Amazon Amazon eBay eBay | |
| DM-3010461 | Crankshaft Rear Seal - NT855, NTC855 | 1 | Seal | Amazon eBay |
| ES-1214-2 | FLOAT SWITCH | Air filter | Amazon eBay | |
| FP-3013591 | Piston Cooling Nozzle | 6 | Injector | eBay |
| FP-3019158 | Gasket, Water Outlet | 1 | Gasket | eBay |
| FP-3020943 | Gasket, Exhaust Manifold | 6 | Gasket | eBay |
| FP-3024709 | Seal Ring, Water Manifold | 6 | Seal | eBay |
| FP-3054058 | Injector, New | Injector | eBay | |
| FP-3054250 | Injector, New | Injector | eBay | |
| FP-3076489 | Thermostat | 1 | Thermostat | eBay |
| FP-AR10172 | Pump, Oil (New) | 1 | Pump | eBay |
| FP-KS12622A | NH/NT855 In-Frame Kit w/upper gasket set & oil pan gasket | 1 | Gasket | Amazon eBay |
| FP-KS12622C | NH/NT855 In-Frame Kit w/upper gasket set & oil pan gasket | 1 | Gasket | Amazon eBay |
| FP-KS12622C7 | NH/NT855 In-Frame Kit w/upper gasket set & oil pan gasket | 1 | Gasket | Amazon eBay |
| FP-KS12622D | NH/NT855 In-Frame Kit w/upper gasket set & oil pan gasket | 1 | Gasket | Amazon eBay |
| FS1803s | FUEL FILTERS | Fuel filter | Amazon eBay | |
| M-4024945 | Edge molded rubber head gaskets set | Gasket | Amazon eBay | |
| 130-3588 | Cap, Radiator | 1 | Service part / kit | Amazon eBay $79.00 |
| 130-4355 | Radiator (2 Row Core) DFBJ | 1 | Service part / kit | Amazon eBay |
| 130-4355-01 | Radiator (3 Row Core) DFCF, DFCG | 1 | Service part / kit | Amazon eBay |
| 130-4369 | Radiator DFCH | 1 | Service part / kit | Amazon eBay |
| 155-2409-01 | Elbow, Exhaust (5" OD With Threads) | 1 | Service part / kit | Amazon eBay |
| 191-1981 | Genset component (SJB series) | 1 | Service part / kit | Amazon eBay |
| 191-2121 | Regulator, Voltage | 1 | Service part / kit | Amazon eBay |
| 333-0639-01 | Heater, Coolant (4990 Watt) | 1 | Service part / kit | Amazon eBay |
| 333-0639-02 | Heater, Coolant (6420 Watt) | 1 | Service part / kit | Amazon eBay |
| 503-1575 | Clamp, V-Band | 1 | Service part / kit | Amazon eBay |
| 504-0011 | Valve, Shutoff (1/2”) | 1 | Service part / kit | Amazon eBay $59.95 |
| EXS-1046s | CONDENSATION TRAP | Service part / kit | Amazon Amazon eBay eBay | |
| FP-855PREM | NH/NT855 Premium Cylinder Kits | 1 | Service part / kit | Amazon eBay |
| FP-855TT | NT855 Premium 3-Ring Cylinder Kits | 1 | Service part / kit | Amazon eBay |
| FP-855TTDN | NT855 Premium 3-Ring Cylinder Kits Dual-NI Pistons | 1 | Service part / kit | Amazon eBay |
| FP-855TTP | NT855 Premium Plus 3-Ring Cylinder Kits | 1 | Service part / kit | Amazon eBay |
| FP-855TTPDN | NT855 Premium Plus 3-Ring Cylinder Kits Dual-NI Pistons | 1 | Service part / kit | Amazon eBay |
| FP-IFK855NR | NT855 Cylinder Kits w/ no piston rings | 1 | Service part / kit | Amazon eBay |
| FP-IFK855PREM | NH/NT855 Premium Cylinder Kits | 1 | Service part / kit | Amazon eBay |
| FP-IFK855TT | NT855 Premium 3-Ring Cylinder Kits | 1 | Service part / kit | Amazon eBay |
| FP-IFK855TTDN | NT855 Premium 3-Ring Cylinder Kits Dual-NI Pistons | 1 | Service part / kit | Amazon eBay |
| FP-IFK855TTP | NT855 Premium Plus 3-Ring Cylinder Kits | 1 | Service part / kit | Amazon eBay |
| FP-IFK855TTPDN | NT855 Premium Plus 3-Ring Cylinder Kits Dual-NI Pistons | 1 | Service part / kit | Amazon eBay |
| FP-KS12621C | NH/NT855 Cylinder Kit Std Head Gask Grommets | 1 | Service part / kit | Amazon eBay |
| FP-KS12621C7 | NH/NT855 Cylinder Kit .010 Head Gask Grommets | 1 | Service part / kit | Amazon eBay |
| FS1692s | FUEL SOLENOID VALVE LOCATION | Service part / kit | Amazon eBay | |
| M-1808 | DC CONTROL WIRING | Service part / kit | Amazon Amazon eBay 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.
Available documents
Engine spec — 0057333 (Cummins/Onan)Engine spec — fr1399 (Cummins/Onan)Engine spec — fr1419 (Cummins/Onan)Spec sheet — NT855-G6 (Cummins/Onan)Reference — CUMMINS-GENERATOR-ENGINES-CATALOG (Cummins/Onan)Reference — Schedule Technical2012 (Cummins/Onan)
This page was generated from the 6 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.