Specifications
| Fuel | Diesel |
|---|---|
| Frequency | 50.0 Hz |
| Standby power | 180 kW |
| Standby kVA | 241 |
| Prime power | 163 kW |
| Oil capacity | 17.0 L |
| Voltage options | 12 V, 24 V |
| Coolant capacity | 26.0 L |
| Max ambient | 55.0 °C |
| Dimensions (L×W×H) | 1177×848×953 mm |
| Dry weight | 712 kg |
Engine
| Oil capacity | 17.0 L |
|---|---|
| Displacement | 8.3 L |
| Aspiration | Turbocharged, Aftercooled |
| Rated speed | 2500 rpm |
Maintenance & consumables
for the Cummins/Onan 6CTA8.3-M| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | AF4669 | PartsGeek | |||
| Fuel filter | 3843760 | PartsGeek | |||
| Oil filter | 3318853 | Amazon eBay $48.95 PartsGeek | |||
| Belt | 3911562 | PartsGeek | |||
| Coolant | 36.0 | — | |||
| Oil | Cummins Premium Blue 15W40 | 6.0 gal | 3377363 | PartsGeek |
Common questions
What is the power rating of the Cummins/Onan 6CTA8.3?
The Cummins/Onan 6CTA8.3 is rated 180 kW standby (241.0 kVA).
What engine does the Cummins/Onan 6CTA8.3 use?
The Cummins/Onan 6CTA8.3 is powered by the Cummins/Onan 6CTA8.3-M engine.
What fuel does the Cummins/Onan 6CTA8.3 use?
The Cummins/Onan 6CTA8.3 runs on Diesel.
What is the oil capacity of the Cummins/Onan 6CTA8.3?
The Cummins/Onan 6CTA8.3-M engine in the Cummins/Onan 6CTA8.3 has an oil capacity of 17.0 liters.
Troubleshooting
18Fault codes
| Code | Meaning |
|---|---|
| 31 | Engine will not shut off |
| 38 | Excessive engine moisture |
| 86 | Excessive fuel consumption |
| 387 | Excessive vibration |
| 80 | Exhaust smoke excessive under load |
| 338 | Knock |
| 29 | Fuel or oil leaking from exhaust manifold |
| 35 | Low power |
Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine does not crank. | Switch off indicator lamp flashing. Other fault indicator lamps illuminated, but no fault exists. No indication. Run/Stop/Remote switch in Stop position. Lamp Reset switch not actuated after a previous fault was remedied. Fuses blown on ECM board A11. Starter solenoid will not energize. Faulty ECM board A11. Time delay start is initiated, but starter solenoid does not energize after desired time delay period. | Press Lamp Reset switch to de-energize fault lamp relays of ECM, after Run/Stop/Remote switch is pressed to Stop position. Check fuses FI and F4. Replace if necessary with proper fuse: FI - 20 Ampere; F4 - 5 Ampere. Inspect starter solenoid per proper test procedure. Possible defective ECM board A11. Check A11 board TB1-9 for B+ voltage in. Broken wiring or poor connections between board A11 TB1-8 and starter solenoid. With SI 2 switch in Run position, check for voltage out to starter solenoid at TB1-8 of board A11. Check and repair as necessary. Time delay start is initiated, but starter solenoid does not energize after desired time delay period. Possible defective Time Delayed Start/Stop Module A15. If there is no voltage between TB1-8 and ground stud when the panel switch is in the Run position, the ECM is faulty. Replace. Check A15 board TB1-4 for constant B+ voltage in. Check a15 board TB1-5 for Run Signal In voltage. Voltage at A15 board TB1-6 should be at B+ at end of start delay period. Check wiring and connections from A15TB1-6 to A11 TB1-6. |
| Engine cranks, but does not start. | Overcrank lamp lit. Low Fuel lamp also lit. Insufficient fuel in supply tank. Fuel solenoid does not energize. Fuse blown on ECM board A11. Possible defective ECM board A11. Fuel solenoid energizes, but no fuel flows. Blockage of fuel supply system. Engine hard to start due to cold ambient air temperature. Heater system not keeping engine warm. | Fill with correct fuel. Check fuse F2. Replace if necessary. F2 - 20 Ampere. Check for voltage out at TB1-10 when engine is cranking. Broken wiring or poor connections between board All TBI-IO and fuel solenoid. Check and rectify as necessary. Blockage of fuel supply system. Check fuel supply system (fuel supply tank, shutoff valves, lines and connections, filters and transfer pump, etc.). Engine hard to start due to cold ambient air temperature. Heater system not keeping engine warm. Check heater system power supply, controls, etc., and correct as necessary. |
| Engine starts, but stops after running short time. | Overspeed lamp lit. Mechanical O.S. Switch or Overspeed Module (if equipped) initialized shutdown. Unstable engine operation. Low Oil Pressure lamp lit. Low oil level in engine. LOP switch faulty. High Engine Temperature lamp lit. Low coolant level in engine. HET switch is faulty. Thermostat defective. Fan belt slipping. | Refer to Tests and Adjustments section. Perform necessary adjustments of O.S. switch or module. Perform start-up and monitor engine speed to overspeed shutdown. If shutdown occurs before desired setpoint, readjust O.S. switch/module. If adjustment does not correct fault condition, replace O.S. switch/module. Replenish as necessary. Check oil level, perform restart, and monitor oil pressure gauge. If gauge reading is within normal range, switch S1 is faulty. Replace. Replenish as necessary. Check coolant level, perform restart, and monitor engine temperature. |
| LOP, HET, Overspeed lamp lit. | As indicated. | Refer to Table 4-3. |
| Fault 1 or Fault 2 Over/Under Voltage or Frequency, as dedicated by customer. Restart unit and monitor gauges. | If shutdown was due to over/under voltage, the voltage regulator may require adjustment or is faulty. Refer to Tests and Adjustments section for adjustments, replace if faulty. If shutdown was due to over/under frequency, the engine governor may require adjustment or is faulty. Refer to Tests and Adjustments section for adjustments, replace if faulty. | Refer to Tests and Adjustments section. Restart unit and monitor gauges. |
| No fault lamp lit. | Possible defective ECM | Check fuses F4 and F2 of ECM board A11. F4 (Main) - 5 Ampere F2 (Fuel solenoid or ignition) - 20 Ampere Perform restart and check for B+ voltage in at TB1-9 and voltage out at TB1-10 to fuel solenoid. If there is voltage out at TB1-10, check fuel supply solenoid, shutoff valves, etc. If there is no voltage out at TB1-10, ECM board A11 is defective. Replace. |
| Is field breaker CB21, if equipped, at ON (fully-in) position? | Replace defective field breaker. Remove one lead from breaker and check continuity with ohmmeter. Is breaker open? Place breaker switch to ON position. Does voltage is unstable, high or low, or causes generator AC output voltage build up? If breaker to trip, refer to other Flow Charts. | |
| Is residual voltage across TB21-22 and -23 equal to 5 to 10 VAC or more? | Yes: Is exciter field voltage across VR21-X and -XX at approximately 24 to 32 VDC? No: Check exciter field wiring for shorts. Replace bad wiring. Check exciter field wiring for opens. Replace bad wiring. Replace voltage regulator VR21. Check exciter field winding. Replace if bad. | |
| Are there any broken wires or loose connections on voltage regulator assembly? | Yes: Repair as required. Check control panel voltage adjust rheostat and replace if defective (open). No: Check wiring harness from regulator assembly to end bell. Check ok? No: Repair wiring or replace as required. Yes: Check voltage regulator adjustment setting. Check ok? | |
| Is engine running at correct rpm? | No: Refer to Governor Adjustments. Yes: Are generator output connections correct and secure? No: Refer to appropriate electrical schematic. Yes: Does adjustment of Voltage Adjust control R21 (if equipped) result in correct output voltage? No: Set Voltage Adjust control R21. Check voltage adjust rheostat and replace if defective. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
138| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 102-1356 | Gasket, Oil Drain | Gasket | PartsGeek | |
| 140-2240 | Cleaner, Air - Includes Element(s) | 1 | Air filter | PartsGeek |
| 140-2241 | Element, Air Cleaner - Standard (Outer) | 1 | Air filter | PartsGeek |
| 140-2252 | Element, Air Cleaner - Heavy Duty (Inner) | 1 | Air filter | PartsGeek |
| 155-3150-04 | Muffler, Critical | 1 | Muffler | PartsGeek |
| 155-3164-01 | Pipe, Exhaust | 1 | Pipe | PartsGeek |
| 193-0244 | Sender, Oil Pressure (E1) | Sensor | PartsGeek | |
| 193-0353 | Sender, Temperature - Oil | Sensor | PartsGeek | |
| 193-0375 | # Sender, Water Temperature | Sensor | PartsGeek | |
| 193-0448 | Sender, Oil Pressure (Includes Parts Marked *) | 1 | Sensor | PartsGeek |
| 3016627 | Alternator, 24V | As needed | Alternator | PartsGeek FridayParts $175.24 |
| 3016628 | Alternator, 12V | As needed | Alternator | PartsGeek |
| 308-0913 | Kit, Repair - Fuel Tank Pump (includes Lip Seal, Bearings, Gasket, Drive Gear, Idle Gear, Coupler) | 1 | Pump | PartsGeek |
| 309-0269 | Air Cleaner (Includes Element) - Standard | Air filter | PartsGeek ironwing $32.86 | |
| 309-0553 | Switch, Temperature - Low Engine Coolant (S4) | 1 | Sensor | PartsGeek |
| 309-0554 | Switch, Oil Pressure - 20 PSI (S5 Pre-Alarm) | 1 | Sensor | PartsGeek |
| 319-2653 | Window, Control (If Equipped) | 1 | Window | PartsGeek |
| 3318853 | Lube Filter (Fleetguard LF3000 equivalent) | 1 | Oil filter | Amazon eBay $48.95 PartsGeek |
| 3377363 | Lube Oil, Cummins Premium Blue 15W40 (one-gallon jugs) | 6 Gal. | Fluid | PartsGeek |
| 3837348 | Cleaner, Air (replacement element, Air-Cleaner group AC9055-01) | 1 | Air filter | PartsGeek |
| 3843760 | Fuel Filter (Fleetguard FS1251 equivalent) | 1 | Fuel filter | PartsGeek |
| 3907177 | Seal, Rectangular Ring (Cylinder-Block group BP97003) | 1 | Seal | PartsGeek |
| 3908139 | Front Seal Service Kit, includes installation tools (Front-Gear-Cover group BP9733-04) | 1 | Seal | PartsGeek |
| 3911562 | Belt | As needed | Belt | PartsGeek |
| 3913994 | Seal, O Ring (Front-Gear-Cover group BP9733-04) | 1 | Seal | PartsGeek |
| 3914303 | Gasket, Gear Housing (Front-Gear-Cover group BP9733-04) | 1 | Gasket | PartsGeek |
| 3915772 | Seal, Rectangular Ring (Front-Gear-Cover group BP9733-04) | 1 | Seal | PartsGeek |
| 3917779 | Gasket, Gear Cover (Front-Gear-Cover group BP9733-04) | 1 | Gasket | PartsGeek |
| 3921402 | Starter, 12V | As needed | Starter | PartsGeek |
| 3921403 | Starter, 24V | As needed | Starter | PartsGeek |
| 399-0117 | Pump, Fuel Tank (P103) | 1 | Pump | PartsGeek |
| 405-5744 | Post, Housing - Center | 4 | Post | PartsGeek |
| 405-5832 | Door, Housing | 6 | Door | PartsGeek |
| 405-5908 | Panel, Side - Radiator Housing | 2 | Panel | PartsGeek |
| 405-5916 | Post, Corner - Housing | 2 | Post | PartsGeek |
| 405-5917 | Panel, End - Roof | 2 | Panel | PartsGeek |
| 406-0831 | Hinge, Door | 14 | Hinge | PartsGeek |
| 502-0047 | Nipple, Pipe (1/4) | 1 | Nipple | PartsGeek |
| 503-0183 | Clamp, Hose | 1 | Sensor | PartsGeek |
| 503-0365 | Clamp, Hose | Hose | PartsGeek | |
| 503-0446 | Clamp, Hose | 4 | Clamp | PartsGeek |
| 503-0465 | Clamp, Hose | Hose | PartsGeek | |
| 503-0685 | Clamp, Hose | Hose | PartsGeek | |
| 503-1595 | Hose | Hose | PartsGeek | |
| 503-1599 | Hose, Radiator | Hose | PartsGeek | |
| 526-0451 | Washer, Flat - Stainless Steel (M8) | 2 | Washer | PartsGeek |
| 821-0018 | Thermostat (Includes Plugs) | Thermostat | PartsGeek | |
| 821-6003-02 | Screw, Cap - Hex Head | 2 | Screw | PartsGeek |
| 870-0257 | Nut, Locking (5/16−18) * − Parts Used On Heat Exchanger Installations With Automatic Water Regulator # − Cut Off And Discard Swivel Connector End Of Hose So That 1/8 NPT Connector End Measures Length As Indicated Above + − Parts Used On Heat Exchanger Installations Without Automatic Water Regulator | Hose | PartsGeek | |
| AF4669 | Air Cleaner (6CTA8.3-F, Fleetguard) | 1 | Air filter | PartsGeek |
| 102-1237 | Adapter, Oil Drain (Ml8 x 1/2") (S2) | Service part / kit | PartsGeek | |
| 130-3208 | Service part / kit | PartsGeek | ||
| 130-3209 | Service part / kit | PartsGeek | ||
| 130-3212 | Part 130-3212 | Service part / kit | PartsGeek | |
| 130-3216 | Part 130-3216 | Service part / kit | PartsGeek | |
| 130-3217 | Service part / kit | PartsGeek | ||
| 130-3218 | Service part / kit | PartsGeek | ||
| 140-1260 | Fitting, Safety Filter | Service part / kit | Amazon eBay $35.00 PartsGeek | |
| 140-1548 | Service part / kit | Amazon eBay $91.60 PartsGeek | ||
| 140-1601 | Service part / kit | PartsGeek | ||
| 140-1973 | Service part / kit | PartsGeek | ||
| 140-2238 | Service part / kit | PartsGeek | ||
| 140-2239 | Service part / kit | PartsGeek | ||
| 140-2251 | Cleaner, Air (Includes Elements) | Service part / kit | PartsGeek | |
| 150-2252 | Service part / kit | PartsGeek | ||
| 155-2304 | Service part / kit | PartsGeek | ||
| 155-2307 | Silencer | Service part / kit | PartsGeek | |
| 191-19830 | Service part / kit | PartsGeek | ||
| 191-2038 | Service part / kit | PartsGeek | ||
| 309-0561 | Service part / kit | PartsGeek | ||
| 332-1473 | Part 332-1473 | Service part / kit | PartsGeek | |
| 332-2738 | Service part / kit | PartsGeek | ||
| 402-0030 | Part 402-0030 | Service part / kit | PartsGeek | |
| 403-2690 | Service part / kit | PartsGeek | ||
| 416-0444 | Cable, Battery - Negative | Service part / kit | PartsGeek | |
| 416-0619 | Service part / kit | PartsGeek | ||
| 501-0441 | Line, Fuel - Flex (Fuel In) | Service part / kit | PartsGeek | |
| 501-0480 | Line, Fuel - Flex (Fuel Out) | Service part / kit | PartsGeek | |
| 503-0099 | Service part / kit | PartsGeek | ||
| 503-0197 | Service part / kit | PartsGeek | ||
| 503-1354 | Service part / kit | PartsGeek | ||
| 503-1586 | Service part / kit | PartsGeek | ||
| 503-1870 | Service part / kit | PartsGeek | ||
| 504-0011 | Valve, Shutoff (1/2”) | Service part / kit | PartsGeek | |
| 505-0021 | Bushing, Pipe - Reducer (3/4º to 1/2º) | Service part / kit | PartsGeek | |
| 505-0050 | Nut, Cap - Hex Head (#10-32 x 30mm) | Service part / kit | PartsGeek | |
| 505-0185 | Service part / kit | PartsGeek | ||
| 505-1373 | Service part / kit | PartsGeek | ||
| 508-0015 | Service part / kit | PartsGeek | ||
| 508-0231 | Service part / kit | PartsGeek | ||
| 517-0138 | Service part / kit | PartsGeek | ||
| 526-0003 | 1 “Panel, Top + So 26 405~ “1872 16 | Service part / kit | PartsGeek | |
| 526-0008 | Service part / kit | PartsGeek | ||
| 526-0141 | Service part / kit | PartsGeek | ||
| 526-0219 | Washer, Flat (1/2) | Service part / kit | PartsGeek | |
| 526-2140 | Service part / kit | PartsGeek | ||
| 600-2124 | Service part / kit | PartsGeek | ||
| 660-2008 | Service part / kit | PartsGeek | ||
| 718-1026 | Service part / kit | PartsGeek | ||
| 800-0008 | Connector | Service part / kit | PartsGeek | |
| 800-0026 | Screw, Cap - Hex Head - Cushion Mounting | Service part / kit | PartsGeek | |
| 800-0091 | Service part / kit | PartsGeek | ||
| 800-0520 | Screw, Cap - Hex Head - Self Locking 3/4-10 x 1" | Service part / kit | PartsGeek | |
| 800-2058 | Part 800-2058 | Service part / kit | PartsGeek | |
| 800-2088 | Service part / kit | PartsGeek | ||
| 800-2096 | Service part / kit | PartsGeek | ||
| 800-2110 | Hood, Inlet - Air Molded | Service part / kit | PartsGeek | |
| 800-2111 | Screw, Cap - Hex Head (M12 x 10mm) | Service part / kit | PartsGeek | |
| 809-0035 | Screw, Tapping - Roundhead | Service part / kit | PartsGeek | |
| 815-0115 | Service part / kit | PartsGeek | ||
| 815-0172 | Cover, Adapter Outlet | Service part / kit | PartsGeek | |
| 818-0150 | Service part / kit | PartsGeek | ||
| 821-0014 | Screw, self-locking - Hex Head | Service part / kit | PartsGeek | |
| 821-0029 | Screw, Self–Locking – Hex Washer Head (3/8–16 x 3/4") | Service part / kit | PartsGeek | |
| 830-2008 | Service part / kit | PartsGeek | ||
| 850-0030 | Washer, Lock - Spring (#10) | Service part / kit | PartsGeek | |
| 850-0060 | Washer, Lock - Spring | Service part / kit | PartsGeek | |
| 850-2005 | Washer, Lock - Spring (M5) | Service part / kit | PartsGeek | |
| 850-2008 | Heater, Engine Coolant | 1 | Service part / kit | PartsGeek |
| 850-2010 | 6 Residential and Critical (M10) | Service part / kit | PartsGeek | |
| 850-2012 | Washer, Lock - Spring (M12) | Service part / kit | PartsGeek | |
| 856-0008 | Washer (5/ 16 “),Shakeprcmf EIT | Service part / kit | PartsGeek | |
| 856-0013 | Service part / kit | PartsGeek | ||
| 860-2006 | Service part / kit | PartsGeek | ||
| 862-0004 | 4 ttNut, Hex - Set Mounting - Key 2 HARDWARE SET, SET MOUNTING | Service part / kit | PartsGeek | |
| 862-0016 | Nut, Hex | Service part / kit | PartsGeek | |
| 863-0002 | Cleaner, Air (Includes Element) | Service part / kit | PartsGeek | |
| 870-0048 | Nut, Self-locking | Service part / kit | PartsGeek | |
| 870-0053 | Service part / kit | PartsGeek | ||
| 870-0196 | Nut, Insulated | Service part / kit | PartsGeek | |
| 870-0212 | Nut, Locking (1/4-20) | Service part / kit | PartsGeek | |
| 870-0281 | Nut, Self-Locking – Hex Washer Head (3/8–16) | Service part / kit | PartsGeek | |
| 871-0010 | ENut, Hex (10-32) ‘853-0006 Elackwasher 526-004$ | Service part / kit | PartsGeek | |
| 928-0502B | Service part / kit | PartsGeek | ||
| 928-0506 | Service part / kit | PartsGeek | ||
| 960-0504A | Service part / kit | PartsGeek | ||
| 960-0505 | Service part / kit | PartsGeek | ||
| 960-12 | 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 |
|---|---|---|---|
| Base | 25% | 10.0 | 2.9 |
| Base | 50% | 20.0 | 5.3 |
| Base | 75% | 30.0 | 7.9 |
| Continuous | 100% | 32.0 | 8.5 |
| Prime | 18% | 1.63 | |
| Prime | 25% | 3.09 | |
| Prime | 30% | 15.9 | |
| Prime | 37% | 5.15 | |
| Prime | 50% | 23.7 | |
| Prime | 70% | 34.4 | |
| Prime | 75% | 12.8 | |
| Prime | 100% | 50.9 | |
| Prime | 150% | 41.6 | |
| Prime | 200% | 69.7 | |
| Standby | 100% | 45.0 | 11.9 |
Available documents
Engine spec — 0043216 (Cummins/Onan)Engine spec — 0057290 (Cummins/Onan)Engine spec — 4000073 0703 (Cummins/Onan)Spec sheet — 6CTA8.3-G2 (Cummins/Onan)Spec sheet — 6CTA83-G2 1 (Cummins/Onan)Spec sheet — fr90608 (Cummins/Onan)Parts manual — 6cfparts (Cummins/Onan)Service manual — 904-0501 Onan 4BT 6BT 6CT 6CTA Series Genset Service manual 04-1989 text (Cummins/Onan)Service manual — Cummins Diesel C Series Manual 1988 (2) (Cummins/Onan)