Service parts for the DXCB
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Oil capacity | 11.5 L |
|---|---|
| Voltage options | 240 V, 254 V, 277 V |
| Battery voltage | 24 V |
| Battery quantity | 2 |
| Coolant capacity | 5.5 L |
| Max ambient | 40 °C |
| Fuel tank | 21.0 L |
Engine
| Oil capacity | 11.0 L |
|---|---|
| Coolant capacity | 21.0 L |
| Displacement | 3.92 L |
| Aspiration | Turbocharged |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan 4BT3.9G2| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter | 982-0200 | Amazon eBay |
Common questions
Which engine powers the Cummins/Onan DXCB?
The Cummins/Onan DXCB is powered by the Cummins/Onan 4BT3.9G2 engine.
What's the oil capacity on a Cummins/Onan DXCB?
The Cummins/Onan 4BT3.9G2 engine in the Cummins/Onan DXCB has an oil capacity of 11.0 liters.
How much coolant does the Cummins/Onan DXCB hold?
The Cummins/Onan DXCB cooling system holds 5.5 liters (1.5 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What size fuel tank does the Cummins/Onan DXCB have?
The Cummins/Onan DXCB has a 21 liter (6 US gallon) fuel tank.
What voltage does the Cummins/Onan DXCB produce?
The Cummins/Onan DXCB is offered in 240 V, 254 V, 277 V.
How many cold cranking amps does the Cummins/Onan DXCB require?
The Cummins/Onan DXCB uses 2 batteryies, 24 V each, per the manufacturer specification sheet.
What air filter does the Cummins/Onan DXCB use?
The Cummins/Onan DXCB uses air filter part number 982-0200.
Troubleshooting
6Fault codes
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 1 | Green RUN lamp lights following engine start-up | Indicates all engine systems are normal. No corrective action required. | |
| 2 | PREHI ENGINE TEMP lamp lights. Engine continues to operate | Indicates engine has begun to overheat and engine temperature has risen to approximately 220° F (105° C) | If generator is powering non-critical and critical loads, and cannot be shut down, use the following: a. Reduce load if possible by turning off non-critical loads; b. Check air inlets and outlets and remove any obstructions to airflow; c. Open doors or windows in generator area to increase ventilation. If engine can be stopped, follow procedure in step 3 |
| 3 | HI ENG TEMP lamp lights. Engine shuts down | Indicates engine has overheated (engine temperature has risen above 230° F/110° C) or coolant level is low (sets with coolant level sensor) | Allow engine to cool down completely before proceeding with the following checks: a. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary; b. Check for obstructions to cooling airflow and correct as necessary; c. Check for a slipping fan belt, tighten if loose; d. Reset control and restart after locating and correcting problem. Contact your distributor if none of the above applies |
| 4 | PRELO OIL PRES lamp lights. Engine continues to operate | Indicates engine oil pressure has dropped to 20 psi (138 kPa) | If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure. If engine can be stopped, follow procedure in step 5 |
| 5 | LO OIL PRES lamp lights. Engine shuts down. NOTE: See also Step 6 | Indicates engine oil pressure has dropped to 14 psi (97 kPa) | Check oil level, replenish as necessary. Check oil lines and filters for leaks, repair as required. Reset control and restart. Contact your distributor if oil pressure is not in the range of 35 to 55 psi (241 to 379 kPa) |
| 6 | OVERCRANK lamp lights and engine stops cranking. Or. Engine runs, shuts down, and LO OIL PRES lamp lights | Indicates possible fuel system problem | A. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required; b. Check for dirty fuel filter and replace if necessary (see MAINTENANCE section); c. Check for dirty or plugged air filter and replace if necessary (see MAINTENANCE section); d. Refer to step 5; e. Reset the control and restart after correcting the problem. Contact your distributor for service if none of the above applies |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan DXCB troubleshooting guide (18 entries) →
Parts
80| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 102-1147 | Gasket, Drain-Oil Pan | 1 | Gasket | Amazon eBay |
| 150-2007 | Guard. Belt Screw. Cap - Hex Head (1/2-13 X 2-1/4“) | 1 | Belt | Amazon eBay FridayParts $263.79 KuduParts $344.00 |
| 150-2201 | Sensor, Speed – Magnetic | 1 | Sensor | Amazon eBay $249.10 |
| 187-0001 | Pump, Water | 1 | Pump | Amazon eBay |
| 187-0002 | Gasket Kit, End - Top | 1 | Gasket | Amazon eBay |
| 187-0008 | Belt, Drive | 4 | Belt | Amazon eBay |
| 187-0009 | Belt, Drive | 4 | Belt | Amazon eBay |
| 187-0011 | Filter, Fuel | 1 | Fuel filter | Amazon |
| 187-0013 | Pump, Transfer-Fuel | Pump | Amazon eBay $100.99 | |
| 187-0018 | INJ. PUMP | Pump | Amazon eBay | |
| 187-0020 | Thermostat | 1 | Thermostat | Amazon eBay |
| 193-0244 | Sender, Oil Pressure (E1) | 1 | Sensor | Amazon eBay |
| 193-0353 | Sender, Temperature - Oil | 1 | Sensor | Amazon eBay |
| 193-0375 | Sender, Coolant | 1 | Sensor | Amazon eBay |
| 309-0269 | Sender, Temperature-Lo Engine | 1 | Sensor | Amazon eBay $239.00 |
| 309-0272 | Regulator, Voltage - 24 VDC (Used on 35 A MP Alternator) | 1 | Alternator | Amazon eBay |
| 309-0561 | Alternator & Drive Components Group Pulley. Alternator - Multi Groove (Use with 35 A MP Alternator) | 1 | Alternator | Amazon eBay |
| 328876800 | Belt, V-Grooved | 1 | Belt | eBay |
| 501-0441 | Line, Fuel - Flex (Fuel In) | 1 | Hose | Amazon eBay |
| 501-0502 | Line, Fuel-Flex (Fuel Out) | 1 | Hose | Amazon eBay |
| 503-0098 | Hose, Oil Drain - Bulk (Order By The Foot - 3 Feet Required) | 1 | Hose | Amazon eBay |
| 503-0183 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 503-0197 | Clip, Hose | 1 | Hose | Amazon eBay $7.99 |
| 503-0685 | Clamp, Hose | 1 | Hose | Amazon eBay $15.00 |
| 505-0059 | Sensor, Water Pressure | 1 | Sensor | Amazon eBay |
| 982-0200 | Air Filter | 6 | Air filter | Amazon eBay |
| REC149-2106 | By-pass filter I | 1 | Oil filter | Amazon eBay $18.20 |
| REC1491754 | By-pass filter II | 1 | Oil filter | Amazon eBay |
| 102-1237 | Adapter, Drain-Oil | 1 | Service part / kit | Amazon eBay |
| 151-0611 | Control, Governor | 1 | Service part / kit | Amazon eBay FridayParts $249.00 |
| 155-2175 | Clamp, Muffler 4" | 1 | Service part / kit | Amazon eBay |
| 187-0007 | INJ | Service part / kit | Amazon eBay | |
| 187-0012 | Filter, Fuel | 1 | Service part / kit | Amazon eBay $149.89 NAPA $17.15 |
| 187-0015 | Filter, Oil | 1 | Service part / kit | Amazon eBay $39.95 |
| 309-0553 | Switch, Temperature-Pre Water | 1 | Service part / kit | Amazon eBay $127.46 |
| 309-0554 | SWITCH WATER | 1 | Service part / kit | Amazon eBay $159.00 |
| 323-1200 | # Socket, Contact (Used in J1, J2) | 1 | Service part / kit | Amazon eBay |
| 323-1304 | tiotming, Umector | 1 | Service part / kit | Amazon eBay |
| 323-1306 | Genset component (SJB series) | 1 | Service part / kit | Amazon eBay |
| 332-0051 | Clamp, Loop | 1 | Service part / kit | Amazon eBay |
| 332-0941 | *Tie, Cable | 1 | Service part / kit | Amazon eBay |
| 332-1279 | Terminal. Lug - Ring (3/8 | 6 | Service part / kit | Amazon eBay |
| 332-1445 | Tie, Cable 18 98-5219 1 Decal - Panel Front (Not I l l u s t r a t e d ) 19 98-5220 1 Decal | 3 | Service part / kit | Amazon eBay |
| 332-2739 | Bracket | 1 | Service part / kit | Amazon eBay |
| 332-2921 | Switch, Temperature - Washer, Lock (M8) | 1 | Service part / kit | Amazon eBay |
| 357-0030 | Rectifier | 1 | Service part / kit | Amazon eBay $38.99 |
| 416-0446 | Cable, Battery - Jumper | 1 | Service part / kit | Amazon eBay |
| 504-0011 | Valve, Shutoff (1/2”) | 1 | Service part / kit | Amazon eBay $59.95 |
| 505-0026 | Coupling, Pipe (1/8") | 2 | Service part / kit | Amazon eBay |
| 505-0050 | Elbow, Street (1/2' x 90 ° ) | 1 | Service part / kit | Amazon eBay |
| 505-0098 | Band | 1 | Service part / kit | Amazon eBay |
| 505-0104 | Nipple, Pipe - Close | 1 | Service part / kit | Amazon eBay |
| 505-0185 | Nipple, Half (1/2' x 1.5' lg) | 1 | Service part / kit | Amazon eBay |
| 526-0008 | 148-036’? | 1 | Service part / kit | Amazon eBay |
| 526-0018 | Gasket, Flange (1-3/4) | 1 | Service part / kit | Amazon eBay |
| 526-0115 | Washer (5/16 “) | 1 | Service part / kit | Amazon eBay |
| 526-0196 | Washer, Spacer - Shield JC)INT, BALL LINKAGE | 0 | Service part / kit | Amazon eBay |
| 526-0327 | Control, Governor | Service part / kit | Amazon eBay | |
| 800-0012 | Screw, Cap - Hex Head (1/4-20 x 2-1/4”) Begin Spec C MANIFOLD KIT, INTAKE | 2 | Service part / kit | Amazon eBay |
| 800-2060 | Screw, Cap - Hex Head (M8x 1.25 x35) | 1 | Service part / kit | Amazon eBay |
| 800-2110 | Hood, Inlet - Air Molded | 1 | Service part / kit | Amazon eBay |
| 800-2112 | Screw. Cap - Hex Head (M12 x 30nin) | 2 | Service part / kit | Amazon eBay |
| 812-0075 | Screw-RHM(8-32xl/4) | 5 | Service part / kit | Amazon eBay |
| 813-0103 | Screw, Machine - Round Head (#10-32 x 3/4º) | 2 | Service part / kit | Amazon eBay $19.00 |
| 815-0172 | Cover, Adapter Outlet | 1 | Service part / kit | Amazon eBay |
| 850-0025 | Screw, Machine - Round Head (#8-32 x 3/8" ) | 2 | Service part / kit | Amazon eBay |
| 850-0030 | Washer, Lock - Spring (#10) | 1 | Service part / kit | Amazon eBay |
| 850-0050 | Washer, Lock - Spring (3/8”) | 2 | Service part / kit | Amazon eBay |
| 850-2006 | Washer, Lock - Spring (M6) | 1 | Service part / kit | Amazon eBay |
| 850-2008 | Washer, Lock (M8) | 1 | Service part / kit | Amazon eBay |
| 850-2012 | Washer, Lock - Spring (M12) | 3 | Service part / kit | Amazon eBay |
| 856-0013 | Washer, Lock - W/EIT (1/2) | 1 | Service part / kit | Amazon eBay |
| 860-2007 | Circuit Breaker Used With Westinghouse Circuit Breaker | 1 | Service part / kit | Amazon eBay |
| 870-0053 | Nut, Hex (s10-32) | 1 | Service part / kit | Amazon eBay |
| 870-0131 | Nut. Hex - with ET (#10-32) | 1 | Service part / kit | Amazon eBay |
| 870-0212 | Nut, Locking (1/4-20) | 2 | Service part / kit | Amazon eBay |
| 871-0010 | Nut, Hex - Srass (#10-32) Washer, Lock - EIT (#10) Washer, Lock - IT (#10) | 8 | Service part / kit | Amazon eBay |
| 871-0028 | NUT | 1 | Service part / kit | Amazon eBay |
| 960-0136 | Battery, 24V, 55Ah, AGM | 8 | Service part / kit | Amazon eBay |
| 965-0520 | Cooling Fan | 37 | 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.
Available documents
Service manual — 903-0121 Onan DT and DX Models 35-100kw Operators (5-1987) (Cummins/Onan)
This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.