Service parts for the DXBA
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 | 11.5 L |
|---|---|
| Coolant capacity | 21.0 L |
| Displacement | 3.92 L |
| Aspiration | naturally aspirated |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan 4B3.9-G| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter | 982-0200 | Amazon eBay | ||
| Fuel filter | Spin-on paper element fuel filters | — | |||
| Oil filter | Spin-on full flow lube oil filter | — | |||
| Battery | Lead acid batteries, cable and fitted tray | — | 180 hr | ||
| Belt | Dual flexible fuel lines and connectors | — | 250 hr | ||
| Coolant | — | ||||
| Coolant filter | — | ||||
| Oil | Change the oil and filter at the intervals recommended in the Maintenance Table. | — | |||
| Spark plug | Spark plugs | ×1 | — |
Common questions
Which engine powers the Cummins/Onan DXBA?
The Cummins/Onan DXBA is powered by the Cummins/Onan 4B3.9-G engine.
What's the oil capacity on a Cummins/Onan DXBA?
The Cummins/Onan 4B3.9-G engine in the Cummins/Onan DXBA has an oil capacity of 11.5 liters.
What air filter does the Cummins/Onan DXBA use?
The Cummins/Onan DXBA uses air filter part number 982-0200.
Troubleshooting
6Symptoms & remedies
| Symptom | Remedy |
|---|---|
| Green RUN lamp lights following engine Start-up. | Indicates all engine systems are normal. No corrective action required. |
| 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. |
| 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. |
| 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. |
| LOOIL PRES lamp lights. Engine shuts down. | 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). |
| OVERCRANK lamp lights and engine stops cranking. | Indicates possible fuel system problem. a. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. Engine runs, shuts down, and LO OIL PRES lamp lights. 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 DXBA troubleshooting guide (18 entries) →
Parts
2| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 982-0200 | Air Filter | 6 | Air filter | 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)