Service parts for the ED series
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
Ratings spec sheet not in our library yet — see the documents below.
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Clean air cleaner cap and sump every 50 hours, clean air cleaner sump and filter element every 10 hours. | — | 6000 hr | ||
| Fuel filter | — | 6000 hr | |||
| Oil filter | Oil level gauge marks | 4305-3 | Amazon eBay | ||
| Battery | Check battery electrolyte level and state of charge every 100 hours. | — | 12500 hr | ||
| Belt | — | 6000 hr | |||
| Coolant | — | 12500 hr | |||
| Coolant filter | — | ||||
| Oil | — | 6000 hr | |||
| Spark plug | — | 6000 hr |
Common questions
What oil filter does the Cummins/Onan ED series use?
The Cummins/Onan ED series uses oil filter part number 4305-3.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine misfires at all loads | Fouled spark plugs, Defective or wrong spark plug, Sticking valves, Broken valve spring, Defective ignition wires, Defective or improperly adjusted points, Defective Ignition condenser, Improper Valve lash | Clean and adjust, Replace, Clean stems and guides, Replace, Adjust or replace breaker points |
| Low oil pressure | Oil too light, Oil badly diluted, Oil too low, Oil relief valve not Seating, Badly worn engine bearings | Drain, refill with proper oil, Drain, refill with proper oil, Add oil, Remove and clean, or replace, Replace, Clean all lines and passages, Remove and clean, Replace engine or panel unit |
| Plant starts but does not continue to run | Start button released too soon, Defective charging generator, Defective panel equipment | Hold in contact longer, Repair, See Controls |
| Engine backfires at carburetor | Lean fuel mixture, Clogged fuel screen, Intake air leak, Poor fuel, Spark too late, Spark plug wires crossed, Intake valves leaking | Clean or adjust carburetor, Clean screen, Replace flange gaskets, tighten carburetor, Refill with good, fresh fuel, Retime ignition, Install wires correctly, Grind or replace |
| Excessive oil consumption, light blue smoky exhaust | Sludged rings, excessive bearing clearances, piston skirt collapsed, worn intake valve guides | Replace worn parts, Remove and clean screen, Tighten screws and connections, Drain, refill with correct oil, Replace bearings |
| Black, smoky exhaust, excessive fuel consumption, fouling of spark plugs with black soot, possible lack of power under heavy load | Fuel mixture too rich, Choke not open, Dirty carburetor air cleaner | Be sure all jet gaskets are in place and tight; and float needle valve gasket is in place and tight. Adjust choke. Install needed carburetor parts, adjust float level |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan ED series troubleshooting guide (17 entries) →
Parts
4| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 4305-3 | Oil level gauge marks | Oil filter | Amazon eBay | |
| A299-1 | FAN PULLEY | Pump | Amazon eBay | |
| 926-3 | Supplement to 926-3 | Service part / kit | Amazon eBay | |
| A319 | COUNTERWEIGHTED CHOKE | 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
Parts manual — 926-0004 Onan ED series (spec A-G) Parts manual (04-1960) (Cummins/Onan)Service manual — 926-0003 Onan ED series Genset Operation, Installation, and Maintenance manual (Cummins/Onan)