Service parts for the GH400
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel 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 | foam wrapper on paper element air filter | Fs-1830-2 | Amazon eBay | ||
| Fuel filter | sediment bowl for fuel filter | Y-1846 | Amazon eBay | ||
| Oil filter | not explicitly stated in the document | — | |||
| Spark plug | remove and inspect at intervals indicated in the Operator's Manual, clean electrode with wire brush, measure and reset electrode gap to specified setting, replace if electrode or insulator are deformed or cracked | — |
Common questions
Which fuel filter part number does the Cummins/Onan GH400 take?
The Cummins/Onan GH400 uses fuel filter part number Y-1846.
What air filter fits the Cummins/Onan GH400?
The Cummins/Onan GH400 uses air filter part number Fs-1830-2.
Troubleshooting
7Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine Misfires | Faulty ignition due to: a. worn or fouled spark plug; b. faulty ignition system; c. faulty plug wire; Lean fuel mixture due to: a. incorrectly adjusted carburetor; b. incorrect float level; c. dirt in carburetor; d. vacuum leak; Contaminated fuel; Dirty air cleaner | A. Clean or replace spark plug. b. See Ignition System section. c. Check spark plug wire and replace if necessary. a. See Carburetor Adjustment section. b. Check carburetor float. c. Disassemble carburetor and clean all internal passages. d. Drain fuel tank and refill with fresh fuel. e. Clean or replace air cleaner. |
| Engine Backfires | Faulty ignition due to: a. worn or fouled spark plug; b. faulty ignition system; Lean fuel mixture due to: a. incorrectly adjusted carburetor; b. incorrect float level; c. dirt in carburetor; d. vacuum leak; | A. Clean or replace spark plug. b. See Ignition System section. c. Check spark plug wire and replace if necessary. a. See Carburetor Adjustment section. b. Check carburetor float. c. Disassemble carburetor and clean all internal passages. |
| Engine Lacks Power | Faulty ignition due to: a. worn or fouled spark plug; b. faulty ignition system; Dirty air cleaner; Restricted fuel flow due to plugged fuel filter; Incorrect fuel mixture due to: a. incorrectly adjusted carburetor; b. incorrect float level; c. dirt in carburetor; Lean fuel mixture due to: a. incorrectly adjusted carburetor; b. incorrect float level; c. dirt in carburetor; d. vacuum leak; Exhaust system blocked or restricted; Incorrect valve clearance; No load speed set too low; Excessive engine wear or damage to engine; Choke valve blockage or choke lever set incorrectly; | A. Clean or replace spark plug. b. See Ignition System section. c. Clean or replace air cleaner. d. Clean or replace fuel filter. e. a. See Carburetor Adjustment section. b. Check carburetor float. c. Disassemble carburetor and clean all internal passages. f. Locate and remove cause of blockage. g. Adjust valve clearance/inspect valves (see Engine Block Assembly section). h. Adjust governor setting. i. See Engine Block Assembly section. j. Open choke lever fully, if problem continues see fuel System section. |
| Engine Overheats | Restricted air flow due to dirt or debris blocking air inlet or outlet; Dirt or oil covering engine cooling fins; Cooling fan plugged or broken; Lean fuel mixture due to: a. incorrectly adjusted carburetor; b. incorrect float level; c. dirt in carburetor; | A. Clear away any debris that may restrict airflow. b. Clean away all dirt and oil from engine cooling fins. c. Inspect cooling fan, see Generator Service section. d. a. See Carburetor Adjustment section. b. Check carburetor float. c. Disassemble carburetor and clean all internal passages. |
| Black Exhaust Smoke | Rich fuel mixture due to: a. dirty air cleaner; b. choke closed; c. incorrectly adjusted carburetor; d. dirt in the carburetor; Lean fuel mixture due to: a. dirty air cleaner; b. incorrect float level; c. incorrectly adjusted carburetor; d. dirt in the carburetor; Clogged or faulty breather; Contaminated fuel; Excessive engine wear; | A. Clean or replace air cleaner. b. Check choke setting. c. See Carburetor Adjustment section. d. Disassemble carburetor and clean all internal passages. a. Clean or replace air cleaner. b. Check carburetor float. c. See Carburetor Adjustme |
| White or Blue Exhaust Smoke | Clogged or faulty breather; Contaminated fuel; | A. Clean or replace air cleaner. b. Check choke setting. c. See Carburetor Adjustment section. d. Disassemble carburetor and clean all internal passages. |
| Engine Hunts or Surges | Sticking or binding governor linkage; Incorrect governor adjustment; Faulty governor spring; Incorrect fuel mixture due to: a. incorrectly adjusted carburetor; b. incorrect float level; c. dirt in carburetor; Governor mechanism worn excessively; Fuel supply problem caused by: a. Dirty fuel filter; b. Contaminated fuel supply; | A. Clean or replace air cleaner. b. Check choke setting. c. See Carburetor Adjustment section. d. Disassemble carburetor and clean all internal passages. e. Adjust valve clearance/inspect valves (see Engine Block Assembly section). f. Adjust governor setting. g. See Engine Block Assembly section. h. Open choke lever fully, if problem continues see fuel System section. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
4| Part # | Description | Qty | System | |
|---|---|---|---|---|
| Fs-1828-2 | paper element only air filter | Air filter | Amazon eBay | |
| Fs-1830-2 | foam wrapper on paper element air filter | Air filter | Amazon eBay | |
| Y-1846 | sediment bowl for fuel filter | Fuel filter | Amazon eBay | |
| CO31FO.58 | FLOAT CHAMBER | Service part / kit | buy |
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 — 981-0510 Onan EGH EGS Service Manual (2-1994) (Cummins/Onan)