Service parts for the 15HQ-150R
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredBelts
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Standby power | 15 kW |
|---|---|
| Voltage options | 250 V |
Maintenance & consumables
for the Continental F-162| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter | 22-0156 | Amazon eBay | ||
| Fuel filter | Fuel Filter | 22-0193 | Amazon eBay | ||
| Oil filter | Oil Filter | 22-0178 | Amazon eBay | ||
| Battery | — | 12500 hr | |||
| Belt | Belt | 22-0347 | Amazon eBay | ||
| Coolant | — | 12500 hr | |||
| Coolant filter | — | ||||
| Oil | 4.0 quarts | — | 6000 hr | ||
| Spark plug | — | 6000 hr |
Common questions
What size generator is the Cummins/Onan 15HQ-150R?
The Cummins/Onan 15HQ-150R is rated 15 kW standby.
Which engine powers the Cummins/Onan 15HQ-150R?
The Cummins/Onan 15HQ-150R is powered by the Continental F-162 engine.
Which oil filter part number does the Cummins/Onan 15HQ-150R take?
The Cummins/Onan 15HQ-150R uses oil filter part number 22-0178.
What fuel filter fits the Cummins/Onan 15HQ-150R?
The Cummins/Onan 15HQ-150R uses fuel filter part number 22-0193.
What air filter does the Cummins/Onan 15HQ-150R use?
The Cummins/Onan 15HQ-150R uses air filter part number 22-0156.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine lacks power. | Tighten cylinder head and spark plugs.<br>If still not corrected, grind the valves,<br>Replace piston rings, if necessary. | Check the fuel system. Clean, adjust,<br>or replace parts necessary. |
| Engine misfires at light load. | Carburetor idle adjustment Adjust, clean if needed,<br>set wrong or clogged.<br>Spark plug gaps too narrow. Adjust to correct gap.<br>Intake air leak.<br>Faulty ignition.<br>Tighten or replace gaskets,<br>Clean, adjust, or replace breaker points, plugs, condenser, etc., or retime ignition.<br>Uneven compression. Tighten cylinder head and spark plugs.<br>If still not corrected, grind valves,<br>Replace piston rings, if necessary. | |
| Engine misfires at heavy load. | Spark plugs defective. Replace.<br>Clean, adjust, or replace breaker points, plugs, condenser, etc., or retime ignition.<br>Clogged carburetor. Clean jets.<br>Clogged fuel screen. Clean.<br>Replace.<br>Faulty ignition.<br>Defective spark plug cables. | |
| Engine misfires at all loads. | Fouled spark plug. Clean and adjust.<br>Wrong or effective spark plug. Replace.<br>Ticking valves. Clean stems and guides.<br>Broken valve spring. Replace.<br>Defective ignition wires. Replace.<br>Effective or improperly adjusted Adjust or replace breaker points. | |
| Low oil pressure. | Oil too light. Drain, refill with proper oil.<br>Dil badly diluted. Drain, refill with proper oil.<br>Oil too low. Add oil.<br>Dil relief valve not seating. Remove and clean, or replace.<br>Badly worn bearings. Replace.<br>Sludge on oil screen. Remove and clean.<br>Badly worn oil pump. Replace.<br>Defective oil pressure gauge. Replace. | |
| High oil pressure. | Oil too heavy. Drain, refill with proper oil.<br>Slogged oil passage. Clean all lines and passages.<br>Oil relief valve stuck. Remove and clean.<br>Defective oil pressure gauge. Replace. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan 15HQ-150R troubleshooting guide (24 entries) →
Repair guides
1Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
19| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 185-638 | Gasket Exhaust and Intake Manifold | 1 | Gasket | Amazon eBay |
| 185-749 | Gasket Cylinder Water Outlet | 1 | Gasket | Amazon eBay |
| 22-0156 | Air Filter | 1 | Air filter | Amazon eBay |
| 22-0178 | Oil Filter | 1 | Oil filter | Amazon eBay |
| 22-0193 | Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 22-0256 | Spark Plug | 1 | Spark plug | Amazon eBay |
| 22-0347 | Belt | 1 | Belt | Amazon eBay |
| 309-39 | Thermostat Coolant Water | 1 | Thermostat | Amazon eBay |
| 100P124 | Engine Replacement Assembly | 1 | Service part / kit | Amazon eBay |
| 10S-150/15A | Switchboard | Service part / kit | buy | |
| 10S-150/16A | Switchboard | Service part / kit | buy | |
| 10S-150/17A | Switchboard | Service part / kit | buy | |
| 15S-150/15A | Switchboard | Service part / kit | buy | |
| 15S-150/16A | Switchboard | Service part / kit | buy | |
| 15S-150/17A | Switchboard | Service part / kit | buy | |
| 185-507 | Shaft Assembly Magneto Drive | 1 | Service part / kit | Amazon eBay |
| 240-18 | DAY (FUEL RESERVOIR) TANK. - This 1 quart (U.S.) reservoir tank supplies fuel for quick starting. | Service part / kit | Amazon eBay FridayParts $40.36 | |
| 240-79 | RESTRICTED OUTLET: BE SURE THAT A RETURN LINE IS INSTALLED FROM *DAY* TANK TO MAIN FUEL TANK: FLEXIBLE LINE BETWEEN TANK AND SOLID LINE. | Service part / kit | Amazon eBay KuduParts $97.00 | |
| 24avess | CARBURETOR RESERVOIR FUEL TANK | 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 — 921-0006 Onan HQ series Genset Instruction Manual (1960) (Cummins/Onan)