Service parts for the G&855
Grouped by system, with how many of each the parts manual calls for.
Cooling system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Standby power | 125 kW |
|---|---|
| Prime power | 113 kW |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 250 hr | |||
| Fuel filter | — | ||||
| Oil filter | 9120016 | 750 hr | Amazon eBay | ||
| Battery | — | 250 hr | |||
| Belt | — | 250 hr | |||
| Coolant | — | ||||
| Coolant filter | Coolant Filter | WF2070 | Amazon eBay | ||
| Oil | E220 | 6000 hr | Amazon eBay FridayParts $36.05 | ||
| Spark plug | — | 1500 hr |
Common questions
How many kW is the Cummins/Onan G&855?
The Cummins/Onan G&855 is rated 125 kW standby.
What oil filter does the Cummins/Onan G&855 use?
The Cummins/Onan G&855 uses oil filter part number 9120016.
Troubleshooting
1Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine Hard to Start or Will Not Start | Low Battery or Low Air Supply, Check Instrument Panel Ground, Insufficient Fuel-Gas or No Gas System, Excessive Gas Pressure, Insufficient Air Restriction in Air Intake System, Insufficient Compression in Cylinders, Valve or Piston Ring Leakage, Valve and Crosshead Clearance Issues | Charge Battery or Check Air Supply, Check Instrument Panel Ground, Check Fuel-Gas Shut-Off, Open Manual or Re-Set Electric, Check Main Line Gas Pressure & Adjust If Req'd, Inspect & Adjust Gas Pressure Regulator, Check Atmospheric Vent for Leakage, Check Carburetor air/gas Valve Diaphragm, Check Gas Power Valve for proper setting, Check Air Cleaner, Check Carburetor Air Valve Spring, Check Individual Cylinders |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Repair guides
2Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
32| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 3803897 | Non-Shielded Spark Plugs | Non shielded spark plug | Amazon eBay | |
| 4-04 | Lube Oil Filter Housing GTA28 | Oil filter | Amazon eBay | |
| 4-16 | Thermostat | Thermostat | Amazon eBay | |
| 9120016 | Oil Filter | 1 | Oil filter | Amazon eBay |
| E220 | Lubricator - Air-Gas Starter | 1 | Lubricator | Amazon eBay FridayParts $36.05 |
| S-40XLBEX13 | Shielded Spark Plugs | Shielded spark plug | Amazon eBay | |
| WF2070 | Coolant Filter | 6 | Filter | Amazon eBay |
| WF2071 | Coolant Filter | 1 | Coolant filter | Amazon $29.60 eBay $18.95 FridayParts $37.53 |
| WF2072 | Coolant Filter | 1 | Coolant filter | Amazon $41.15 eBay $20.95 |
| WF2073 | Coolant Filter | 1 | Coolant filter | Amazon $26.99 eBay $14.40 |
| WF2074 | Coolant | 1 | Coolant filter | Amazon $38.15 eBay $24.00 FridayParts $38.99 |
| 4-02 | Dipstick | Service part / kit | Amazon eBay | |
| 4-03 | Lube Oil Crossover G855/GTAB55 | Service part / kit | Amazon eBay | |
| 4-05 | Oil Cooler Housing GTA19 | Service part / kit | Amazon eBay | |
| 4-06 | Dipstick, Low and High | Service part / kit | Amazon eBay | |
| 4-07 | Ignition Switch | Service part / kit | Amazon eBay | |
| 4-08 | Governor Sump Housing | Service part / kit | Amazon eBay | |
| 4-09 | Air Connection | Service part / kit | Amazon eBay | |
| 4-10 | Coolant Pressure Caps | Service part / kit | Amazon eBay | |
| 4-11 | Throttle Idle Speed | Service part / kit | Amazon eBay | |
| 4-12 | Sentinel Safety | Service part / kit | Amazon eBay | |
| 4-13 | Gas Primer Valves | Service part / kit | Amazon eBay | |
| 4-14 | Battery Terminals | Service part / kit | Amazon eBay | |
| 4-15 | Lubricant List - K21 and K25 Engines | Service part / kit | Amazon eBay | |
| 4-17 | Oil Temperature Gauge | Service part / kit | Amazon eBay | |
| 4-18 | Lube Oil Pressure Gauge | Service part / kit | Amazon eBay | |
| Mil-G-3545 | Grease | Service part / kit | Amazon eBay | |
| PB900706 | Parts Catalog | Service part / kit | Amazon eBay | |
| PB950101 | Parts Catalog | Service part / kit | Amazon eBay | |
| PB950901 | Parts Catalog | Service part / kit | Amazon eBay | |
| PB951201 | Parts Catalog | Service part / kit | Amazon eBay | |
| PB961001 | Parts Catalog | 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 — Cummins Gas GTA12-19-28-855 Manual 2001 (Cummins/Onan)