Service parts for the G125U
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 required1.836Oil filterfind
Belts
1 requiredElectrical
1 requiredIgnition
1 required2.270Spark plugfind
Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | Natural Gas/LPG |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 95 kW |
| Standby kVA | 95 |
| Prime power | 90 kW |
| Controller | XC500 |
| Oil capacity | 10.0 L |
| Alternator | 4S11, 4S13, 4V11 (4-pole, Class H insulation) |
| Voltage options | 120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 277/480 V, 11 V, 13 V |
| Phase | 3 |
| Rated current | 434 A |
| Power factor | 0.8 |
| Circuit breaker | 458 A |
| Battery group | 1 |
| Battery cranking | 630 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 10.0 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 2400×1040×1484 mm |
| Dry weight | 1134 kg |
Engine
| Oil capacity | 10.0 L |
|---|---|
| Coolant capacity | 10.0 L |
| Displacement | 8.1 L |
| Aspiration | Natural Aspiration |
| Rated speed | 1500 rpm |
Same engine, other brands
3 brandsThe General Motors 8.1L in this set also powers 5 generator sets sold under 3 other brands. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| Kohler | 100REZG, 125RZG, REZG |
| Cummins/Onan | GGLB-5791965 |
| General Motors | 8.1L Powertrain |
Maintenance & consumables
for the General Motors 8.1L| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 500 hr | |||
| Fuel filter | — | 1000 hr | |||
| Oil filter | Replace oil filter | 1.836 | 250 hr | buy | |
| Battery | 1, Crown 24-XD | ×1 | 24-XD | eBay | |
| Belt | Drive Belt Tensioner | 374176 | Amazon eBay | ||
| Coolant | 29.9 liters | — | 1000 hr | ||
| Coolant filter | — | ||||
| Oil | 7.1 liters | — | 250 hr | ||
| Spark plug | Replace spark plugs | 2.270 | 10000 hr | buy |
Common questions
What size generator is the SDMO G125U?
The SDMO G125U is rated 95 kW standby (95.0 kVA).
What engine is in the SDMO G125U?
The SDMO G125U is powered by the General Motors 8.1L engine.
What fuel does the SDMO G125U use?
The SDMO G125U runs on Natural Gas/LPG.
How much oil does the SDMO G125U take?
The General Motors 8.1L engine in the SDMO G125U has an oil capacity of 10.0 liters.
What is the coolant capacity of the SDMO G125U?
The SDMO G125U cooling system holds 10 liters (2.6 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the continuous rating of the SDMO G125U?
The SDMO G125U is rated 90 kW prime (90 kVA), against 95 kW standby.
How much does the SDMO G125U weigh?
The SDMO G125U has a dry weight of 1134 kg (2500 lb).
What voltages is the SDMO G125U available in?
The SDMO G125U is offered in 120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 277/480 V, 3-phase.
How many cold cranking amps does the SDMO G125U require?
The SDMO G125U uses 1 battery, 12 V each, 630 CCA, group 1, per the manufacturer specification sheet.
Which alternator is fitted to the SDMO G125U?
The SDMO G125U uses a 4S11, 4S13, 4V11 alternator. It has 4 poles. Insulation class H.
What oil filter does the SDMO G125U use?
The SDMO G125U uses oil filter part number 1.836.
Parts
65| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 1052367 | Engine Oil Supplement Lubricant | Fluid | Amazon eBay $19.95 | |
| 290090 | Switch, low water temperature | 1 | Sensor | Amazon eBay |
| 373133 | Clutch Pilot Bearing Removal Tools Required | Clutch pilot bearing removal tools required | Amazon eBay $84.66 | |
| 374176 | Drive Belt | Belt | Amazon eBay | |
| 375105 | Clutch Pilot Bearing Removal (C/K/C3500HD) | Clutch pilot bearing removal | Amazon eBay | |
| 416E | Manifold Absolute Pressure (MAP) sensor circuit - CKT 416E | Sensor | FridayParts $12.00 SinoCMP $729.00 | |
| 470515 | Repair Instructions - Draining Fluids and Oil Filter Removal | Repair instructions | Amazon eBay $7.65 | |
| 470572 | Engine Flywheel Removal (C/K/C3500HD with AT MT1) | Engine flywheel removal | Amazon eBay | |
| 470576 | Engine Flywheel Removal (Medium Duty with MT) | Engine flywheel removal | Amazon eBay $110.99 | |
| 470599 | Engine Flywheel Housing Removal (Medium Duty with AT) | Engine flywheel housing removal | Amazon eBay | |
| 470627 | Clutch Pilot Bearing Removal (Medium Duty) | Clutch pilot bearing removal | Amazon eBay | |
| 470639 | Oil Level Indicator and Tube Removal (C/K/C3500HD) | Oil level indicator and tube removal | Amazon eBay $90.00 | |
| 470666 | Oil Level Indicator and Tube Removal (G) | Oil level indicator and tube removal | Amazon eBay | |
| 638592 | Flywheel Housing Adapter, Medium Duty with Manual Transmission | Flywheel housing adapter | Amazon eBay $695.00 | |
| 638596 | Cylinder Head and Components | Cylinder head and components | Amazon eBay | |
| 638602 | Intake Manifold and Components | Intake manifold and components | Amazon eBay $4840.00 | |
| 638608 | Engine Crankshaft and Components | Engine crankshaft and components | Amazon eBay | |
| 638616 | Lower Engine Block and Components | Lower engine block and components | Amazon eBay | |
| 640013 | Crankshaft Balancer Removal Tools Required | Crankshaft balancer removal tools required | Amazon eBay $12.99 | |
| 640014 | Crankshaft Balancer Removal Steps | Crankshaft balancer removal steps | Amazon eBay $11.08 | |
| 677764 | Engine Identification Number | Engine identification number | Amazon eBay $94.90 | |
| 677814 | Engine Flywheel Removal (C3500HD with AT M74) | Engine flywheel removal | Amazon eBay | |
| 679414 | Engine Flywheel Removal (C/K with MT) | Engine flywheel removal | Amazon eBay $19.58 | |
| 9985770 | MAP Sensor Seal Lubricant | Fluid | Amazon eBay | |
| GM16430 | Sealer, oil pan / Sealant, Loctite | Fluid | Amazon | |
| GM16576 | Seal, oil pan drain plug | 1 | Seal | Amazon eBay |
| GM16703 | Filter, oil | 1 | Oil filter | Amazon eBay $58.00 NAPA $3.59 |
| GM18888 | Sealer, crankshaft rear main bearing | Fluid | Amazon | |
| GM18906 | Sensor, knock | 2 | Sensor | Amazon |
| GM18933 | Sealer, camshaft bearing hole plug | Fluid | Amazon | |
| GM18934 | Grease, heavy duty multipurpose | Fluid | Amazon | |
| GM18951 | Gasket, engine front cover, also part of 76 | 1 | Gasket | Amazon |
| GM18952 | Sensor, crankshaft position (includes 123) | 1 | Sensor | Amazon |
| GM18963 | Gasket, water pump | 2 | Gasket | Amazon |
| GM18964 | Gasket, engine coolant crossover | 2 | Gasket | Amazon |
| GM18967 | Hose, therm bypass includes hose clamps | 1 | Hose | Amazon |
| GM18971 | Seal, crankshaft rear oil | 1 | Seal | Amazon |
| GM18972 | Seal, crankshaft front oil | 1 | Seal | Amazon |
| GM18990 | Pump, oil with screen | 1 | Pump | Amazon |
| GM19004 | Sensor, camshaft position (2001 GM engines / GM model year 2003 and older) | 1 | Sensor | Amazon |
| GM19009 | Gasket, oil pan | 1 | Gasket | Amazon |
| GM19027 | Pump kit, water (incl. 31, 82, 83, 85, 105) | 1 | Pump | Amazon |
| GM24739 | Sensor, camshaft position (2002 and 2003 GM engines) | 1 | Sensor | Amazon |
| GM42165 | Thermostat, block heater 49C--60C (120F--140F) | 1 | Thermostat | Amazon |
| GM51539 | Sensor, camshaft position (2004-- GM engines) | 1 | Sensor | Amazon |
| GM75077 | Sensor, Cm/Shf Posn (GM model year 2004 and newer) | Sensor | Amazon | |
| MEFI4309 | Map Sensor 1 | Sensor | buy | |
| MEFI4310 | Knock Sensor (KS) 1 | Sensor | buy | |
| MEFI4313 | Heated Oxygen (HO2) Sensor 1 | Sensor | buy | |
| NGE012014 | Charge Air Cooler Bolts | Bolt | Amazon eBay | |
| S105 | Ignition Coil (cylinders #8) | 1 | Ignition coil | FridayParts $7.90 |
| S107 | Ignition Coil (cylinders #1, #3 & #5) | 1 | Ignition coil | Amazon eBay FridayParts $84.50 |
| TJ14R-P15 | Denso plug type | Spark plug | buy | |
| 0333-0588-03 | Coolant heater, 1500W, 120V | 1 | Service part / kit | eBay |
| 1051396 | Engine Oil Supplement Lubricant | Service part / kit | Amazon eBay $19.95 | |
| 1052942 | Crankshaft Rear Bearing Cap Sealant | Service part / kit | Amazon eBay $9.99 | |
| 12377901 | Camshaft Rear Bearing Hole Plug Sealant | Service part / kit | Amazon eBay | |
| 22307 | Test Light Amperage Draw Test | Service part / kit | buy | |
| 24-XD | Battery, Crown 24-XD | 1 | Service part / kit | eBay |
| 39200 | DVOM J 39200 | Service part / kit | buy | |
| C109 | Ignition Control Ground | 1 | Service part / kit | buy |
| C110 | Ignition Control Ground | 1 | Service part / kit | FridayParts $14.90 |
| GM23005-5 | Coolant heater, Hotstart, 1500W, 120V | 1 | Service part / kit | eBay |
| GM28341 | Battery charger, 120V, 1.6A | 1 | Service part / kit | eBay |
| LG199 | Home Maintenance Kit | 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.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 10.4 | 369.0 | |
| Prime | 25% | 17.7 | 4.68 |
| Prime | 50% | 26.1 | 6.89 |
| Prime | 75% | 35.8 | 9.46 |
| Prime | 100% | 43.9 | 11.6 |
| Standby | 10.4 | 369.0 | |
| Standby | 25% | 18.4 | 4.86 |
| Standby | 75% | 38.9 | 10.28 |
| Standby | 100% | 46.8 | 12.36 |
Available documents
Spec sheet — G125U (SDMO)
This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.