Service parts for the KG40
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredBelts
1 requiredElectrical
1 requiredKOH-48RCLB-BATTERYBatteryfind
Ignition
1 requiredKOH-48RCLB-SPARKSpark plugfind
Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | natural gas / LP |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 40 kW |
| Standby kVA | 50 |
| Controller | APM402, Decision-Maker 3000 |
| Oil capacity | 7.1 L |
| Alternator | 4P5X |
| Voltage options | 120/208 V, 127/220 V, 120/240 V, 139/240 V, 220/380 V, 277/480 V, 347/600 V |
| Phase | 3 |
| Rated current | 139 A |
| Power factor | 0.8 |
| Battery cranking | 630 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 20.8 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 2200×1040×1170 mm |
| Dry weight | 807 kg |
Engine
| Oil capacity | 6.2 L |
|---|---|
| Coolant capacity | 21.3 L |
| Displacement | 6.2 L |
| Aspiration | Natural |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Kohler KG6208| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air cleaner assembly | A-253104 | Amazon Amazon eBay eBay | ||
| Fuel filter | Kohler 48RCLB Fuel Filter | — | 200 hr | ||
| Oil filter | Filter, 6.2L oil | GM101269 | Amazon eBay $49.00 | ||
| Battery | Kohler 48RCLB Battery | KOH-48RCLB-BATTERY | 1000 hr | buy | |
| Belt | Tensioner, 6.2L drive belt | GM102050 | Amazon eBay | ||
| Coolant | Kohler 48RCLB Coolant | 12.5 L | KOH-48RCLB-COOLANT | 1000 hr | buy |
| Coolant filter | Kohler 48RCLB Coolant Filter | KOH-48RCLB-COOL | 1000 hr | Amazon eBay | |
| Fuel | Kohler 48RCLB Fuel | 120.0 L | — | 1000 hr | |
| Oil | Coolant Capacity, L (gal.) | 21.9 L | KOH-48RCLB-OIL | 500 hr | Amazon eBay |
| Spark plug | Kohler 48RCLB Spark Plug | KOH-48RCLB-SPARK | 1000 hr | buy |
Service specifications
30| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Other | 10 in. weld flange bolt circle diameter B | 361.95 | mm (14.25 in.) | |
| Other | 10 in. weld flange outside diameter C | 406.4 | mm (16.0 in.) | |
| Other | 10 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 12 in. weld flange bolt circle diameter B | 431.80 | mm (17.00 in.) | |
| Other | 12 in. weld flange outside diameter C | 482.6 | mm (19.0 in.) | |
| Other | 12 in. weld flange quantity of bolts / bolt hole diameter D | 12, 25.40 | mm (1.00 in.) | |
| Other | 14 in. weld flange bolt circle diameter B | 476.25 | mm (18.75 in.) | |
| Other | 14 in. weld flange outside diameter C | 533.4 | mm (21.0 in.) | |
| Other | 14 in. weld flange quantity of bolts / bolt hole diameter D | 12, 28.58 | mm (1.13 in.) | |
| Other | 16 in. weld flange bolt circle diameter B | 539.75 | mm (21.25 in.) | |
| Other | 16 in. weld flange outside diameter C | 596.9 | mm (23.5 in.) | |
| Other | 16 in. weld flange quantity of bolts / bolt hole diameter D | 16, 28.58 | mm (1.13 in.) | |
| Other | 18 in. weld flange bolt circle diameter B | 577.85 | mm (22.75 in.) | |
| Other | 18 in. weld flange outside diameter C | 635.0 | mm (25.0 in.) | |
| Other | 18 in. weld flange quantity of bolts / bolt hole diameter D | 16, 31.75 | mm (1.25 in.) | |
| Other | 20 in. weld flange bolt circle diameter B | 635.00 | mm (25.00 in.) | |
| Other | 20 in. weld flange outside diameter C | 698.5 | mm (27.5 in.) | |
| Other | 20 in. weld flange quantity of bolts / bolt hole diameter D | 20, 31.75 | mm (1.25 in.) | |
| Other | 5 in. weld flange bolt circle diameter B | 215.90 | mm (8.50 in.) | |
| Other | 5 in. weld flange outside diameter C | 241.30 | mm (9.50 in.) | |
| Other | 5 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 6 in. weld flange bolt circle diameter B | 254.0 | mm (10.0 in.) | |
| Other | 6 in. weld flange outside diameter C | 279.4 | mm (11.0 in.) | |
| Other | 6 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | 8 in. weld flange bolt circle diameter B | 298.45 | mm (11.75 in.) | |
| Other | 8 in. weld flange outside diameter C | 342.9 | mm (13.5 in.) | |
| Other | 8 in. weld flange quantity of bolts / bolt hole diameter D | 8, 22.23 | mm (0.88 in.) | |
| Other | Weld flange angle A (10, 12, 14 in. nominal pipe size) | 30 | deg. | |
| Other | Weld flange angle A (16, 18, 20 in. nominal pipe size) | 22.5 | deg. | |
| Other | Weld flange angle A (5, 6, 8 in. nominal pipe size) | 45 | deg. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What is the power rating of the Kohler KG40?
The Kohler KG40 is rated 40 kW standby (50.0 kVA).
What engine does the Kohler KG40 use?
The Kohler KG40 is powered by the Kohler KG6208 engine.
What fuel type does the Kohler KG40 take?
The Kohler KG40 runs on natural gas / LP.
How much oil does the Kohler KG40 take?
The Kohler KG6208 engine in the Kohler KG40 has an oil capacity of 6.2 liters.
Which alternator is fitted to the Kohler KG40?
The Kohler KG40 uses a 4P5X alternator.
Which oil filter part number does the Kohler KG40 take?
The Kohler KG40 uses oil filter part number GM101269.
What air filter fits the Kohler KG40?
The Kohler KG40 uses air filter part number A-253104.
Parts
66| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 253107 | Element, Air Cleaner | 1 | Air filter | Amazon $43.25 eBay $69.00 |
| 253481 | Hose, Hump reducer (4 in. to 3 in.) | 2 | Hose | Amazon eBay |
| A-253104 | Air cleaner assembly | 1 | Air filter | Amazon Amazon eBay eBay |
| GM100213 | Engine bracket | 1 | Engine bracket | Amazon eBay |
| GM101208 | Hose barb, crankcase breather | 1 | Hose | Amazon eBay |
| GM101211 | Thermostat, 6.2L | 1 | Thermostat | Amazon eBay |
| GM101223 | Sensor, 6.2L oil pressure | 1 | Sensor | Amazon eBay |
| GM101269 | Filter, 6.2L oil | 1 | Oil filter | Amazon eBay $49.00 |
| GM102050 | Tensioner, 6.2L drive belt | 1 | Belt | Amazon eBay |
| GM102769 | Hose, Upper radiator | 1 | Hose | Amazon eBay |
| GM103656 | Hose, coolant SAE J20R2--DI 5/8 in. ID | 1 | Hose | eBay $23.00 |
| GM104549 | Hose, Radiator lower | 1 | Hose | Amazon eBay |
| GM104553 | Hose, Radiator upper | 1 | Hose | Amazon eBay |
| GM104554 | Hose, Reducer | 1 | Hose | Amazon eBay |
| GM104555 | Hose, Reducer | 1 | Hose | Amazon eBay |
| GM104787 | Air cleaner assembly | 1 | Air filter | Amazon eBay |
| GM105068 | Water Pump, W/ Gaskets | 1 | Pump | Amazon eBay $175.00 |
| GM105082 | Gasket, Timing Cover | 1 | Gasket | Amazon eBay |
| GM105083 | Timing Cover | 1 | Gasket | Amazon eBay |
| GM105110 | Intake Gasket | 2 | Gasket | Amazon eBay $51.75 |
| GM105112 | Head Gasket | 1 | Gasket | Amazon eBay |
| GM105118 | Oil Pump Assembly, With Pickup Tube | 1 | Pump | Amazon eBay |
| GM105119 | Gasket, Oil Pan, One Piece | 1 | Gasket | Amazon eBay |
| GM105121 | Bolt, HFH, 3/8- 16 x 2.25 (Water Pump) | 4 | Pump | Amazon eBay |
| GM105125 | Gasket, Water Pump | 2 | Gasket | Amazon eBay |
| GM105166 | Oilcool line, Lower, F6-06-06-8-8-8C-920 | 1 | Hose | Amazon eBay |
| GM105167 | Oilcool line, Upper, F6-06-06-8-8-8C-1432 | 1 | Hose | Amazon eBay |
| GM14098 | Hose, Lower radiator (44 mm ID) | 1 | Hose | Amazon eBay |
| GM62309 | Element, air cleaner | 1 | Oil filter | Amazon eBay $91.00 |
| GM88281-1 | Load Shed Assembly | 1 | Load shed assembly | Amazon eBay |
| GM88993-GR2 | Mount, Air Cleaner (6.76”ID) | 1 | Air filter | Amazon eBay |
| KG6208 | Air Filter, Oil, qts. 5.7L GM89979 | 1 | Spark plug | Amazon eBay $999.99 |
| KOH-48RCLB-AIRF | Kohler 48RCLB Air Filter | 1 | Air filter | Amazon eBay |
| KOH-48RCLB-BATTERY | Kohler 48RCLB Battery | 1 | Battery | buy |
| KOH-48RCLB-BELT | Kohler 48RCLB Belt | 1 | Belt | Amazon eBay |
| KOH-48RCLB-COOL | Kohler 48RCLB Coolant Filter | 1 | Coolant filter | Amazon eBay |
| KOH-48RCLB-COOLANT | Kohler 48RCLB Coolant | 12.5 | Fluid | buy |
| KOH-48RCLB-FUEL | Kohler 48RCLB Fuel Filter | 1 | Fuel filter | Amazon eBay |
| KOH-48RCLB-OIL | Kohler 48RCLB Engine Oil | 11.5 | Fluid | Amazon eBay |
| KOH-48RCLB-OILF | Kohler 48RCLB Oil Filter | 1 | Oil filter | Amazon eBay |
| KOH-48RCLB-SPARK | Kohler 48RCLB Spark Plug | 8 | Spark plug | buy |
| X-312-47 | Hose (0.63 in. ID x 36 in.) | 1 | Hose | eBay |
| X-312-62 | Hose, .63 ID | 1 | Hose | Amazon eBay $4.00 |
| X-391-19 | Connector, 90 degrees (5/8 in. ID hose) | 1 | Hose | eBay $30.00 |
| X-582-1 | Connector, hose (5/8 in. x 1/2 in. MIP brass) | 1 | Hose | Amazon eBay |
| X-6014-137 | Hose, Wire Insert 3 in. ID | 1 | Hose | Amazon eBay |
| X-6380-12 | Hose, Charged air cooler | 2 | Hose | Amazon eBay |
| 246242 | voltage reconnection decal | Service part / kit | Amazon eBay $9.67 | |
| 352945 | Block heater (kit GM78529-KP1-QS) | 1 | Service part / kit | eBay FridayParts $69.99 |
| 352946 | Block heater (kit GM78529-KP2) | 1 | Service part / kit | eBay |
| ADV-9039-A | Weather and Sound Enclosure assembly | Service part / kit | eBay | |
| G4-306 | Service part / kit | Amazon | ||
| G4-307 | Service part / kit | Amazon | ||
| GM101207 | Valve, PCV | 1 | Service part / kit | Amazon eBay |
| GM104703-KP1 | Battery heater kit, 120 Volts, heater wrap rating 50 Watts, battery wrap length 864 mm (34 in.), power cord length 483 mm (19 in.), plug cord length 75 mm (3 in.) | 1 | Service part / kit | Amazon eBay $105.00 |
| GM105063 | Connecting Rod | 8 | Service part / kit | Amazon eBay |
| GM105067 | Camshaft | 1 | Service part / kit | Amazon eBay |
| GM105073 | Bolt, HFH, 1/4- 20 x .50, WHZ | 1 | Service part / kit | Amazon eBay |
| GM105128 | Valve, Intake | 4 | Service part / kit | Amazon eBay |
| GM105129 | Valve, Exhaust | 4 | Service part / kit | Amazon eBay |
| GM105130 | Valve Spring | 8 | Service part / kit | Amazon eBay |
| GM105131 | Spring Locator (Valve) | 8 | Service part / kit | Amazon eBay |
| GM114539 | Wireless Bridge | Service part / kit | Amazon eBay | |
| GM17809 | Shield, heat (32 mm ID x 152 mm) | 1 | Service part / kit | eBay |
| GM23718 | Shield, heat (32 mm ID x 455 mm) | 1 | Service part / kit | eBay |
| GM88281 | Load Shed Assembly (mounts inside the transfer switch enclosure) | 1 | 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 |
|---|---|---|---|
| Standby | 25% | 175.2 | 46.28 |
| Standby | 50% | 268.8 | 71.01 |
| Standby | 75% | 406.8 | 107.47 |
| Standby | 100% | 584.4 | 154.38 |
Available documents
Spec sheet — g4278 (Kohler)Reference — G6-39 0918AZ (Kohler)Reference — Kohler-Gas Generators Brochure (Kohler)Reference — g6159 (Kohler)Parts manual — TP-7098 (Kohler)Parts manual — TP-7118 (Kohler)Parts manual — tp7098 (Kohler)Parts manual — tp7118 (Kohler)Service manual — tp7112 (Kohler)