Kohler 12RES — Specs, Engine, Parts & Maintenance

Service parts for the 12RES

Grouped by system, with how many of each the parts manual calls for.

Air intake

1 required

ADV-6823-AAir filtersee priceAmazon

Fuel system

1 required

GM29253Fuel filtersee priceAmazon

Oil system

1 required

12 050 01Oil filter$19.06eBay

Cooling system

1 required

GM110973-CMPCoolant filtersee priceAmazon

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

Fuel	natural gas or propane (LP) vapor
Frequency	60.0 Hz
Standby power	12 kW
Standby kVA	12
Prime power	10.4 kW
Emissions	EPA
Controller	ADC 2100, ADC-RES, ADC-RES (Advanced Digital), Advanced Digital, Advanced Digital (ADC 2100), Advanced Digital ADC-RES, Advanced Digital Features, DC 2200, DC 2200 Digital, DC-RET, DC-RET Digital
Oil capacity	1.9 L
Alternator	2F4 (2-pole, Class Class 180 (H) insulation)
Voltage options	246/242 V
Phase	1
Rated current	50/43 A
Power factor	1.0
Circuit breaker	50 A
Battery group	26
Battery cranking	525 minimum at -18 C (0 F) CCA
Battery voltage	12 VDC V
Battery quantity	1
Starting system	12 V DC
Dimensions (L×W×H)	42×30×32 mm
Dry weight	182 kg
Sound level	65.0 dBA @ 23 ft m

Engine

Kohler CH 740

Oil capacity	2.0 L
Coolant capacity	0.0 L
Displacement	0.725 L
Aspiration	air-cooled
Rated speed	3000 rpm

Same engine, other brands

1 brand

The Kohler CH 740 in this set also powers 1 generator set sold under 1 other brand. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.

Brand	Models
SDMO	RES 12 TEC

Maintenance & consumables

for the Kohler CH 740

Item	Spec	Capacity	Part #	Interval
Air filter	Air Filter, Spark Plug Location		ADV-6823-A		Amazon eBay
Fuel filter	Fuel orifice fitting		GM29253		Amazon eBay
Oil filter	Oil filter		12 050 01		Amazon eBay $19.06 KuduParts $11.00 FridayParts $33.98
Battery	Group size 51, CCA 500		—	200 hr
Belt			—
Coolant			—
Coolant filter	Pressure port		GM110973-CMP		Amazon eBay
Oil		2.7 L	—	300 hr
Spark plug			—	300 hr

Service intervals

Item	Action	Hours	Months	Notes
Oil level	Check	8 hr		First service — or before use
Air cleaner and precleaner	Clean	100 hr	12 mo	Yearly or 100 Hrs.; service more often in dusty areas
Air cleaner and precleaner (8.5/12RES)	Replace	100 hr	12 mo	Yearly or 100 hours; replace as necessary
Air cleaner and precleaner service	Clean	100 hr	12 mo	Yearly or 100 hr.; service more frequently in dusty areas
Air cleaner and precleaner service	Replace	100 hr	12 mo	Yearly or 100 hours, 8.5/12 kW models; replace as necessary
Air cleaner and precleaner service (8.5/12 kW)	Replace	100 hr		Yearly or 100 hours; service more frequently under dusty/dirty conditions
Change oil	Replace	100 hr	12 mo	Yearly or 100 hr.
Crankcase oil	Change	100 hr	12 mo	Yearly or 100 Hrs.
Engine oil	Change	150 hr	12 mo	Lubrication; Yearly or 100 hours
Oil cooler	Clean	100 hr	12 mo	Yearly or 100 hours; 17/18 kW models
Oil cooler	Inspect	100 hr		Yearly or 100 hours (17/18 kW models)
Oil cooler (17/18RES)	Clean	100 hr	12 mo	Yearly or 100 hours; inspect and clean
Air cleaner service	Clean	150 hr		Yearly or hours shown; 17/18 kW models
Air cleaner service	Replace	300 hr	12 mo	Yearly or 150 hours shown (300 hours also listed), 17/18 kW models
Air cleaner service (17/18 kW)	Replace	150 hr		Yearly or 150/300 hours
Change oil	Change	150 hr	12 mo	Yearly or 150 hours, 17/18 kW models
Engine oil (17/18RES)	Change	150 hr	12 mo	Yearly or 150 hours
Oil	Change	150 hr		Yearly or 150 hours; 17/18 kW models
Oil filter (17/18RES)	Replace	150 hr	12 mo	Yearly or 150 hours
Spark plugs	Clean	150 hr		Yearly or hours shown; 17/18 kW models
Spark plugs (17/18 kW)	Replace	150 hr		Yearly or 150/300 hours
Oil filter	Replace	200 hr	12 mo	Yearly or 200 hours; 8.5/12 kW models
Oil filter(s)	Replace	200 hr	12 mo	Yearly or 200 Hrs.
Replace filter	Replace	200 hr	12 mo	Yearly or 200 hours
Replace filter (oil filter)	Replace	200 hr		Yearly or 200 hours (8.5/12 kW models)
Replace filter(s)	Replace	200 hr	12 mo	Yearly or 200 hr.
Air cleaner service	Change	300 hr		Yearly or hours shown; 17/18 kW models
Spark plugs	Check	300 hr	12 mo	Yearly or 300 hours; 8.5/12 kW models
Spark plugs	Replace	500 hr	12 mo	Yearly or hours shown; 17/18 kW models
Spark plugs (8.5/12 kW)	Replace	300 hr		Yearly or 300 hours
Spark plugs (8.5/12RES)	Check	300 hr	12 mo	Yearly or 300 hours
Crankcase breather	Change	500 hr	12 mo	Lubrication; Yearly or 500 hours
Crankcase breather	Inspect	500 hr	12 mo	Yearly or 500 hours
Crankcase breather hose	Check	500 hr	12 mo	Yearly or 500 hours; 8.5/12 kW models
Crankcase breather hose	Clean	500 hr	12 mo
Crankcase breather hose	Inspect	500 hr		Yearly or 500 hours
Crankcase breather hose	Other	500 hr	12 mo	Yearly or 500 hr.; follow engine manufacturer's maintenance manual
Replace spark plugs	Replace	500 hr
Replace stepper motor coupling and bushing	Replace	500 hr		authorized distributor/dealer only
Resistance readings of windings with insulation tester (Megger)	Test	500 hr	36 mo	3 yr.; with SCR assembly or rectifier and load leads disconnected

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Clearance at exhaust end	4	ft
Clearance	Clearance to combustible wall	5	ft
Clearance	Clearance to non-combustible wall (minimum)	18	in
Clearance	Clearance to non-combustible wall (recommended)	3	ft
Clearance	Distance from exhaust end of set to furnace and other similar intakes	10	ft
Clearance	Distance from exhaust end of set to nearest structure opening (window, vent, door)	5	ft
Clearance	Gravel base thickness (with weed barrier)	3	in
Clearance	Minimum distance of plants, shrubs, or combustibles from air intake	18	in
Clearance	Recommended distance from structure (NFPA 37, combustible material)	5	ft
Gap	Magnetic pickup air gap	0.5	mm (0.020 in.)
Gap	Spark Plug Gap 12/17/18RES	0.76	mm (0.030 in.)
Gap	Spark Plug Gap 8.5kW	0.51	mm (0.020 in.)
Gap	Spark plug gap	0.030	in.	cold
Gap	Spark plug gap	0.51	mm (0.02 in.)
Gap	Spark plug gap	0.7--0.8	mm (0.028--0.030 in.)
Gap	Spark plug gap	0.76	mm (0.030 in.)
Gap	Spark plug gap	0.76 mm (0.030 in.)	mm
Gap	Spark plug gap	0.8--0.9	mm (0.03--0.04 in.)
Gap	Spark plug gap	0.89	mm (0.035 in.)
Gap	Spark plug gap	0.9--1.0	mm (0.036--0.04 in.)
Gap	Spark plug gap, 12/17/18RES	0.76	mm (0.030 in.)	cold
Gap	Spark plug gap, 8.5 kW	0.51	mm (0.020 in.)	cold
Other	Anchor bolt size	3/8	in	4 places, high wind 150 mph mounting detail
Other	Battery charger output	6	amp
Other	Battery charger power requirement (max.)	192	watts	max.
Other	Battery electrolyte specific gravity	1.260	specific gravity	at 26.7 C (80 F), full charge
Other	Battery electrolyte specific gravity (full charge)	1.260		electrolyte at 26.7 C (80 F)
Other	Battery electrolyte specific gravity minimum	1.215	specific gravity	at 26.7 C (80 F); recharge if less
Other	Battery minimum cold cranking amps	525	CCA	at 0F
Other	Battery specific gravity (charge threshold)	1.215		electrolyte at 26.7 C (80 F)
Other	Battery specific gravity variation (charge threshold)	0.01		cell-to-cell variation
Other	Battery wrap length	1067 (42)	mm (in.)
Other	Battery wrap length	864 (34)	mm (in.)
Other	Below ground level (fuel line depth)	76-102 [3.0-4.0]	mm [in]
Other	Brush length, new	19.05	mm (0.75 in.)	new
Other	Carburetor heater power requirement (max.)	38	watts	max., not included on all models
Other	Combustion air requirement	1.1	m3/min
Other	Combustion air requirement (60 Hz)	1.1 (39.2)	m3/min. (cfm)	60 Hz
Other	Combustion air requirement (60 Hz)	1.62 (57.3)	m3/min. (cfm)	60 Hz
Other	Compression ratio	8.5:1
Other	Compression ratio	9.0:1
Other	Cooling air requirement	26.9	m3/min
Other	Cooling air requirement (60 Hz)	26.9 (950)	m3/min. (cfm)	60 Hz
Other	Cooling air requirement (60 Hz)	28.0 (989)	m3/min. (cfm)	60 Hz
Other	Crank cycle	3 attempts of 15 seconds cranking and 15 seconds rest	seconds
Other	Engine oil capacity	1.9	L (2.0 qt.)
Other	Engine oil capacity	1.9 L (2.0 qt.)	L
Other	Engine oil capacity	2.8	L (3.0 qt.) approximately
Other	Exhaust flow at rated kW	3.8	m3/min	rated kW
Other	Exhaust flow at rated kW	3.8 (135)	m3/min (cfm)	at rated kW
Other	Exhaust flow at rated kW	5.3 (187)	m3/min (cfm)	at rated kW
Other	Fuel flow rate, LP vapor	203000	Btu/hr.
Other	Fuel flow rate, LP vapor	280000	Btu/hr.
Other	Fuel flow rate, natural gas	193000	Btu/hr.
Other	Fuel flow rate, natural gas	242000	Btu/hr.
Other	Fuel supply inlet	1/2	NPT
Other	Fuel system leak test pressure	6-8 ounces per square inch (10-14 inches water column)	oz/in²	LPG vapor or natural gas system
Other	Gas flow rate required for the generator set	193,000	Btu/hr.
Other	Heater wrap rating	50	Watts
Other	Heater wrap rating	65	Watts

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Engine oil	5W-30	API Service Class SG, SH, or SJ synthetic		2.8 L	18 kW models; approximately 2.8 L (3.0 qt.)
Engine oil	API Service Class SG, SH, or SJ synthetic oil	API SG/SH/SJ		1.9 L	Select viscosity based on air temperature; Figure 3-2 shows 10W-30 and 5W-20/5W-30.
Engine oil	Recommended oil			1.9 L	With filter
Engine oil	Synthetic	API Service Class SG or higher			Use synthetic oil, API Service Class SG or higher
Engine oil	Synthetic oil	API Service Class SG or higher			Maintain oil level at or near, not over, the full mark on the dipstick. See TP-6517 Operation Manual for additional information.
Engine oil	Synthetic oil, API Service Class SG or higher	API SG or higher		1.9 L (2.0 qt.)	8.5RES capacity with filter; see engine oil selection chart for viscosity (5W-20, 5W-30, 10W-30)
Engine oil	10W-30; 5W-20, 5W-30	API Service Class SG, SH, or SJ synthetic	-30°C to 40°C	1.9 L	12 kW models; select viscosity based on air temperature expected before next oil change
Engine oil	5W-20, 5W-30	API Service Class SG or higher, synthetic	-30°C to 10°C		Engine Oil Selection chart; use synthetic oil
Engine oil	10W-30	API Service Class SG or higher, synthetic	-20°C to 40°C		Engine Oil Selection chart; use synthetic oil
Fuel		LP gas or natural gas			Minimum supply pressure 7--11 in. H2O (4--6 oz./in.2); multi-fuel system field convertible
Fuel	LP gas or natural gas				LP/natural gas minimum supply pressure 7--11 in. H2O (4--6 oz./in.2)
Fuel	LP vapor				Nominal fuel rating 2500 Btu/ft3 (93 MJ/m3); supply pressure 1.7--2.7 kPa (7-11 in. H2O); LP vapor conversion factors: 8.58 ft3 = 1 lb., 36.39 ft3 = 1 gal.
Fuel	LP vapor, 93 MJ/m3 (2500 Btu/ft3)				Nominal fuel rating
Fuel	LPG				Fuel supply pressure 1.7-2.7 kPa (7-11 in H2O); nominal fuel rating 2500 Btu/ft3 (93 MJ/m3); supply inlet 1/2 NPT
Fuel	Natural Gas				Fuel supply pressure 1.3-2.7 kPa (5-11 in H2O) for 8.5/12RES, 1.7-2.7 kPa (7-11 in H2O) for 18RES; nominal fuel rating 1000 Btu/ft3 (37 MJ/m3); supply inlet 1/2 NPT
Fuel	Natural Gas or LP Vapor				Generator set is CARB- and EPA-certified for both natural gas and LP vapor fuels. Multi-fuel system allows field conversion between natural gas and LP vapor.
Fuel	Natural Gas or LPG	EPA-certified			Fuel supply inlet 1/2 NPT; natural gas pressure 0.9–2.7 kPa (3.5–11 in. H2O); LPG pressure 1.7–2.7 kPa (7–11 in. H2O)
Fuel	Natural gas				Nominal fuel rating 1000 Btu/ft3 (37 MJ/m3); supply inlet 1/2 NPT; supply pressure 1.7--2.7 kPa (7-11 in. H2O)
Fuel	Natural gas or LP vapor				Nominal fuel rating: natural gas 1000 Btu/ft3 (37 MJ/m3); LP vapor 2500 Btu/ft3 (93 MJ/m3). Supply pressure 1.7-2.7 kPa (7-11 in. H2O).
Fuel	Natural gas or propane (LP) vapor	Field-convertible multi-fuel; CARB emission certified			Clean-burning natural gas or propane (LP) vapor; air-cooled engine, no liquid coolant
Fuel	Natural gas, 37 MJ/m3 (1000 Btu/ft3)				Nominal fuel rating
Fuel	natural gas or propane (LP) vapor				Field-convertible multi-fuel system maintaining CARB emission certification
Other	Bicarbonate of soda (baking soda) and water solution				Battery acid cleanup: 500 g (1 lb.) bicarbonate of soda to 4 L (1 gal.) water; also used to clean battery and cables
Other	Petroleum jelly, silicone grease, or other nonconductive grease				Coat battery terminals after reconnecting cables

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Fault codes

Code	Name	Meaning	Severity	Action
AF	Auxiliary fault input shutdown	Shutdown initiated by pushing the emergency stop switch (TRES models only). Not used on RES models.	Shutdown	Check the position of the emergency stop button (TRES models only).
CC	Crank cycle
CO-3		Fault displayed if the CO parameter is set incorrectly	Shutdown
CO-6		Fault displayed if the CO parameter is set incorrectly	Shutdown
HB	High battery voltage warning	Displayed if engine starting battery voltage rises above 16 VDC for more than 30 seconds when engine is running.	Warning	Check the battery rating and condition; check battery charger operation.
HE	High engine temperature shutdown	Shutdown occurs if the engine coolant temperature exceeds the maximum for more than 5 seconds. Active after engine reaches crank disconnect speed.	Shutdown	Check for blocked air inlets and exhaust outlets.
LB	Low battery voltage warning	Displayed if engine starting battery voltage falls below 11 VDC for more than 30 seconds when engine is not running.	Warning	Check the battery rating and condition; check battery charger operation; charge or replace battery.
LCL	Low coolant level	Not used on air-cooled models	Shutdown
LO P	Low oil pressure shutdown	Shutdown occurs if a low oil pressure condition exists for more than 5 seconds. Active 30 seconds after crank disconnect speed. Does not protect against low oil level.	Shutdown	Check for leaks in the lubrication system. Check the oil level and add oil if the level is low.
LOC	Loss of coolant	Not used on air-cooled models	Shutdown
LOP	Low oil pressure shutdown	Shutdown occurs if a low oil pressure condition exists for more than 5 seconds. Active 30 seconds after crank disconnect speed.	Shutdown	Check for leaks in lubrication system; check oil level and add oil if low.
OC	Overcrank shutdown	Shutdown after 3 unsuccessful starting attempts (15s crank, 15s rest each). Also on locked rotor if no engine rotation sensed during cranking.	Shutdown	Check fuel supply, spark plug, battery, loose connections. Contact dealer if problem continues.
OF	Overfrequency shutdown	Shutdown occurs when governed frequency exceeds 110% of system frequency setpoint for more than 5 seconds. Active 10 seconds after engine start.	Shutdown	Contact an authorized distributor/dealer for service if problem continues.
OS	Overspeed shutdown	Shutdown occurs if engine speed exceeds 110% of normal running speed for more than 0.3 seconds.	Shutdown	Contact an authorized distributor/dealer for service if problem continues.
OU	Overvoltage shutdown	Shutdown occurs if voltage exceeds 120% of system nominal voltage for more than 2 seconds.	Shutdown	Contact an authorized distributor/dealer for service if problem continues.
SCF0	Software Communication Fault 0	Indicates a software or communication problem within the controller.	Shutdown	Replace the controller.
UF	Underfrequency shutdown	Shutdown occurs if governed frequency falls below 54 Hz for more than 5 seconds, or below 56.5 Hz for more than 60 seconds. Active 10 seconds after engine start.	Shutdown	Reduce load and restart; contact dealer if problem continues.
UU	Undervoltage shutdown	Shutdown occurs if voltage falls below 80% of nominal system voltage for more than 10 seconds.	Shutdown	Reduce load and restart; contact dealer if problem continues.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

ADC-RES Controller Configuration (Cn setting) adjustment

⚠ The controller automatically exits configuration mode without saving changes after about 1 minute if no buttons are pressed.

Enter the configuration mode while the engine is not running by following the Figure 26 sequence.
Step through the parameters to the communication setting Cn parameter.
Use the up and down arrow buttons to change the Cn setting to Cn01, if necessary.
Press to SAVE CHANGES (YES) before exiting the configuration mode.
Move the generator set master switch to OFF/RESET.

Controller Configuration adjustment

⚠ Be sure to save the new settings immediately before exiting the configuration mode; changes are lost if the controller times out (about 1 minute).

Hold the Select button and move the master switch to RUN to enter configuration mode.
Press the down arrow key then the up arrow key 3 times to enter configuration mode (password).
Set the voltage/frequency parameter Uu for the model.
Set the unit configuration parameter Uc (marine, standby, mobile).
Set the engine type parameter Ec.
Press the up arrow at the Adnc display to enter advanced configuration mode.
Set the engine data input type Ed.
Set the battery voltage Bt (12 or 24 VDC).
Set the communications parameter Cn.
Enter save mode and save your settings before exiting.

Frequency Adjustment Procedure adjustment

⚠ Hazardous voltage. Operate the generator set only when all guards and electrical enclosures are in place.

Tools: frequency meter

Open the generator set line circuit breaker.
Attach a frequency meter to the AC output leads.
Start and run the generator set until normal operating temperature (at least 10 minutes).
Use the ADC controller to adjust the electronic governor speed (parameter 4P) for 60 Hz (or 50 Hz).
Check stability with no load; decrease gain (parameter 5P) until stable if speed hunts or surges.
Repeat steps 4 and 5 to obtain rated frequency and stable operation.
Save the settings.
Apply rated load and observe frequency; no load and full load frequencies should be within 0.4 Hz of rated.
Check for hunting and surging at full load; increase gain until engine hunts, then decrease in small steps.
Remove the load and observe frequency; repeat step 4 if frequency changed.

Fuel Conversion Procedure (Models with Fuel Block) adjustment

⚠ Explosive fuel vapors. Use extreme care when handling, storing, and using fuels.

Disable genset: master switch OFF, disconnect battery charger, disconnect battery negative lead first.
Turn off fuel supply.
Remove hose clamp and fuel hose from hose fitting in the fuel metering valve.
Remove hose fitting from the natural gas outlet port.
Remove plug from LP port; clean, apply pipe sealant, install plug into natural gas port.
Clean hose fitting, apply pipe sealant, install fitting into LP port.
Slide hose onto fitting and secure with clamp.
For 12 kW models: connect DSAI leads together for natural gas (disconnect for LP).
Connect and turn on new fuel supply; reconnect battery negative last; reconnect battery charger.
Start genset and check for leaks using a gas leak detector.

Fuel Conversion Procedure (natural gas to LP vapor) adjustment

⚠ Do not adjust the factory-sealed fuel-metering adjustments on the fuel block.

⚠ Explosive fuel vapors can cause severe injury or death.

⚠ Accidental starting can cause severe injury or death.

Tools: Gas leak detector

Place the master switch in OFF, disconnect battery charger power, disconnect battery (negative lead first), and turn off fuel supply.
Remove the hose clamp and fuel hose from the hose fitting in the fuel block.
Remove the hose fitting from the natural gas outlet port in the fuel block.
Remove the plug from the LP port, clean it, apply fresh pipe sealant, and install it into the natural gas outlet port.
Clean the hose fitting, apply fresh pipe sealant to the threads, and install it into the LP port.
Slide the hose onto the fitting and secure it with the clamp.
For 12RES only: connect the DSAM leads together for natural gas (disconnect for LP vapor).
Connect and turn on the new fuel supply; recheck the master switch is OFF.
Reconnect the battery (negative lead last) and reconnect battery charger power.
Start the generator set by moving the master switch to RUN and check for leaks with a gas leak detector.
Move the generator set master switch to the AUTO position.

Fuel Metering Valve Adjustment Procedure adjustment

⚠ Adjusting fuel metering valves on emission-certified gensets may void the emission certification. Only trained authorized technicians may adjust.

Tools: Digital voltmeter (DVM), UEGO oxygen sensor service kit GM29385, Load bank

Disable genset (master switch OFF, disconnect battery charger).
Remove oxygen sensor plug from exhaust manifold and install oxygen sensor.
Connect oxygen sensor to engine starting battery, control module, and voltmeter.
Reconnect battery charger, start genset, and run to normal operating temperature.
Apply rated load; measure oxygen sensor output voltage (potential to ground).
Adjust fuel metering valve to obtain specified oxygen sensor output.
Seal metering valve adjustment screws with thread sealant.
Remove load and cool genset 5-10 minutes; stop genset.
Disconnect battery negative lead first; allow exhaust to cool.
Remove oxygen sensor and reinstall exhaust plug with antiseize; reconnect battery negative lead last and battery charger.

Mechanical Governor Arm Adjustment Procedure adjustment

⚠ Accidental starting can cause severe injury or death.

Tools: Nail

Make sure throttle linkage is connected to governor arm and carburetor throttle lever.
Loosen the hex nut holding the governor lever to the cross shaft.
Move governor lever toward carburetor as far as it will go (wide open throttle) and hold.
Insert a nail into the hole in the cross shaft and rotate the shaft counterclockwise as far as it will turn; tighten hex nut and remove nail.

Output Voltage and Frequency Adjustment adjustment

⚠ The generator set must be running during these adjustments.

⚠ The engine speed (frequency) adjustment menus are not accessible on models with mechanical governors.

Tools: multimeter

Move the master switch to RUN; the engine starts and runtime hours display.
Hold the Select button about 5 seconds until the program version number displays.
Press the down arrow key then the up arrow key 3 times to enter adjustment mode.
1P: adjust voltage coarse in large increments (approximately 5-7 volts per step).
2P: adjust voltage fine in smaller increments (approximately 0.5-0.7 volts per step).
Adjust voltage stability (gain) coarse and fine.
3P: set volts/Hz (00=low, 09=high).
4P: adjust engine governor speed coarse and fine.
5P: adjust engine governor stability (gain) coarse and fine.
Enter SAVE mode and save settings before exiting the adjustment mode.

Procedure to Convert from NG to LP adjustment

⚠ Explosive fuel vapors. Can cause severe injury or death. Use extreme care when handling, storing, and using fuels.

⚠ Accidental starting. Disconnect the battery cables before working on the generator set; remove the negative (--) lead first.

Tools: Gas leak detector, Wrench (to hold fuel solenoid valve)

Place the generator set master switch in the OFF position.
Disconnect the power to the battery charger.
Disconnect the generator set engine starting battery, negative (--) lead first.
Turn off the fuel supply.
Remove the hose clamp and fuel hose from the hose fitting.
Place the orifice into the hose fitting.
Slide the hose onto the hose fitting and secure it with the clamp.
Disconnect the digital spark-advance module (DSAI) leads for LP (connect the leads for natural gas).
Connect and turn on the new fuel supply.
Check that the generator set master switch is in the OFF position.
Reconnect the generator set engine starting battery leads, negative (--) lead last.
Reconnect power to the battery charger.
Start the generator set by moving the generator set master switch to the RUN position.
Check for leaks using a gas leak detector.
Move the generator set master switch to the OFF/RESET position to shut down the generator set.

Spark Plug Gap Adjustment adjustment

Tools: wire feeler gauge

Clean area around spark plug base.
Remove spark plug and inspect condition.
Replace plug if worn or reuse is questionable.
Check gap with wire feeler gauge.
Adjust gap to 0.76 mm (0.030 in.) by bending ground electrode.
Reinstall spark plug.

Voltage Adjustment Procedure adjustment

⚠ Hazardous voltage. Operate the generator set only when all guards and electrical enclosures are in place.

Tools: digital voltmeter, frequency meter

Connect a digital voltmeter from one side of the circuit breaker to the L0 terminal inside the controller assembly.
Start the generator set.
Enter the adjustment mode and increase or decrease voltage (parameter 1P) to the desired voltage.
Adjust the voltage gain (parameter 2P) until light flicker minimizes; save settings.
Check and readjust the voltage if necessary.
Set voltmeter to frequency; adjust engine governor speed (parameter 4P) to the cut-in frequency.
Set voltmeter to voltage; adjust volts/Hz (parameter 3P) until voltage begins to drop.
Set voltmeter to frequency; adjust engine governor speed (parameter 4P) to the operating frequency (50 or 60 Hz).
Readjust voltage gain (parameter 2P) until light flicker minimizes.
Check voltage; readjust voltage (parameter 1P) if necessary.
Save the settings.
Stop the generator set.

Governor System Operation Test Procedure diagnostic

⚠ Hazardous voltage. Operate the generator set only when all guards and electrical enclosures are in place.

Tools: voltmeter, feeler gauge

Verify carburetor throttle linkage is connected to the stepper motor.
Look for broken or loose wiring or plug connections if stepper motor moves erratically.
Check stepper motor operation at startup; note throttle positions.
If throttle moves fully open then steps to and stays fully closed, check the magnetic pickup.
Connect a voltmeter to the magnetic pickup leads; check for 1.75 volts AC minimum during cranking.
If below 1.75 VAC, verify magnetic pickup air gap is 0.5 mm (0.020 in.); adjust as needed.
After adjusting gap, recheck voltage; replace magnetic pickup if still below 1.75 VAC.
Disconnect magnetic pickup leads and open circuit breaker to test controller governing function.
Move throttle shaft/stepper motor fully counterclockwise (closed throttle).
Start the generator set; stepper motor should step clockwise to wide open throttle and remain there.
Place master switch in STOP; check stepper motor connections (leads 1A, 1B, 2A, 2B to P1-4, P1-5, P1-6, P1-7).
Check stepper motor coil resistance across pins 2 and 3 and across pins 1 and 4.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
		ATS emergency source lugs EL1 and EL2	6 ga. Red and Black	Torque to 12 Nm (9 ft lbs)
		Continuous power mode jumper	P7 pins 1 and 2	Remove for power-down; connect pins 2 and 3 for storage if three-pin connector.
		DSAI (Digital Spark Advance) leads	65 and N5	Connect for natural gas; disconnect for LP
		Engine start leads 3 and 4 to the ATS	14 ga. Red and White/Red	Terminals ES3 and ES4 on P2, torque connector screws to 0.8 Nm (7 in lb)
		Field-connection terminal block — L1 and L2	Leads from transfer switch emergency source lugs to L1 and L2	See decal near the terminal block for connections
		Ground	6 ga. Uninsulated
		Neutral	6 ga. White
		Remote start	Controller leads 3 and 4	Connect leads 3 and 4 from the ADC 2100 controller to the ATS engine start terminals or a remote start/stop switch.
		Remote start/stop	3 and 4	Connect to ATS engine start terminals or remote start/stop switch.
	single	AC output to line circuit breaker	L1/L2 black	Connect to AC circuit breaker load side.
	single	Equipment ground	green	Connect to equipment ground terminal labeled GRD.
	single	Neutral	L0 white	Connect ATS and main panel L0 leads to neutral terminal.
	single phase	AC output leads to AC circuit breaker	L1/L2 (black)	Connect output leads going to the transfer switch to the AC circuit breaker load side; route through flexible conduit to circuit breaker box.
	single phase	Equipment ground	Green	Connect the green lead to the equipment ground terminal (labeled GRD).
	single phase	Field-connection terminal block	L1, L2 (load), L0 (neutral), GRD (ground), terminals 3 and 4 (engine start)	Connect transfer switch emergency source leads to L1 and L2; neutral L0 and ground GRD from ATS and main panel; engine start leads to terminals 3 and 4. Generator sets shipped with neutral bonded to ground in junction box; neutral may be grounded or lifted/is isolated if installation requires ungrounded neutral. See Section 2 wiring diagrams: 12RESL/12RESM1 schematic ADV-7325, point-to-point GM51414; 18RESL schematic ADV-7353, point-to-point GM52541.
	single phase	Neutral	L0 (white)	Connect the L0 white leads from the ATS and the main panel to the neutral terminal.
100 VAC	1	1Ph, 2W		Uu00; 60 Hz
100 VAC	1	1Ph, 3W		Uu00; 60 Hz
100/200 VAC	1	1Ph, 3W		Uu08; 60 Hz
110	Single (L0-L1)	Factory two-pole circuit breaker		50 Hz; not reconnectable
110	Single (L0-L2)	Factory two-pole circuit breaker		50 Hz; not reconnectable
110 VAC	1	1Ph, 2W		Uu05; 50 Hz
110 VAC	1	1Ph, 3W		Uu05; 50 Hz
110 volt	1	L0-L1		50 Hz; 3-wire configuration; 8.5/12RES not reconnectable
110 volt	1	L0-L2		50 Hz; 3-wire configuration; 8.5/12RES not reconnectable
110/190 VAC	3	Wye		Uu17; 50 Hz
110/220 VAC	1	1Ph, 3W		Uu07; 50 Hz
110/220 VAC	1	Dogleg		Uu07; 50 Hz
110/220 VAC	3	Delta		Uu15; 50 Hz
115 VAC	1	1Ph, 2W		Uu05; 50 Hz

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 size generator is the Kohler 12RES?

The Kohler 12RES is rated 12 kW standby (12.0 kVA).

What engine does the Kohler 12RES use?

The Kohler 12RES is powered by the Kohler CH 740 engine.

What fuel does the Kohler 12RES use?

The Kohler 12RES runs on natural gas or propane (LP) vapor.

How much oil does the Kohler 12RES take?

The Kohler CH 740 engine in the Kohler 12RES has an oil capacity of 2.0 liters.

What is the continuous rating of the Kohler 12RES?

The Kohler 12RES is rated 10.4 kW prime (10 kVA), against 12 kW standby.

How loud is the Kohler 12RES?

The Kohler 12RES is rated at 65.0 dBA at 23 ft m, per the manufacturer specification sheet.

How much does the Kohler 12RES weigh?

The Kohler 12RES has a dry weight of 182 kg (401 lb).

What voltages is the Kohler 12RES available in?

The Kohler 12RES is offered in 246/242 V, 1-phase.

What size battery does the Kohler 12RES need?

The Kohler 12RES uses 1 battery, 12 VDC V each, 525 minimum at -18 C (0 F) CCA, group 26, per the manufacturer specification sheet. The starting system is 12 V DC.

Which alternator is fitted to the Kohler 12RES?

The Kohler 12RES uses a 2F4 alternator. It has 2 poles. Insulation class Class 180 (H).

What oil filter fits the Kohler 12RES?

The Kohler 12RES uses oil filter part number 12 050 01.

What fuel filter does the Kohler 12RES use?

The Kohler 12RES uses fuel filter part number GM29253.

What air filter does the Kohler 12RES use?

The Kohler 12RES uses air filter part number ADV-6823-A.

Troubleshooting

Fault codes

Code	Meaning	Remedy
HE	High engine temperature shutdown — Shutdown occurs if the engine coolant temperature exceeds the maximum temperature for more than 5 seconds. This protective becomes active after the engine reaches the crank disconnect speed.	Check for blocked air inlets and exhaust outlets.
LO P	Low oil pressure shutdown — Shutdown occurs if a low oil pressure condition exists for more than 5 seconds. This protective becomes active 30 seconds after the engine has reached crank disconnect speed (30 second inhibit). Note: The low oil pressure shutdown does not protect against low oil level. Check the oil level at the engine.	Check for leaks in the lubrication system.; Check the oil level and add oil if the level is low.
OC	Overcrank shutdown — Shutdown occurs after 3 unsuccessful starting attempts. The crank cycle is set for three starting attempts of 15 seconds cranking and 15 seconds rest.	Check the fuel supply, spark plug, and battery.; Check for loose connections.; Contact an authorized distributor/dealer for service if problem continues.
OC	Locked rotor — The generator set also shuts down on OC if no engine rotation is sensed during cranking. Shuts down 3 seconds after the fault is detected.	Contact an authorized distributor/dealer for service if problem continues.
OF	Overfrequency shutdown — Shutdown occurs when the governed frequency exceeds 110% of the system's frequency setpoint for more than 5 seconds. This protective becomes active 10 seconds after engine start (10 second inhibit).	Contact an authorized distributor/dealer for service if problem continues.
OS	Overspeed shutdown — Shutdown occurs if the engine speed exceeds 110% of the normal running speed for more than 0.3 seconds.	Contact an authorized distributor/dealer for service if problem continues.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Kohler 12RES troubleshooting guide (361 entries) →

Repair guides

108

Step-by-step procedures compiled from the Kohler service manual for this model.

Parts

250

Part #	Description	Qty	System
103-0731	Gasket, Gearcase	1	Gasket	Amazon eBay
103-0733	Gasket, Gearcase Backplate	1	Gasket	Amazon eBay
103-0746	Gearcase (Includes Oil Seal and Oil Fill Tube)		Seal	Amazon eBay
110-1718	Head, Cylinder Gasket, Cylinder Head	2	Gasket	Amazon eBay
110-2987	Gasket, Cylinder Head	2	Gasket	Amazon eBay
110-3225	Gasket, Cylinder Head	1	Gasket	Amazon eBay
12 050 01	Oil Filter	1	Oil filter	Amazon eBay $19.06 KuduParts $11.00 FridayParts $33.98
12 050 01-S	Filter, oil	1	Oil filter	Amazon eBay $19.06 KuduParts $32.00 FridayParts $33.98
12 132 02-S	Spark Plug	1	Spark plug	buy
120-0491	Pump, Oil	1	Pump	Amazon eBay $30.00
120-1041	Bearing, Oil Pump Idler Gear (Semi Finished)	1	Pump	Amazon eBay
130-0755	8racket, Mounting Heater, Tank - 850 Watt, 115 Volt (Includes Hose Connector, Cord and Mounting Strap)	1	Hose	Amazon eBay
130-2500	Guard, Belt (Left Side)	1	Belt	Amazon eBay
134-1437	Spring - Injecion Pump Lever	1	Pump	Amazon eBay
140-1787	Hood, Air Cleaner	1	Air filter	Amazon eBay
140-1791	Indicator Service	1	Sensor	Amazon eBay
140-1841	Cleaner. Air (Includes Element)	1	Air filter	Amazon eBay $50.00
140-2174	Cleaner, Air - Oil Bath Band. Mount ing	1 2	Air filter	Amazon eBay
140-2234	Tube. Air Inlet		Hose	Amazon eBay
141-0982	Gasket	2	Gasket	Amazon eBay
141-0983	Gasket, Carburetor	1	Gasket	Amazon eBay
147-0436	Seal, Injector	6	Seal	Amazon eBay
147-0465-12	Pump, Fuel Injection (See Separate Page for Components)	1	Pump	Amazon eBay
147-0701	Injector, Fuel (Includes Seal)	6	Seal	Amazon eBay
147-0856	Injector, Fuel (Includes Parts Marked #)	2	Injector	Amazon eBay FridayParts $72.02
147-0864	#O'Ring, Injector	2	Injector	Amazon eBay
147-0865	#O'Ring, Injector	2	Injector	Amazon eBay
147-2715	Remote Fuel Pump Kit EFI (HGJAA)	1	Fuel pump	Amazon eBay
149-1445	Filter	1	Fuel filter	Amazon eBay $19.95
149-1446	Gasket, Cover	1	Gasket	Amazon eBay
149-1828	Pump, Fuel (Electric)	1	Pump	Amazon eBay $39.59 FridayParts $40.41
149-1914-04	Element, Filter (Includes O-fling Seal) (2 M~CPXI)	1	Seal	Amazon eBay
149-1920	Plate, Mounting - Fuel Filter Elbow, Hose - Male	1	Fuel filter	Amazon eBay
149-1921	Plate, Mounting - Fuel Filter Elbow, Hose - Male	1	Fuel filter	Amazon eBay
149-1922	Spacer, Mounting - Fuel Filter	1	Fuel filter	Amazon eBay
149-1949	Head Assembly. Replacement (Includes Vent Plug. O-Ring Seals. Pump Assembly and Tube) Seal)	1	Seal	Amazon eBay
149-1953	Drain Assy (Includes Knob and Seal)	1	Seal	Amazon eBay
149-2100	Filter Assembly, Fuel Element. Filter	1	Fuel filter	Amazon eBay
149-2106	Element	1	Fuel filter	Amazon eBay $34.99 NAPA $61.61 KuduParts $68.00
149A159	Gasket - Spacer - BLAKING mfr. pump only	2	Gasket	Amazon eBay
149A551	Lever, Hand Primer - ONAN mfr. pump only	1	Pump	Amazon eBay
149D693	Pump, Fuel - ONAN mfr., with primer lever - Replaces earlier atyle pumps used, of any manufacture	1	Pump	Amazon eBay
149K526	Repair Kit, Fuel Pump	1	Fuel pump	Amazon eBay
149K74	Repair Kit, Fuel Pump - Includes parts marked (* anda) - For AC mfr., BLAKING mfr. or ONAN mfr. pumps	1	Fuel pump	Amazon eBay
151-0437	Kit, Throttle Modification (Fuel Injection Pump)	1	Fuel pump	Amazon eBay
1512-0154	Belt Fan	1	Belt	Amazon eBay
154-3067-02	Manifold Assy, Intake (Includes Hose Connector)	1	Hose	Amazon eBay
154-3085	Gasket, Intake Manifold	2	Gasket	Amazon eBay
154P570	Union, Manifold Flange	2	Exhaust	Amazon eBay
155-2073	Gasket, Exhaust Pipe	1	Gasket	Amazon eBay
155-2415	Seal, Muffler Support	18	Seal	Amazon eBay
155-2619	Spec D, Exhaust Manifold) *Gasket. Elbow - Exhaust (WC 0)	1	Gasket	Amazon eBay
15SA47	Tube, Flexible Exhaust	2	Exhaust	Amazon eBay
165-2203	Gasket, Manifold - Exhaust (&xx A-C)	:	Gasket	Amazon eBay
167-0272	Spark plug	2	Spark plug	Amazon eBay
168-0174	Kit, Gasket - Valve Grind	1	Gasket	Amazon eBay
185-2175	Gasket	1	Gasket	Amazon eBay
185-2199	Band, Mounting - Air Cleaner	1	Air filter	Amazon eBay
185-2203	Gasket, Manifold - Exhaust (&xx A-C)	1	Gasket	Amazon eBay
185-2239	Clamp, Hose	1	Hose	Amazon eBay
185-2240	Clamp, Hose	2	Hose	Amazon eBay
185-2266	Alternator (12 VDC) (See Separate Page for Components)	1	Alternator	Amazon eBay
185-2284	Gasket	2	Gasket	Amazon eBay
185-2300	Clamp, Hose	1	Hose	Amazon eBay
185-2311	Housing, Thermostat	1	Thermostat	Amazon eBay FridayParts $27.75
185-2421	Hose, Rubber - Overflow	1	Hose	Amazon eBay
187-6224	Gasket, Rocker Cover	1	Gasket	Amazon eBay
187-6230	Gasket, Cylinder Head (1)	1	Gasket	Amazon eBay
187-6238	Gasket, Breather Plate	1	Gasket	Amazon eBay
191-1368	Arm, Alternator Adjusting	1	Alternator	Amazon eBay
191-1872	Alternator (12 VDC) (Gl)	1	Alternator	Amazon eBay
191-1983-01	Alternator	1	Alternator	Amazon eBay
191-2085	Strap, Alternator Adjust	1	Alternator	Amazon eBay
193-0247	'Sender, Temperature - Engine Coolant	1	Sensor	Amazon eBay
193-0469	Sensor, Map	1	Sensor	Amazon eBay
193-0480	Sensor, Manifold Air Temperature	1	Sensor	Amazon eBay
24 032 19-S	Seal, oil front	1	Seal	FridayParts $10.99
24 050 01-S	Filter, breather	8	Filter	buy
24 083 02	Precleaner element	1	Air filter	buy
24 083 02-S	Precleaner	8	Air filter	buy
24 083 05-S	Precleaner	8	Air filter	buy
24 083 08	Air cleaner element	1	Air filter	buy
24 083 08-S	Element, air filter	1	Air filter	buy
24 083 09-S	Element, air filter	1	Air filter	buy
24 153 01-S	O-ring	1	Seal	buy
24 153 08-S	O-ring	1	Seal	buy
24 153 21-S	O-ring, oil cooler	1	Seal	buy
24 393 51-S	Kit, oil pump assembly (includes items 12, 13)	1	Pump	buy
24 590 01-A	Oil Cooler, 14RCA/L		Oil cooler	buy
24 590 27	Dipstick		Oil dipstick	buy
24 590 29	Oil Fill	1	Oil fill	buy
241927	Sensor, speed	1	Sensor	Amazon eBay $75.00
25 032 06-S	Seal, oil	1	Seal	FridayParts $11.90
25 099 26-S	Switch, oil pressure	1	Sensor	buy
25 132 14-S	Spark plug	2	Spark plug	buy
25 158 08-S	Bushing, linkage retaining	4	Bushing	buy
25 435 06-S	Kit, starter solenoid	1	Kit	buy
269373	Alternator Assembly	1	Alternator	Amazon eBay
300-2880	Board, Voltage Regulator (VR21)	1	Avr	Amazon eBay FridayParts $350.50
300-2906	Board Assy, Printed Circuit - Over/Under Volt Sensor (A17)	i	Sensor	Amazon eBay
302-0750	'Sender, Tachometer	1	Sensor	Amazon eBay
304A66	Resistor, 4xELI	1	Resistor	Amazon eBay
305-0491	REGULATOR. 305-0491	1	Avr	Amazon eBay
305-0901	Sensor, Low Battery Voltage	1	Sensor	Amazon eBay
307-1061	Relay, Starter Protection	1	Starter	Amazon eBay
307P820	Relay, Adjustabe Start Disconnect & Crankshaft Limiter	1	Relay	Amazon eBay
309-0178	Switch, High Water Temperature Top Mounted On Water Outlet Housing	1	Sensor	Amazon eBay $350.00
309-0179	Switch, High Water Temperature (Standard Part) Side Mounted On Water Outlet Housing	1	Sensor	Amazon eBay
309-0269	Sender, Temperature-Lo Engine	1	Sensor	Amazon eBay $239.00
322-17	Bulb, (2) Panel ( I ) Pilot	2	Lamp	Amazon eBay
322P69	Bracket, Mounting - Engine	1	Bracket	Amazon eBay
323-1591	# Plug, Seal (E1)	1	Seal	Amazon eBay
323-1708	# Seal, Cable (P8)	4	Seal	Amazon eBay
332AI006	Block, Terminal	1	Block	Amazon eBay
332AI009	Block, Terminal	1	Block	Amazon eBay
358072	3/8"-16 UNC-2A THD Thrubolt	1	Bolt	Amazon eBay
420A248	Air filter	1	Air filter	Amazon Amazon eBay eBay
501-0225	45' Lg - With Both Ends 1/8' NPT Male Fittings	1	Belt	Amazon eBay
501-0227	Line, Fuel - Flexible (24' La x 1/8' NPT Male x-1/8° NPT Male)	1	Hose	Amazon eBay
502-0068	Tee (3/8' x 5/8' x 5/8') to	1	Hose	Amazon eBay
502-0313	Elbow, Hose − 90° (1/8” Pipe to 1/4” Hose)	1	Hose	Amazon eBay
502-0433	[;b'$P&x 5/16 ID Hose]	1	Hose	Amazon eBay
502-0613	Connector, Hose	1	Hose	Amazon eBay
502-0869	Connector (3/8')	1	Hose	Amazon eBay
502-0870	Tee, Hose	1	Hose	Amazon eBay
502-1314	Connector, Hose	1	Hose	Amazon eBay
503-0183	Clamp, Hose	1	Hose	Amazon eBay
503-0365	Clamp, Hose	1	Hose	Amazon eBay
503-0594	Hose, Rubber - Preformed	1	Hose	Amazon eBay
503-059b	Hose, Rubber - Preformed	1	Hose	Amazon eBay
503-0685	Clamp, Hose	1	Hose	Amazon eBay $15.00
503-1058	Spacer, Fan Hose, Radiator - Upper	1	Hose	Amazon eBay
503-1062	Hose - Intake Manifold Water Pump (3/8' ID)	1	Hose	Amazon eBay
503-1074	Hose Reducer	1	Hose	Amazon eBay
503-1084	Elbow. Reducer		Hose	Amazon eBay
503-1250	Hose, Water Bypass (5/8' Ill)	1	Hose	Amazon eBay
503-1251	Hose, Water Bypass (5/8' 10]	1	Hose	Amazon eBay
503-1450	Hose, Cleaner - Air	1	Hose	Amazon eBay
503-1552-01	Ho!M? (5/8' ID X 14')	2	Hose	Amazon eBay
503-2126	Hose, Vacuum	1	Hose	Amazon eBay
503-365	Clamp, Hose	2	Hose	Amazon eBay
505-0180	Plug, Pipe (1-1/4"), Air Cleaner Adapter and Intake Manifold	1	Air filter	Amazon eBay
505-382	Nipple, Exhaust(3"x 2-5/8")	2	Exhaust	Amazon eBay
505-4	Hose (Order 6 “of Bulk Hose Number 503-324)	I 9	Hose	Amazon Amazon eBay eBay
509-0125	Key, Handle - Screw, Lock (3/8 - 16 x .75")	1	Seal	Amazon eBay
509-0191	Seal, Oil (Includes Wear S1eeve )	1	Seal	Amazon eBay
509-0196	O'Ring	1	Seal	Amazon eBay
511-0112	Belt, Fan	1	Belt	Amazon eBay
515-0094	Key, Crankshaft Woodruff Belt	1	Belt	Amazon eBay
52 099 08-S	Switch, oil pressure	1	Sensor	buy
520-2403	Stud, Injection Pump (M8)	3	Pump	Amazon eBay
718-1069	Fan Pldl@y Sell. Vee Smwv, Cap Hex Head (M8 X I 25 X 25]	1	Belt	Amazon eBay
750-1004	Nut, Hex (M6 x 1) Washer, Lock - Spring (M6) Adapter, Hose Hose, Rubber - Preformed	1	Hose	Amazon eBay
ADV-6823-A	Air Filter, Spark Plug Location	1	Air filter	Amazon eBay
BKR-8YU11	Spark Plug, CH20/CH740	4	Spark plug	Amazon eBay
GM102176	Oil pressure sensor boot	1	Sensor	Amazon eBay
GM103743	Emergency Stop Switch (optional)	1	Emergency stop switch	Amazon eBay $59.99
GM110973-CMP	Fuel regulator and LPG orifice	1	Coolant filter	Amazon eBay
GM111084	Shutdown Switch	1	Shutdown switch	Amazon eBay
GM114161	Fuel selector		Air filter	Amazon eBay
GM118705	Spark Plugs	1	Spark plug	Amazon eBay
GM20990	Gasket	4	Gasket	Amazon eBay
GM28823	Sensor, oil temperature	1	Sensor	Amazon eBay $50.00
GM28981	UEGO sensor interface harness		Sensor	eBay
GM29253	Fuel orifice fitting		Fuel filter	Amazon eBay
GM29253-GA2	Controller Wiring Diagram	1	Controller wiring diagram	Amazon eBay
GM29358-B	Point-to-Point Wiring Diagram, Single Phase	1	Point-to-point wiring diagram	Amazon eBay
GM29385	UEGO oxygen sensor service kit		Sensor	eBay
GM51559	3/8"-16 UNC-2A THD Thrubolt	1	Thrubolt	Amazon eBay
GM80980	Brush(es)	1	Brush	Amazon eBay
GM90969-KP1-QS	3" Concrete Mounting Pad (only comes in quantities of 5)		Physical	Amazon eBay
GM90969-KP2-QS	4" Concrete Mounting Pad (only comes in quantities of 5)		Physical	Amazon eBay
GM92228-KP1-QS	3" Concrete Mounting Pad (only comes in quantities of 5)		Physical	Amazon eBay
GM92228-KP2-QS	4" Concrete Mounting Pad (only comes in quantities of 5)		Physical	Amazon eBay
KO3226	Electric Starter Service Kit	1	Battery	Amazon eBay
RSP-FT-02-US-91	Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter.		Air filter	Amazon eBay
RSP-FT-04-US-91	Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter.		Air filter	Amazon eBay
X-386-109	Fuel line, flexible	1	Hose	Amazon eBay
X-386-112	Line, flex (50.0")	1	Hose	Amazon eBay
X-386-128	Line, flex (42.0")	1	Hose	Amazon eBay
X-6422-31	Seal		Seal	eBay
098-7130	Label, Warning Heat	1	Service part / kit	Amazon eBay
098-7369-01	HDCAC	2	Service part / kit	Amazon eBay
098-7374	Label, Warning	1	Service part / kit	Amazon eBay
098-7375	Label, Switch	1	Service part / kit	Amazon eBay
098-7376	Label, Circuit Breaker	1	Service part / kit	Amazon eBay
098-7398-01	HDCAA	2	Service part / kit	Amazon eBay
098-7398-02	HDCAB	2	Service part / kit	Amazon eBay
098-7399-01	45A, 2 Pole	1	Service part / kit	Amazon eBay
098-7399-02	50A, 2 Pole	1	Service part / kit	Amazon eBay
098-7461	Label, Warning Hazardous Voltage	1	Service part / kit	Amazon eBay
098-7462	Label, Service Information Label, Model Ident	1	Service part / kit	Amazon eBay
098-7463	Label, Fuel Attachment	1	Service part / kit	Amazon eBay
098-7464	Label, Coolant Drain	1	Service part / kit	Amazon eBay
098-7465-03	Label, Control Face	1	Service part / kit	Amazon eBay
098-7466	Label, Control Rear	1	Service part / kit	Amazon eBay
098-7497-01	Label, Warning Install	1	Service part / kit	Amazon eBay
098-7498-01	Label, Warning Hazardous	1	Service part / kit	Amazon eBay
098-7515-01	Label, Warning Voltage	1	Service part / kit	Amazon eBay
1-24-67	Crankshaft	1	Service part / kit	Amazon eBay
10-24-658	Air Intake	1	Service part / kit	Amazon eBay
101-0439	Plate, Rear Bearing Bearing, Crankshaft	1	Service part / kit	Amazon eBay NAPA $95.66
102-0778	Adapter, Pipe - Oil Drain	1	Service part / kit	Amazon eBay
104-0032	Gear, Crankshaft	1	Service part / kit	Amazon eBay NAPA $260.36
104-0091	Washer, Flat (Special)	4	Service part / kit	Amazon eBay
104-1953	Washer, Flat (1/2' ID x 2.25' OD)	1	Service part / kit	Amazon eBay
104-1958	Marked ) Spec A/B Begin Spec C Pulley Assy, Drive (Includes	1	Service part / kit	Amazon eBay
104-2000	Marked ) Spec A/B Begin Spec C Pulley Assy, Drive (Includes	1	Service part / kit	Amazon eBay
105-0058	Plunger, Camshaft	1	Service part / kit	Amazon eBay
105-0059	Spring, Plunger	1	Service part / kit	Amazon eBay
105-0508	Shaft, Idler Gear	1	Service part / kit	Amazon eBay
105-0513	Gear, Idler (Includes Finished 8earing)	1	Service part / kit	Amazon eBay
105-0519	8earing, Idler Gear (Semi Finished)	1	Service part / kit	Amazon eBay
105-0541	Washer, Thrust	1	Service part / kit	Amazon eBay
105-0641	Gear (Includes Spacer and Plate)	1	Service part / kit	Amazon eBay
105-0676	Camshaft	1	Service part / kit	Amazon eBay
10S-2283	Cap	1	Service part / kit	Amazon eBay
11-24-3	Exhaust	1	Service part / kit	Amazon eBay
110-0904	Rotocap, Exhaust	2	Service part / kit	Amazon eBay NAPA $116.06 FridayParts $124.86
110-1719	Valve, Exhaust	2	Service part / kit	Amazon eBay
110-2181-03	.50 MM Oversize	6	Service part / kit	Amazon eBay
110-2781-01	Standard	6	Service part / kit	Amazon eBay
110-2781-02	.25 MM Oversize	6	Service part / kit	Amazon eBay
110-3045	Standard	1	Service part / kit	Amazon eBay FridayParts $124.86
110-3226-01	Standard	6	Service part / kit	Amazon eBay
110-3226-02	.25 MM Oversize	6	Service part / kit	Amazon eBay
110-3226-03	.50 MM Oversize	6	Service part / kit	Amazon eBay
110-3245	Cap, Valve Stem (Not used on some early models)	1:	Service part / kit	Amazon eBay
110-3462	Valve, Exhaust Valve	2	Service part / kit	Amazon eBay
110-3462-01	Oversize	2	Service part / kit	Amazon eBay
110-3462-02	.005' Oversize	2	Service part / kit	Amazon eBay
110-3462-03	.010' Oversize	2	Service part / kit	Amazon eBay
110-3462-04	.025' Oversize Seat, Intake Valve	2	Service part / kit	Amazon eBay
110-3490	0.5 MM Oversize		Service part / kit	Amazon eBay
110-3655	.005' Oversize	2	Service part / kit	Amazon eBay
110-3655-05	Piston Ring Standard .005 Oversize	24	Service part / kit	Amazon eBay
110-3655-10	.010' Oversize	2	Service part / kit	Amazon eBay
112-0265	Piston (Includes Pin, Rings and Retaining Rings) Oversize Oversize Oversize Oversize	2	Service part / kit	Amazon eBay
112-0265-01	Standard Oversize	2	Service part / kit	Amazon eBay
112-0265-02	Standard Oversize	2	Service part / kit	Amazon eBay
112-0265-03	Standard Oversize	2	Service part / kit	Amazon eBay
112-0265-05	Standard Oversize	2	Service part / kit	Amazon eBay
112-0267	Standard Oversize	2	Service part / kit	Amazon eBay
112-0268	Pin, Piston Ring, Retaining	2	Service part / kit	Amazon eBay
113-0311	Standard Oversize Oversize	2	Service part / kit	Amazon eBay
113-0311-01	.010 Oversize	2	Service part / kit	Amazon eBay
113-0311-02	.020 Oversize	2	Service part / kit	Amazon eBay
113-0311-03	.030 Oversize	2	Service part / kit	Amazon eBay
113-0311-05	Standard	2	Service part / kit	Amazon eBay
114-0036	Bushing, Bearing, Connecting Rod	2	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	75%	3.2	0.85
Standby	100%	5.4	1.43

Available documents

Spec sheet (Kohler)Spec sheet — 12 res cut sheet (Kohler)Spec sheet — 12RES-NEW-resg4248 (Kohler)Spec sheet — 12RES (Kohler)Spec sheet — 85-12-kw-Kohler-Residential-Generator (Kohler)Spec sheet — Kohler 12RES New g4248 (Kohler)Spec sheet — Spec Sheet Res (Kohler)Spec sheet — g4097 (Kohler)Spec sheet — g4248 (Kohler)Operator's manual (Kohler)Operator's manual — 12 RES Operation (Kohler)Operator's manual — Op and Install manual 8.5 12 res (Kohler)Operator's manual — Operation Installation Res (Kohler)Operator's manual — RES with ADC Operation (Kohler)Operator's manual — tp6398 (Kohler)Operator's manual — tp6515 (Kohler)Operator's manual — tp6517 (Kohler)Reference (Kohler)Reference — RES Consumer Referral Rebate (Kohler)Reference — ReferralRebateForm Editable1 (Kohler)Reference — Referral Rebate Form EDITABLE (Kohler)Reference — g18146 (Kohler)Reference — g6130 (Kohler)Reference — tp6766cmp (Kohler)Reference — tp7004 (Kohler)Owner's manual — tp6331 (Kohler)Parts manual (Kohler)Parts manual — Kohler 2017 Referral Rebate Consumer RES (Kohler)Parts manual — Kohler 2019 RES Consumer Referral Rebate (Kohler)Service manual — 8.5 12 RES Service (Kohler)Service manual — PDF-202312 US Kohler Tp6967 en-US1 (Kohler)Service manual — adv9747 (Kohler)Service manual — g18118 (Kohler)Service manual — g260823 (Kohler)Service manual — tp6196 (Kohler)Service manual — tp6397 (Kohler)Service manual — tp6516 (Kohler)Service manual — tp6792 (Kohler)Service manual — tp6793 (Kohler)Service manual — tp6967 (Kohler)Service manual — tt1364 (Kohler)Service manual — tt1428 (Kohler)Service manual — tt1445 (Kohler)Service manual — tt1486 (Kohler)

This page was generated from the 44 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Kohler 12RES Generator Set

Service parts for the 12RES

Air intake

Fuel system

Oil system

Cooling system

Specifications

Engine

Same engine, other brands

Maintenance & consumables

Service intervals

Service specifications

Recommended fluids

Fault codes

Procedures

Voltage reconnection

Common questions

Troubleshooting

Fault codes

Repair guides

Parts

Fuel consumption

Available documents