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Kohler Command PRO OHV CH740 Engine

The Kohler Command PRO OHV CH740 is a 725 L engine rated at 3600 rpm. It powers generator sets from Kohler, including the 12RES and 14RES.

Also known as: KOHLER Command PRO OHV CH740

Part of the Kohler CH740 engine family — 5 variants share parts & fitment.

725.0 L

Displacement

3600 rpm

Rated speed

On this pageSpecs Generator sets FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Displacement	725.0 L
Rated speed	3600 rpm

Generator sets powered by this engine

Kohler 12RES Kohler 14RES

How to read your Kohler engine serial & model number →

Common problems

Stops suddenly
Cause: Fault shutdown
Fix: Check for a fault shutdown code on the controller’s LED display. Correct the fault and then move the generator set master switch to OFF/RESET to reset the controller.
Generator set stops suddenly
Cause: Low oil pressure shutdown
Fix: Check for oil leaks. Check the oil level and add oil if necessary
The generator set cranks but does not start, starts hard, lacks power, or operates erratically
Cause: Air cleaner clogged
Fix: Clean and/or replace the air cleaner
The generator set does not crank.
Cause: Fault shutdown
Fix: Check for a fault code on the controller display. See Section 2.6.
Operates erratically
Cause: Air cleaner clogged
Fix: Replace element.
Lacks power
Cause: Air intake restriction, inadequate cooling
Fix: Inspect air intakes and exhaust for obstructions. Check air cleaner.
Generator set stops suddenly.
Cause: Low oil pressure shutdown
Fix: Check the oil level.
Generator set does not crank
Cause: Weak or dead battery
Fix: Recharge or replace battery. If battery is weak or dead, check battery charger fuse, power supply, and operation.
No output voltage
Cause: AC output circuit breaker open
Fix: Check for AC voltage on the generator side of circuit breaker. If there is AC voltage on the generator side of the breaker, then a problem in the load circuits is causing the line circuit breaker to trip. Check for and correct short circuits or overloading on the load side before resetting the circuit breaker.
Low output or excessive drop in voltage
Cause: Generator set overloaded
Fix: Reduce the load
Cranks but does not start
Cause: No fuel
Fix: Open (turn on) manual fuel valve. Check fuel supply tank (LP).
The generator set does not crank
Cause: Battery weak or dead
Fix: Recharge or replace the battery
Starts hard
Cause: Low battery voltage
Fix: Check battery voltage and battery charger connections, power supply, and operation.
Controller LED display is off
Cause: No power to the controller: The generator set has not run for 48 hours or longer and the controller has powered down.
Fix: Controller display will automatically activate when a remote start command is received or the generator set master switch is moved to the RUN position. See Section 2.3.
The generator set cranks but does not start, starts hard, lacks power, or operates erratically.
Cause: Air cleaner clogged
Fix: Clean and/or replace the air cleaner.

Compiled from service & troubleshooting documentation across every generator set that uses the Kohler Command PRO OHV CH740.

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 (14 kW)	Change	100 hr	12 mo
Oil cooler	Clean	150 hr	12 mo	Yearly or 100 hours; 17/18 kW models
Oil cooler	Inspect	150 hr	12 mo	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	Replace	150 hr		300 hours shown; service more frequently under dusty/dirty conditions
Air cleaner service	Clean	150 hr	12 mo	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 (20 kW)	Change	150 hr	12 mo
Oil filter (17/18RES)	Replace	150 hr	12 mo	Yearly or 150 hours
Oil filter (20 kW)	Replace	150 hr	12 mo
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 (14 kW)	Replace	200 hr	12 mo
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
Generator brushes and collector ring	Replace	300 hr	12 mo	Authorized distributor only
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

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	0.03	in.
Gap	Spark plug	0.76	mm
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 specific gravity, fully charged	1.260	specific gravity	at 80°F (26.7°C)
Other	Battery specific gravity, needs charging	below 1.215	specific gravity	at 80°F (26.7°C)
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

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	5W-30 or 10W-30	API Service Class SG, SH, or SJ synthetic		1.8 L	14 kW models; synthetic oil oxidizes and thickens less
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 LPG				Generator set is certified for emergency standby operation only
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
AC Sens Loss	AC Sensing Lost	In Auto mode, generator output AC sensing is lost. Detection begins 10 seconds after crank disconnect.	Warning	Contact authorized distributor/dealer for service
Accy PwrOver	Accessory Power Overload	An over current fault (short circuit) on the accessory controller power output	Warning	Contact authorized distributor/dealer for service
Advanced Diagnostic	Advanced Diagnostic Active	Shutdown during reduced-speed portion of exercise; engine restarts, runs at full speed for 2 minutes, then stops and returns to AUTO.	Shutdown	If generator set does not restart and return to AUTO, check for other faults.
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).
ATS ComError	ATS Communication Error	Warning is displayed if ATS interface connection is lost	Warning	Check communication wiring between transfer switch interface board and generator set
ATS PhaseRot	ATS Phase Rotation Mismatch	Transfer switch phase rotation does not match; ATS will not transfer	Warning	Correct the ATS connection per ATS Installation manual and labels
Aux Input	Auxiliary input	Optional customer-connected input is closed.	Shutdown	Check customer-supplied equipment.
Batt Chg Flt	Battery charger fault	Input to PIM from an external battery charger.	Warning	Check external battery charger.
Battery CrLo	Battery Crank Low	Engine starting battery voltage falls below 11 VDC for more than 10 seconds	Warning	Clears when battery voltage returns to acceptable level
Battery High	Battery voltage high	Engine starting battery voltage rises above 16 VDC for more than 10 seconds; inhibited during crank cycle.	Warning	Check battery rating and condition; check battery charger.
Battery Voltage Low	Battery voltage low	Engine starting battery voltage falls below 12.5 VDC for more than 90 seconds when engine is not running.	Warning	Check battery rating and condition; check battery charger; charge or replace battery.
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
Eng Speed High	Engine speed high	Engine speed exceeds 115% of normal running speed for more than 0.3 seconds.	Shutdown	Contact an authorized distributor/dealer for service.
Eng Speed Low	Engine speed low	Engine speed drops below 85% of normal running speed for more than 3 seconds.	Shutdown	Reduce load; check enclosure thermostat on 20RESC/20RESCL; contact distributor/dealer.
Exer Not Sch	Exercise not scheduled	No exercise is scheduled on the controller.	Warning	Set the exerciser.
Frequency High	Frequency high	Governed frequency exceeds 110% of system frequency setpoint for more than 10 seconds.	Shutdown	Contact an authorized distributor/dealer for service.
Frequency Low	Frequency low	Governed frequency falls below 90% of system frequency for more than 10 seconds or 1 Hz below for more than 60 seconds.	Shutdown	Reduce load and restart; check enclosure thermostat on 20RESC/20RESCL; contact distributor/dealer.
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 Crank Vlt	Low cranking voltage	Battery voltage falls below 8 VDC for more than 6 seconds while starter is engaged.	Warning	Charge or replace battery.
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
Locked Rotor	No engine rotation during cranking	No engine rotation is sensed during cranking; shuts down 3 seconds after fault detected.	Shutdown	Check battery and loose connections; contact distributor/dealer.
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.
Low Coolant Level	Low coolant level	Battery voltage supply issue; may also be triggered by low battery voltage on air-cooled models.	Warning	Verify utility power to TB1; check battery connections and condition.
MainPwrOverL	Main power overload	Over current fault on controller power output (short circuit).	Shutdown	Contact an authorized distributor/dealer for service.
NoEC	No engine configuration setting	Controller configuration is not set.	Warning	Set engine configuration (Ec) to match generator set engine type.
Not in Auto	Not in Automatic mode	Generator set is not in Automatic standby mode; remote start/stop commands ignored.	Warning	Press AUTO to place generator set in Automatic mode when appropriate.
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.
Oil Press Low	Low oil pressure	LOP switch indicates low oil pressure for more than 5 seconds; active 30 seconds after crank disconnect.	Shutdown	Check for leaks; check oil level and add oil; check oil pressure switch and wiring.
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.
Over Crank	Overcrank	Three unsuccessful starting attempts.	Shutdown	Check fuel supply, spark plug, and battery; check loose connections; contact distributor/dealer.
SCF0	Software Communication Fault 0	Indicates a software or communication problem within the controller.	Shutdown	Replace the controller.
Spd Sens Flt	Speed sensor fault	Engine speed sensor has failed or engine stalled.	Shutdown	Contact an authorized distributor/dealer for service.
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.
Uu----	Voltage and frequency not set	Controller displays Uu---- if voltage and frequency are not set to a standard combination.	Warning	Set system voltage and frequency parameter (Uu) to a standard combination.
Volts L1-L2 High	Generator voltage high	Output voltage exceeds 120% of system nominal voltage for more than 2 seconds.	Shutdown	Contact an authorized distributor/dealer for service.
Volts L1-L2 Low	Generator voltage low	Output voltage falls below 80% of nominal system voltage for more than 10 seconds.	Shutdown	Reduce load and restart; check enclosure thermostat on 20RESC/20RESCL; contact distributor/dealer.

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.

Frequency Adjustment, RDC Controller adjustment

⚠ Hazardous voltage.

⚠ Moving parts.

Tools: frequency meter

Attach frequency meter to AC output leads or load-side outlet.
Start and run generator at least 10 minutes to normal operating temperature.
Adjust engine governor speed (parameter 4P) to 60 Hz or 50 Hz as appropriate.
With no load, adjust governor gain (parameter 5P) until stable with no hunting or surging.
Check frequency; repeat steps 3 and 4 if necessary.
Save settings.

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 Conversion, 14RES/RESL (NG to LP) adjustment

⚠ Explosive fuel vapors.

⚠ Accidental starting.

Tools: dry cloth or brush, pipe sealant, gas leak detector

Press OFF and remove F3 fuse; disconnect battery charger.
Disconnect starting battery, negative lead first; turn off fuel supply.
Remove hose clamp and fuel hose from fuel block fitting.
Remove hose fitting from natural gas outlet port.
Remove plug from LP port.
Clean plug, apply fresh pipe sealant, install in natural gas port.
Clean hose fitting, apply fresh pipe sealant, install in LP port.
Slide hose onto fitting and secure with clamp.
Disconnect DSAI leads for LP near fuel solenoid valve.
Connect and turn on new fuel supply.
Reconnect battery, negative lead last; reconnect battery charger.
Install F3 fuse and start generator set with RUN button.
Check for leaks using a gas leak detector.
Run generator set and check operation; adjust output and stability if necessary.
Press OFF to shut down generator set.

Fuel Conversion, 20RES/RESL (NG to LP) adjustment

⚠ Explosive fuel vapors.

⚠ Accidental starting.

Tools: gas leak detector

Press OFF and remove F3 fuse; disconnect battery charger.
Disconnect starting battery, negative lead first; turn off fuel supply.
Remove hose clamp and fuel hose from hose fitting.
Insert LP orifice into hose fitting.
Slide hose onto fitting and secure with clamp.
Disconnect DSAI leads 65 and N5 for LP.
Connect and turn on new fuel supply.
Reconnect battery, negative lead last; reconnect battery charger.
Reinstall F3 fuse and start generator set with RUN button.
Check for leaks using a gas leak detector.
Run generator set and check operation; adjust output and stability if necessary.
Press OFF to shut down generator set.

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.

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
		Model RDT/RSB transfer switch or remote start/stop	terminals 3 and 4	Route engine start leads through separate conduit from AC power and load leads.
		Model RRT transfer switch interface	ATS1--ATS4	Connect interface panel to ATS1--ATS4 before connecting engine starting battery.
		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.
		Utility power	Utility terminals	Connect to GFCI-protected circuit supplied by utility and backed up by generator.
	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	1	Single
100/200	3	Delta
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

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

Parts cataloged across the Kohler CH740 family

300

Part #	Description	Category
140-1787	Hood, Air Cleaner	Air filter
140-1841	Cleaner. Air (Includes Element)	Air filter
140-2174	Cleaner, Air - Oil Bath Band. Mount ing	Air filter
185-2199	Band, Mounting - Air Cleaner	Air filter
24 083 02	Precleaner element	Air filter
24 083 02-S	Precleaner	Air filter
24 083 05-S	Precleaner	Air filter
24 083 08	Air cleaner element	Air filter
24 083 08-S	Element, air filter	Air filter
24 083 09-S	Element, air filter	Air filter
420A248	Air filter	Air filter
505-0180	Plug, Pipe (1-1/4"), Air Cleaner Adapter and Intake Manifold	Air filter
ADV-6823-A	Air Filter, Spark Plug Location	Air filter
RSP-FT-02-US-91	Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter.	Air filter
RSP-FT-04-US-91	Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter.	Air filter
185-2266	Alternator (12 VDC) (See Separate Page for Components)	Alternator
191-1368	Arm, Alternator Adjusting	Alternator
191-1872	Alternator (12 VDC) (Gl)	Alternator
191-1983-01	Alternator	Alternator
191-2085	Strap, Alternator Adjust	Alternator
269373	Alternator Assembly	Alternator
300-2880	Board, Voltage Regulator (VR21)	Avr
305-0491	REGULATOR. 305-0491	Avr
KO3226	Electric Starter Service Kit	Battery
130-2500	Guard, Belt (Left Side)	Belt
1512-0154	Belt Fan	Belt
501-0225	45' Lg - With Both Ends 1/8' NPT Male Fittings	Belt
511-0112	Belt, Fan	Belt
515-0094	Key, Crankshaft Woodruff Belt	Belt
718-1069	Fan Pldl@y Sell. Vee Smwv, Cap Hex Head (M8 X I 25 X 25]	Belt
332AI006	Block, Terminal	Block
332AI009	Block, Terminal	Block
358072	3/8"-16 UNC-2A THD Thrubolt	Bolt
322P69	Bracket, Mounting - Engine	Bracket
GM80980	Brush(es)	Brush
25 158 08-S	Bushing, linkage retaining	Bushing
GM29253-GA2	Controller Wiring Diagram	Controller wiring diagram
GM103743	Emergency Stop Switch (optional)	Emergency stop switch
154P570	Union, Manifold Flange	Exhaust
15SA47	Tube, Flexible Exhaust	Exhaust
505-382	Nipple, Exhaust(3"x 2-5/8")	Exhaust
24 050 01-S	Filter, breather	Filter
149-1445	Filter	Fuel filter
149-1920	Plate, Mounting - Fuel Filter Elbow, Hose - Male	Fuel filter
149-1921	Plate, Mounting - Fuel Filter Elbow, Hose - Male	Fuel filter
149-1922	Spacer, Mounting - Fuel Filter	Fuel filter
149-2100	Filter Assembly, Fuel Element. Filter	Fuel filter
149-2106	Element	Fuel filter
147-2715	Remote Fuel Pump Kit EFI (HGJAA)	Fuel pump
149K526	Repair Kit, Fuel Pump	Fuel pump
149K74	Repair Kit, Fuel Pump - Includes parts marked (* anda) - For AC mfr., BLAKING mfr. or ONAN mfr. pumps	Fuel pump
151-0437	Kit, Throttle Modification (Fuel Injection Pump)	Fuel pump
103-0731	Gasket, Gearcase	Gasket
103-0733	Gasket, Gearcase Backplate	Gasket
110-1718	Head, Cylinder Gasket, Cylinder Head	Gasket
110-2987	Gasket, Cylinder Head	Gasket
110-3225	Gasket, Cylinder Head	Gasket
141-0982	Gasket	Gasket
141-0983	Gasket, Carburetor	Gasket
149-1446	Gasket, Cover	Gasket
149A159	Gasket - Spacer - BLAKING mfr. pump only	Gasket
154-3085	Gasket, Intake Manifold	Gasket
155-2073	Gasket, Exhaust Pipe	Gasket
155-2619	Spec D, Exhaust Manifold) *Gasket. Elbow - Exhaust (WC 0)	Gasket
165-2203	Gasket, Manifold - Exhaust (&xx A-C)	Gasket
168-0174	Kit, Gasket - Valve Grind	Gasket
185-2175	Gasket	Gasket
185-2203	Gasket, Manifold - Exhaust (&xx A-C)	Gasket
185-2284	Gasket	Gasket
187-6224	Gasket, Rocker Cover	Gasket
187-6230	Gasket, Cylinder Head (1)	Gasket
187-6238	Gasket, Breather Plate	Gasket
GM20990	Gasket	Gasket
130-0755	8racket, Mounting Heater, Tank - 850 Watt, 115 Volt (Includes Hose Connector, Cord and Mounting Strap)	Hose
140-2234	Tube. Air Inlet	Hose
154-3067-02	Manifold Assy, Intake (Includes Hose Connector)	Hose
185-2239	Clamp, Hose	Hose
185-2240	Clamp, Hose	Hose
185-2300	Clamp, Hose	Hose
185-2421	Hose, Rubber - Overflow	Hose
501-0227	Line, Fuel - Flexible (24' La x 1/8' NPT Male x-1/8° NPT Male)	Hose
502-0068	Tee (3/8' x 5/8' x 5/8') to	Hose
502-0313	Elbow, Hose − 90° (1/8” Pipe to 1/4” Hose)	Hose
502-0433	[;b'$P&x 5/16 ID Hose]	Hose
502-0613	Connector, Hose	Hose
502-0869	Connector (3/8')	Hose
502-0870	Tee, Hose	Hose
502-1314	Connector, Hose	Hose
503-0183	Clamp, Hose	Hose
503-0365	Clamp, Hose	Hose
503-0594	Hose, Rubber - Preformed	Hose
503-059b	Hose, Rubber - Preformed	Hose
503-0685	Clamp, Hose	Hose
503-1058	Spacer, Fan Hose, Radiator - Upper	Hose
503-1062	Hose - Intake Manifold Water Pump (3/8' ID)	Hose
503-1074	Hose Reducer	Hose
503-1084	Elbow. Reducer	Hose
503-1250	Hose, Water Bypass (5/8' Ill)	Hose
503-1251	Hose, Water Bypass (5/8' 10]	Hose
503-1450	Hose, Cleaner - Air	Hose
503-1552-01	Ho!M? (5/8' ID X 14')	Hose
503-2126	Hose, Vacuum	Hose
503-365	Clamp, Hose	Hose
505-4	Hose (Order 6 “of Bulk Hose Number 503-324)	Hose
750-1004	Nut, Hex (M6 x 1) Washer, Lock - Spring (M6) Adapter, Hose Hose, Rubber - Preformed	Hose
X-386-109	Fuel line, flexible	Hose
X-386-112	Line, flex (50.0")	Hose
X-386-128	Line, flex (42.0")	Hose
147-0856	Injector, Fuel (Includes Parts Marked #)	Injector
147-0864	#O'Ring, Injector	Injector
147-0865	#O'Ring, Injector	Injector
25 435 06-S	Kit, starter solenoid	Kit
322-17	Bulb, (2) Panel ( I ) Pilot	Lamp
24 590 01-A	Oil Cooler, 14RCA/L	Oil cooler
24 590 27	Dipstick	Oil dipstick
24 590 29	Oil Fill	Oil fill
12 050 01	Oil Filter	Oil filter
12 050 01-S	Filter, oil	Oil filter
098-7130	Label, Warning Heat	Service part / kit
098-7369-01	HDCAC	Service part / kit
098-7374	Label, Warning	Service part / kit
098-7375	Label, Switch	Service part / kit
098-7376	Label, Circuit Breaker	Service part / kit
098-7398-01	HDCAA	Service part / kit
098-7398-02	HDCAB	Service part / kit
098-7399-01	45A, 2 Pole	Service part / kit
098-7399-02	50A, 2 Pole	Service part / kit
098-7461	Label, Warning Hazardous Voltage	Service part / kit
098-7462	Label, Service Information Label, Model Ident	Service part / kit
098-7463	Label, Fuel Attachment	Service part / kit
098-7464	Label, Coolant Drain	Service part / kit
098-7465-03	Label, Control Face	Service part / kit
098-7466	Label, Control Rear	Service part / kit
098-7497-01	Label, Warning Install	Service part / kit
098-7498-01	Label, Warning Hazardous	Service part / kit
098-7515-01	Label, Warning Voltage	Service part / kit
1-24-67	Crankshaft	Service part / kit
10-24-658	Air Intake	Service part / kit
101-0439	Plate, Rear Bearing Bearing, Crankshaft	Service part / kit
102-0778	Adapter, Pipe - Oil Drain	Service part / kit
104-0032	Gear, Crankshaft	Service part / kit
104-0091	Washer, Flat (Special)	Service part / kit
104-1953	Washer, Flat (1/2' ID x 2.25' OD)	Service part / kit
104-1958	Marked ) Spec A/B Begin Spec C Pulley Assy, Drive (Includes	Service part / kit
104-2000	Marked ) Spec A/B Begin Spec C Pulley Assy, Drive (Includes	Service part / kit
105-0058	Plunger, Camshaft	Service part / kit
105-0059	Spring, Plunger	Service part / kit
105-0508	Shaft, Idler Gear	Service part / kit
105-0513	Gear, Idler (Includes Finished 8earing)	Service part / kit
105-0519	8earing, Idler Gear (Semi Finished)	Service part / kit
105-0541	Washer, Thrust	Service part / kit
105-0641	Gear (Includes Spacer and Plate)	Service part / kit
105-0676	Camshaft	Service part / kit
10S-2283	Cap	Service part / kit
11-24-3	Exhaust	Service part / kit
110-0904	Rotocap, Exhaust	Service part / kit
110-1719	Valve, Exhaust	Service part / kit
110-2181-03	.50 MM Oversize	Service part / kit
110-2781-01	Standard	Service part / kit
110-2781-02	.25 MM Oversize	Service part / kit
110-3045	Standard	Service part / kit
110-3226-01	Standard	Service part / kit
110-3226-02	.25 MM Oversize	Service part / kit
110-3226-03	.50 MM Oversize	Service part / kit
110-3245	Cap, Valve Stem (Not used on some early models)	Service part / kit
110-3462	Valve, Exhaust Valve	Service part / kit
110-3462-01	Oversize	Service part / kit
110-3462-02	.005' Oversize	Service part / kit
110-3462-03	.010' Oversize	Service part / kit
110-3462-04	.025' Oversize Seat, Intake Valve	Service part / kit
110-3490	0.5 MM Oversize	Service part / kit
110-3655	.005' Oversize	Service part / kit
110-3655-05	Piston Ring Standard .005 Oversize	Service part / kit
110-3655-10	.010' Oversize	Service part / kit
112-0265	Piston (Includes Pin, Rings and Retaining Rings) Oversize Oversize Oversize Oversize	Service part / kit
112-0265-01	Standard Oversize	Service part / kit
112-0265-02	Standard Oversize	Service part / kit
112-0265-03	Standard Oversize	Service part / kit
112-0265-05	Standard Oversize	Service part / kit
112-0267	Standard Oversize	Service part / kit
112-0268	Pin, Piston Ring, Retaining	Service part / kit
113-0311	Standard Oversize Oversize	Service part / kit
113-0311-01	.010 Oversize	Service part / kit
113-0311-02	.020 Oversize	Service part / kit
113-0311-03	.030 Oversize	Service part / kit
113-0311-05	Standard	Service part / kit
114-0036	Bushing, Bearing, Connecting Rod	Service part / kit
114-0188	Standard	Service part / kit
114-0188-02	.002' Undersize .010' Undersize	Service part / kit
114-0188-10	.010' Undersize .020' Unders0size	Service part / kit
114-0188-20	.020' Undersize	Service part / kit
114-0203	Rod, Connecting (Includes Bolt and Bushing)	Service part / kit
115-0202	Ball, Rocker Arm	Service part / kit
115-0204	Short	Service part / kit
115-0253	Pushrod	Service part / kit
115-0270	Long	Service part / kit
115-0313	Guide, Pushrod	Service part / kit
115-0315	Locknut, Rocker Arm	Service part / kit
115-0316	Arm, Rocker	Service part / kit
12-24-1216	Engine Decals	Service part / kit
120-0920	Tube, Rocker Arm Oil	Service part / kit
120-1063	Washer, Flat	Service part / kit
123-1533	Indicator, Oil Level	Service part / kit
123-1534	Head Flange (M8 x 19MM) Tube, Oil Level	Service part / kit
123-1535	Screw, Self-Locking - Hex (#8-18 x 1/2')	Service part / kit
130-0810	Guard, Fan - Right Side	Service part / kit
130-0811	Gual'd, Fan - Left Side	Service part / kit
130-1805	Guard, '8elt Screw, Locking - Hex Washer Head (!5/16-18 x 1/2')	Service part / kit
130-2493	Guard, 8elt (Right Side)	Service part / kit
130-3024	Brace, Radiator	Service part / kit
130-3870	Guard, Scroy, Capt+ex Head (Mtox	Service part / kit
130A80	Screw, Hex Cap ( I /,$-20 x I “ )	Service part / kit
140-0722	Band, Mount ing	Service part / kit
140-1260	Fitting, Safety Filter	Service part / kit
140-1559	Hood	Service part / kit
146-0736	Body, Throttle	Service part / kit
146-0773	Insulator, Carburetor *Carburetor	Service part / kit
146-0774	Insulator, Carburetor *Carburetor	Service part / kit
146-0782	Body Assy, Throttle (See Separate Page for Components)	Service part / kit
147-0673	Clamps Six Lines Connector	Service part / kit
147-0855	Rail Assy, Fuel (Includes Parts Marked *)	Service part / kit
147-0866	Clamp, Fuel Rail	Service part / kit
147-0867	Regulator, Fuel Pressure	Service part / kit
147-0868	Ring, Pressure Regulator Snap	Service part / kit
149-1908-04	Plug. Pipe - Square Socket Drive Filter/Separator - Fuel (Pressure Type) (See	Service part / kit
149-1908-06	Filter/Separator - Fuel (Pressure Type) (Includes Electric Fuel Heater and Bowl Heater) (See Separate Page for Components)	Service part / kit
149-1932	Line, Fuel	Service part / kit
149-1944	Line. Fuel	Service part / kit
149-1945	Line, Fuel	Service part / kit
149-1952	Plug. Vent (Includes	Service part / kit
149-2101	Line, Fuel - Flexible	Service part / kit
149-2102	Line, Fuel - Flexible	Service part / kit
149-243	Retainer, Valve - AC Mir.	Service part / kit
149A539	Retainer, Valve Cage	Service part / kit
149A672	Spring, Diaphragm	Service part / kit
149A675	Spring, Rocker Arm	Service part / kit
150-0723	+Contact	Service part / kit
150-0939	Joint, Ball	Service part / kit
150-1923	Rod, Governor Control	Service part / kit
150-1996	Bracket, Mounting	Service part / kit
150-2009	Bracket, Support - Overspeed Contact (Nonmetallic)	Service part / kit
150-2011	Point, Contact - Electrical (1/4-20 X 3/8')	Service part / kit
150-2512	Bracket Screw, (Ma x 25mm)	Service part / kit
150-2685	Stator, Wound	Service part / kit
150-2745	Link, Throttle	Service part / kit
150-2748	Spring, Tension	Service part / kit
150-2771	Lever, Governor	Service part / kit
151-0565	Control Unit, Governor -12 VDC (A12)	Service part / kit
151-0566	Actuator, Governor	Service part / kit
151-0567	Arm, Governor (Includes Screw and Nut)	Service part / kit
151-0718	Rotor, Governor	Service part / kit
151-0723	Spring, Torsion	Service part / kit
154-2485	Adapter, Exhaust	Service part / kit
154-3067-01	Manifold, Intake	Service part / kit
155-0996	Elbow, Exhaust	Service part / kit
155-1310	8and, Mounting	Service part / kit
155-1425	Standard	Service part / kit
155-1430	Spacer	Service part / kit
155-1434	Shield, Heat	Service part / kit
155-1639	Stainless Steel	Service part / kit
155-1950	Tube, Exhaust - Stainless Steel	Service part / kit
155-2058	Muffler. Exhaust Muffler, Exhaust - Spark Arrestor	Service part / kit
155-2076	Pipe. Exhaust	Service part / kit
155-2083	Muffler. Exhaust Muffler, Exhaust - Spark Arrestor	Service part / kit
159-0020	Cap, Tank	Service part / kit
159-1128	Strap, Hold Down	Service part / kit
159-1129	Brace	Service part / kit
159-1234	Bolt, U	Service part / kit
166-0794	Bracket, Ignition Control	Service part / kit
166-0820	Coil, Ignition (T1)	Service part / kit
166-0821	Module, Ignition Control (S3)	Service part / kit
166-0842-01	Rotor, Ignition	Service part / kit
167-1615-01	Cable, Spark Plug 9'	Service part / kit
167-1615-05	23'	Service part / kit
18.5-2282	Cap Nut	Service part / kit
185-2083	Shaft Assembly, Fuel (Siy?e I Governor)	Service part / kit
185-2085	Plate, Screw. Cap Lockwasher	Service part / kit
185-2106	Scud (MB x 1125) Stud /MB x 1125)	Service part / kit
185-2158	Gear	Service part / kit
185-2161	CW	Service part / kit
185-2162	Retainer. Ball - Governor	Service part / kit
185-2163	Ring. Retaining Rina. Retainina	Service part / kit
185-2164	Race. Ball - Governor Race: Ball - G&ernor	Service part / kit
185-2165	Retaining Retaining	Service part / kit
185-2187	Key	Service part / kit
185-2193	Cap, Radiator	Service part / kit
185-2201	Cush ion	Service part / kit
185-2206	Cleaner Assembly, Air (See Separate Page for Components)	Service part / kit
185-2223	Shim (0.15nn)	Service part / kit
185-2252	Regulator, Voltage (12 VCC)	Service part / kit
185-2255	Radiator (Includes Cap)	Service part / kit
185-2264	Lever, Control - Speed	Service part / kit
185-2269	Bracket, Adjusting	Service part / kit
185-2310	Ring, Retaining	Service part / kit
185-2316	Bearing, Ball	Service part / kit
185-2354	Key	Service part / kit
185-2357	Ball Ring. Ball Ring.	Service part / kit
185-2358	Ball	Service part / kit
185-2360	Stud	Service part / kit
185-2367	Nut, Hex (MS x 1.25) fiex 8	Service part / kit

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the displacement of the Kohler Command PRO OHV CH740?

The Kohler Command PRO OHV CH740 has a displacement of 725.0 liters.

Which generators use the Kohler Command PRO OHV CH740 engine?

The Kohler Command PRO OHV CH740 powers 2 generator set(s), including Kohler 12RES, Kohler 14RES.

What is a common problem with the Kohler Command PRO OHV CH740 engine?

A commonly reported issue on generators using the Kohler Command PRO OHV CH740 is: Stops suddenly. Cause: Fault shutdown. Fix: Check for a fault shutdown code on the controller’s LED display. Correct the fault and then move the generator set master switch to OFF/RESET to reset the controller..