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Kohler CH 740 Engine

The Kohler CH 740 is a 0.72 L 2-cylinder air-cooled engine rated at 3000 rpm, producing up to 17.6 kW. It powers generator sets from Kohler and SDMO, including the 12RES, 12TRES, 14RCA and 14RES. It holds 2 L (0.5 gal) of oil.

Also known as: Kohler CH 740

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

0.725 L

Displacement

Cylinders

3000 rpm

Rated speed

17 kW

Gross power

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

Engine specifications

Oil capacity	2.0 L
Coolant capacity	0.0 L
Displacement	0.725 L
Cylinders	2
Aspiration	air-cooled
Rated speed	3000 rpm
Gross power	17 kW

Generator sets powered by this engine

Shared across brands: Kohler, SDMO

Kohler 12RES Kohler 12TRES Kohler 14RCA Kohler 14RES Kohler 14RESA-LPGKohler 24VDCKohler 36VDCKohler 48VDCKohler 6VSG Kohler CH740SDMO RES 12 TEC

How to read your Kohler engine serial & model number →

Common problems

Generator set stops suddenly
Cause: Low oil pressure shutdown
Fix: Check the oil level. Check for signs of oil leaks.
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.
Lacks power
Cause: Air intake restriction, inadequate cooling
Fix: Inspect air intakes and exhaust for obstructions. Check air cleaner.
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.
Cranks but does not start
Cause: No fuel
Fix: Open (turn on) manual fuel valve. Check fuel supply tank (LP).
Low output or excessive drop in voltage
Cause: Generator overloaded
Fix: Reduce load.
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.
The generator set does not crank
Cause: Fault shutdown
Fix: Check for a fault code on the controller display. See Section 2.7.
Starts hard
Cause: Low battery voltage
Fix: Check battery voltage and battery charger connections, power supply, and operation.
Operates erratically
Cause: Air cleaner clogged
Fix: Replace element.
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.
Generator set stops suddenly.
Cause: Low oil pressure shutdown
Fix: Check the oil level.
The generator set does not crank.
Cause: Fault shutdown
Fix: Check for a fault code on the controller display. See Section 2.6.
No AC output
Cause: AC circuit breaker in the OFF position
Fix: Place the circuit breaker in the ON position.
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.

Compiled from service & troubleshooting documentation across every generator set that uses the Kohler CH 740.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter	High-density paper element; do not wash or use pressurized air		—	300 hr
Fuel filter	fuel system		—
Oil filter			12 050 01-S	200 hr	Amazon eBay $19.06 KuduParts $32.00 FridayParts $33.98
Battery	Fully charged specific gravity 1.260 at 80°F (26.7°C); charge if below 1.215		—	200 hr
Belt	coupling		—
Coolant			—
Coolant filter			—	150 hr
Oil	10W-50 extended-life synthetic oil	2.7 L (qt.)	—	300 hr
Spark plug	Gap 0.76 mm (0.030 in.); torque 24.4-29.8 Nm (18-22 ft. lb.)		—	300 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

Item	Action	Hours	Months	Notes
Oil level	Check	8 hr		First service — or before use
Oil level (14 kW)	Check	8 hr		Every 8 hours of engine operation
Oil level (20 kW)	Check	8 hr		Every 8 hours of operation
Oil level, 14 kW models	Check	8 hr		Every 8 hours of engine operation
Oil level, 18/20 kW models	Check	8 hr		Every 8 hours of engine operation
Oil level, 20 kW models	Check	8 hr
Oil level (26 kW)	Check	24 hr		Every 24 hours of operation
Oil level, 26 kW models	Check	24 hr
Low-profile precleaner	Clean	25 hr	12 mo	Service/replace
Low-profile precleaner	Replace	25 hr	12 mo	Service/replace; or annually. Air Cleaner/Intake
Préfiltre profil bas	Replace	25 hr		Sur une base annuelle¹ ou toutes les 25 heures; entretenir/remplacer
Ailettes de refroidissement	Clean	100 hr		Sur une base annuelle¹ ou toutes les 100 heures; vérifier et nettoyer comme indiqué
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.
Change oil (14 kW models)	Change	100 hr	12 mo	Yearly or 100 hours
Change oil (14 kW)	Change	100 hr	12 mo	Yearly or 100 hours
Cooling shrouds	Clean	100 hr	12 mo	Remove cooling shrouds and clean cooling areas
Cooling shrouds and cooling areas	Clean	100 hr	12 mo	Remove cooling shrouds and clean cooling areas
Cooling shrouds/areas	Clean	100 hr	12 mo	Every 100 Hours or Annually; remove cooling shrouds and clean cooling areas
Crankcase oil	Change	100 hr	12 mo	Yearly or 100 Hrs.
Engine oil	Change	150 hr	12 mo	Lubrication; Yearly or 100 hours
Enveloppes du système de refroidissement et zones de refroidissement	Clean	100 hr		Sur une base annuelle¹ ou toutes les 100 heures; déposez les enveloppes
Huile	Change	100 hr		Sur une base annuelle¹ ou toutes les 100 heures
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
Oil cooler (20/26 kW)	Clean	100 hr	12 mo	Yearly or 100 hours; inspect and clean
Oil cooler fins	Check	100 hr	12 mo	Every 100 Hours or Annually (if equipped); clean as necessary
Oil cooler fins	Inspect	100 hr	12 mo	Check; clean as necessary (if equipped)
Replace filter (20/26 kW)	Replace	100 hr	12 mo	Yearly or 100 hours
low-profile air cleaner element	Replace	100 hr	12 mo	Or annually
Élément du filtre à air bas	Replace	100 hr		Sur une base annuelle¹ ou toutes les 100 heures
Air cleaner	Replace	150 hr		300 hours shown; service more frequently under dusty/dirty conditions
Air cleaner service	Clean	300 hr	12 mo	Yearly or hours shown; 17/18 kW models
Air cleaner service (17/18 kW)	Replace	150 hr		Yearly or 150/300 hours

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
Angle	Maximum Angle of Operation	25	°	@ full oil level
Clearance	Camshaft End Play (w/shim)	0.076/0.127	mm	0.0030/0.0050 in.
Clearance	Camshaft Running Clearance	0.025/0.063	mm	0.0010/0.0025 in.
Clearance	Camshaft bore I.D. (max wear limit)	20.038 mm (0.7889 in.)	mm	max wear limit
Clearance	Camshaft bore I.D. (new)	20.000/20.025 mm (0.7874/0.7884 in.)	mm	new
Clearance	Camshaft end play (w/shim)	0.076/0.127 mm (0.0030/0.0050 in.)	mm
Clearance	Camshaft running clearance	0.025/0.063 mm (0.0010/0.0025 in.)	mm
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	Connecting Rod-to-Crankpin Running Clearance	New: 0.030/0.055 mm (0.0012/0.0022 in.); Max Wear Limit: 0.070 mm (0.0028 in.)	mm (in.)
Clearance	Connecting Rod-to-Crankpin Running Clearance (Max. Wear Limit)	0.070	mm	0.0028 in.
Clearance	Connecting Rod-to-Crankpin Running Clearance (New)	0.030/0.055	mm	0.0012/0.0022 in.
Clearance	Connecting Rod-to-Crankpin Side Clearance	0.26/0.63	mm	0.0102/0.0248 in.
Clearance	Connecting rod-to-crankpin running clearance (max wear limit)	0.070 mm (0.0028 in.)	mm	max wear limit
Clearance	Connecting rod-to-crankpin running clearance (new)	0.030/0.055 mm (0.0012/0.0022 in.)	mm	new
Clearance	Connecting rod-to-crankpin running clearance, max wear limit	0.070	mm (0.0028 in.)	max wear limit
Clearance	Connecting rod-to-crankpin running clearance, new	0.030/0.055	mm (0.0012/0.0022 in.)	new
Clearance	Connecting rod-to-crankpin side clearance	0.26/0.63 mm (0.0102/0.0248 in.)	mm
Clearance	Crankshaft End Play (except CH25 below Serial No. 2403500008)	0.050/0.750	mm	0.0020/0.0295 in.
Clearance	Crankshaft End Play (free)	0.070/0.590	mm	0.0028/0.0230 in.
Clearance	Crankshaft End Play (w/thrust bearing components)	0.070/1.190	mm	0.0028/0.0468 in.
Clearance	Crankshaft end play (except CH25 engines below Serial No. 2403500008)	0.050/0.750 mm (0.0020/0.0295 in.)	mm
Clearance	Crankshaft end play (free)	0.070/0.590 mm (0.0028/0.0230 in.)	mm	free
Clearance	Crankshaft end play (thrust bearing models, for adjustment)	0.05/0.50 mm (0.0020/0.0197 in.)	mm
Clearance	Crankshaft end play (w/thrust bearing components)	0.070/0.270 mm (0.0028/0.0100 in.)	mm
Clearance	Cylinder Bore I.D.	New: 77.000/77.025 mm (3.0315/3.0325 in.); Max Wear Limit: 77.063 mm (3.0340 in.)	mm (in.)	77 mm bore
Clearance	Cylinder Bore I.D.	New: 80.000/80.025 mm (3.1496/3.1506 in.); Max Wear Limit: 80.065 mm (3.1522 in.)	mm (in.)	80 mm bore
Clearance	Cylinder Bore I.D.	New: 82.988/83.013 mm (3.2672/3.2682 in.); Max Wear Limit: 83.051 mm (3.2697 in.)	mm (in.)	83 mm bore
Clearance	Cylinder Head Max. Out-of-Flatness	0.076	mm	77 mm and 80 mm bores; 0.003 in.
Clearance	Cylinder Head Max. Out-of-Flatness	0.076 mm (0.003 in.) for 77 mm and 80 mm bores; 0.1 mm (0.004 in.) for 83 mm bore	mm (in.)
Clearance	Cylinder Head Max. Out-of-Flatness	0.1	mm	83 mm bore; 0.004 in.
Clearance	Cylinder bore I.D. (CH18/CH20/CH22/CH620-CH640, new)	77.000/77.025 mm (3.0315/3.0325 in.)	mm	new
Clearance	Cylinder bore I.D. (CH22/CH23/CH670-CH680, new)	80.000/80.025 mm (3.1496/3.1506 in.)	mm	new
Clearance	Cylinder bore I.D. (CH25/CH730/CH740/CH750, new)	82.988/83.013 mm (3.2672/3.2682 in.)	mm	new
Clearance	Cylinder head max out-of-flatness	0.076 mm (0.003 in.)	mm
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	Exhaust Valve Guide I.D. Max. Wear Limit	7.159	mm	0.2819 in.
Clearance	Exhaust Valve Minimum Lift	8.07	mm	0.3177 in.
Clearance	Exhaust Valve Stem-to-Valve Guide Running Clearance	0.050/0.088	mm	0.0020/0.0035 in.
Clearance	Exhaust valve guide I.D. (max wear limit)	7.159 mm (0.2819 in.)	mm	max wear limit
Clearance	Exhaust valve minimum lift	8.07 mm (0.3177 in.)	mm
Clearance	Exhaust valve stem-to-guide running clearance	0.050/0.088	mm (0.0020/0.0035 in.)
Clearance	Exhaust valve stem-to-valve guide running clearance	0.050/0.088 mm (0.0020/0.0035 in.)	mm
Clearance	Governor cross shaft-to-crankcase running clearance, 6 mm shaft	0.013/0.075	mm (0.0005/0.0030 in.)	6 mm shaft
Clearance	Governor cross shaft-to-crankcase running clearance, 8 mm shaft	0.025/0.126	mm (0.0009/0.0049 in.)	8 mm shaft
Clearance	Gravel base thickness (with weed barrier)	3	in
Clearance	Hydraulic Valve Lifter to Crankcase Running Clearance	0.0241/0.0501	mm	0.0009/0.0020 in.
Clearance	Hydraulic valve lifter to crankcase running clearance	0.0241/0.0501 mm (0.0009/0.0020 in.)	mm
Clearance	Intake Valve Guide I.D. Max. Wear Limit	7.134	mm	0.2809 in.
Clearance	Intake Valve Minimum Lift	8.07	mm	0.3177 in.
Clearance	Intake Valve Stem-to-Valve Guide Running Clearance	0.038/0.076	mm	0.0015/0.0030 in.
Clearance	Intake valve guide I.D. (max wear limit)	7.134 mm (0.2809 in.)	mm	max wear limit
Clearance	Intake valve guide I.D. (new)	7.038/7.058 mm (0.2771/0.2779 in.)	mm	new
Clearance	Intake valve minimum lift	8.07 mm (0.3177 in.)	mm
Clearance	Intake valve stem-to-guide running clearance	0.038/0.076	mm (0.0015/0.0030 in.)
Clearance	Intake valve stem-to-valve guide running clearance	0.038/0.076 mm (0.0015/0.0030 in.)	mm
Clearance	Minimum distance of plants, shrubs, or combustibles from air intake	18	in

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		API Service Class SG or higher			Use synthetic oil.
Engine oil	10W-30 synthetic	Service class SJ or higher			Add 5W-30 or 10W-30 synthetic oil when oil level is low
Engine oil	10W-50 extended-life synthetic			1.9 L (qt.)	Premium oil option, 26 kW models, requires fewer oil changes
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 oil		1.8 L	14 kW models; capacity 1.8 L (1.9 qt.)
Engine oil	5W-30 or 10W-30 API Service Class SG, SH, or SJ synthetic	API SG/SH/SJ		1.8 L (qt.)	14 kW models
Engine oil	5W-30 or 10W-30 synthetic	API Service Class SG, SH, or SJ		1.8 L	14 kW models
Engine oil	5W-30 synthetic	Service class SJ or higher			Refer to Oil Matrix chart for oil recommendation based on air temperature
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	API service class SJ or higher (including synthetic)	API SJ or higher		1.6 L	Kohler oils recommended for best performance; select viscosity based on air temperature at time of operation (capacity is refill)
Engine oil	API service class SJ or higher; viscosity per temperature chart	API SJ or higher		1.6 L	Recommended Kohler oils; other high-quality detergent oils including synthetic acceptable.
Engine oil	KOHLER PRO 10W-50	API SJ ou supérieure		1.0 L	Huile synthétique toutes saisons; intervalle de 300 heures avec filtre à huile KOHLER PRO longue durée.
Engine oil	Kohler oils; other high-quality detergent oils including synthetic	API service class SJ or higher		1.6 L	Select viscosity based on air temperature at time of operation: 5W-30, 10W-30, SAE 30
Engine oil	Recommended oil			1.9 L	With filter
Engine oil	SAE 15W40				Sold by SDMO in 0.5 L (RBH0,5) and 1 L (RBH1) bottles
Engine oil	SAE 30				Voir tableau de viscosité.
Engine oil	SAE 30 above 10°C (50°F); SAE 20 from -17.8°C (0°F) to 10°C (50°F); SAE 10 below -17.8°C (0°F)			0.47 L	Wet disc type clutch oil splash lubrication; use 0.47 L (1 pt.) of motor oil of proper viscosity.
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	Synthetic, API Service Class SG or higher	API SG or higher			Check oil level at or near, not over, full mark on dipstick before operation
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	Kohler PRO 10W-50 synthetic		-29°C to 49°C	1.9 L	Extends oil change intervals to 300 hours
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	87 (R+M)/2 octane or higher; RON 90 octane minimum				Clean, fresh, unleaded gasoline. Up to 10% ethyl alcohol/90% unleaded acceptable; MTBE up to 15% by volume approved. Do not add oil. Do not use gasoline older than 30 days. E15, E20 and E85 are NOT approved.
Fuel	Clean, fresh, unleaded gasoline	Octane rating 87 (R+M)/2 or higher; RON 90 octane minimum			Gasoline up to 10% ethyl alcohol, 90% unleaded acceptable; MTBE and unleaded gasoline blend (max 15% MTBE by volume) approved; E15, E20 and E85 NOT approved; do not use gasoline older than 30 days
Fuel	Essence sans plomb	Indice d'octane 87 (R+M)/2 ou plus; RON minimum 90			Jusqu'à 10% d'alcool éthylique; MTBE max 15% volume; E15/E20/E85 NON compatibles; essence de plus de 30 jours non recommandée.
Fuel	LP gas or natural gas				Minimum fuel supply pressure NG: 1.2-2.7 kPa (5-11 in. H2O); LP: 1.7-2.7 kPa (7-11 in. H2O)

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 Sens Loss	AC sensing lost in Auto mode; generator output AC sensing lost. Detection begins 10 seconds after crank disconnect. Warning after 1 sec if no output detected after crank disconnect; Shutdown after 3 sec if voltage was present and then lost.	Warning	Contact an authorized dealer for service.
AC Sens Loss Shutdown	Loss of AC sensing shutdown	Less than 5% of rated voltage measured on Phase A for 3 seconds in AUTO	Shutdown	Check loose wiring and connections; check all AC leads; troubleshoot alternator
AC Sens Loss Shutdwn	Loss of AC sensing shutdown	Controller shut down the generator because there was less than 5% of rated voltage measured on Phase A for 3 seconds, only in AUTO.	Shutdown	Check for loose wiring and connections. Check all AC leads. Troubleshoot alternator.
AC Sens Loss Warning	Loss of AC sensing warning	Controller measured less than 5% of rated voltage on Phase A for 1 second, 10 seconds after crank disconnect.	Warning	Check for loose wiring and connections. Check all AC leads. Troubleshoot alternator.
Accy PwrOver	Accessory Power Overload	An over current fault (short circuit) on the accessory controller power output	Warning	Contact authorized distributor/dealer for service
Accy PwrOver Warning	Accessory Power Overload Warning	An over current fault (short circuit) on the accessory controller power output.	Warning	Contact an authorized dealer for service.
AccyPwrOver Warning	Accessory Power Overload	Overcurrent fault (short circuit) on the accessory controller power output	Warning	Check wiring to RBUS accessories; troubleshoot RBUS accessories
Advanced Diagnostic	Advanced Diagnostic	Shutdown during the reduced speed portion of an exercise. Event history shows Advanced Diagnostic Active. Engine restarts, runs at full speed for 2 minutes, and stops. Controller returns to AUTO mode.	Shutdown	If the generator set does not restart and return to AUTO, check for other faults that prevent generator set operation.
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	ATS communication error. Warning displayed if ATS interface connection is lost.	Warning	Check communication wiring between transfer switch interface board and generator set.
ATS ComError Warning	ATS communication error	Controller lost communication with the RXT ATS	Warning	Check connection to ATS module
ATS PhaseRot	ATS Phase Rotation	ATS phase rotation mismatch. Transfer switch phase rotation does not match; ATS will not transfer.	Warning	Correct the ATS connection. Refer to the ATS Installation manual, wiring diagrams, and labels on the transfer switch.
Aux Input	Auxiliary Input	An optional customer-connected input is closed (digital input from optional PIM).	Shutdown	Check customer-supplied equipment.
Aux Input Shutdwn	Auxiliary input shutdown	Digital input for a custom shutdown (AuxiliaryInputShutdown - PIM) was activated (low).	Shutdown	Check customer equipment connected to the PIM module.
Batt Chg Flt	Battery Charger Fault	Input to PIM from an external battery charger (not the built-in 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 CrLo Warning	Low Cranking Battery Voltage Warning	Engine starting battery voltage falls below 11 VDC for more than 10 seconds. Inhibited during crank cycle. Clears when battery voltage returns to acceptable level.	Warning	Check the battery rating and condition. Check the battery charger operation. Charge or replace the battery.
Battery CRLow Warning	Battery cranking low warning	Battery voltage dropped to 11 VDC or less for 30 seconds or more.	Warning	Check engine starting battery. Check battery charger DC output voltage from RDC2.
Battery High	Battery High	Engine starting battery voltage rises above 16 VDC for more than 10 seconds (inhibited during crank)	Warning	Check battery rating/condition and charger operation
Battery High Warning	Battery high warning	Battery voltage above the high warning setting for 10 seconds or more.	Warning	Check engine starting battery.
Battery Low Warning	Battery low warning	Battery voltage below the low warning setting for 90 seconds or more.	Warning	Check engine starting battery. Check battery charger DC output voltage from RDC2.
Battery Voltage High	Battery Voltage High	Engine starting battery voltage rises above 16 VDC for more than 10 seconds. Inhibited during crank cycle. Clears when voltage returns to acceptable level.	Warning	Check the battery rating and condition. Check the battery charger operation.
Battery Voltage Low	Battery Voltage Low	Engine starting battery voltage falls below 12.5 VDC for more than 90 seconds when engine not running. Not operative during crank cycle. Clears when voltage returns to acceptable level.	Warning	Check the battery rating and condition. Check the battery charger operation. Charge or replace the battery.
CC	Crank cycle
Chk DateTime Warning	Check Date and Time Warning	DC power to controller interrupted and date/time may not be correct	Warning	Verify time and date settings
CO-3		Fault displayed if the CO parameter is set incorrectly	Shutdown
CO-6		Fault displayed if the CO parameter is set incorrectly	Shutdown
Current A High Warning	Over Current	Paralleling protective relay warning; over current while paralleled.	Warning	Press AUTO or OFF. Pressing OFF will stop the generator set.
Default Pars Warning	Default Parameters Warning	Controller has been loaded with default parameters	Warning	Configure settings as required for desired operation
Emerg Stop Shutdwn	Emergency stop shutdown	Optional emergency stop button pressed or emergency stop leads ESS and/or ESN are not connected.	Shutdown	Reset the emergency stop button and clear the fault; check ESS and ESN connections; if no E-stop, connect ESS and ESN together.
Eng Speed High	Eng 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	Eng Speed Low	Engine speed drops below 85% of normal running speed for more than 3 seconds	Shutdown	Reduce the load; on 20RCA/RCAL check enclosure thermostat; contact dealer if it persists
Engine M/N Invalid Shutdwn	Engine model number invalid shutdown	Generator model number has not been entered.	Shutdown	Enter the generator set model number from the RDC2 keypad, or use SiteTech to select the genset model number.
Engine Speed High	Engine Speed High	Engine speed exceeds 115% of the normal running speed for more than 0.3 seconds.	Shutdown	Contact an authorized dealer for service.
Engine Speed High Shutdwn	Engine speed high shutdown	Engine speed, calculated from AC frequency, was above the high speed setting for 0.3 seconds or more.	Shutdown	Troubleshoot engine operation per the engine service manual.
Engine Speed Low	Engine Speed Low	Engine speed drops below 85% of the normal running speed for more than 3 seconds.	Shutdown	Reduce the load. Check enclosure thermostat and reset if tripped. Contact an authorized dealer for service.
Engine Speed Low Shutdwn	Engine speed low shutdown	Engine speed below the low speed setting for 3 seconds or more after crank disconnect; enclosure thermostat may have tripped.	Shutdown	Troubleshoot engine per engine service manual. Check for high enclosure temperatures and reset the thermostat.
Exer Not Sch	Exercise Not Scheduled	No exercise is scheduled on the controller.	Warning	See the Setting the Exerciser section for instructions to set the exerciser.
Frequency High	Frequency High	Governed frequency exceeds 110% of the system's frequency setpoint for more than 10 seconds. Active 10 seconds after engine start.	Shutdown	Contact an authorized dealer for service.
Frequency High Shutdwn	Frequency high shutdown	Frequency measured on Phase A exceeded the high frequency setting for 10 seconds, 10 seconds or more after crank disconnect.	Shutdown	Troubleshoot engine operation per the engine service manual.
Frequency High Warning	Over Frequency	Paralleling protective relay warning; over frequency while paralleled.	Warning	Press AUTO or OFF. Pressing OFF will stop the generator set.
Frequency Low	Frequency Low	Governed frequency falls below 90% of the system frequency setting for more than 10 seconds, or 1 Hz below setting for more than 60 seconds. Active 10 seconds after engine start.	Shutdown	Reduce the load and restart the generator set. Check enclosure thermostat and reset if tripped. Contact an authorized dealer for service.
Frequency Low Shutdwn	Frequency low shutdown	Frequency on Phase A was less than the low limit for 10 seconds, or 10 Hz or more less than rated for 60 seconds or more.	Shutdown	Troubleshoot engine per engine service manual. Check for high enclosure temperatures and reset the thermostat.
Frequency Low Warning	Under Frequency	Paralleling protective relay warning; under frequency while paralleled.	Warning	Press AUTO or OFF. Pressing OFF will stop the generator set.
Fuel Leak Shutdwn	Fuel Leak Shutdown	Digital input for Fuel Tank Leak Shutdown (PIM) activated (low)	Shutdown	Check customer equipment connected to the PIM module
Fuel Level Low Shutdwn	Fuel Level Low Shutdown	Digital input for Low Fuel Level Shutdown (PIM) activated (low)	Shutdown	Check customer equipment connected to the PIM module
GenBrkerOpen Warning	Generator Circuit Breaker Open	Voltage at generator set but none measured on emergency side of ATS (RXT required)	Warning	Check line circuit breaker; correct short circuits or overloading before resetting
Ground Fault Warning	Ground Fault Warning	Digital input for Ground Fault Warning (PIM) active (low)	Warning	Check customer equipment connected to the PIM module
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.
High Lube Oil Temperature Shutdown	High lube oil temperature shutdown	Oil temperature higher than 325 F (163 C).	Shutdown	See Overheats in the troubleshooting charts in Section 5.14.
High Lube Oil Temperature Warning	High lube oil temperature warning	Oil temperature higher than 300 F (149 C).	Warning	See Overheats in the troubleshooting charts in Section 5.14.
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 dropped below 3.5 VDC during engine cranking.	Warning	Charge or replace the battery.
Lo Crank Vlt Warning	Low cranking voltage warning	During cranking, battery voltage measured less than 60% (7.2V or 14.4V) for 6 seconds or more.	Warning	Check cranking 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	Locked Rotor	No engine rotation is sensed during cranking. Shuts down 3 seconds after fault is detected.	Shutdown	Check the battery. Check for loose connections. Contact an authorized dealer for service.
Locked Rotor Shutdwn	Locked rotor shutdown	No rotation of the engine or alternator was detected for 3 seconds or more during cranking.	Shutdown	Check cranking circuit. Troubleshoot the engine and alternator. Check alternator connections to controller and auxiliary winding circuit breaker.
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.
Low Oil Level or Oil Pressure	Low Oil Level or Oil Pressure	Oil level switch on the 26 kW indicates low oil level. LOP switch indicates low oil pressure for more than 5 seconds. Active 30 seconds after crank disconnect. Does not protect against low oil level.	Shutdown	Check for leaks in the lubrication system. Check the oil level and add oil if low. Check the oil level or oil pressure switch and wiring. If fault persists, do not run the generator set; contact an authorized dealer.
MainPwrOverL	Main Power Overload	Main power overload; an over current fault on the controller output (short circuit).	Shutdown	Contact an authorized dealer for service.
MainPwrOverL Shutdwn	Main power overload shutdown	Internal current limit circuit tripped, indicating an overcurrent condition on the DC power supply circuit.	Shutdown	Check crank, run, and flash relay circuits for short circuits.
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 Auto	The generator set is not in Automatic (standby) mode. Remote start and stop commands from a transfer switch or remote switch will be ignored.	Warning	Press AUTO to place the generator set in Automatic mode, when appropriate.
Not In Auto Warning	Not in auto warning	The RDC2 controller is not in AUTO; generator will not start from an ATS or remote device.	Warning	Press the Auto button to ensure automatic system operation.
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	Oil Pressure Low	The LOP switch indicates low oil pressure for more than 5 seconds. Function becomes active 30 seconds after crank disconnect (30 second inhibit). The low oil pressure shutdown 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. Check the oil pressure switch and wiring. If the fault persists, do not run the generator set. Contact an authorized dealer for service.
Oil Pressure Low Shutdwn	Low oil pressure shutdown	The low oil pressure switch was closed for 5 seconds or more; inhibited until 30 seconds after crank disconnect.	Shutdown	Check for oil leaks; check oil level and add oil if low; check oil pressure sensor.
Oil Pressure OpenCR Warning	Oil pressure open circuit warning	Oil pressure switch closure has not been detected after shutdown.	Warning	Check the oil pressure switch connection. Test the LOP switch.
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	Over Crank	Three unsuccessful starting attempts.	Shutdown	Check the fuel supply, spark plug, and battery. Check for loose connections. Contact an authorized dealer for service.
Over Crank Shutdwn	Overcrank shutdown	The engine did not start during the crank cycle (15 second time delay).	Shutdown	Check the alternator, fuel supply, cranking circuit, cranking battery; troubleshoot engine.
RBUS ComError Warning	RBUS communication error warning	The controller has lost communication with an RBUS device that had previously been communicating properly.	Warning	Check connection to the RBUS device.
Reactive Power Low Warning	Loss of Field	Paralleling protective relay warning; loss of field while paralleled.	Warning	Press AUTO or OFF. Pressing OFF will stop the generator set.
Real Power High Warning	Over Power	Paralleling protective relay warning; over power while paralleled.	Warning	Press AUTO or OFF. Pressing OFF will stop the generator set.

Showing the first 80 of 93 codes.

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.

Adjust Governed Idle Speed adjustment

Tools: Tachometer

Hold governor lever away from carburetor so throttle lever is against idle speed screw.
Start engine and warm up; adjust screw to approximately 1200 RPM.
Release governor lever and check throttle lever is in idle position.
Turn governed idle adjustment screw to obtain equipment manufacturer recommended idle speed (1500-1800 RPM).
Move throttle lever to wide-open/full throttle and set high speed screw to intended no-load RPM.

Adjust Low Idle Fuel adjustment

⚠ Do not attempt to remove limiter caps.

Place throttle control into idle or slow position; adjust low idle speed to 1200 RPM.
Turn low idle fuel adjusting needle out (counterclockwise) until engine speed decreases (rich); note position.
Turn needle in (clockwise); note position where speed decreases (lean).
Set adjusting needle midway between rich and lean settings.
Repeat for other low idle adjustment needle on two-barrel carburetor.
Recheck/adjust low idle speed to specified setting.

Adjust Low Idle Speed (RPM) adjustment

Tools: Tachometer

Place throttle control into idle or slow position.
Turn low idle speed adjusting screw in or out to obtain 1200 RPM (± 75 RPM).
Check speed using a tachometer.

Carburetor Low Idle Fuel Adjustment adjustment

⚠ Do not attempt to remove limiter caps.

Tools: tachometer

Place throttle control into idle or slow position; adjust low idle speed to 1200 RPM.
Turn low idle fuel adjusting needle out (counterclockwise) until engine speed decreases (rich); note position.
Turn needle in (clockwise) until engine speed decreases (lean); note position.
Set adjusting needle midway between rich and lean settings.
Repeat for other low idle adjustment needle on two-barrel carburetor.
Recheck/adjust low idle speed to specified setting.

Clutch Adjustment (wet disc type) adjustment

⚠ Do not attempt to pry or force spring lock away from ring.

Tools: large screwdriver

Release clutch and remove nameplate. Using a large screwdriver, turn adjusting ring clockwise, one notch at a time, until firm pressure is required to engage clutch.
After adjustment, engage clutch and check that rollers go over center to lock unit in engaged position and prevent releasing under load.
If trouble persists after readjustment, clutch reconditioning is indicated.

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.

Determining Camshaft End Play adjustment

Tools: camshaft end play checking tool, feeler gauge

Install shim removed during disassembly onto camshaft.
Position camshaft end play checking tool on camshaft.
Apply pressure on checking tool (pushing camshaft toward crankshaft). Use a feeler gauge to measure camshaft end play between shim spacer and checking tool. End play should be 0.076/0.127 mm (0.003/0.
If end play is not within range, remove checking tool and replace shim as necessary.
Reinstall end play checking tool and recheck end play.

Digital Linear Actuator (DLA) Adjustment adjustment

Tools: Torque wrench

DLA must be in fully retracted position during assembly.
Loosen DLA mounting plate screws located on top of actuator plate.
With throttle linkage centered in U-Clip or secured with retaining clip at end of DLA shaft, slide DLA bracket assembly back until throttle plate is fully open.
Torque mounting plate screws to 2.5 N·m (22 in. lb.).

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.

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
		12-volt engine electrical system, single starter motor, negative ground	Battery negative to ground terminal on or near starter motor; battery positive to positive terminal on starter solenoid	All generator set models use a negative ground with a 12-volt engine electrical system
		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 connection for non-RXT transfer switch or remote start/stop switch	Terminals 3 and 4 on generator set terminal block	Route engine start leads through separate conduit from AC power and load leads
		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
		RXT transfer switch to generator set terminal block A, B, PWR, COM	P10-1 through P10-4 (transfer switch) to A, B, PWR, COM (generator set)	Terminal block connections 3 and 4 not used with Model RXT ATS
		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.
	1	Single-phase leads 1-2, 3-4	1, 2, 3, 4	4-lead generator sets are not reconnectable
	3	Three-phase leads 1-4, 2-5, 3-6, 7-10, 8-11, 9-12	1-12	12-lead generator sets are reconnectable to voltages shown on the generator set specification sheet
	Single Phase	12-volt engine electrical system, single starter motor	Positive to starter solenoid; negative to ground on or near starter motor	Negative ground; follow polarity markings
	Single Phase	4-lead/12-lead reconnection per 12-Lead Generator Reconnection diagram (Figure 27)	Single-phase leads 1-2, 3-4; sensing leads 11-44	4-lead generators are not reconnectable; 12-lead three-phase reconnectable to voltages shown on spec sheet
	Three Phase	12-lead reconnection per Figure 27	Leads 1-4, 2-5, 3-6, 7-10, 8-11, 9-12; sensing leads V7, V8, V9	Also route leads through current transformers (CTs) and change controller voltage setting; replace line circuit breaker for new voltage
	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

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.

Aftermarket parts that fit this engine

1205001 Amazon eBay $19.06 KuduParts $11.00 FridayParts $33.98 1205001-S Amazon eBay $19.06 KuduParts $32.00 FridayParts $33.98 2404167-S KuduParts $9.00 FridayParts $9.56 MIU12491 KuduParts $9.00 FridayParts $9.56 24-393-02 FridayParts $29.99 24-393-04 FridayParts $29.99 24-393-16 FridayParts $29.99 24-393-16-S KuduParts $12.00 FridayParts $13.99 2439304S KuduParts $12.00 FridayParts $13.99 2455912-s FridayParts $34.80 24-584-15-S FridayParts $20.49 24-584-36-S FridayParts $20.49 24-755-141-S KuduParts $16.00 FridayParts $18.90 28-085-02-S FridayParts $45.99 CH1000 Amazon eBay $59.95 FridayParts $12.25 AM33845 FridayParts $48.10 AM37200 FridayParts $48.10 SO131 KuduParts $32.00 KH1205001S KuduParts $32.00 FP-XP-0042885 FP-XP-0033122 SV720 FridayParts $18.99 SV725 FridayParts $29.99 SV591 FridayParts $11.48 SV600 FridayParts $11.48 SV601 FridayParts $11.48 SV610 FridayParts $11.48 SV620 FridayParts $11.48 FP-XP-0010006

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Common questions

What is the oil capacity of the Kohler CH 740?

The Kohler CH 740 engine has an oil capacity of 2.0 liters.

What is the displacement of the Kohler CH 740?

The Kohler CH 740 has a displacement of 0.725 liters with 2 cylinders.

Which generators use the Kohler CH 740 engine?

The Kohler CH 740 powers 11 generator set(s), including Kohler 12RES, Kohler 12TRES, Kohler 14RCA, Kohler 14RES, Kohler 14RESA-LPG.

How often should you change the oil in the Kohler CH 740?

The Kohler CH 740 oil change interval is every 300 hours.

What is a common problem with the Kohler CH 740 engine?

A commonly reported issue on generators using the Kohler CH 740 is: Generator set stops suddenly. Cause: Low oil pressure shutdown. Fix: Check the oil level. Check for signs of oil leaks..