Name: Kohler 18RES Generator Set
Brand: Kohler

Service parts for the 18RES

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

Air intake

1 required

62 083 01-SAir filterfind

Oil system

1 required

52 050 02-SOil filter$22.70Amazon

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

Specifications

Fuel	natural gas or propane (LP) vapor
Frequency	60.0 Hz
Standby power	18 kW
Standby kVA	17
Emissions	EPA phase 2
Controller	ADC-RES, ADC-RES (Advanced Digital), DC-RET, DC-RET Digital
Oil capacity	2.8 L
Alternator	2F5 (2-pole, Class H insulation)
Voltage options	120/240 V
Phase	1
Rated current	75/70 A
Circuit breaker	80 A
Battery cranking	525 CCA
Battery voltage	12 V
Battery quantity	1
Dimensions (L×W×H)	47×28×32 mm
Dry weight	227 kg
Sound level	68.0 dBA @ 23 ft m

Engine

Kohler CH 980

Oil capacity	2.8 L
Displacement	0.999 L
Rated speed	3000 rpm

Maintenance & consumables

for the Kohler CH 980

Item	Spec	Capacity	Part #	Interval
Air filter	Element, air filter		62 083 01-S		buy
Oil filter	Filter, oil		52 050 02-S		Amazon $22.70 eBay
Oil		2.8 L	—	150 hr
Spark plug	0.76 mm (0.030 in.)		—	300 hr

Service intervals

Item	Action	Hours	Months	Notes
Oil level	Check	8 hr		8 hours or before use; 8.5/12 kW models
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		Yearly or 100 hours; 8.5/12 kW models; service more often in dusty/dirty conditions
Air cleaner and precleaner service	Replace	100 hr		12 kW models; Yearly or 100 hours; 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
Engine oil	Change	150 hr	12 mo	8.5/12RES: yearly or 100 hours
Oil cooler	Clean	100 hr		Yearly or 100 hours; 17/18 kW models
Oil cooler	Inspect	100 hr		Yearly or 100 hours (17/18 kW models)
Oil cooler (17/18RES)	Clean	100 hr	12 mo	Yearly or 100 hours; inspect and clean
Air cleaner service	Clean	150 hr		Yearly or hours shown; 17/18 kW models
Air cleaner service (17/18 kW)	Replace	150 hr		Yearly or 150/300 hours
Change oil	Change	150 hr		Yearly or 150 hours (17/18 kW models)
Engine oil (17/18RES)	Change	150 hr	12 mo	Yearly or 150 hours
Oil	Change	150 hr		Yearly or 150 hours; 17/18 kW models
Oil filter (17/18RES)	Replace	150 hr	12 mo	Yearly or 150 hours
Spark plugs	Clean	150 hr		Yearly or hours shown; 17/18 kW models
Spark plugs (17/18 kW)	Replace	150 hr		Yearly or 150/300 hours
Oil filter	Replace	200 hr	12 mo	Yearly or 200 hours; 8.5/12 kW models
Replace filter (oil filter)	Replace	200 hr		Yearly or 200 hours (8.5/12 kW models)
Air cleaner service	Change	300 hr		Yearly or hours shown; 17/18 kW models
Air cleaner service	Replace	300 hr		18 kW models; 150/300 hours
Spark plugs	Check	300 hr		Yearly or 300 hours; 8.5/12 kW models
Spark plugs	Replace	300 hr		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 hose	Check	500 hr	12 mo	Yearly or 500 hours; 8.5/12 kW models
Replace stepper motor coupling and bushing	Replace	500 hr		500 hours; authorized distributor/dealer only
Stepper motor coupling and bushing	Replace	500 hr		Authorized distributor/dealer only; 8.5/12 kW models
Wire-cable insulation condition	Inspect	500 hr	36 mo	3 years or 500 hours
Wire-cable insulation condition	Test	500 hr		3 Years or 500 hours; 8.5/12 kW models
Air ducts, louvers	Clean		12 mo	Yearly
Battery and rack	Clean		12 mo	Yearly; remove corrosion, clean and dry
Battery charger operation, charge rate	Check		1 mo	Monthly
Battery electrolyte level and specific gravity	Check		12 mo	Yearly; not necessary for maintenance-free batteries
Battery terminals	Clean		12 mo	Yearly; clean and tighten
Brushes and collector ring	Inspect		12 mo	Yearly; authorized distributor/dealer only
Control and power wiring connections	Other		12 mo	Yearly; tighten
Exhaust insulation, fire hazards	Inspect		12 mo	Yearly
Flexible fuel lines and connections	Inspect		3 mo	Quarterly; replace as necessary
Fuel piping	Inspect		12 mo	Yearly

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
Gap	Spark Plug Gap 12/17/18RES	0.76	mm (0.030 in.)
Gap	Spark Plug Gap 8.5kW	0.51	mm (0.020 in.)
Gap	Spark plug gap	0.51	mm
Gap	Spark plug gap	0.76	mm (0.030 in.)
Other	Battery minimum cold cranking amps	525	CCA	at 0F
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	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	Engine oil capacity	1.9	L (2.0 qt.)
Other	Engine oil capacity	2.8	L (3.0 qt.) approximately
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 system leak test pressure	6-8 ounces per square inch (10-14 inches water column)	oz/in²	LPG vapor or natural gas system
Other	Nominal fuel rating, LP vapor	2500	Btu/ft3
Other	Nominal fuel rating, natural gas	1000	Btu/ft3
Other	Overfrequency shutdown threshold	110	% of system frequency setpoint	more than 5 seconds, active 10s after start
Other	Total inlet air requirement (60 Hz)	28.0 (990)	m3/min. (cfm)	60 Hz
Other	Total inlet air requirement (60 Hz)	29.6 (1045)	m3/min. (cfm)	60 Hz
Other	Underfrequency shutdown threshold	54	Hz	more than 5 seconds (or below 56.5 Hz for more than 60 seconds)
Pressure	Fuel supply pressure, LP vapor	1.7--2.7 (7-11)	kPa (in. H2O)
Pressure	Fuel supply pressure, natural gas	1.3--2.7 (5-11)	kPa (in. H2O)
Pressure	Fuel supply pressure, natural gas	1.7--2.7 (7-11)	kPa (in. H2O)
Pressure	Gas fuel system leak test pressure	6--8	ounces per square inch (10--14 inches water column)	fuel system test pressurized; use soap and water solution without ammonia or chlorine
Pressure	Gas fuel system leak test pressure	6--8 (10--14)	ounces per square inch (inches water column)	fuel system test pressurized
Pressure	LP/natural gas fuel system leak test	6--8 ounces per square inch (10--14 inches water column)		soap and water solution test pressure
Pressure	Low oil pressure shutdown	24.1 ±13.8	kPa (3.5 psi ±1.5 psi)
Speed	Crank cycle	15	seconds crank and 15 seconds off, 3 attempts	starting
Speed	Crank cycle	15 seconds crank and 15 seconds off, 3 attempts	seconds
Speed	Cut-in frequency	47.5	Hz	50 Hz units
Speed	Cut-in frequency	57.5	Hz	60 Hz units
Speed	Overfrequency shutdown threshold	110% of system frequency setpoint for more than 5 seconds	%	active 10 seconds after engine start
Speed	Overspeed shutdown threshold	110	% of normal running speed	more than 0.3 seconds
Speed	Overspeed shutdown threshold	110% of normal running speed for more than 0.3 seconds	%
Speed	Rated engine speed	3000	rpm	50 Hz operation
Speed	Rated engine speed	3600	rpm	60 Hz operation
Speed	Underfrequency shutdown threshold	below 54 Hz for more than 5 seconds; below 56.5 Hz for more than 60 seconds	Hz	active 10 seconds after engine start
Temperature	Battery heater thermostat ON / OFF	16-18 °C (60-65 °F) on; 27 °C (80 °F) off	°C
Temperature	Carburetor heater thermostat OFF	16 ± 3	°C	60 ± 5 °F
Temperature	Carburetor heater thermostat ON	4 ± 3	°C	40 ± 5 °F
Temperature	Carburetor heater thermostat ON	4 ± 4	C (40 ± 7F)
Temperature	Exhaust gas temperature exiting the enclosure at rated load	216 (420)	C (F)	at rated kW
Temperature	Thermostat OFF	16 ± 3	°C	Thermostat OFF (60 ± 5°F)
Temperature	Thermostat ON	4 ± 4	°C	Thermostat ON (40 ± 7°F)
Torque	Spark Plug Torque	24.4-29.8	Nm (18-22 ft. lb.)
Torque	Spark plug	18-22	ft. lb.
Torque	Spark plug	24.4--29.8	Nm (18--22 ft. lb.)
Torque	Spark plug	24.4-29.8	Nm
Voltage	Battery charger charging voltages (red/green LED)	11.8-14.0 V (bulk 6 A); 14.0-14.5 V (absorption 1.5-5 A); 13.0-13.6 V (float 0.1-1.5 A)	VDC	6-amp RES charger
Voltage	Battery charger output	6	amps
Voltage	Battery charger output (RES, 6 Amp)	12	VDC @ 6 Amps	INPUT 115 VAC 50/60Hz @ 1.6A
Voltage	Battery charger output (TRES, 2.5 Amp)	13.2	VDC	verify with battery disconnected
Voltage	Battery charger output (green LED on, FLOAT/MAINTENANCE stage)	13.0--13.6	V	0.1--1.5 amps
Voltage	Battery charger output (red LED on, BULK stage)	11.8--14.0	V	6 amps; battery charger on
Voltage	Battery charger output (red and green LEDs on, ABSORPTION stage)	14.0--14.5	V	1.5--5.0 amps
Voltage	Battery charger output, 6-amp RES	12	VDC	@ 6 Amps; input 115 VAC 50/60Hz @ 1.6A; max battery 180 Amp Hr.

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	Synthetic	API Service Class SG or higher			Use synthetic oil, API Service Class SG or higher
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
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 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
Other	Bicarbonate of soda (baking soda) and water solution				Battery acid cleanup: 500 g (1 lb.) bicarbonate of soda to 4 L (1 gal.) water; also used to clean battery and cables
Other	Petroleum jelly, silicone grease, or other nonconductive grease				Coat battery terminals after reconnecting cables

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

Fault codes

Code	Name	Meaning	Severity	Action
AF	Auxiliary fault input shutdown	Shutdown initiated by pushing the emergency stop switch (TRES models only). Not used on RES models.	Shutdown	Check the position of the emergency stop button. (TRES models only)
CC	Crank cycle
HB	High battery voltage warning	Fault code is displayed if the engine starting battery voltage rises above 16 VDC for more than 30 seconds when the engine is running. Not operative during the engine crank cycle; does not inhibit engine starting. Clears when the battery voltage returns to an acceptable level.	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 temperature for more than 5 seconds. This function becomes active after the engine reaches the crank disconnect speed.	Shutdown	Check for blocked air inlets and exhaust outlets.
LB	Low battery voltage warning	Fault code is displayed if the engine starting battery voltage falls below 11 VDC for more than 30 seconds when the engine is not running. Not operative during the engine crank cycle; does not inhibit engine starting. Clears when the battery voltage returns to an acceptable level.	Warning	Check the battery rating and condition; check battery charger operation; charge or replace battery.
LCL	Low coolant level	FMI 1, SPN 0x006F
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	FMI 1, SPN 0x006F
LOP	Low oil pressure shutdown	Shutdown occurs if a low oil pressure condition exists for more than 5 seconds. This function becomes active 30 seconds after the engine has reached crank disconnect speed (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.
OC	Overcrank shutdown	Shutdown occurs after 3 unsuccessful starting attempts. The crank cycle is set for three starting attempts of 15 seconds cranking and 15 seconds rest. The generator set also shuts down on OC if no engine rotation is sensed during cranking; shuts down 3 seconds after the fault is detected (locked rotor).	Shutdown	Check the fuel supply, spark plug, and battery. Check for loose connections. Contact an authorized distributor/dealer if the problem continues.
OF	Overfrequency shutdown	Shutdown occurs when the governed frequency exceeds 110% of the system's frequency setpoint for more than 5 seconds. This function becomes active 10 seconds after engine start (10 second inhibit).	Shutdown	Contact an authorized distributor/dealer for service if the problem continues.
OS	Overspeed shutdown	Shutdown occurs if the engine speed exceeds 110% of the normal running speed for more than 0.3 seconds.	Shutdown	Contact an authorized distributor/dealer for service if the 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.
UF	Underfrequency shutdown	Shutdown occurs if the governed frequency falls below 54 Hz for more than 5 seconds. Shutdown also occurs if the governed frequency falls below 56.5 Hz for more than 60 seconds. This function becomes active 10 seconds after engine start (10 second inhibit).	Shutdown	Reduce the load and restart the generator set. Contact an authorized distributor/dealer if the problem continues.
UU	Undervoltage shutdown	Shutdown occurs if voltage falls below 80% of the nominal system voltage for more than 10 seconds.	Shutdown	Reduce the load and restart the generator set. Contact an authorized distributor/dealer if the problem continues.

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

Procedures

ADC-RES Controller Configuration (Cn setting) adjustment

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

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

Frequency Adjustment Procedure adjustment

Tools: frequency meter

Attach a frequency meter to the AC output leads or an outlet on the load side of the generator set.
Start and run the generator set, then adjust engine governor speed to set output frequency (3600 rpm for 60 Hz, 3000 rpm for 50 Hz).

Voltage Adjustment Procedure adjustment

Tools: digital multimeter

With the generator set off, connect a digital multimeter to the output leads or an outlet on the load side; set meter to AC voltage.
Start the generator set by moving the master switch to RUN.
Use the ADC controller to adjust the voltage (parameter 1P) until output voltage reaches the desired value.
Adjust the voltage stability (gain, parameter 2P) to minimize light flicker.
Readjust the voltage if necessary.
Set the multimeter to measure frequency.
Adjust engine speed to the cut-in frequency (57.5 Hz for 60 Hz units, 47.5 Hz for 50 Hz units) via engine governor speed (parameter 4P).
Adjust the volts/Hz (parameter 3P) until voltage begins to drop as load is applied at cut-in frequency.
Reset engine speed to operating frequency (50 or 60 Hz) via parameter 4P.
Readjust voltage stability (parameter 2P) if necessary.
Readjust voltage (parameter 1P) if necessary.
Save settings.
Stop the generator set.

Network Bridge Diagnostics diagnostic

Check the network LEDs on the RJ45 connector for Ethernet network communication.
Check the STAT LED; if not lit, check connections and the engine starting battery.
Check the TX and RX LEDs for CAN data transmission and reception.
If neither the TX nor the RX LED flashes, check bridge power, connections, and settings.
If only one of the TX or RX LEDs flashes, check the connected devices on the generator set (CAN) side.

Resetting Controller after a Fault Shutdown diagnostic

⚠ Always identify and correct the cause of a fault shutdown before resetting the controller.

Move the generator set master switch to OFF/RESET.
Disconnect the generator set from the load using the line circuit breaker or ATS.
Identify and correct the cause of the fault shutdown.
Start the generator set by moving the master switch to RUN; test operate to verify the cause is corrected.
Move the master switch to OFF/RESET.
Reconnect the generator set to the load using the line circuit breaker or ATS.
Move the master switch to AUTO for startup by remote transfer switch or remote start/stop switch.

15/30RES and 15/30RYG Bridge Installation (GM62630-KP2) installation

Remove the junction box panel to gain access to the inside of the junction box.
Drill two 4.8 mm (3/16 in.) mounting holes in the top of the junction box.
Install network bridge GM58703 inside the junction box using two screws M7985A-0410-20, washers M125A-04-80, and nuts M934-04-50.
Proceed to Section 6, Network Bridge Connection.

15/30RESA and 15/30REYG Bridge Installation (GM62630-KP4) installation

Remove the junction box panel to gain access to the inside of the junction box.
Drill two 4.8 mm (3/16 in.) mounting holes in the top of the junction box.
Install network bridge GM58703 inside the junction box using two screws M7985A-0410-20, washers M125A-04-80, and nuts M934-04-50.
Proceed to Section 6, Network Bridge Connection.

17/18RES Bridge Installation (GM62630-KP1) installation

Open the enclosure and remove the front panel to access the controller junction box. Cover internal components.
Drill a hole for the customer-supplied Ethernet cable at the location shown.
Drill a 38.1 mm (1.5 in.) hole in the bottom of the junction box. Insert bushing X-634-28.
Route connector P21 of Y-harness GM62626 through this opening.
Drill two 4.8 mm (3/16 in.) mounting holes in the front panel at the locations shown.
Use two screws M7985A-04010-20, washers X-6278-8, and nuts M934-04-50 to mount network bridge GM58703.
Proceed to Section 6, Network Bridge Connection.

8.5/12RES Bridge Installation (GM62630-KP3) installation

Remove existing junction box panel GM60625. Save the hardware and seal for reuse.
Mount network bridge GM58703 onto the new panel using two screws X-51-15, washers M125A-04-80, and nuts M934-04-50.
Install new J-box panel GM66795 as shown. Use the existing hardware and seal X-6422-31.
Affix decal GM54820 in the location shown.
Proceed to Section 6, Network Bridge Connection.

Assign Bridge IP Address installation

Tools: DeviceInstaller software

Launch DeviceInstaller from the Windows Start button.
In the DeviceInstaller menu, click View then Details.
Click the Search button on the toolbar.
Find the device whose hardware address matches the MAC address printed on the network bridge label.
Click the Assign IP button in the toolbar.
If no IP address is assigned, enter the bridge's hardware (MAC) address and click Next.
Select Assign a Specific IP Address and click Next.
Type the bridge IP address, subnet mask, and default gateway in dotted decimal notation. Click Next.
Click the Assign button to assign the IP settings.
Click the Finish button to close the Wizard.

Battery Installation Procedure installation

⚠ Sulfuric acid in batteries can cause severe injury or death.

⚠ Explosion can cause severe injury or death. Relays in the battery charger cause arcs or sparks.

⚠ The generator set will not start and circuit board damage may occur if the battery is connected in reverse.

Ensure that the starting battery is fully charged before placing the battery in service.
Clean the battery posts and/or adapters if necessary.
Install the battery post adapters, if needed.
Place the battery in the housing.
Verify that the controller master switch is in the OFF position.
Connect the positive (+) lead to the engine starting battery.
Connect the negative (--) lead to the engine starting battery.

Connection Procedure (AC field connections) installation

⚠ Hazardous voltage. Backfeed to the utility system can cause property damage, severe injury, or death. Install an automatic transfer switch.

Connect the leads from the transfer switch emergency source lugs to the L1 and L2 connections on the generator set terminal block.
Connect the neutral (L0) and ground (GRD) leads from the ATS and the main panel to the corresponding connection points on the terminal block.
Connect utility power to the terminal block for the 120 VAC receptacles for the battery charger and optional carburetor heater.

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	Connection	Leads	Notes
	DSAI (Digital Spark Advance) leads	65 and N5	Connect for natural gas; disconnect for LP
	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
	Remote start	Engine start leads from terminals 3 and 4	Route engine start leads through separate conduit from AC power and load leads
120 VAC	Utility Power terminals on field-connection terminal block		Utility power circuit must be backed up by 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.

Common questions

How many kW is the Kohler 18RES?

The Kohler 18RES is rated 18 kW standby (17.0 kVA).

Which engine powers the Kohler 18RES?

The Kohler 18RES is powered by the Kohler CH 980 engine.

What kind of fuel does the Kohler 18RES run on?

The Kohler 18RES runs on natural gas or propane (LP) vapor.

How much oil does the Kohler 18RES take?

The Kohler CH 980 engine in the Kohler 18RES has an oil capacity of 2.8 liters.

Which alternator is fitted to the Kohler 18RES?

The Kohler 18RES uses a 2F5 alternator. It has 2 poles. Insulation class H.

What oil filter fits the Kohler 18RES?

The Kohler 18RES uses oil filter part number 52 050 02-S.

What air filter does the Kohler 18RES use?

The Kohler 18RES uses air filter part number 62 083 01-S.

Troubleshooting

Fault codes

Code	Meaning
High engine temperature	Engine runtime, hours
Low battery voltage	Crank cycle status
Overcrank	Remote two-wire start/stop capability
Overfrequency	Digital voltage regulation: ±1.5% RMS no-load to full-load
Overspeed	Automatic start for programmed cranking cycle

Symptoms & remedies

Symptom	Cause	Remedy
Severe electrical equipment damage.	Welding the generator set.	Never weld components of the generator set without first disconnecting the battery, controller wiring harness, and engine electronic control module (ECM).

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Kohler 18RES troubleshooting guide (22 entries) →

Parts

Part #	Description	Qty	System
25 158 08-S	Bushing, linkage retaining	1	Bushing	buy
25 435 06-S	Kit, starter solenoid	1	Kit	buy
358358	Coupling, stepper motor	4	Coupling	Amazon eBay
52 050 02-S	Filter, oil	8	Oil filter	Amazon $22.70 eBay
52 099 08-S	Switch, oil pressure	1	Switch	buy
62 083 01-S	Element, air filter	1	Air filter	buy
62 132 04-S	Spark plug	2	Spark plug	buy
GM28823	Sensor, oil temperature	1	Sensor	Amazon eBay $50.00
RSP-FT-03-US-01	Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter.		Air filter	Amazon eBay
RSP-FT-05-US-01	Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter.		Air filter	Amazon eBay
223316	Fuse, 10 A, 250 V	1	Service part / kit	Amazon $171.06 eBay $31.37
292937	Fuse, 20 A, 250 V	1	Service part / kit	Amazon eBay $31.78
AGS-10	AGS 10 inline fuse, battery charger (located in the battery lead)	1	Service part / kit	eBay
GM58703	Assy, J1939/ModBus/Ethernet Converter (network bridge)	1	Service part / kit	eBay
GM62347	Kit, Resi Maint (17RES) (4/cs)		Service part / kit	eBay $99.60
X-634-28	Bushing	1	Service part / kit	eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Available documents

Spec sheet — 18 RESL Cut Sheet (Kohler)Spec sheet — 18RES (Kohler)Operator's manual (Kohler)Operator's manual — 12 RES Operation (Kohler)Operator's manual — tp6515 (Kohler)Operator's manual — tp6517 (Kohler)Reference (Kohler)Reference — tp6793 (Kohler)Parts manual (Kohler)Parts manual — tp6518 (Kohler)Service manual — TT-1482 (Kohler)Service manual — tp6516 (Kohler)Service manual — tp6792 (Kohler)Service manual — tt1482 (Kohler)Service manual — tt1486 (Kohler)