Service parts for the 12TRES
Grouped by system, with how many of each the parts manual calls for.
Oil system
1 requiredPrices 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 | 50.0 Hz |
| Standby power | 12 kW |
| Controller | ADC-RES, ADC-RES (Advanced Digital) |
| Oil capacity | 1.9 L |
| Voltage options | 230/400 V, 50 V |
| Phase | 3 |
| Circuit breaker | 20 A |
| Battery cranking | 500 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
Engine
| Oil capacity | 2.0 L |
|---|---|
| Coolant capacity | 0.0 L |
| Displacement | 0.725 L |
| Aspiration | air-cooled |
| Rated speed | 3000 rpm |
Maintenance & consumables
for the Kohler CH 740| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | 300 hr | |||
| Fuel filter | fuel system | — | 52 hr | ||
| Oil filter | 12 050 01-S | 200 hr | Amazon $30.38 eBay KuduParts $32.00 | ||
| Battery | battery | — | 30 hr | ||
| Belt | coupling | — | 12 hr | ||
| Coolant | — | 52 hr | |||
| Coolant filter | — | 150 hr | |||
| Oil | 2.7 L | — | 300 hr | ||
| Spark plug | 0.76 mm (0.030 in.) gap | — | 500 hr |
Service intervals
40| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Oil level | Check | 8 hr | Check at 8 hr. or before use | |
| 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 (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. |
| Engine oil | Change | 100 hr | 12 mo | 8.5/12RES: yearly or 100 hours |
| Oil cooler | Clean | 100 hr | 12 mo | Yearly or 100 hours; 17/18 kW models |
| Oil cooler | Inspect | 100 hr | Yearly or 100 hours (17/18 kW models) | |
| Oil cooler (17/18RES) | Clean | 100 hr | 12 mo | Yearly or 100 hours; inspect and clean |
| Air cleaner service | Clean | 150 hr | Yearly or hours shown; 17/18 kW models | |
| Air cleaner service (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) | |
| Replace filter(s) | Replace | 200 hr | 12 mo | Yearly or 200 hr. |
| Air cleaner service | Change | 300 hr | Yearly or hours shown; 17/18 kW models | |
| Spark plugs | Check | 300 hr | 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 |
| Crankcase breather hose | Other | 500 hr | 12 mo | Yearly or 500 hr.; follow engine manufacturer's maintenance manual |
| Replace spark plugs | Replace | 500 hr | ||
| Replace stepper motor coupling and bushing | Replace | 500 hr | 500 hours; authorized distributor/dealer only | |
| Resistance readings of windings with insulation tester (Megger) | Test | 500 hr | 36 mo | 3 yr.; with SCR assembly or rectifier and load leads disconnected |
| Stepper motor coupling and bushing | Replace | 500 hr | 36 mo | Authorized distributor/dealer only; 8.5/12 kW models |
| Wire-cable insulation breakdown | Test | 500 hr | 36 mo | 3 yr. or 500 hr. |
| 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 | |
| AC electrical system general inspection | Inspect | 3 mo | Quarterly | |
| Air ducts and louvers in enclosure | Clean | 12 mo | Yearly; service more frequently in dusty areas | |
| Air ducts, louvers | Clean | 12 mo | Yearly | |
| Battery and rack | Clean | 12 mo | Yearly; remove corrosion, clean and dry | |
| Battery boots | Replace | 12 mo | Inspect and replace if necessary; yearly | |
| Battery charger operation | Test | 1 mo | Monthly |
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
60| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Magnetic pickup air gap | 0.5 | mm (0.020 in.) | |
| Gap | Spark Plug Gap 12/17/18RES | 0.76 | mm (0.030 in.) | |
| Gap | Spark Plug Gap 8.5kW | 0.51 | mm (0.020 in.) | |
| Gap | Spark plug gap | 0.51 | mm (0.020 in.) | |
| Gap | Spark plug gap | 0.76 | mm (0.030 in.) | |
| Other | Brush length, new | 19.05 | mm (0.75 in.) | new |
| Other | Compression ratio | 8.5:1 | ||
| Other | Compression ratio | 9.0:1 | ||
| 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 | Overfrequency shutdown threshold | 110 | % of system frequency setpoint | more than 5 seconds, active 10s after start |
| Other | Underfrequency shutdown threshold | 54 | Hz | more than 5 seconds (or below 56.5 Hz for more than 60 seconds) |
| Pressure | Engine oil pressure | 172--241 | kPa (25--35 psi) | |
| 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 | LP supply pressure | 1.7--2.7 | kPa (7--11 in. water column) | |
| Pressure | Natural gas supply pressure | 1.2--2.7 | kPa (5--11 in. water column) | |
| Resistance | Brush resistance | 0.1--0.2 | ohms (without meter lead resistance) | |
| Resistance | Coolant temperature sensor (CTS) resistance | 180--200 | ohms | at 100 C (212 F) |
| Resistance | Coolant temperature sensor (CTS) resistance | 2100--2500 | ohms | at 30 C (86 F) |
| Resistance | Magnetic pickup resistance across QCON1 and QCON2 | 1.3--1.9 | kOhm | |
| Resistance | Rotor resistance | 4.0 | ohms, cold | cold |
| Resistance | Rotor resistance | 4.2 | ohms, cold | cold |
| Resistance | Stator resistance leads 1-2, 3-4 | 0.07 | ohms, cold | cold |
| Resistance | Stator resistance leads 1-4, 2-5, 3-6, 7-10, 8-11, 9-12 | 0.18 | ohms, cold | cold |
| Resistance | Stator resistance leads 11-44 | 0.14 | ohms, cold | cold |
| Resistance | Stator resistance leads 55-66 | 0.15 | ohms, cold | cold |
| Resistance | Stator resistance leads 55-66 | 0.70 | ohms, cold | cold |
| Resistance | Stepper motor coil resistance per half coil | 38.5 | ohms | |
| 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 | Engine speed, full load (mechanical governor) | 3600 | RPM (60 Hz) | full load |
| Speed | Engine speed, no load (mechanical governor) | 3780 | RPM (63 Hz) | no load |
| 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 | Overspeed shutdown threshold | 115% of normal running speed | rpm | 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 |
| Torque | Alternator assembly overbolts (reassembly) | 7 | Nm (60 in. lb.) | |
| Torque | Alternator overbolts | 7 | Nm (5 ft. lb.) | |
| Torque | Alternator thrubolt | 40 | Nm (28 ft. lb.) | |
| Torque | Cylinder head nuts | 30 | Nm (40.7 ft. lb.) | |
| Torque | Engine muffler flange nuts (reassembly) | 24 | Nm (216 in. lb.) | |
| Torque | Generator adapter bolts (reassembly, 7/16-14 x 1.0 hex cap) | 40 | Nm (28 ft. lb.) | |
| Torque | Generator adapter screws | 40 | Nm (28 ft. lb.) | |
| Torque | Muffler flange bolts | 24 | Nm (17.7 ft. lb.) | |
| Torque | Oil filter | 5.7--9.0 | Nm (4.2--6.7 ft. lb.) | |
| Torque | Rotor thrubolt (reassembly) | 40 | Nm (28 ft. lb.) | |
| 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 (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 |
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 SG, SH, or SJ synthetic | Synthetic oil recommended | ||
| 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 | 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 | ||
| 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
14| 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) |
| 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 | Not used on air-cooled models. | Shutdown | |
| LOC | Loss of coolant | Not used on air-cooled models. | Shutdown | |
| LOP | Low oil pressure shutdown | Shutdown occurs if low oil pressure 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. |
| 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 for service if problem continues. |
| OF | Overfrequency shutdown | Shutdown when governed frequency exceeds 110% of system frequency setpoint for more than 5 seconds; active 10 seconds after engine start. | Shutdown | Contact an authorized distributor/dealer for service if problem continues. |
| OS | Overspeed shutdown | Shutdown occurs if 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 problem continues. |
| OU | Overvoltage shutdown | Shutdown occurs if voltage exceeds 120% of system nominal voltage for more than 2 seconds. | Shutdown | Contact an authorized distributor/dealer for service if problem continues. |
| SCF0 | Software Communication Fault 0 | Indicates a software or communication problem within the controller. | Shutdown | Replace the controller. |
| UF | Underfrequency shutdown | Shutdown when governed frequency falls below 90% of nominal system frequency for more than 5 seconds; active 10 seconds after engine start. (ADC-RES: below 54 Hz.) | Shutdown | Reduce the load and restart the generator set. Contact an authorized distributor/dealer for service if problem continues. |
| UU | Undervoltage shutdown | Shutdown occurs if voltage falls below 80% of nominal system voltage for more than 10 seconds. | Shutdown | Reduce the load and restart the generator set. Contact an authorized distributor/dealer for service if problem continues. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
12Frequency 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).
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 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.
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.
Governor System Operation Test Procedure diagnostic
⚠ Hazardous voltage. Moving parts. Hot engine and exhaust system.
Tools: Voltmeter, Ohmmeter, Feeler gauge
- Verify carburetor throttle linkage is connected to the stepper motor.
- Check for broken or loose wiring if the stepper motor moves erratically.
- Check stepper motor operation at startup: it should move fully open then to fully closed position.
- Stop genset and check magnetic pickup resistance at QCON1 and QCON2 (1.3--1.9 kOhms).
- Verify magnetic pickup voltage output (1.75 VAC minimum during cranking).
- Check/adjust magnetic pickup air gap to 0.5 mm (0.020 in.).
- Disconnect magnetic pickup leads, open circuit breaker, and test controller governing function.
- Check stepper motor coil resistance across pins 2-3 and 1-4 (38.5 ohms per half coil).
Resetting Controller after a Fault Shutdown diagnostic
- Move master switch to OFF/RESET
- Disconnect generator set from load using line circuit breaker or ATS
- Identify and correct the cause of the fault shutdown
- Start generator set by moving master switch to RUN; test operate
- Move master switch to OFF/RESET
- Reconnect generator set to load
- Move master switch to AUTO for remote start
Rotor Test Procedure diagnostic
⚠ Hazardous voltage will cause severe injury or death.
Tools: Ohmmeter, Megohmmeter
- Disable genset and disconnect battery negative lead first.
- Remove the brush cover from the alternator end bracket.
- Raise brushes from slip rings; measure rotor resistance between the two slip rings.
- Perform megohmmeter test: apply 500 VDC to one slip ring and the rotor poles or shaft.
- Reading of approx. 500 kOhms or higher indicates a good rotor; repair or replace if less.
SCR Module Test Procedure diagnostic
⚠ SCR module may be damaged if power supply is connected incorrectly. Connect negative battery lead to positive terminal on SCR module.
Tools: Ohmmeter, 12-volt test lamp (or voltmeter), 12-volt DC power source, 100--500 ohm resistor, Jumper
- Set ohmmeter to R x 1.
- Check (+) to (--) on SCR module: high resistance one direction, low the other.
- Check AC1 to (+): high resistance both directions.
- Check AC1 to (--): high resistance one direction, low the other; repeat for AC2.
- Check G1 to (+): low resistance both directions; repeat for G2.
- Connect negative DC lead to positive (+) terminal on SCR module.
- Connect positive lead with lamp in series to AC1 (lamp should not glow); jumper with resistor from positive to G1 (lamp should glow).
- Repeat step 9/10 for AC2 and G2; replace module if any check fails.
Separate Excitation Procedure diagnostic
⚠ Hazardous voltage will cause severe injury or death. Have qualified personnel perform testing.
Tools: DC ammeter, 20-amp fuse, 12-volt automotive battery
- Disconnect black FN and FP leads from alternator at SCR module (+) and (--) terminals.
- Connect a DC ammeter, 20-amp fuse, and 12-volt battery to FP and FN brush leads; record reading.
- Start engine and check ammeter reading remains stable (increasing = shorted rotor; decreasing/unstable = running open).
- Check for AC output across stator leads and compare to specifications.
- If rotor and stator are good, check wiring, fuses, SCR module, and controller settings.
Stator Continuity and Resistance Tests diagnostic
⚠ High voltage test. Follow test equipment manufacturer instructions; improper procedure can damage equipment.
Tools: Ohmmeter, Megohmmeter
- Disable genset and disconnect all stator leads before all stator tests.
- Set ohmmeter to R x 1 and zero it by holding leads together.
- Check cold resistance of stator windings at leads 1-2, 3-4, and 55-66 (single-phase).
- Use a megohmmeter: apply 500 VDC to a stator lead and the stator frame; repeat for each coil.
- A reading of approximately 500 kOhms or higher indicates a good stator; repair/replace if less.
Air Cleaner Service Procedure maintenance
⚠ A sudden backfire can cause severe injury or death. Do not operate with air cleaner removed.
- Disable the generator set (master switch OFF/RESET, disconnect battery charger, disconnect battery negative lead first).
- Remove foam precleaner and paper element.
- Wash and oil the foam precleaner in warm soapy water, rinse, air dry, saturate with new engine oil, squeeze out excess.
- Replace paper element if dirty, bent, or damaged; do not wash or blow it out.
- Reinstall precleaner over paper element; install element, cover, nut, and cover; finger-tighten knob.
- Enable the generator set (reconnect battery negative lead last, reconnect battery charger).
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 |
|---|---|---|---|---|
| 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 | |
| 120 | Single (L0-L1) | Factory two-pole circuit breaker; 4 stator leads | 1, 2, 3, 4 (output); 11, 44, 55, 66 (sensing/supply) | 60 Hz, 110/220 and 120/240 V, 3-wire configuration; not reconnectable |
| 120 | Single (L0-L2) | Factory two-pole circuit breaker | 60 Hz; not reconnectable | |
| 120 VAC | Utility Power terminals on field-connection terminal block | Utility power circuit must be backed up by the generator set | ||
| 220 | Single (L1-L2) | Factory two-pole circuit breaker | 50 Hz; not reconnectable | |
| 230/400 | Three | Factory connected for 230/400 V, 50 Hz | 12 leads (1-12 output; V7, V8, V9, 55, 66 sensing/supply) | 12TRES 3-phase; not reconnectable |
| 240 | Single (L1-L2) | Factory two-pole circuit breaker | 60 Hz; 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.
Common questions
What size generator is the Kohler 12TRES?
The Kohler 12TRES is rated 12 kW standby.
What engine is in the Kohler 12TRES?
The Kohler 12TRES is powered by the Kohler CH 740 engine.
What fuel type does the Kohler 12TRES take?
The Kohler 12TRES runs on natural gas or propane (LP) vapor.
How much oil does the Kohler 12TRES take?
The Kohler CH 740 engine in the Kohler 12TRES has an oil capacity of 2.0 liters.
What oil filter fits the Kohler 12TRES?
The Kohler 12TRES uses oil filter part number 12 050 01-S.
Troubleshooting
6Fault codes
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| AF | Indicates a shutdown initiated by pushing the emergency stop switch. | Not used on RES models. | Check the position of the emergency stop button. (TRES models only) |
| 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. | Check for blocked air inlets and exhaust outlets. |
| 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). Note: The low oil pressure shutdown does not protect against low oil level. Check the oil level at the engine. | Check for leaks in the lubrication system. Check the oil level and add oil if the level is low. |
| OC | Overcrank shutdown | Shutdown occurs after 3 unsuccessful starting attempts. The crank cycle is set for three starting attempts of 15 seconds cranking and 15 seconds rest. | Check the fuel supply, spark plug, and battery. Check for loose connections. Contact an authorized distributor/dealer for service if problem continues. |
Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Generator does not start | Low battery voltage or faulty starter motor | Check the battery and ensure it is fully charged. If necessary, replace the battery. Check the starter motor for proper operation. |
| Gas fuel leaks can cause an explosion. | Check the LPG vapor or natural gas fuel system for leakage by using a soap and water solution with the fuel system test pressurized to 6--8 ounces per square inch (10--14 inches water column). Do not use a soap solution containing either ammonia or chlorine because both prevent bubble formation. A successful test depends on the ability of the solution to bubble. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Kohler 12TRES troubleshooting guide (27 entries) →
Parts
250| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 103-0731 | Gasket, Gearcase | 1 | Gasket | Amazon eBay |
| 103-0733 | Gasket, Gearcase Backplate | 1 | Gasket | Amazon eBay |
| 103-0746 | Gearcase (Includes Oil Seal and Oil Fill Tube) | Seal | Amazon eBay | |
| 110-1718 | Head, Cylinder Gasket, Cylinder Head | 2 | Gasket | Amazon eBay |
| 110-2987 | Gasket, Cylinder Head | 2 | Gasket | Amazon eBay |
| 110-3225 | Gasket, Cylinder Head | 1 | Gasket | Amazon eBay |
| 12 050 01 | Oil filter | 1 | Oil filter | Amazon $30.38 eBay KuduParts $11.00 |
| 12 050 01-S | Filter, oil | 40 | Filter | Amazon $30.38 eBay KuduParts $32.00 |
| 12 132 02-S | Spark plug | 2 | Spark plug | buy |
| 120-0491 | Pump, Oil | 1 | Pump | Amazon eBay $30.00 |
| 120-1041 | Bearing, Oil Pump Idler Gear (Semi Finished) | 1 | Pump | Amazon eBay |
| 130-0755 | 8racket, Mounting Heater, Tank - 850 Watt, 115 Volt (Includes Hose Connector, Cord and Mounting Strap) | 1 | Hose | Amazon eBay |
| 130-2500 | Guard, Belt (Left Side) | 1 | Belt | Amazon eBay |
| 134-1437 | Spring - Injecion Pump Lever | 1 | Pump | Amazon eBay |
| 140-1787 | Hood, Air Cleaner | 1 | Air filter | Amazon eBay |
| 140-1791 | Indicator. Service Hood, Air Cleaner | 1 | Air filter | Amazon eBay |
| 140-1841 | Cleaner. Air (Includes Element) | 1 | Air filter | Amazon eBay |
| 140-2174 | Cleaner, Air - Oil Bath Band. Mount ing | 1 2 | Air filter | Amazon eBay |
| 140-2234 | Tube. Air Inlet | Hose | Amazon eBay | |
| 141-0982 | Gasket | 2 | Gasket | Amazon eBay |
| 141-0983 | Gasket, Carburetor | 1 | Gasket | Amazon eBay |
| 147-0436 | Seal, Injector | 6 | Seal | Amazon eBay |
| 147-0465-12 | Pump, Fuel Injection (See Separate Page for Components) | 1 | Pump | Amazon eBay |
| 147-0701 | Injector, Fuel (Includes Seal) | 6 | Seal | Amazon eBay |
| 147-0856 | Injector, Fuel (Includes Parts Marked #) | 2 | Injector | Amazon eBay FridayParts $72.02 |
| 147-0864 | #O'Ring, Injector | 2 | Injector | Amazon eBay |
| 147-0865 | #O'Ring, Injector | 2 | Injector | Amazon eBay |
| 147-2715 | Remote Fuel Pump Kit EFI (HGJAA) | 1 | Fuel pump | Amazon eBay |
| 149-1445 | Filter | 1 | Gasket | Amazon eBay $19.95 |
| 149-1446 | (l/8 NPT x l/4 ID Hose) (SP=c 01 | 1 | Gasket | Amazon eBay |
| 149-1828 | Pump, Fuel - Electric (12 VGC) | 1 | Pump | Amazon eBay $39.59 FridayParts $40.41 |
| 149-1914-04 | Element, Filter (Includes O-fling Seal) (2 M~CPXI) | 1 | Seal | Amazon eBay |
| 149-1920 | Plate, Mounting - Fuel Filter Elbow, Hose - Male | 1 | Fuel filter | Amazon eBay |
| 149-1921 | Plate, Mounting - Fuel Filter Elbow, Hose - Male | 1 | Fuel filter | Amazon eBay |
| 149-1922 | Spacer, Mounting - Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 149-1949 | Head Assembly. Replacement (Includes Vent Plug. O-Ring Seals. Pump Assembly and Tube) Seal) | 1 | Seal | Amazon eBay |
| 149-1953 | Knob and Seal) | 1 | Seal | Amazon eBay |
| 149-2106 | Fuel Filter Element | 1 | Fuel filter | Amazon $15.99 eBay $34.99 KuduParts $68.00 |
| 149A159 | Gasket - Spacer - BLAKING mfr. pump only | 1 | Gasket | Amazon eBay |
| 149A551 | Lever, Hand Primer - ONAN mfr. pump only | 1 | Pump | Amazon eBay |
| 149D693 | Pump, Fuel - ONAN mfr., with primer lever - Replaces earlier atyle pumps used, of any manufacture | 1 | Pump | Amazon eBay |
| 149K526 | Repair Kit, Fuel Pump - Includes parts marked (*)- For ONAN mfr. or BLAKING mfr. pumps only - If not available, or If pump mfr. {s not known, thett se 149K74 oo... | 1 | Fuel pump | Amazon eBay |
| 149K74 | Repair Kit, Fuel Pump - Includes parts marked (* anda) - For AC mfr., BLAKING mfr. or ONAN mfr. pumps | 1 | Fuel pump | Amazon eBay |
| 151-0437 | Kit. Throttle Modification (Fuel Injection Pump) | 1 | Fuel pump | Amazon eBay |
| 1512-0154 | Belt Fan | 1 | Belt | Amazon eBay |
| 154-3067-02 | Manifold Assy, Intake (Includes Hose Connector) | 1 | Hose | Amazon eBay |
| 154-3085 | Gasket, Intake Manifold | 2 | Gasket | Amazon eBay |
| 154P570 | Union, Manifold Flange | 2 | Exhaust | Amazon eBay |
| 155-2073 | Gasket, Exhaust Pipe | 1 | Gasket | Amazon eBay |
| 155-2415 | Seal, Muffler Support | 18 | Seal | Amazon eBay |
| 155-2619 | Spec D, Exhaust Manifold) *Gasket. Elbow - Exhaust (WC 0) | 1 | Gasket | Amazon eBay |
| 15SA47 | Tube, Flexible Exhaust | 2 | Exhaust | Amazon eBay |
| 165-2203 | Gasket, Manifold - Exhaust (&xx A-C) | : | Gasket | Amazon eBay |
| 168-0174 | Kit, Gasket - Valve Grind | 1 | Gasket | Amazon eBay |
| 185-2175 | Gasket | 1 | Gasket | Amazon eBay |
| 185-2199 | Band, Mounting - Air Cleaner | 1 | Air filter | Amazon eBay |
| 185-2203 | Gasket, Manifold - Exhaust (&xx A-C) | 1 | Gasket | Amazon eBay |
| 185-2239 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 185-2240 | Clamp, Hose | 2 | Hose | Amazon eBay |
| 185-2266 | Alternator (12 VDC) (See Separate Page for Components) | 1 | Alternator | Amazon eBay |
| 185-2284 | Gasket * −Parts Included in Control Plate Assy. | 1 | Gasket | Amazon eBay |
| 185-2300 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 185-2311 | Housing, Thermostat | 1 | Thermostat | Amazon eBay FridayParts $27.75 |
| 185-2421 | Hose, Rubber - Overflow | 1 | Hose | Amazon eBay |
| 187-6224 | Gasket, Rocker Cover | 1 | Gasket | Amazon eBay |
| 187-6230 | Gasket, Cylinder Head (1) | 1 | Gasket | Amazon eBay |
| 187-6238 | Gasket, Breather Plate | 1 | Gasket | Amazon eBay |
| 191-1368 | Arm, Alternator Adjusting | 1 | Alternator | Amazon eBay |
| 191-1872 | Alternator (12 VDC) (Gl) | 1 | Alternator | Amazon eBay |
| 191-1983-01 | Alternator | 1 | Alternator | Amazon eBay |
| 191-2085 | Strap, Alternator Adjust | 1 | Alternator | Amazon eBay |
| 193-0247 | 'Sender, Temperature - Engine Coolant | 1 | Sensor | Amazon eBay |
| 193-0469 | Sensor, Map | 1 | Sensor | Amazon eBay |
| 193-0480 | Sensor, Manifold Air Temperature | 1 | Sensor | Amazon eBay |
| 24 032 19-S | Seal, oil front | 1 | Seal | FridayParts $10.99 |
| 24 050 01-S | Filter, breather | 8 | Filter | buy |
| 24 083 02 | Precleaner element | 1 | Air filter | buy |
| 24 083 08 | Air cleaner element | 1 | Air filter | buy |
| 24 083 08-S | Element, air filter | 1 | Air filter | buy |
| 24 083 09-S | Element, air filter | 1 | Air filter | buy |
| 24 153 01-S | O-ring | 1 | Seal | buy |
| 24 153 08-S | O-ring | 1 | Seal | buy |
| 24 153 21-S | O-ring, oil cooler | 1 | Seal | buy |
| 24 393 51-S | Kit, oil pump assembly (includes items 12, 13) | 1 | Pump | buy |
| 24 590 01-A | Oil Cooler, 14RCA/L | Oil cooler | buy | |
| 24 590 27 | Dipstick | Oil dipstick | buy | |
| 24 590 29 | Oil Fill | 1 | Oil fill | buy |
| 241927 | Sensor, speed | 1 | Sensor | Amazon eBay |
| 25 032 06-S | Seal, oil | 1 | Seal | FridayParts $11.90 |
| 25 099 26-S | Switch, oil pressure | 1 | Sensor | buy |
| 25 132 14-S | Spark plug (RFI) | 2 | Spark plug | buy |
| 25 158 08-S | Bushing, linkage retaining | 1 | Bushing | buy |
| 25 435 06-S | Kit, starter solenoid | 1 | Kit | buy |
| 269373 | Alternator Assembly | 5 | Alternator | Amazon eBay |
| 300-2409 | Regulator PC board (switching voltage regulator board assembly) | 1 | Avr | Amazon eBay |
| 300-2906 | Board Assy, Printed Circuit - Over/Under Volt Sensor (A17) | i | Sensor | Amazon eBay |
| 302-0750 | 'Sender, Tachometer | 1 | Sensor | Amazon eBay |
| 305-0695-02 | Regulator assembly - voltage (switching voltage regulator assembly) | 1 | Avr | Amazon eBay |
| 305-0901 | Sensor, Low Battery Voltage | 1 | Sensor | Amazon eBay |
| 307-1061 | Relay, Starter Protection | 1 | Starter | Amazon eBay |
| 309-0178 | 'Switch, Thermostatic - Hi Engine Coolant Temperature | 1 | Sensor | Amazon eBay $350.00 |
| 309-0179 | 'Switch, Thermostatic - Hi Engine Coolant Temperature | 1 | Sensor | Amazon eBay |
| 309-0269 | Switch, Low Engine Temperature (S4) | 1 | Sensor | Amazon eBay |
| 323-1591 | # Plug, Seal (E1) | 1 | Seal | Amazon eBay |
| 323-1708 | # Seal, Cable (P8) | 4 | Seal | Amazon eBay |
| 358072 | 3/8"-16 UNC-2A THD Thrubolt | 1 | Thrubolt | Amazon eBay |
| 420A248 | Oil Filter | 1 | Oil filter | Amazon Amazon eBay eBay |
| 502-0068 | Tee (3/8' x 5/8' x 5/8') to | 1 | Hose | Amazon eBay |
| 502-0313 | Elbow, Hose − 90° (1/8” Pipe to 1/4” Hose) | 54 | Hose | Amazon eBay |
| 502-0433 | [;b'$P&x 5/16 ID Hose] | 1 | Hose | Amazon eBay |
| 502-0613 | Connector, Hose | 1 | Hose | Amazon eBay |
| 502-0869 | Connector (3/8') | 1 | Hose | Amazon eBay |
| 502-0870 | Tee, Hose | 1 | Hose | Amazon eBay |
| 502-1314 | Connector, Hose | 1 | Hose | Amazon eBay |
| 503-0183 | Clamp, Hose | 2 | Hose | Amazon eBay |
| 503-0365 | Clamp, Hose | 4 | Hose | Amazon eBay |
| 503-0594 | Hose, Rubber - Preformed | 1 | Hose | Amazon eBay |
| 503-059b | Hose, Rubber - Preformed | 1 | Hose | Amazon eBay |
| 503-0685 | Clamp, Hose | 1 | Hose | Amazon eBay $15.00 |
| 503-1058 | Spacer, Fan Hose, Radiator - Upper | 1 | Hose | Amazon eBay |
| 503-1062 | Hose - Intake Manifold Water Pump (3/8' ID) | 1 | Hose | Amazon eBay |
| 503-1074 | Hose Reducer | 1 | Hose | Amazon eBay |
| 503-1084 | Elbow. Reducer | Hose | Amazon eBay | |
| 503-1250 | Hose, Water Bypass (5/8' Ill) | 1 | Hose | Amazon eBay |
| 503-1251 | Hose, Water Bypass (5/8' 10] | 1 | Hose | Amazon eBay |
| 503-1450 | Hose, Cleaner - Air | 1 | Hose | Amazon eBay |
| 503-1552-01 | Ho!M? (5/8' ID X 14') | 2 | Hose | Amazon eBay |
| 503-2126 | Hose, Vacuum | 1 | Hose | Amazon eBay |
| 503-365 | Clamp, Hose | 2 | Hose | Amazon eBay |
| 505-0180 | Plug, Pipe (1-1/4"), Air Cleaner Adapter and Intake Manifold | 1 | Air filter | Amazon eBay |
| 505-382 | Nipple, Exhaust(3"x 2-5/8") | 2 | Exhaust | Amazon eBay |
| 505-4 | Hose (Order 6 “of Bulk Hose Number 503-324) | I 9 | Hose | Amazon Amazon eBay |
| 509-0125 | Seal, 011- 'O' Ring | 1 | Seal | Amazon eBay |
| 509-0191 | Seal, Oil (Includes Wear S1eeve ) | 1 | Seal | Amazon eBay |
| 509-0196 | O'Ring | 1 | O-ring | Amazon eBay |
| 511-0112 | Belt, Fan | 1 | Belt | Amazon eBay |
| 515-0094 | Key, Crankshaft Woodruff Belt | 1 | Belt | Amazon eBay |
| 52 099 08-S | Switch, oil pressure | 1 | Switch | buy |
| 520-2403 | Stud, Injection Pump (M8) | 3 | Pump | Amazon eBay |
| 526-0018 | Gasket, Flange (1-3/4) | 1 | Gasket | Amazon eBay FridayParts $1002.50 |
| 526-0029 | *Washer, Flat (1/2") | 1 | Washer | Amazon eBay |
| 62 590 01 | Oil Cooler, 20RCA/L | Oil cooler | buy | |
| 718-1069 | Fan Pldl@y Sell. Vee Smwv, Cap Hex Head (M8 X I 25 X 25] | 1 | Belt | Amazon eBay |
| 750-1004 | Nut, Hex (M6 x 1) Washer, Lock - Spring (M6) Adapter, Hose Hose, Rubber - Preformed | 1 | Hose | Amazon eBay |
| 870-0257 | Nut, Locking (5/16−18) * − Parts Used On Heat Exchanger Installations With Automatic Water Regulator # − Cut Off And Discard Swivel Connector End Of Hose So That 1/8 NPT Connector End Measures Length As Indicated Above + − Parts Used On Heat Exchanger Installations Without Automatic Water Regulator | 2 | Hose | Amazon eBay |
| ADV-6823-A | Air Filter, Spark Plug Location | 1 | Air filter | Amazon eBay |
| BKR-8YU11 | Spark Plug, CH20/CH740 | 4 | Spark plug | Amazon eBay |
| GM101737 | Lifting bars | 4 | Lifting bar | Amazon eBay |
| GM102176 | Oil pressure sensor boot | 1 | Sensor | Amazon eBay |
| GM103743 | Emergency Stop Switch (optional) | 1 | Emergency stop switch | Amazon eBay |
| GM111084 | Shutdown Switch | 1 | Shutdown switch | Amazon eBay |
| GM28823 | Sensor, oil temperature | 1 | Sensor | Amazon eBay $50.00 |
| GM28981 | UEGO sensor interface harness | Sensor | eBay | |
| GM29253-GA2 | Controller Wiring Diagram | 1 | Controller wiring diagram | Amazon eBay |
| GM29358-B | Point-to-Point Wiring Diagram, Single Phase | 1 | Point-to-point wiring diagram | Amazon eBay |
| GM29385 | UEGO oxygen sensor service kit | Sensor | eBay | |
| GM51559 | 3/8"-16 UNC-2A THD Thrubolt | 1 | Thrubolt | Amazon eBay |
| GM80980 | Brush(es) | 1 | Brush | Amazon eBay |
| GM90969-KP1-QS | 3" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| GM90969-KP2-QS | 4" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| GM92228-KP1-QS | 3" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| GM92228-KP2-QS | 4" Concrete Mounting Pad (only comes in quantities of 5) | Physical | Amazon eBay | |
| KO3226 | Starter Service Kit | 1 | Starter | Amazon eBay |
| RSP-FT-02-US-91 | Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter. | Air filter | Amazon eBay | |
| RSP-FT-04-US-91 | Pack first: complete service kit comprising air filter, air pre filter, spark plugs and oil filter. | Air filter | Amazon eBay | |
| X-465-7 | Hose, 40 in. | 1 | Hose | Amazon eBay |
| X-6422-31 | Seal | Seal | eBay | |
| 098-7130 | Label, Warning Heat | 1 | Service part / kit | Amazon eBay |
| 098-7369-01 | HDCAC | 2 | Service part / kit | Amazon eBay |
| 098-7374 | Label, Warning | 1 | Service part / kit | Amazon eBay |
| 098-7375 | Label, Switch | 1 | Service part / kit | Amazon eBay |
| 098-7376 | Label, Circuit Breaker | 1 | Service part / kit | Amazon eBay |
| 098-7398-01 | HDCAA | 2 | Service part / kit | Amazon eBay |
| 098-7398-02 | HDCAB | 2 | Service part / kit | Amazon eBay |
| 098-7399-01 | 45A, 2 Pole | 1 | Service part / kit | Amazon eBay |
| 098-7399-02 | 50A, 2 Pole | 1 | Service part / kit | Amazon eBay |
| 098-7461 | Label, Warning Hazardous Voltage | 1 | Service part / kit | Amazon eBay |
| 098-7462 | Label, Service Information Label, Model Ident | 1 | Service part / kit | Amazon eBay |
| 098-7463 | Label, Fuel Attachment | 1 | Service part / kit | Amazon eBay |
| 098-7464 | Label, Coolant Drain | 1 | Service part / kit | Amazon eBay |
| 098-7465-03 | Label, Control Face | 1 | Service part / kit | Amazon eBay |
| 098-7466 | Label, Control Rear | 1 | Service part / kit | Amazon eBay |
| 098-7497-01 | Label, Warning Install | 1 | Service part / kit | Amazon eBay |
| 098-7498-01 | Label, Warning Hazardous | 1 | Service part / kit | Amazon eBay |
| 098-7515-01 | Label, Warning Voltage | 1 | Service part / kit | Amazon eBay |
| 1-24-67 | Crankshaft | 1 | Service part / kit | Amazon eBay |
| 10-24-658 | Air Intake | 1 | Service part / kit | Amazon eBay |
| 101-0439 | Plate, Rear Bearing Bearing, Crankshaft | 1 | Service part / kit | Amazon eBay |
| 102-0778 | Adapter, Pipe - Oil Drain | 1 | Service part / kit | Amazon eBay |
| 104-0032 | Gear, Crankshaft | 1 | Service part / kit | Amazon eBay |
| 104-0091 | Washer, Flat (Special) | 20 | Service part / kit | Amazon eBay |
| 104-1953 | Washer, Flat (1/2' ID x 2.25' OD) | 1 | Service part / kit | Amazon eBay |
| 104-1958 | Marked *) Spec A/B Begin Spec C *Pulley Assy, Drive (Includes | 1 | Service part / kit | Amazon eBay |
| 104-2000 | Marked *) Spec A/B Begin Spec C *Pulley Assy, Drive (Includes | 1 | Service part / kit | Amazon eBay |
| 105-0058 | Plunger, Camshaft | 1 | Service part / kit | Amazon eBay |
| 105-0059 | Spring, Plunger | 1 | Service part / kit | Amazon eBay |
| 105-0508 | Shaft, Idler Gear | 1 | Service part / kit | Amazon eBay |
| 105-0513 | Gear, Idler (Includes Finished 8earing) | 1 | Service part / kit | Amazon eBay |
| 105-0519 | 8earing, Idler Gear (Semi Finished) | 1 | Service part / kit | Amazon eBay |
| 105-0541 | Washer | 1 | Service part / kit | Amazon eBay |
| 105-0641 | Gear (Includes Spacer and | 1 | Service part / kit | Amazon eBay |
| 105-0676 | Camshaft | 1 | Service part / kit | Amazon eBay |
| 10S-2283 | Cap | 1 | Service part / kit | Amazon eBay |
| 11-24-3 | Exhaust | 1 | Service part / kit | Amazon eBay |
| 110-0904 | Rotocap, Exhaust | 1 | Service part / kit | Amazon eBay FridayParts $124.86 |
| 110-1719 | Valve, Exhaust | 2 | Service part / kit | Amazon eBay |
| 110-2181-03 | .50 MM Oversize | 6 | Service part / kit | Amazon eBay |
| 110-2781-01 | Standard | 6 | Service part / kit | Amazon eBay |
| 110-2781-02 | .25 MM Oversize | 6 | Service part / kit | Amazon eBay |
| 110-3045 | Standard | 1 | Service part / kit | Amazon eBay FridayParts $124.86 |
| 110-3226-01 | Standard | 6 | Service part / kit | Amazon eBay |
| 110-3226-02 | .25 MM Oversize | 6 | Service part / kit | Amazon eBay |
| 110-3226-03 | .50 MM Oversize | 6 | Service part / kit | Amazon eBay |
| 110-3245 | Cap, Valve Stem (Not used on some early models) | 1: | Service part / kit | Amazon eBay |
| 110-3462 | Standard | 2 | Service part / kit | Amazon eBay |
| 110-3462-01 | .002 Oversize | 2 | Service part / kit | Amazon eBay |
| 110-3462-02 | .005 Oversize | 2 | Service part / kit | Amazon eBay |
| 110-3462-03 | .010 Oversize | 2 | Service part / kit | Amazon eBay |
| 110-3462-04 | .025 Oversize | 2 | Service part / kit | Amazon eBay |
| 110-3490 | 0.5 MM Oversize | Service part / kit | Amazon eBay | |
| 110-3655 | .005' Oversize | 2 | Service part / kit | Amazon eBay |
| 110-3655-05 | .005 Oversize | 2 | Service part / kit | Amazon eBay |
| 110-3655-10 | .010 Oversize | 2 | Service part / kit | Amazon eBay |
| 112-0265 | Piston (Includes Pin, Rings and Retaining Rings) Oversize Oversize Oversize Oversize | 2 | Service part / kit | Amazon eBay |
| 112-0265-01 | .010 Oversize | 2 | Service part / kit | Amazon eBay |
| 112-0265-02 | .020 Oversize | 2 | Service part / kit | Amazon eBay |
| 112-0265-03 | .030 Oversize | 2 | Service part / kit | Amazon eBay |
| 112-0265-05 | .005 Oversize | 2 | Service part / kit | Amazon eBay |
| 112-0267 | Ring, Retaining | 2 | Service part / kit | Amazon eBay |
| 112-0268 | Pin, Piston Ring, Retaining | 2 | Service part / kit | Amazon eBay |
| 113-0311 | Standard | 2 | Service part / kit | Amazon eBay |
| 113-0311-01 | .010 Oversize | 2 | Service part / kit | Amazon eBay |
| 113-0311-02 | .020 Oversize | 2 | Service part / kit | Amazon eBay |
| 113-0311-03 | .030 Oversize | 2 | Service part / kit | Amazon eBay |
| 113-0311-05 | .005 Oversize | 2 | Service part / kit | Amazon eBay |
| 114-0036 | Bushing, Bearing, Connecting Rod | 2 | Service part / kit | Amazon eBay |
| 114-0188 | Standard | 4 | Service part / kit | Amazon eBay |
| 114-0188-02 | .002 Undersize | 4 | Service part / kit | Amazon eBay |
| 114-0188-10 | .010 Undersize | 4 | Service part / kit | Amazon eBay |
| 114-0188-20 | .020 Undersize | 4 | Service part / kit | Amazon eBay |
| 114-0203 | Rod, Connecting (Includes Bolt and Bushing) | 2 | Service part / kit | Amazon eBay |
| 115-0202 | Ball, Rocker Arm | 1: | Service part / kit | Amazon eBay |
| 115-0204 | Short | 6 | Service part / kit | Amazon eBay |
| 115-0253 | Pushrod | 1; | Service part / kit | Amazon eBay |
| 115-0270 | Long | 6 | Service part / kit | Amazon eBay |
| 115-0313 | Guide, Pushrod | 3 | Service part / kit | Amazon eBay |
| 115-0315 | Locknut, Rocker Arm | ;; | Service part / kit | Amazon eBay |
| 115-0316 | Arm, Rocker | Service part / kit | Amazon eBay | |
| 12-24-1216 | Engine Decals | 1 | Service part / kit | Amazon eBay |
| 120-0920 | Tube, Rocker Arm Oil | 1 | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
Operator's manual (Kohler)Operator's manual — 12 RES Operation (Kohler)Operator's manual — tp6515 (Kohler)Parts manual — engine controls stepper motor, governor (Kohler)Service manual — tp6196 (Kohler)Service manual — tp6792 (Kohler)