Service parts for the 26RCA
Grouped by system, with how many of each the parts manual calls for.
Electrical
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | LPG/Natural Gas |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 24 kW |
| Standby kVA | 24 |
| Controller | RDC2 |
| Oil capacity | 1.9 L |
| Alternator | 2F8 (2-pole, Class H insulation) |
| Voltage options | 120/240 V |
| Phase | 1 |
| Rated current | 100 A |
| Power factor | 1.0 |
| Circuit breaker | 125 A |
| Battery group | 51 |
| Battery cranking | 500 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Starting system | 12 V DC |
| Dimensions (L×W×H) | 1193×660×820 mm |
| Dry weight | 283 kg |
| Sound level | 56.0 dBA @ 7 m |
Maintenance & consumables
for the Kohler CH740 / CH1000 / CH1006| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Clean the air cleaner components and replace a dirty, bent, or damaged element. | — | 27 hr | ||
| Fuel filter | — | ||||
| Oil filter | — | ||||
| Battery | Check battery electrolyte level monthly. Clean the battery and cables. Check specific gravity of each cell using a hydrometer. | EZ-273000-J | 31 hr | Amazon eBay | |
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| Spark plug | — | 41 hr |
Service intervals
40| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| 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, 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 | ||
| Change oil (14 kW) | Change | 100 hr | 12 mo | Yearly or 100 hours |
| Oil cooler (20/26 kW) | Clean | 100 hr | 12 mo | Yearly or 100 hours; inspect and clean |
| Replace filter (20/26 kW) | Replace | 100 hr | 12 mo | Yearly or 100 hours |
| Oil change (20/26 kW) | Change | 150 hr | 12 mo | Yearly or 150 hours |
| Replace oil filter (14 kW) | Replace | 200 hr | 12 mo | Yearly or 200 hours |
| Air cleaner service | Replace | 300 hr | 12 mo | Yearly or hours shown; clean at 150 hours, replace at 300 hours; more often in dusty/dirty conditions |
| Brushes and collector ring | Inspect | 300 hr | 12 mo | Yearly or 300 hours; authorized dealer only |
| Optional 300 hour extended life oil change kit (26 kW) | Change | 300 hr | 24 mo | 2 years or 300 hours |
| Spark plugs (14 kW) | Replace | 300 hr | Hours shown | |
| Spark plugs (20/26 kW) | Replace | 300 hr | 150/300 hours shown | |
| Crankcase breather hose | Inspect | 500 hr | 12 mo | Yearly or 500 hours |
| Replace stepper motor coupling and bushing | Replace | 500 hr | Authorized dealer only | |
| Wire-cable insulation condition | Inspect | 500 hr | 36 mo | 3 years or 500 hours |
| Air ducts, louvers | Clean | 12 mo | Yearly | |
| Battery and rack corrosion | Clean | 12 mo | Yearly | |
| 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 and boots | Clean | 12 mo | Yearly | |
| Clean and tighten battery terminals and inspect boots | Check | 12 mo | Yearly | |
| Control and power wiring connections | Check | 12 mo | Tighten; Yearly | |
| Exhaust insulation, fire hazards | Inspect | 12 mo | Yearly | |
| Flexible fuel lines and connections | Inspect | 3 mo | Replace as necessary; Quarterly | |
| Fuel piping | Inspect | 12 mo | Yearly | |
| Generator visible wear or damage | Inspect | 3 mo | Quarterly | |
| Generator, visible wear or damage | Inspect | 3 mo | Quarterly | |
| Interior of sound enclosure | Clean | 3 mo | Quarterly | |
| Measure and record resistance of windings (Megger) | Test | 36 mo | 3 years; authorized dealer only; SCR/rectifier and load leads disconnected | |
| Remote control system, if equipped | Test | 1 mo | Monthly | |
| Remove corrosion, clean and dry battery and rack | Clean | 12 mo | Yearly | |
| Tighten control and power wiring connections | Adjust | 12 mo | Yearly | |
| Visible wear or damage (AC electrical) | Inspect | 3 mo | Quarterly | |
| Winding insulation resistance readings (Megger) | Test | 36 mo | Authorized dealer only, SCR assembly/rectifier and load leads disconnected; 3 years | |
| Wire abrasions where subject to motion | Check | 6 mo | 6 months | |
| Wire abrasions where subject to motion | Inspect | 6 mo | Six months |
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
59| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Spark plug gap | 0.76 | mm (0.030 in.) | |
| Other | Battery specific gravity, fully charged | 1.260 | specific gravity | corrected to 80 F (26.7 C) |
| Other | Battery specific gravity, needs charging | below 1.215 | specific gravity | corrected to 80 F (26.7 C) |
| Other | Battery wrap length | 1067 (42) | mm (in.) | |
| Other | Battery wrap length | 864 (34) | mm (in.) | |
| Other | Heater wrap rating | 50 | Watts | |
| Other | Heater wrap rating | 65 | Watts | |
| Other | Plug cord length | 75 (3) | mm (in.) | |
| Other | Power cord length | 1677 (66) | mm (in.) | |
| Other | Power cord length | 1830 (72) | mm (in.) | |
| Other | Power cord length | 483 (19) | mm (in.) | |
| Other | Starting battery rating | 500 | CCA at 0°F | 12-volt group 51 |
| Pressure | Engine oil pressure | 172-241 | kPa (25-35 psi) | |
| Pressure | Fuel pressure required, LPG | 1.7-2.7 | kPa (7-11 in. H2O) | |
| Pressure | Fuel pressure required, Natural Gas | 0.9-2.7 | kPa (3.5-11 in. H2O) | |
| Resistance | Resistance through brushes | 0.1-0.2 | ohms | without meter lead resistance |
| Resistance | Rotor insulation (megohmmeter) | 500 | kOhms minimum | 500 VDC applied |
| Resistance | Rotor resistance, cold (14 kW) | 5.2 | ohms | cold |
| Resistance | Rotor resistance, cold (20 kW) | 5.6 | ohms | cold |
| Resistance | Rotor resistance, cold (26 kW) | 6.4 | ohms | cold |
| Resistance | Stator insulation (megohmmeter) | 500 | kOhms minimum | 500 VDC applied |
| Resistance | Stepper motor coil resistance (per half coil) | 38.5 | ohms | |
| Resistance | Temperature sensor (OTS) resistance at 100C (212F) | 180-200 | ohms | 100 C (212 F) |
| Resistance | Temperature sensor (OTS) resistance at 30C (86F) | 2100-2400 | ohms | 30 C (86 F) |
| Speed | Crank disconnect speed | 750 | RPM (12.5 Hz) | |
| Speed | Engine run speed 60 Hz / 50 Hz | 3600 / 3000 | RPM | |
| Speed | Engine speed high shutdown | 115 | % of normal running speed for >0.3 sec | |
| Speed | Engine speed low shutdown | 85 | % of normal running speed for >3 sec | |
| Speed | Frequency regulation steady state | 0.5% | % | |
| Speed | Overspeed shutdown test | 115 | % of rated speed (69 Hz @60 Hz, 58 Hz @50 Hz) | |
| Temperature | Controller operating temperature | -30 to 70 | C | |
| Temperature | Controller storage temperature | -40 to 85 | C | |
| Temperature | Exhaust gas exiting the enclosure at rated kW | 260 | °C (500°F) | rated kW |
| Temperature | High lube oil temperature shutdown | 325 | F (163 C) | |
| Temperature | High lube oil temperature warning | 300 | F (149 C) | |
| Temperature | Thermostat off temperature | 27 | C (80 F) | |
| Temperature | Thermostat on temperature | 16 | C (60 F) | |
| Torque | Alternator adapter bolts (14/20 kW) | 69 | Nm (51 ft. lb.) | |
| Torque | Alternator adapter bolts (26 kW) | 69 | Nm (51 ft. lb.) | |
| Torque | Alternator mounting bolts (14/20 kW) | 14.9 | Nm (11 ft. lb.) | |
| Torque | Alternator mounting bolts (26 kW) | 14.9 | Nm (11 ft. lb.) | |
| Torque | Alternator thrubolt (14/20 kW) | 85 | Nm (63 ft. lb.) | |
| Torque | Alternator thrubolt (26 kW) | 85 | Nm (63 ft. lb.) | |
| Torque | End bracket mounting screws | 23 | Nm (17 ft. lb.) | star pattern, tighten twice |
| Torque | Fan bolts (26 kW) | 10.9 | Nm (8 ft. lb.) | |
| Torque | Fan screws M6 (26 kW) | 10.9 | Nm (8.0 ft. lb.) | add Blue Loctite 242 |
| Torque | Generator adapter mounting screws (14RCA only) | 40 | Nm (28 ft. lb.) | |
| Torque | Muffler flange bolts (14/20 kW) | 24 | Nm (17.7 ft. lb.) | |
| Torque | Muffler flange bolts (26 kW) | 24 | Nm (17.7 ft. lb.) | |
| Torque | Oil filter | 3/4 to 1 turn | turn after gasket contact | |
| Torque | Spark plug | 24.4-29.8 | Nm (18-22 ft. lb.) | |
| Torque | Spark plug (14/20 kW) | 24.4-29.8 | Nm (18-22 ft. lb.) | |
| Torque | Spark plug (26 kW) | 24.4-29.8 | Nm (18-22 ft. lb.) | |
| Torque | Vibromounts to skid | 5.4 | Nm (4 ft. lb.) | do not over-tighten |
| Voltage | Auxiliary winding voltage (55 and 66) | 30 | VAC minimum | when AC output above 60 VAC |
| Voltage | Battery charger output | 13.4 ±2% | VDC, max 2.5 A | |
| Voltage | Battery cranking voltage warning threshold | 60 | % (7.2 V or 14.4 V) | during cranking, 6 seconds |
| Voltage | Field voltage FP-FN | 20 | VDC | |
| Voltage | Voltage regulation (no-load to full-load) | 1.0% | RMS |
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 | Full Pressure system | 1.9 L | With filter. Integral oil cooler. | ||
| 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 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 synthetic | Service class SJ or higher | Refer to Oil Matrix chart for oil recommendation based on air temperature | ||
| Engine oil | KOHLER PRO 10W-50 | Service class SJ or higher | All season Kohler PRO 10W-50 is ideal; extends oil/filter change to 300 hours (2 years) with KOHLER PRO extended life oil filter | ||
| 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 | ||
| Fuel | LPG | Nominal fuel rating 2500 Btu/ft.3 (93 MJ/m3) | |||
| Fuel | Natural gas | Nominal fuel rating 1000 Btu/ft.3 (37 MJ/m3) |
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
53| 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 Warning | Loss of AC sensing warning | Less than 5% of rated voltage on Phase A for 1 second, 10 seconds after crank disconnect | Warning | Check loose wiring and connections; check all AC leads; troubleshoot alternator |
| 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. |
| 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. |
| 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 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 from RDC2 |
| Battery Low Warning | Battery Low Warning | Controller measured battery voltage below low warning setting for 90 seconds or more | Warning | Check engine starting battery; check battery charger DC output 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. |
| 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 |
| 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 not connected | Shutdown | Reset emergency stop button and clear fault; if no E-stop button connect ESS and ESN together |
| 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 above high speed setting for 0.3 seconds or more | Shutdown | Troubleshoot engine operation per 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 low speed setting for 3 seconds or more after crank disconnect | Shutdown | Troubleshoot engine; check enclosure thermostat and reset if tripped |
| 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 on Phase A exceeded high frequency setting for 10 seconds | Shutdown | Troubleshoot engine operation per engine service manual |
| 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 less than low limit for 10 seconds or 10 Hz below rated for 60 seconds | Shutdown | Troubleshoot engine; check and reset enclosure thermostat |
| 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 |
| High Lube Oil Temperature Shutdown | High Lube Oil Temperature Shutdown | Oil temperature higher than 325 F (163 C) | Shutdown | See Overheats troubleshooting; check cooling |
| High Lube Oil Temperature Warning | High Lube Oil Temperature Warning | Oil temperature higher than 300 F (149 C) | Warning | See Overheats troubleshooting |
| 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 less than 60% (7.2 V or 14.4 V) for 6 seconds or more | Warning | Check cranking battery |
| 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 engine or alternator detected for 3 seconds or more during cranking | Shutdown | Check cranking circuit; troubleshoot engine and alternator; check aux winding circuit breaker |
| 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 due to overcurrent on DC power supply circuit | Shutdown | Check crank, run, and flash relay circuits for short circuits |
| 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 | RDC2 controller is not in AUTO; generator will not start from ATS or remote device | Warning | Press the Auto button to ensure automatic system operation |
| Oil Pressure Low Shutdwn | Oil Pressure Low Shutdown | Low oil pressure switch closed for 5 seconds or more | Shutdown | Check for oil leaks; check oil level and add oil; check oil pressure sensor |
| 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 | Engine did not start during the crank cycle; 15 second time delay | Shutdown | Check alternator, fuel supply, cranking circuit, and cranking battery |
| RBUS ComError Warning | RBUS Communication Error | Controller lost communication with an RBUS device that previously communicated properly | Warning | Check connection to the RBUS device |
| Spd Sens Flt | Speed Sensor Fault | Engine speed sensor has failed or engine stalled. | Shutdown | Contact an authorized dealer for service. |
| Spd Sens Flt Shutdwn | Speed Sensor Fault | Speed signal was lost | Shutdown | Check leads 55, 66, F+ and F- between alternator and controller; check engine stall |
| Volts L1-L2 (AB) High Shutdwn | Volts L1-L2 High Shutdown | Voltage Phase A to B exceeded high limit for greater than 2 second delay | Shutdown | Troubleshoot alternator |
| Volts L1-L2 (AB) Low Shutdwn | Volts L1-L2 Low Shutdown | Voltage Phase A to B greater than 5% of rated but below low voltage setting for greater than 10 second delay | Shutdown | Troubleshoot alternator; check and reset enclosure thermostat |
| Volts L1-L2 High | Generator Voltage High | Output voltage exceeds 120% of the system nominal voltage for more than 2 seconds. | Shutdown | Contact an authorized dealer for service. |
| Volts L1-L2 Low | Generator Voltage Low | Output voltage falls below 80% of the nominal system voltage for more than 10 seconds. | Shutdown | Reduce the load and restart the generator set. Check enclosure thermostat and reset if tripped. Contact an authorized dealer for service. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
12Fuel Selection, Revised Fuel System adjustment
⚠ Explosive fuel vapors. Can cause severe injury or death.
- Press the OFF button on the generator set controller.
- Disconnect utility power to the generator set.
- Disconnect the engine starting battery, negative lead first.
- Turn off the fuel supply.
- For natural gas, turn the selection knob fully clockwise to line up with the UP arrow.
- For LPG, turn the selection knob counterclockwise approximately 1/4 turn.
- Locate ignition timing leads 65 and N3 near the regulator.
- For natural gas, connect lead 65 to lead N3.
- For LPG, disconnect lead 65 from lead N3.
- Connect and turn on the fuel supply matching the fuel setting.
- Reconnect the engine starting battery, negative lead last.
- Reconnect utility power.
- Change the fuel type setting on the RDC2 controller in the Genset System menu.
- Start the generator set by pressing RUN.
- Check for leaks with a gas leak detector, run the set, and press OFF to shut down.
Voltage Calibration Using RDC2 Keypad adjustment
Tools: Digital voltmeter
- With set off, connect DVM to measure output voltage L1-L2 (AC volts).
- Press RUN to start generator set.
- Press Select, navigate to Generator Metering menu.
- Press Select to display Volts L1-L2; compare with voltmeter.
- If incorrect, press Select (flashes), adjust with arrows, press Select to save.
- Wait 30-60 seconds for voltmeter reading to stabilize.
- For three-phase, repeat for L2-L3 and L3-L1.
- Press OFF to stop generator set.
Checking the Fuel Pressure at the Regulator diagnostic
Tools: Manometer capable of measuring 3-11 inches water column
- Remove the plug from the fuel pressure port.
- Connect a manometer capable of measuring low pressures (3-11 inches water column) to the pressure port.
- When finished, replace the plug in the pressure port and check for leaks.
Governor System Operation Test diagnostic
⚠ Hazardous voltage. Moving parts.
Tools: Ohmmeter
- Verify carburetor throttle linkage is connected to stepper motor.
- Check for broken or loose wiring or plug connections.
- Check stepper motor operation at startup (open then closed position).
- Open circuit breaker, disconnect starting battery, shut off fuel supply.
- Disconnect stepper motor plug P6 to access terminals.
- Check coil resistance across pins 2-3 and pins 1-4.
- Inspect linkage and bushings; replace as necessary.
- Disconnect linkage; verify free full range of motion.
Resetting the Controller After a Fault Shutdown diagnostic
⚠ Always identify and correct cause of fault before resetting
- Press Select to go to Overview menu while fault message is displayed
- Press Select again to show active fault message
- Press Select; 'Confirm Clear Fault: NO' displayed
- Press UP arrow; 'Confirm Clear Fault: YES' displayed
- Press Select to clear fault
- Press Select to return to overview menu; controller changes to OFF mode
- Press AUTO to place generator set in automatic mode
Separate Excitation diagnostic
⚠ Hazardous voltage. Moving parts.
Tools: DC ammeter, 10-amp fuse, 12-volt automotive battery
- Disconnect black FN and FP leads at brush holder terminals.
- Connect DC ammeter, 10-amp fuse, and 12-volt battery to FP/FN brush leads.
- Start engine; verify ammeter reading remains stable.
- Check AC output across stator leads; compare to specifications.
- If rotor and stator good, check wiring, fuses, controller settings.
Test Low Oil Pressure (LOP) Switch diagnostic
Tools: Ohmmeter or continuity tester, Oil pressure gauge
- Press OFF to stop engine.
- Disconnect lead 13 from the switch.
- Use ohmmeter/continuity tester to verify switch is closed (grounded).
- Start engine and verify switch opens after a few seconds.
- If not operating, remove LOP switch, install oil pressure gauge.
- Start and run generator set.
- Verify oil pressure within specified range before replacing LOP switch.
Access the Air Intake Area installation
- Unlock and raise the enclosure roof.
- Pull the air intake panel up and off its four bushings.
- Remove the cover panel over the terminal block to make electrical connections.
- After connections complete and battery installed, reinstall panels.
Battery Installation Procedure installation
⚠ Battery acid can cause severe injury or death
⚠ Explosion hazard from battery gases
- Ensure starting battery is fully charged before placing in service.
- Clean battery posts and/or adapters if necessary.
- Install battery post adapters, if needed.
- Place battery in the housing.
- Connect positive (+) lead to engine starting battery.
- Connect negative (-) lead to engine starting battery.
Checking the OnCue Plus Network Connection installation
Tools: Network cable
- Check for and turn OFF any wireless connections to the laptop.
- Connect the network cable to the laptop and the other end to the customer's router or modem.
- Verify the Internet connection by opening a web browser and going to a known website.
- After verifying the connection, disconnect the network cable from the laptop and turn the laptop wireless connections back on.
Field Connections installation
⚠ Hazardous voltage. Will cause severe injury or death.
⚠ Electrical backfeed to the utility. Can cause property damage, severe injury, or death.
Tools: Conduit fittings
- Punch or drill holes for conduit fittings and feed the cables through the openings.
- Connect the transfer switch emergency source leads to L1, L2, and L3 on the load circuit breaker as applicable.
- Connect the neutral (L0) and ground (GRD) leads from the ATS and main panel to the corresponding connection points.
- Connect AC power source leads to terminal block HOT, NEUTRAL, and GROUND; use a circuit fed by the load side of the transfer switch.
- Connect a Model RXT, RDT, or other transfer switch to the terminal block in the air intake area.
- For optional accessories, connect the PIM and/or load shed kit; connect the cable shield to the ground lug near the terminal block.
- For OnCue Plus, choose a hard-wired or wireless connection and follow the instructions.
- Replace the cover plate when connections are complete.
Fuel Conversion from NG to LPG, 14RCA/L (Original Fuel System) installation
⚠ Disconnect battery before working on generator set
⚠ Explosive fuel vapors can cause severe injury or death
Tools: straight-blade screwdriver, gas leak detector
- Press OFF button on generator set controller.
- Disconnect utility power to the generator.
- Disconnect engine starting battery, negative lead first.
- Turn off and disconnect the fuel supply.
- Remove hose clamp and fuel hose from hose fitting.
- Use straight-blade screwdriver to remove NG orifice from hose fitting.
- Insert LPG orifice into hose fitting and tighten until snug.
- Slide hose onto hose fitting and secure with clamp.
- Disconnect ignition timing leads 65 and N3 for LPG.
- Connect and turn on the new fuel supply.
- Reconnect battery leads, negative lead last.
- Reconnect utility power to the generator.
- Start generator by pressing RUN button.
- Check for leaks using a gas leak detector.
- Run generator and check operation; press OFF when done.
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 | ||
| 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 | ||
| 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 | ||
| 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 |
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 26RCA?
The Kohler 26RCA is rated 24 kW standby (24.0 kVA).
Which engine powers the Kohler 26RCA?
The Kohler 26RCA is powered by the Kohler CH740 / CH1000 / CH1006 engine.
What kind of fuel does the Kohler 26RCA run on?
The Kohler 26RCA runs on LPG/Natural Gas.
How much oil does the Kohler 26RCA take?
The Kohler 26RCA has an engine oil capacity of 1.9 liters (2.0 US quarts), per the manufacturer specification sheet.
What is the sound level of the Kohler 26RCA?
The Kohler 26RCA is rated at 56.0 dBA at 7 m, per the manufacturer specification sheet.
How much does the Kohler 26RCA weigh?
The Kohler 26RCA has a dry weight of 283 kg (623 lb).
What voltage does the Kohler 26RCA produce?
The Kohler 26RCA is offered in 120/240 V, 1-phase.
What size battery does the Kohler 26RCA need?
The Kohler 26RCA uses 1 battery, 12 V each, 500 CCA, group 51, per the manufacturer specification sheet. The starting system is 12 V DC.
What alternator comes on the Kohler 26RCA?
The Kohler 26RCA uses a 2F8 alternator. It has 2 poles. Insulation class H.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Controller display backlight is off | Backlight turns off after about 1 minute with no activity | Backlight will turn on when a button is pressed or the generator set starts |
| Controller display is off | Low or no battery voltage | Check connections; Check generator set battery. See the Service Views section |
| The generator set does not crank | Battery weak or dead | Recharge or replace the battery. Make sure that the AC power to the generator set controller is backed up by the generator set |
| The generator set does not crank | Battery connections reversed or poor | Check the connections |
| The generator set does not crank | Emergency stop switch activated | Verify that it is safe to start the engine and apply load. Then reset the stop switch or engine shutdown switch |
| The generator set does not crank | Fault shutdown | Check the controller display for fault messages. Correct the fault condition and reset the controller |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Kohler 26RCA troubleshooting guide (50 entries) →
Repair guides
17- Access the Air Intake Area
- Air Cleaner Service, 14 kW Models
- Air Cleaner Service, 20/26 kW Models
- Checking the Fuel Pressure at the Regulator
- Checking the OnCue Plus Network Connection
- Field Connections
- Fuel Conversion from NG to LPG, 14RCA/L (Original Fuel System)
- Fuel Selection, Revised Fuel System
- Fuel Selection, Revised Fuel System, 14/20/26RCA/L
- Generator Reconnection (12-Lead Three-Phase)
- Governor System Operation Test
- Lifting the Generator Set
- Reset the Thermostat
- Resetting the Maintenance Timer
- Resetting the Thermostat
- Test Low Oil Pressure (LOP) Switch
- Voltage Calibration Using RDC2 Keypad
Step-by-step procedures compiled from the Kohler service manual for this model.
Parts
12| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 24 590 01-A | Oil Cooler, 14RCA/L | Oil cooler | buy | |
| 62 132 04-S | Spark plug | 2 | Spark plug | Amazon |
| 62 132 13-S | Spark plug XC10YC with 0.015 in. gap (26 kW, superseded) | Spark plug | buy | |
| GM101737 | Lifting bars | 4 | Lifting bar | Amazon eBay |
| GM119128 | Maintenance Kit 26RCA, 10W-50 Oil | 1 | Maintenance kit | Amazon eBay |
| GM119129 | Maintenance Kit 26RCA, 5W-30 Oil | 1 | Maintenance kit | Amazon eBay |
| 259391 | Relay | 1 | Service part / kit | Amazon eBay $53.76 |
| 62 590 01 | Oil Cooler, 20RCA/L | Service part / kit | buy | |
| GM119028-KP1-QS | Battery heater kit | Service part / kit | eBay | |
| GM57969-KP3-QS | Carburetor heater kit | 1 | Service part / kit | Amazon eBay |
| GM57969-KP5-QS | Carburetor heater kit | 1 | Service part / kit | Amazon eBay $104.99 |
| GM92001-KP1-QS | Dimension Print, Load Management Module | 1 | Service part / kit | Amazon eBay $99.99 |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Standby | 25% | 14.76 | 3.9 |
| Standby | 50% | 19.31 | 5.1 |
| Standby | 75% | 25.36 | 6.7 |
| Standby | 100% | 31.04 | 8.2 |
Available documents
Spec sheet (Kohler)Spec sheet — g4315 (Kohler)Operator's manual (Kohler)Reference — g6130 (Kohler)Parts manual — tp7091 (Kohler)Service manual (Kohler)Service manual — 14-20-26-rca-rcal-service-manual (Kohler)Service manual — PDF-tp7092 (Kohler)Service manual — adv9919 (Kohler)Service manual — kohler-power-systems-26rca-qs200-installation-sheet (Kohler)
This page was generated from the 10 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.