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, 120/208 V, 277/480 V |
| Phase | 1/3 |
| 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 |
| Dimensions (L×W×H) | 1193×660×820 mm |
| Dry weight | 283 kg |
| Sound level | 67.0 dBA @ 7 m |
Maintenance & consumables
for the Kohler CH1006| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Oil filter | Cartridge type | — |
Service intervals
20| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| 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 models | Check | 24 hr | ||
| Brushes and collector ring | Inspect | 300 hr | 12 mo | Authorized dealer only; Yearly or 300 hours |
| 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 | Not necessary for maintenance-free batteries; Yearly | |
| Battery terminals and boots | Clean | 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 | |
| Interior of sound enclosure | Clean | 3 mo | Quarterly | |
| Remote control system, if equipped | Test | 1 mo | Monthly | |
| 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 | |
| Wiring visible wear or damage | Inspect | 3 mo | Quarterly |
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
17| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Spark plug gap | 0.76 | mm (0.030 in.) | |
| 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.) | |
| 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% | % | |
| Temperature | Thermostat off temperature | 27 | C (80 F) | |
| Temperature | Thermostat on temperature | 16 | C (60 F) | |
| Torque | Spark plug | 24.4-29.8 | Nm (18-22 ft. lb.) | |
| Voltage | Battery charger output | 13.4 ±2% | VDC, max 2.5 A | |
| 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-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 | 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 |
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
24| 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. |
| 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 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. |
| 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. |
| 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. |
| 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 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. |
| 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 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. |
| 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 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. |
| Lo Crank Vlt | Low Cranking Voltage | Battery voltage dropped below 3.5 VDC during engine cranking. | Warning | Charge or replace the 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. |
| 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. |
| 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. |
| 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. |
| Spd Sens Flt | Speed Sensor Fault | Engine speed sensor has failed or engine stalled. | Shutdown | Contact an authorized dealer for service. |
| 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
12Resetting 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
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.
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.
Fuel Selection, Revised Fuel System, 14/20/26RCA/L installation
⚠ Explosive fuel vapors can cause severe injury or death
Tools: gas leak detector
- Press OFF button on generator set controller.
- Disconnect utility power to the generator set.
- Disconnect engine starting battery, negative lead first.
- Turn off the fuel supply.
- For NG, turn selection knob clockwise to UP arrow; for LPG, turn counterclockwise about 1/4 turn.
- For NG, connect ignition timing lead 65 to N3; for LPG, disconnect lead 65 from N3.
- Connect and turn on fuel supply, ensuring it matches the fuel setting.
- Reconnect battery leads, negative lead last.
- Reconnect utility power to the generator.
- Change fuel type setting on RDC2 controller in Genset System menu.
- Start generator by pressing RUN button.
- Check for leaks using a gas leak detector.
- Run generator and check operation; press OFF when done.
Air Cleaner Service, 14 kW Models maintenance
⚠ Do not operate generator set with air cleaner removed
- Press OFF on controller
- Disconnect utility power
- Disconnect battery negative lead first
- Loosen cover retaining knob and remove cover
- Remove element cover nut, element cover, and paper element
- Replace element if dirty, bent, or damaged (do not wash or use pressurized air)
- Check air cleaner base and element cover, replace damaged components
- Reinstall element, cover, nut, and cover; secure with knob
- Reconnect utility power and battery negative last
Air Cleaner Service, 20/26 kW Models maintenance
⚠ Do not operate generator set with air cleaner removed
- Loosen two cover retaining knobs and remove cover
- Remove paper element
- Replace if dirty, bent, or damaged (do not wash or use pressurized air)
- Check air cleaner base, secure and undamaged
- Reinstall element flat and properly seated
- Install cover and secure with two knobs
Oil Change Procedure maintenance
⚠ Disconnect battery cables before working on generator set, negative lead first
⚠ Do not work on generator set until it cools
Tools: oil filter wrench
- Press OFF on controller
- Disconnect utility power
- Disconnect battery negative lead first
- Remove end panels to access oil drain valve/hose
- Clean area around dipstick and oil fill cap
- Remove drain hose cap and lower into container
- Open oil drain valve
- Remove dipstick and fill cap, drain completely
- Close drain valve, replace hose cap and clip, replace dipstick
- Loosen and remove old oil filter, allow to drain (20/26 kW)
- Clean gasket sealing surface, oil new filter seal, install new filter
- Fill with oil to F mark on dipstick
- Reconnect battery negative last, reconnect utility power
- Press RUN, run briefly, recheck oil level, check for leaks
- Reset the maintenance timer on the controller
Resetting the Maintenance Timer maintenance
- From Overview menu, step down to Genset Run Time menu
- Press Select, step down to Next Maintenance screen
- Press Select
- Press Up arrow so 'Reset Maint Timer? Yes' is displayed
- Press Select; new interval and date displayed after ~2 minutes
Spark Plug Service maintenance
⚠ Disconnect battery cables before working on generator set
Tools: wire feeler gauge, spark plug socket/torque wrench
- Clean area around spark plug base
- Remove spark plug and check condition, replace if worn
- Check gap with wire feeler gauge, adjust by bending ground electrode
- Reinstall spark plug, torque to 24.4-29.8 Nm (18-22 ft. lb.)
Storage Procedure maintenance
⚠ Perform battery storage last
- Operate generator set to operating temperature (~15 min), then stop
- Drain warm engine oil, refill crankcase, run briefly to distribute, stop
- Start generator set, shut off gas supply, run until engine stops, press OFF
- Remove spark plugs, pour one tablespoon of oil into each hole, install plugs, ground leads (do not connect), crank 2-3 revolutions
- Clean exterior, seal openings with nonabsorbent tape, mask electrical contacts, oil unpainted metal surfaces
- Press OFF, disconnect battery negative first, clean battery, store in warm dry location, connect to float/equalize or trickle charger monthly
Resetting the Thermostat repair
⚠ Do not work on the generator set until it cools
- Disconnect utility power by opening the building distribution panel breaker
- Open enclosure roof and secure with roof stay
- Remove air intake panel
- Press button on thermostat to reset
- Replace air intake panel
- Reconnect utility power
- Reset fault on controller
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 |
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 CH1006 engine.
What kind of fuel does the Kohler 26RCA run on?
The Kohler 26RCA runs on LPG/Natural Gas.
What is the oil capacity of the Kohler 26RCA?
The Kohler CH1006 engine in the Kohler 26RCA has an oil capacity of 1.9 liters.
What alternator comes on the Kohler 26RCA?
The Kohler 26RCA uses a 2F8 alternator. It has 2 poles. Insulation class H.
Troubleshooting
6Fault codes
| Code | Meaning | Cause |
|---|---|---|
| BusDeadLive | The bus is measured to be dead when one of the generators is supposed to be supplying voltage to the bus (closed contactor). | Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly. |
| BusLiveDead | The bus is measured to be live when no generators are connected to it (both contactors open). | Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly. |
| CfgModelNum | The two generators that are intended to be paralleled have incompatible model numbers. | Incorrect configuration of one of the generators. Different generator types. The paralleled generator sets must be the same kW model. (i.e. two 14 kW or two 20 kWor 26 kW models). |
| CfgSysVolt | The system voltage of the two generators intended to be paralleled is not the same. | One of the two generators is incorrectly configured. Intermittent connections on RBUS network wiring. |
| ConCheckFail | Failure to Auto-Discover APM connections. | Wires 9A and 9B crossed between the generators. Wires 9A or 9B not connected. |
| ConNotDeterm | APM connection auto-discovery is not complete. This means that the generator does not know which contactor is connected to it. | Generators not yet started in RUN with other generator in OFF. See the APM instruction sheet for instructions to perform the auto-discovery procedure. |
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 (18 entries) →
Repair guides
2Step-by-step procedures compiled from the Kohler service manual for this model.
Parts
2| Part # | Description | Qty | System | |
|---|---|---|---|---|
| GM119128 | Maintenance Kit 26RCA, 10W-50 Oil | 1 | Maintenance kit | Amazon eBay |
| GM119129 | Maintenance Kit 26RCA, 5W-30 Oil | 1 | Maintenance 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.
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)