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Kohler CH1006 Engine

The Kohler CH1006 is a 1 L 2-cylinder natural engine rated at 3600 rpm, producing up to 26.1 kW. It powers generator sets from Kohler, including the 26RCA. It holds 1.9 L (0.5 gal) of oil.

Also known as: Kohler CH1006

0.999 L

Displacement

Cylinders

3600 rpm

Rated speed

26 kW

Gross power

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

Engine specifications

Oil capacity	1.9 L
Displacement	0.999 L
Cylinders	2
Aspiration	Natural
Rated speed	3600 rpm
Gross power	26 kW

Generator sets powered by this engine

Kohler 26RCA

How to read your Kohler engine serial & model number →

Common problems

This generator has absorbed more than 25% reactive power (magnetic excitation current) for 20 seconds. LossOfField
Cause: Generator voltage on this generator is not calibrated correctly. Generator voltage on other generator is not calibrated correctly. Bus voltage on this generator is not calibrated correctly. Bus voltage on the other generator is not calibrated correctly.
This generator does not know if the metering is connected or the orientation of the connection. This means that the generators can’t share load accurately until this information is known. MeterUnknown
Cause: System commissioning and startup not yet complete. See the APM instructions.
The two generators that are intended to be paralleled have incompatible model numbers. CfgModelNum
Cause: 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).
The system voltage of the two generators intended to be paralleled is not the same. CfgSysVolt
Cause: One of the two generators is incorrectly configured. Intermittent connections on RBUS network wiring.
The primary controller has lost communication with the secondary controller. (A secondary controller was detected, then communication was lost.) LossOfComm2
Cause: RBUS disconnected, secondary controller battery disconnected, updating firmware in secondary controller, or intermittent RBUS connections.
The power metering on this controller gives a signal that is not consistent with the system configuration. Reversing the power direction does not resolve the problem. ErraticSig
Cause: Bad wiring to the CT. Too much tension on wires from the CT to the controller.
The generator has verified that the metering is connected correctly and that the direction is consistent with expected power direction. MeteringOk
Cause: Status message indicates that the CT is connected to the generator correctly.
The generator has been attempting to synchronize for over 2 minutes without success. SyncFailure
Cause: Generator is hunting. Advanced speed control settings need adjustment. Load is changing frequently to disturb the online generator.
The generator has applied load (using the other generator) and has observed no current on the power sensing inputs. NoCurrent
Cause: The CT is not connected to the controller. The output leads from the generator do not go through the CT in the correct direction. See the APM instructions.
The bus is measured to be live when no generators are connected to it (both contactors open). BusLiveDead
Cause: Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly.
The bus is measured to be dead when one of the generators is supposed to be supplying voltage to the bus (closed contactor). BusDeadLive
Cause: Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly.
The Automatic Paralleling Module has stopped communicating on RBUS. (An APM was detected on the RBUS network but is no longer communicating). LossOfComAPM
Cause: APM is unplugged. Primary controller is powered down. Check the battery connections. See previous page for more information. Intermittent connections on RBUS network wiring.
Successful auto-discovery of APM connections. ContactorOk
Cause: Auto-discovery was activated by placing other generator in OFF and this generator in RUN.
Short circuits can cause bodily injury and/or equipment damage.
Fix: Disconnect the battery before generator set installation or maintenance. Remove all jewelry before servicing the equipment. Use tools with insulated handles. Remove the negative (–) lead first when disconnecting the battery. Reconnect the negative (–) lead last when reconnecting the battery. Never connect the negative (–) battery cable to the positive (+) connection terminal of the starter solenoid. Do not test the battery condition by shorting the terminals together.
Failure to Auto-Discover APM connections. ConCheckFail
Cause: Wires 9A and 9B crossed between the generators. Wires 9A or 9B not connected.

Compiled from service & troubleshooting documentation across every generator set that uses the Kohler CH1006.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Oil filter	Cartridge type		—

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

Service intervals

Item	Action	Hours	Months	Notes
Oil level (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

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.)
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	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	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

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

Fault codes

Code	Name	Meaning	Severity	Action
AC Sens Loss	AC Sens Loss	AC sensing lost in Auto mode; generator output AC sensing lost. Detection begins 10 seconds after crank disconnect. Warning after 1 sec if no output detected after crank disconnect; Shutdown after 3 sec if voltage was present and then lost.	Warning	Contact an authorized dealer for service.
AC Sens Loss Shutdown	Loss of AC sensing shutdown	Less than 5% of rated voltage measured on Phase A for 3 seconds in AUTO	Shutdown	Check loose wiring and connections; check all AC leads; troubleshoot alternator
AC Sens Loss 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
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.
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.
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 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 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 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 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
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.
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

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.

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.

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.

Generator Reconnection (12-Lead Three-Phase) installation

⚠ Do not change frequency (60 Hz to 50 Hz) in the field.

Tools: Digital multimeter (DVM)

Press OFF on RDC2 controller.
Disconnect engine starting battery, negative lead first.
Disconnect utility power to generator set.
Remove circuit breaker cover and controller panel for alternator leads and CTs.
Replace circuit breaker with correct part for new voltage rating.
Select desired voltage connection and connect leads per diagram.
Reconnect starting battery, negative lead last.
Check system voltage, frequency, phase settings in Controller Setup.

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

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

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 is the oil capacity of the Kohler CH1006?

The Kohler CH1006 engine has an oil capacity of 1.9 liters.

What is the displacement of the Kohler CH1006?

The Kohler CH1006 has a displacement of 0.999 liters with 2 cylinders.

Which generators use the Kohler CH1006 engine?

The Kohler CH1006 powers 1 generator set(s), including Kohler 26RCA.

What is a common problem with the Kohler CH1006 engine?

A commonly reported issue on generators using the Kohler CH1006 is: This generator has absorbed more than 25% reactive power (magnetic excitation current) for 20 seconds.. Cause: Generator voltage on this generator is not calibrated correctly. Generator voltage on other generator is not calibrated correctly. Bus voltage on this generator is not calibrated correctly. Bus voltage on the other generator is not calibrated correctly..