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Kohler 30RES Generator Set

The Kohler 30RES is a 30 kW (30 kVA) LPG/NG standby generator set powered by a General Motors OHC engine. It is available at 120/240 V, single-phase, 60 Hz and rated 125 A. It holds about 3.5 L (0.9 gal) of oil and 11.5 L (3.0 gal) of coolant, with a maximum ambient rating of 40 °C. Starting uses battery rated 525 CCA at 12 V. The set measures 73×36×37 mm (2.9×1.4×1.5 in), weighs about 490 kg (1080 lb) and produces 68 dBA at 23 m.

30 kW
Standby
1.6 L
Displacement
3.5 L
Oil capacity
5
Document types

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Service parts for the 30RES

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

Air intake

1 required

Oil system

1 required

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

Specifications

FuelLPG/NG
Frequency60.0 Hz
Standby power30 kW
Standby kVA30
ControllerADC 2100, ADC 2100 Digital
Oil capacity3.5 L
Alternator2F7 (2-pole, Class Class H insulation)
Voltage options120/240 V
Phase1
Rated current125 A
Power factor1.0
Battery cranking525 CCA
Battery voltage12 V
Coolant capacity11.5 L
Engine jacket water3.3 L
Max ambient40 °C
Dimensions (L×W×H)73×36×37 mm
Dry weight490 kg
Sound level68.0 dBA @ 23 ft m

Engine

General Motors OHC
Displacement1.6 L
Rated speed3600 rpm

Maintenance & consumables

for the General Motors OHC
ItemSpecCapacityPart #Interval
Air filterElement, air cleaner×1GM16944 Amazon eBay $49.68 NAPA $41.18
Fuel filter—
Oil filterCartridge×1GM28351 Amazon eBay $19.46 NAPA $9.09
Battery525 CCA, 12 V DC—
Belt12.7 mm (0.5 in.) depression—
Coolant11.5 L—800 hr
Oil3.5 L—200 hr
Spark plug—800 hr

Fault codes

16
CodeNameMeaningSeverityAction
AFAuxiliary faultFMI 2, SPN 0x02BD
CCCrank cycle
CO-3Fault displayed if the CO parameter is set incorrectlyShutdown
CO-6Fault displayed if the CO parameter is set incorrectlyShutdown
HBHigh battery voltageFMI 0, SPN 0x00A8
HEHigh engine tempFMI 0, SPN 0x006E
LBLow battery voltageFMI 1, SPN 0x00A8
LCLLow coolant levelFMI 1, SPN 0x006F
LOCLoss of coolantFMI 1, SPN 0x006F
LOPLow oil pressureFMI 1, SPN 0x0064
OCOvercrankFMI 0, SPN 0x068B
OFOverfrequencyFMI 0, SPN 0x0984
OSOverspeedFMI 0, SPN 0x00BE
OUOvervoltageFMI 0, SPN 0x0988
UFUnderfrequencyFMI 1, SPN 0x0984
UUUndervoltageFMI 1, SPN 0x0988

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

Procedures

12
ADC-RES Controller Configuration (Cn setting) adjustment

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

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

⚠ Be sure to save the new settings immediately before exiting the configuration mode; changes are lost if the controller times out (about 1 minute).

  1. Hold the Select button and move the master switch to RUN to enter configuration mode.
  2. Press the down arrow key then the up arrow key 3 times to enter configuration mode (password).
  3. Set the voltage/frequency parameter Uu for the model.
  4. Set the unit configuration parameter Uc (marine, standby, mobile).
  5. Set the engine type parameter Ec.
  6. Press the up arrow at the Adnc display to enter advanced configuration mode.
  7. Set the engine data input type Ed.
  8. Set the battery voltage Bt (12 or 24 VDC).
  9. Set the communications parameter Cn.
  10. Enter save mode and save your settings before exiting.
Output Voltage and Frequency Adjustment adjustment

⚠ The generator set must be running during these adjustments.

⚠ The engine speed (frequency) adjustment menus are not accessible on models with mechanical governors.

Tools: multimeter

  1. Move the master switch to RUN; the engine starts and runtime hours display.
  2. Hold the Select button about 5 seconds until the program version number displays.
  3. Press the down arrow key then the up arrow key 3 times to enter adjustment mode.
  4. 1P: adjust voltage coarse in large increments (approximately 5-7 volts per step).
  5. 2P: adjust voltage fine in smaller increments (approximately 0.5-0.7 volts per step).
  6. Adjust voltage stability (gain) coarse and fine.
  7. 3P: set volts/Hz (00=low, 09=high).
  8. 4P: adjust engine governor speed coarse and fine.
  9. 5P: adjust engine governor stability (gain) coarse and fine.
  10. Enter SAVE mode and save settings before exiting the adjustment mode.
Network Bridge Diagnostics diagnostic
  1. Check the network LEDs on the RJ45 connector for Ethernet network communication.
  2. Check the STAT LED; if not lit, check connections and the engine starting battery.
  3. Check the TX and RX LEDs for CAN data transmission and reception.
  4. If neither the TX nor the RX LED flashes, check bridge power, connections, and settings.
  5. If only one of the TX or RX LEDs flashes, check the connected devices on the generator set (CAN) side.
15/30RES and 15/30RYG Bridge Installation (GM62630-KP2) installation
  1. Remove the junction box panel to gain access to the inside of the junction box.
  2. Drill two 4.8 mm (3/16 in.) mounting holes in the top of the junction box.
  3. Install network bridge GM58703 inside the junction box using two screws M7985A-0410-20, washers M125A-04-80, and nuts M934-04-50.
  4. Proceed to Section 6, Network Bridge Connection.
15/30RESA and 15/30REYG Bridge Installation (GM62630-KP4) installation
  1. Remove the junction box panel to gain access to the inside of the junction box.
  2. Drill two 4.8 mm (3/16 in.) mounting holes in the top of the junction box.
  3. Install network bridge GM58703 inside the junction box using two screws M7985A-0410-20, washers M125A-04-80, and nuts M934-04-50.
  4. Proceed to Section 6, Network Bridge Connection.
17/18RES Bridge Installation (GM62630-KP1) installation
  1. Open the enclosure and remove the front panel to access the controller junction box. Cover internal components.
  2. Drill a hole for the customer-supplied Ethernet cable at the location shown.
  3. Drill a 38.1 mm (1.5 in.) hole in the bottom of the junction box. Insert bushing X-634-28.
  4. Route connector P21 of Y-harness GM62626 through this opening.
  5. Drill two 4.8 mm (3/16 in.) mounting holes in the front panel at the locations shown.
  6. Use two screws M7985A-04010-20, washers X-6278-8, and nuts M934-04-50 to mount network bridge GM58703.
  7. Proceed to Section 6, Network Bridge Connection.
8.5/12RES Bridge Installation (GM62630-KP3) installation
  1. Remove existing junction box panel GM60625. Save the hardware and seal for reuse.
  2. Mount network bridge GM58703 onto the new panel using two screws X-51-15, washers M125A-04-80, and nuts M934-04-50.
  3. Install new J-box panel GM66795 as shown. Use the existing hardware and seal X-6422-31.
  4. Affix decal GM54820 in the location shown.
  5. Proceed to Section 6, Network Bridge Connection.
Assign Bridge IP Address installation

Tools: DeviceInstaller software

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

⚠ Disconnect the battery cables before working on the generator set; remove the negative lead first and reconnect it last.

Tools: multimeter, personal computer with Program Loader Software

  1. Record generator set information required for configuration: model, market, voltage, frequency, phases, battery voltage.
  2. Place the generator set master switch in the OFF position.
  3. Disconnect power to the battery charger, if equipped.
  4. Disconnect the engine starting battery(ies), negative lead first.
  5. Open the junction box; disconnect the controller at P1, J15, and J16.
  6. Models ECD/EFCD, EGD/EFGD, EGZD only: disconnect the CO sensor harness at the 4-pin connector.
  7. Remove four controller mounting screws and remove the old controller.
  8. ECD/EFCD, EGD/EFGD, EGZD only: install CO sensor module assembly GM46362 on the back of the new controller GM47982.
  9. Install the new controller and secure with the mounting screws.
  10. Reconnect the P1, J15, and J16 connectors; connect the CO sensor harness on applicable models.
  11. Models 10/13/15EG, 10/13/15ERG, 15/30RES, 15/30RYG with S/N before 2053692: cut a 1-in. section of the gray/orange lead entering pin 9 at the ECM connector.
  12. Check that the generator set master switch is in the OFF position.
  13. Reconnect the engine starting battery, negative lead last.
  14. Reconnect power to the battery charger, if equipped.
  15. Check the controller application software version and load the latest application code if necessary.
DeviceInstaller Software Installation Procedure installation

Tools: OnCue software CD-ROM

  1. Insert the OnCue software CD-ROM into your PC's CD drive and wait for the opening window.
  2. Click on DeviceInstaller Software. A new window will open.
  3. Click on the Installer.msi file. The DeviceInstaller Setup Wizard will start.
  4. Read the information on the screen and click Next.
  5. Choose the installation directory, normally C:\Program Files. Click Next.
  6. Choose Everyone or Just me for multiple PC users. Click Next.
  7. Continue to follow the on-screen instructions to install DeviceInstaller software.
Installation Procedure installation

⚠ Accidental starting can cause severe injury or death. Disconnect the battery cables, negative lead first.

⚠ Hazardous voltage. Disconnect all power sources before opening the enclosure.

  1. Place the generator set master switch in the OFF position.
  2. Disconnect the power to the battery charger, if equipped.
  3. Disconnect the generator set engine starting battery(ies), negative lead first.
  4. Determine whether the network bridge will be mounted inside the enclosure or in a remote location.
  5. For a remote location, find a protected location; do not install the bridge outdoors.
  6. Maximum cable length between the network bridge and the controller is 36.6 m (120 ft.).
  7. Proceed to the bridge mounting instructions for your generator set model (Figure 8).

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

VoltagePhaseConnectionLeadsNotes
100 VAC11Ph, 2WUu00; 60 Hz
100 VAC11Ph, 3WUu00; 60 Hz
100/200 VAC11Ph, 3WUu08; 60 Hz
110 VAC11Ph, 2WUu05; 50 Hz
110 VAC11Ph, 3WUu05; 50 Hz
110/190 VAC3WyeUu17; 50 Hz
110/220 VAC11Ph, 3WUu07; 50 Hz
110/220 VAC1DoglegUu07; 50 Hz
110/220 VAC3DeltaUu15; 50 Hz
115 VAC11Ph, 2WUu05; 50 Hz
115/200 VAC3WyeUu23; 50 Hz
115/230 VAC11Ph, 3WUu02; 50 Hz
115/230 VAC1DoglegUu06; 50 Hz
115/230 VAC3DeltaUu14; 50 Hz
120 VAC11Ph, 2WUu00; 60 Hz
120 VAC11Ph, 3WUu00; 60 Hz
120/208 VAC3WyeUu11; 60 Hz
120/240 VAC11Ph, 3WUu01; 60 Hz
120/240 VAC1DoglegUu01; 60 Hz
120/240 VAC3DeltaUu10; 60 Hz
127/220 VAC3WyeUu16; 60 Hz
139/240 VAC3WyeUu10; 60 Hz
220 VAC11Ph, 2WUu12; 50 Hz
220/380 VAC3WyeUu19; 60 Hz
230 VAC11Ph, 2WUu02; 50 Hz
230/400 VAC3WyeUu03; 50 Hz
240 VAC11Ph, 2WUu13; 50 Hz
240/416 VAC3WyeUu20; 60 Hz
277/480 VAC3WyeUu04; 60 Hz

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

Common questions

How many kW is the Kohler 30RES?

The Kohler 30RES is rated 30 kW standby (30.0 kVA).

What engine does the Kohler 30RES use?

The Kohler 30RES is powered by the General Motors OHC engine.

What kind of fuel does the Kohler 30RES run on?

The Kohler 30RES runs on LPG/NG.

What is the cooling system capacity of the Kohler 30RES?

The Kohler 30RES cooling system holds 11.5 liters (3.0 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the oil capacity of the Kohler 30RES?

The Kohler 30RES has an engine oil capacity of 3.5 liters (3.7 US quarts), per the manufacturer specification sheet.

What is the sound level of the Kohler 30RES?

The Kohler 30RES is rated at 68.0 dBA at 23 ft m, per the manufacturer specification sheet.

How much does the Kohler 30RES weigh?

The Kohler 30RES has a dry weight of 490 kg (1080 lb).

What voltages is the Kohler 30RES available in?

The Kohler 30RES is offered in 120/240 V, 1-phase.

What size battery does the Kohler 30RES need?

The Kohler 30RES uses 12 V each, 525 CCA, per the manufacturer specification sheet.

What alternator does the Kohler 30RES use?

The Kohler 30RES uses a 2F7 alternator. It has 2 poles. Insulation class Class H.

What oil filter fits the Kohler 30RES?

The Kohler 30RES uses oil filter part number GM28351.

What air filter fits the Kohler 30RES?

The Kohler 30RES uses air filter part number GM16944.

Troubleshooting

47

Fault codes

CodeMeaningRemedy
HBHigh battery voltage warning — fault code is displayed if the engine starting battery voltage rises above 16 VDC for a 12 VDC system or above 30 VDC for a 24 VDC system for more than 10 seconds when the engine is not running; this fault condition does not inhibit engine starting; the fault condition clears when the battery voltage returns to a voltage within the limits for more than 10 secondsCheck the battery rating and condition.
LBLow battery voltage warning — fault code is displayed if the engine starting battery voltage falls below 9.5 VDC for a 12 VDC system or below 16 VDC for a 24 VDC system for more than 10 seconds when the engine is not running; this fault condition does not inhibit engine starting; the fault condition clears when the battery voltage returns to a voltage within the limits for more than 10 secondsCheck the battery rating and condition; charge or replace the battery.
AFAuxiliary fault input shutdown — input from a customer-supplied switch that closes when the fault is active; the generator set shuts down 0.3 seconds after the fault is detected and will not start when the fault is active (input is grounded); this protection becomes active 3 seconds after crank disconnectCheck the cause of the auxiliary fault.
HEHigh engine temperature shutdown — shutdown occurs if the engine coolant temperature exceeds the maximum temperature for more than 5 seconds; this protective becomes active after the engine reaches the crank disconnect speedCheck for blocked air inlets and exhaust outlets.
LCLLow coolant level — not used
LOCLoss of coolant — not used
LOPLow oil pressure shutdown — shutdown occurs if a low oil pressure condition exists for more than 5 seconds; this protective becomes active 30 seconds after the engine has reached crank disconnect speed (30 second inhibit)Check for leaks in the lubrication system; check the oil level and add oil if the level is low.
OCOvercrank 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 if no engine rotation is sensed during cranking; shuts down 1 second after the fault is detectedCheck the fuel supply, spark plug, and battery; check for loose connections; contact an authorized Kohler distributor/dealer for service if problem continues.
OFOverfrequency shutdown — shutdown occurs when the governed frequency exceeds 110% of the system's frequency setpoint for more than 5 seconds; this protective becomes active 10 seconds after engine start (10 second inhibit)Contact an authorized Kohler distributor/dealer for service if problem continues.
OSOverspeed shutdown — shutdown occurs if the engine speed exceeds 115% of the normal running speed for more than 0.3 secondsContact an authorized Kohler distributor/dealer for service if problem continues.
OUOvervoltage shutdown — shutdown occurs if the voltage exceeds 120% of the system nominal voltage for more than 2 secondsContact an authorized Kohler distributor/dealer for service if problem continues.
UFUnderfrequency shutdown — shutdown occurs when the governed frequency falls below 90% of the nominal system frequency for more than 5 seconds or below 59 Hz for more than 60 seconds; this protective becomes active 10 seconds after engine start (10 second inhibit)Reduce the load and restart the generator set; contact an authorized Kohler distributor/dealer for service if problem continues.
UUUndervoltage shutdown — shutdown occurs if the voltage falls below 80% of the nominal system voltage for more than 10 secondsReduce the load and restart the generator set; contact an authorized Kohler distributor/dealer for service if problem continues.
SCF0Software Communication Fault 0 — indicates a software or communication problem within the ADC 2100Replace the controller.

Symptoms & remedies

SymptomCauseRemedy
The generator set does not crankBattery weak or deadRecharge or replace the battery.
The generator set does not crankBattery connections reversed or poorCheck the connections.
The generator set does not crankController fuse (F3) blownReplace the fuse. Contact an authorized Kohler distributor/dealer for service if fuse blows repeatedly.
The generator set does not crankRelay interface board fuse (F2) blown; Engine fuses F4 or F6 blown
The generator set does not crankGenerator set master switch in the OFF positionMove the master switch to the RUN position.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallyAir cleaner cloggedClean and/or replace the air cleaner.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallyBattery weak or deadRecharge or replace the battery.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallyBattery connection poorClean and tighten the battery connections.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallySpark plug wire connection looseCheck the spark plug wires.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallyLow oil pressure shutdownCheck the oil level.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallyFuel pressure insufficientCheck the fuel supply and valves.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallyEngine fuse F4, F6, or F7 blownReplace the fuse. If the fuse blows again, contact an authorized Kohler distributor/dealer.
The generator set cranks but does not start, starts hard, lacks power, or operates erraticallyEngine malfunctionContact an authorized Kohler distributor/dealer.
No AC outputAC circuit breaker in the OFF positionPlace the circuit breaker in the ON position.
No AC outputAC circuit breaker tripping because of overloadReduce the load on the generator set.
No AC outputAC circuit breaker tripping because of short circuitContact an authorized Kohler distributor/dealer for service.
No AC outputAuxiliary winding fuse (F1) blownReplace the fuse. Contact an authorized Kohler distributor/dealer for service if fuse blows repeatedly.
No AC outputEngine fuses F6 or F7 blown
Low output or excessive drop in voltageGenerator set overloadedReduce the load.
Generator set stops suddenlyLow oil pressure shutdownCheck the oil level. Check for oil leaks.
Generator set stops suddenlyOut of fuelCheck fuel supply.
Generator set stops suddenlyOvercrank shutdownReset the controller. If the overcrank fault occurs again, contact an authorized Kohler distributor/dealer.
Generator set stops suddenlyController fuse (F3) blownReplace the fuse. If the fuse blows again, contact an authorized Kohler distributor/dealer.
Generator set stops suddenlyEngine fuse F6 or F7 blown
Generator set stops suddenlyAuxiliary winding fuse (F1) blownReplace the fuse. Contact an authorized Kohler distributor/dealer for service if fuse blows repeatedly.
Generator set stops suddenlyOverspeed shutdownReset the controller. If the overspeed fault occurs again, contact an authorized Kohler distributor/dealer.
Generator set stops suddenlyGenerator set master switch in the OFF/RESET positionMove the switch to the correct position (RUN or AUTO).
Generator set stops suddenlyRemote stop command received from a remote switch, remote digital gauge, or ATSCheck the remote switch position.
Generator set stops suddenlyEngine malfunctionContact an authorized Kohler distributor/dealer.
Controller LED display is offNo power to the controller: Controller powers down if the generator set has not run for 48 hours or longerController display will automatically activate when a remote start command is received or the generator set master switch is moved to the RUN position.
Controller LED display is offController fuse (F3) is blownReplace the fuse. See Figure 4-1. If the fuse blows again, contact an authorized Kohler distributor/dealer.
Controller LED display is offLow or no battery voltageCheck connections. Check generator set battery. See Figure 4-2.
Controller LED display is offGenerator set master switch is in the OFF/RESET positionMove generator set master switch to the AUTO or RUN position.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Parts

14
Part #DescriptionQtySystem
359422Washer, sealing (30.1 mm OD)1Seal Amazon eBay
364345Switch, assembly pressure1Sensor Amazon eBay
365499O-ring, ISO 6149 (11.3 mm ID)2Seal Amazon eBay
GM16944Element, air cleaner1Air filter Amazon eBay $49.68 NAPA $41.18
NGE012014Charge Air Cooler BoltsBolt Amazon eBay
X-386-109Fuel line, flexible1Hose Amazon eBay
X-422-15Fuel line, flexible1Hose Amazon eBay
X-422-35Fuel line, flexible1Hose Amazon eBay
X-422-38Line, flexible1Hose Amazon eBay
GM36247Exhaust pipe1Service part / kit Amazon eBay
GM58703Assy, J1939/ModBus/Ethernet Converter (network bridge)1Service part / kit eBay
GM62348Kit, Resi Maint (30RES) (4/cs)1Service part / kit eBay
GM66054Decal reminder to check oil level1Service part / kit Amazon eBay
GM66559Lead, oil pressure switch1Service 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

Spec sheet (Kohler)Spec sheet — Kohler 15RES (Kohler)Spec sheet — g4108 (Kohler)Reference (Kohler)Reference — TT1521 (Kohler)Owner's manual — tp6344 (Kohler)Owner's manual — tp6726 (Kohler)Parts manual (Kohler)Parts manual — g260412 (Kohler)Service manual — g260823 (Kohler)Service manual — sb703 (Kohler)Service manual — tp6437 (Kohler)Service manual — tp6725 (Kohler)Service manual — tt1364 (Kohler)Service manual — tt1486 (Kohler)Service manual — tt1499 Oil MakeupLow Level Shutdown (Kohler)Service manual — tt1549 (Kohler)

This page was generated from the 17 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Full service, cheapest listings

Priced items from this model's own parts manual.

Air filter GM16944$41.18
Oil filter GM28351$9.09
2 priced items$50.27