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Cummins/Onan GGHG Generator Set

The Cummins/Onan GGHG is a 85 kW (106 kVA) Natural gas/propane standby generator set powered by a Ford V-10 6.8L engine. It is available at 110/120 V and 240 V, single-phase, 60 Hz and rated 295 A. It holds about 6.2 L (1.6 gal) of oil and 33.1 L (8.7 gal) of coolant, with a maximum ambient rating of 40 °C. Starting uses 1 group-31 battery rated 1000 CCA at 12 V. The set measures 2662×1016×1397 mm (104.8×40.0×55.0 in), weighs about 1071 kg (2361 lb) and produces 72 dBA at 7 m.

85 kW
Standby
6.8 L
Displacement
6.2 L
Oil capacity
4
Document types

How to read your Cummins/Onan serial & model number →

Service parts for the GGHG

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

Belts

1 required

Electrical

1 required

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

Specifications

FuelNatural gas/propane
Frequency60.0 Hz
Standby power85 kW
Standby kVA106
Prime power85 kW
ControllerDetector, PCC2100, PowerCommand 2100, PowerCommand 2100 (PCC2100), PowerCommand PCC2100
Oil capacity6.2 L
AlternatorBrushless, 12-lead
Voltage options110/120 V, 240 V
Phase1
Rated current295 A
Power factor1.0
Circuit breaker400 A
Battery group31
Battery cranking1000 CCA
Battery voltage12 Volts DC V
Battery quantity1
Coolant capacity33.1 L
Max ambient40 °C
Dimensions (L×W×H)2662×1016×1397 mm
Dry weight1071 kg
Wet weight1111 kg
Sound level72.0 dBA @ 7 m

Engine

Ford V-10 6.8L
Oil capacity5.5 L
Displacement6.8 L
Rated speed1800 rpm

Maintenance & consumables

for the Ford V-10 6.8L
ItemSpecCapacityPart #Interval
Air filter—2000 hr
Fuel filter—
Oil filter—250 hr
Battery600 amps minimum at ambient temperature of 0 °C (32 °F)416-0823200 hr Amazon
BeltBelt, Serpentine - 6 Groove511-0161-21 Amazon eBay
Coolant—24 hr
Coolant filter—500 hr
OilFord specification WSS-M2C153-F and the recommended API performance category “SJ” or higher and SAE viscosity grade as shown in the equipment Owner’s or Operators Engine handbook.11.0 liters—300 hr
Spark plug—1000 hr

Service intervals

40
ItemActionHoursMonthsNotes
Air cleaner (normal duty filter)Check100 hrPerform more often in extremely dusty conditions; replace element after 500 hours.
All exhaust components and hardware (fittings, clamps, fasteners)Check8 hrDaily; audibly and visually with generator set running
All hardware (fittings, clamps, fasteners, etc.)Check100 hrDaily or after 8 hours.
Bedframe fluid containment (where fitted)Drain8 hrDaily; drain if necessary
Coolant heater(s)Check8 hrDaily.
Coolant levelCheck8 hrDaily.
Coolant level of radiator(s) (water jacket & LTA)Check8 hrDaily
Cooling fan bladesCheck8 hrVisual inspection required daily
Drive belt condition and tensionCheck8 hrVisually check belt for wear or slippage; replace if hard or brittle (Service Engineer)
Engine oil levelCheck8 hrDaily.
Fuel level in tankCheck8 hrDaily or after 8 hours
Fuel lines and hosesCheck8 hrDaily; check for oil, fuel, coolant and exhaust system leaks (Table 5 note 1)
General setInspect8 hrCheck for oil, fuel, cooling and exhaust system leaks; inspect exhaust audibly/visually with set running and repair leaks immediately.
General set inspectionInspect8 hrDaily. Check for oil, fuel, cooling and exhaust system leaks; check exhaust audibly and visually with set running.
Crankcase oilChange50 hrFirst service — Drain and replace crankcase oil after the first 50 hours of operation on new generator sets (break-in).
Engine oil and filterChange250 hr6 moFirst service — Replace after the initial running-in period of 50 hours; contact your authorized distributor (Table 5 note 5)
Engine oil and filterDrain50 hrFirst service — Break-in: drain and replace crankcase oil after first 50 hours of operation on new generator sets.
Air cleanerCheck100 hrMonthly; replace as necessary. Perform more often in extremely dusty conditions.
Battery electrolyte levelCheck100 hr1 moMonthly.
Engine oil and filter (normal duty filter)Change100 hr12 moPerform more often in extremely dusty conditions; perform at least once a year.
Generator air outletCheck100 hr1 moMonthly.
Governor linkageCheck100 hrPerform more often in extremely dusty conditions.
All hardware (fittings, clamps, fasteners)Check250 hr6 mo
Drive beltCheck250 hr6 moVisually check for wear or slippage; replace if hard or brittle.
Engine coolant port capsCheck250 hr6 moReplace after 4 years or 1000 hours.
Exterior of radiatorInspect250 hr6 moInspect for obstructions.
Radiator exteriorInspect250 hr6 moInspect for obstructions.
Radiator hosesCheck500 hr12 moCheck for wear and cracks; replace if hard or brittle.
Radiator hosesInspect250 hr6 moReplace if hard or brittle.
AC generator and controlsCheck500 hr12 moYearly.
Anti-freezeCheck500 hr12 moYearly.
Anti-freeze concentrationCheck500 hr12 moYearly or after 500 hours.
Catalytic converter restrictionTest500 hr12 moMust be performed by a qualified mechanic; replace every 8 years or 2000 hours.
Cooling systemsClean500 hr12 moYearly.
Oxygen sensorInspect500 hr12 moMust be performed by a qualified mechanic; replace every 1,500 hours (recommended).
RadiatorDrain1000 hr24 moDrain and flush.
Spark plugsInspect500 hr12 moReplace every 1,000 hours.
Cylinder headsOther1000 hr24 moOverhaul cylinder heads.
Alternator vibration levelsCheck3000 hrTable 6 (3000 hours)
Fuel injectorsCheck3000 hrTable 6 (3000 hours); to be undertaken by a Service Technician

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

Service specifications

60
TypeItemValueUnitCondition
ClearanceClearance around generator set for service1meter
ClearanceExhaust pipe clearance to combustible wall or partition305mm
ClearanceIsolator base elevation tolerance between isolators0.25inch (6 mm)
ClearanceVibration isolator top plate to base clearance0.25inch
ClearanceVibration isolator top plate-to-base clearance (nominal)0.25inch (6 mm)
GapSpark Plug Gap0.044in (1.1 mm)
GapSpark plug gap0.035in (0.9 mm)
GapSpark plug gap0.044 (1.1 mm)in (mm)
OtherAdjust - Frequency Adjust range5% of nominal frequency
OtherAdjust - Voltage Adjust range5% of nominal voltage
OtherAir cleaner bench/paper element cleaningNot recommendedCummins Inc. does not recommend cleaning paper-type air cleaner elements
OtherBattery charger output - 12 Volt15A
OtherBattery charger output - 24 Volt12A
OtherBattery electrolyte specific gravity (fully charged, corrected)1.260SGat 25 °C (77 °F)
OtherBattery specific gravity, charge required below1.215specific gravity
OtherBattery specific gravity, fully charged1.260corrected; add 0.004 per 10 F above 80 F (27 C)
OtherBattery specific gravity, fully charged (corrected)1.260specific gravitycorrected to 80°F (27°C)
OtherBattery specific gravity, recharge threshold1.215charge battery if reading is below this value
OtherBattery storage charging - further charge interval6monthsat the normal initial charge rate until voltage ceases to rise
OtherBoost Charge interval (if charger fitted with Boost switch)6monthsnormally around every six months per battery manufacturer
OtherCharge battery if specific gravity below1.215SG
OtherCooldown at idle timer0 - 30minutes
OtherLow Fuel warning (yellow lamp)5inches (127 mm) WC or lessdual or single fuel systems
OtherOutput voltage adjustment range (voltage adjust rheostat, optional)±5% of nominal voltage
OtherOvercrank timed cranking periodapproximately 75seconds, including two rest periods
OtherRated To Idle delay0 - 10secondsdefault = 0; Beginning Version 2.303
OtherSecondary regulator initial adjustment (distance from top of regulator to top of set screw), NG, 60 Hz12.1mm
OtherSecondary regulator initial adjustment, NG, 60 Hz13.35mm
OtherSecondary regulator initial adjustment, NG, 60 Hz15.9mm
OtherSpecific gravity temperature correction0.007SG per 10 °C (18 °F)subtract above 25 °C (77 °F), add below
OtherSpecific gravity, at end of charge, ambient frequently above 32 °C (90 °F)1.240 - 1.260SG
OtherSpecific gravity, at end of charge, ambient normally below 32 °C (90 °F)1.240SG
OtherSpecific gravity, electrolyte for filling new cells, ambient frequently above 32 °C (90 °F)1.270 - 1.290SG
OtherSpecific gravity, electrolyte for filling new cells, ambient normally below 32 °C (90 °F)1.270SG
OtherStart Delay0 - 300secondsdefault = 0
OtherStarting cycles (crank/rest)3start cyclesdefault: 3 cycles composed of 15 seconds of cranking and 15 seconds of rest
OtherStop Delay0 - 600secondsdefault = 0
OtherTime Delay To Stop0 - 600seconds
OtherWarm-up at idle time delay0 - 300seconds
PressureConcrete compressive strength for seismic anchors4000PSI
PressureExhaust Backpressure (Max. Allowed)25inch H2O (6.25 kPa)maximum
PressureExhaust backpressure (max allowed)20inch H2O (5.0 kPa)
PressureFuel inlet pressure (LPG liquid withdrawal)312psi (2,153 kPa)
PressureFuel inlet pressure maximum (LPG liquid withdrawal)312psi (2,153 kPa)liquid withdrawal
PressureFuel inlet pressure maximum (NG/LPG vapor withdrawal)13.6inch H2O (3.4 kPa)
PressureFuel inlet pressure minimum (NG/LPG)7.0inch H2O (1.7 kPa)
PressureGaseous fuel supply inlet pressure - maximum operating13.6in. water column (25.4 mmHg)
PressureGaseous fuel supply inlet pressure - minimum operating7.0in. water column (13.07 mmHg)
PressureLO FUEL lamp (fuel supply pressure marginally low)5 (127 mm) WC or lessinches WC
PressureLOP jumper alternate shutdown setting14psi (97 kPa)alternate jumper position (not recommended, see caution)
PressureLP gas pressure at full loadnegative 1.0inch WC (0.249 kPa)full load
PressureLP gas pressure at mixer, full load-1.0inch WC (0.249 kPa)full load
PressureLP gas pressure at mixer, no load-0.5inches WC (0.13 kPa)no load
PressureLP gas pressure at no loadnegative 0.5inches WC (0.13 kPa)no load
PressureLPG Liquid Withdrawal Fuel Flow Inlet Pressure Maximum312psi (2,153 kPa)maximum
PressureLPG gas pressure at mixer, full loadapproximately -1.0inches WC
PressureLPG gas pressure at mixer, no loadapproximately -0.5inches WC
PressureLow Oil Pressure shutdown (red lamp), LOP jumper set to 25 psiless than 25psi (173 kPa)
PressureLow fuel pressure alarm (engine control module)3 (76.2 mm) water columninches WCprimary fuel pressure falls below
PressureLow oil pressure shutdown25psi (172.4 kPa)~10 second time delay after starter disconnect

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

FluidGradeStandardAmbientCapacityNotes
Coolant50% Ethylene Glycol and waterFleetguard® Compleat ES low-silicate antifreeze, or equivalentStandard concentration 50% Ethylene Glycol and water; must be maintained. Fill cooling system to the bottom of the fill neck in the radiator or expansion tank. Some radiators have two fill necks, both must be filled.
Coolant50/50 coolant solution (50% pure water, 50% antifreeze); 65% antifreeze/35% water if below -37°F (-38°C)33.1 LCooling system capacity with standard radiator 8.8 Gal (33.1 L). Use clean, low-mineral soft water free of chloride, sulfate or acid. Do not use antifreeze containing anti-leak additives.
Coolant50/50 water/antifreeze (65% antifreeze/35% water below -37F/-38C); no anti-leak additivesabove -38°C8.8 Gal (33.1 L)Use soft water low in mineral content.
Coolant50/50 coolant solution (50% pure water and 50% antifreeze)Do not use antifreeze containing anti-leak additives; use soft, low-mineral waterabove -37°C33.1 LIf temperatures below -37 F (-38 C) are possible use 65% antifreeze and 35% water. Cooling system capacity with standard radiator 8.8 Gal (33.1 L).
Engine oilHigh-quality multi-viscosity lubricating oil such as Cummins Premium Blue® or its equivalentConsult your authorized distributor for correct lubricating oil specifications for your operating conditions. Special running-in oils are not recommended.
Engine oilRefer to oil viscosity chart (Figure 5-1)API SJ or SJ/CD6.2 LSelect grade right for the lowest ambient temperature expected.
Engine oilSAE 10W30, 5W30, 15W40API classification SJ, SH or SL6.2 LOil capacity with filters 6.5 Qts (6.2 L). Select viscosity grade for lowest expected temperature; if ambient is consistently below -13°F (-25°C), use a SAE 5W synthetic oil. Do not use oil that is too thick.
Engine oilAPI SJ, SH or SL; SAE 10W30, 5W30 or 15W40 per ambient temperature chartAPIabove -25°C6.5 Qts (6.2 L)Use SAE5W synthetic oil if ambient temperature is consistently below -13F (-25C).
Engine oilSAE 5W syntheticAPI SJ or SJ/CDabove -25°C6.2 LUse SAE 5W synthetic if ambient temperature is consistently below -13 F (-25 C). Pick viscosity grade for lowest temperature expected. Oil capacity with filters 6.5 Qts (6.2 L).
FuelNatural Gas and/or Propane (LPG, liquid or vapor withdrawal)Combination natural gas/LPG sets have separate shutoff solenoid valves and a fuel pressure switch for automatic changeover.
FuelNatural Gas and/or Propane (LPG, liquid or vapor)Gaseous fuel; engine has a gas mixer serving both fuels with separate shutoff solenoid valves and pressure switch for automatic changeover.

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

80
CodeNameMeaningSeverityAction
121Speed Signal LostCategory AShutdown
135Oil Pressure Sensor HCategory CWarning
141Oil Pressure Sensor LCategory CWarning
143Pre-Low Oil PresCategory DWarningIf generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow code 415 procedure.
144Coolant Sensor HighCategory CWarning
145Coolant Sensor LowCategory CWarning
146Pre-High Coolant TempCategory DWarningReduce load if possible by turning off non-critical loads; check air inlets/outlets for obstructions. If engine can be stopped, follow code 151 procedure.
151High Coolant TempCategory DShutdownAllow engine to cool. Check coolant level and leakage points, obstructions to cooling airflow, fan belt, blower fan/circulation pumps; reset control and restart.
197Low Coolant LevelCategory D (optional)WarningIf generator is powering critical loads and cannot be shut down, wait until next shutdown period, then follow code 235 procedure.
234OverspeedCategory AShutdown
235Low Coolant LevelCategory D (optional)ShutdownAllow engine to cool. Check coolant level and replenish, look for leakage points and repair; reset control and restart.
359Fail To StartCategory DShutdownOpen any closed fuel shutoff valve; check for dirty/plugged air filter and replace if necessary; check gaseous fuel delivery; reset control and restart.
415Low Oil PressureCategory DShutdownCheck oil level, lines and filters; replenish oil if low; reset control and restart.
441Low Bat VoltageCategory DWarningCheck/recharge/replace discharged or defective battery; clean and tighten battery cable terminals; check battery charger float level.
442High Bat VoltageCategory DWarningCheck float level on battery charger if applicable (lower float level).
1123Shutdown After BSCategory AShutdown
1124Delayed ShutdownCategory EWarning
1131Battle Sh ActiveCategory EWarning
1311Customer Input #1Category EProgrammable via InPower service tool: enable/disable, status (warning/shutdown/none), active open/closed, and display name.
1312Customer Input #2Category EProgrammable via InPower service tool: enable/disable, status (warning/shutdown/none), active open/closed, and display name.
1313-1316Network Fault 1 thru 4Category E
1317Customer Input #3Category EProgrammable via InPower service tool: enable/disable, status (warning/shutdown/none), active open/closed, and display name.
1318Service EngineCategory B (begin spec J)WarningIndicates emissions criteria might not be met: engine running in open loop, lean mixture, rich mixture, or failed fuel system component.
1334Crit Scaler ORCategory AShutdown
1335Noncrit Scaler ORCategory BWarning
1416Fail To ShutdownCategory CWarning
1417Powr Down ErrorCategory DWarningIndicates controller cannot power down because of unknown condition; possible battery drain. Contact an authorized service center.
1433Emergency StopCategory DShutdownPull emergency stop button out; move O/Manual/Auto switch to O; press Fault Acknowledge/Reset button; select Manual or Auto as required.
1434Remote E-StopCategory DShutdownSee code 1433 to reset.
1435Low Coolant TempCategory DWarningCheck coolant heater power connection/fuse; check for low coolant level and replenish, repairing leaks as needed.
1438Fail To CrankCategory DShutdownPossible fault with control, speed sensing or starting system. See code 441 for corrective action.
1442Weak BatteryCategory DWarningBattery voltage at/below weak-battery trip point during cranking. See code 441 for corrective action.
1443Battery FailedCategory DShutdownDead battery, engine will not start. See code 441 for corrective action.
1444KW OverloadCategory BWarning
1445Short CircuitCategory AShutdown
1446High AC VoltageCategory AShutdown
1447Low AC VoltageCategory AShutdown
1448Under FrequencyCategory DShutdownCheck for dirty/plugged air filter and replace; check by disconnecting load and restarting; fuel system may require adjustment; check gaseous fuel delivery; reset and restart.
1449Over FrequencyCategory AWarning
1452Gen CB Not CloseCategory AWarning
1453Gen CB Not OpenCategory AWarning
1459Reverse PowerCategory AShutdown
1461Loss Of FieldCategory AShutdown
1466Modem FailureCategory CWarning
1468Network ErrorCategory CWarning
1469Speed/Hz MatchCategory AShutdown
1471Over CurrentCategory BWarning
1472Over CurrentCategory AShutdown
1477Over CurrentOver CurrentShutdown
2263Battery TemperatureBattery temperature too high (reaches 55 °C [131 °F]) - battery charger fault messageWarning
2323-2326Network Fault 5 thru 8Category E
2327PTC FaultCategory BWarning
2329Low S1 FrequencyCategory EWarning
2331Low S1 VoltageCategory EWarning
2335Excitation FaultCategory AShutdown
2336Memory ErrorCategory AShutdown
2337Pwr Tran DisabledCategory CWarning
2338Pwr Tran FailureCategory CWarning
2339Pwr Down EnabledCategory EWarning
2341High Control TempCategory BWarning
2342Too Long In Idle (10 min.)Category EWarningIndicates genset has been in Idle mode too long (10 minutes maximum).
2358High S1 VoltageCategory EWarning
2396S1 CB Not CloseCategory EWarning
2397S1 CB Not OpenCategory EWarning
2966PTC TimeoutCategory CWarning
2967Governor FaultCategory CWarning
2968AVR FaultCategory CWarning
2969LON FailureCategory CWarning
2972Field OverloadCategory AShutdown
Fault 1Fault 1 (red)Engine shut down because of a system fault; part of a 10-second time-delay shutdown circuit (customer-wired).Shutdown
FAULT 1FAULT 1Red lamp indicates an undedicated fault; may be field programmed as shutdown or non-shutdown and as timed or non-timed (normally set for timed shutdown).ShutdownNature of fault determined when set installation is designed.
Fault 2Fault 2 (red)Engine shut down because of a system fault; part of a non-time-delay shutdown circuit (customer-wired).Shutdown
FAULT 2FAULT 2Red lamp indicates same features as Fault 1 (normally set for non-timed shutdown).ShutdownNature of fault determined when set installation is designed.
HI ENG TEMPHI ENG TEMPRed lamp indicates engine has shut down because of critically high engine temperature (above 230 F / 110 C).ShutdownAllow engine to cool; check coolant level and airflow; reset control and restart.
High Engine TemperatureHigh Engine Temperature (red)Engine shut down due to excessively high coolant temperature (greater than 230°F / 110°C).Shutdown
LO FUELLO FUELYellow (optional) lamp indicates fuel supply pressure is marginally low (5 inches [127 mm] WC or less).WarningCheck for partially closed shutoff valve or empty propane supply tank; for natural gas check with the gas utility.
LO OIL PRESLO OIL PRESRed lamp indicates engine has shut down because of critically low oil pressure (below 25 psi / 172.4 kPa).ShutdownCheck oil level, lines and filters; replenish if low; reset control and restart.
LOW ENG TEMPLOW ENG TEMPYellow lamp lights if engine temperature is marginally low for starting (70 F / 21 C or lower); may indicate an inoperative coolant heater.WarningCheck coolant heater operation, power supply, fuse/cord and coolant level.
Low Engine TemperatureLow Engine Temperature (yellow)Engine temperature less than 65°F (18°C) or 90°F (32°C); possibility engine might not start.Warning
Low FuelLow Fuel (yellow, optional)Fuel supply pressure is 5 inches (127 mm) WC or less; also indicates operation on secondary fuel supply for dual-fuel sets.Warning

Showing the first 80 of 93 codes.

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
Gaseous Fuel Adjustments adjustment

⚠ Fuel is highly flammable; do not allow cigarettes, flame, pilot lights, arcing switches or equipment in area or areas sharing ventilation.

Tools: Exhaust gas analyzer (for emission sensitive areas)

  1. Start the engine and let set warm up under partial load (at least 1/4 rated load); start with natural gas if dual fuel.
  2. Connect full rated load and turn power adjust valve to full-rich.
  3. Slowly turn adjust valve towards lean until engine begins to lose speed, then back towards rich until engine carries full load smoothly.
  4. If equipped for natural gas and LPG, switch to LPG by closing manual shutoff valve in the natural gas supply line.
  5. Reconnect full rated load and turn LPG flow adjustment valve clockwise until engine loses speed, then slowly back counterclockwise until engine carries full load smoothly.
Gaseous Fuel System Adjustment adjustment

⚠ Fuel is highly flammable and may cause severe personal injury and property damage. Do not allow cigarettes, flame, pilot lights, arcing switches or equipment in area or areas sharing ventilation.

Tools: Exhaust gas analyzer (for emission sensitive areas)

  1. Start the engine and let the set warm up under a partial load (at least 1/4 rated load); on dual fuel sets start with natural gas.
  2. Connect full rated load and turn the manual fuel valve two turns counterclockwise.
  3. Slowly turn the manual fuel valve clockwise (lean) until the engine begins to lose speed.
  4. Slowly turn it counterclockwise (rich) until the engine carries the full load smoothly.
  5. On dual fuel sets, switch to LPG by closing the manual shutoff valve in the natural gas supply line.
  6. Reconnect full rated load and turn the LPG flow adjustment valve clockwise until the engine begins to lose speed.
  7. Slowly turn it back counterclockwise until the engine carries full load smoothly.
Magnetic Speed Pickup Unit Adjustment adjustment
  1. Measure MPU resistance; replace if not between 1,000 and 1,050 ohms.
  2. With MPU removed, rotate ring gear until a tooth lines up in the center of the mounting hole.
  3. Thread pickup in gently by hand until it just touches the ring gear tooth.
  4. Back the pickup out 1/4 turn and set the locknut.
  5. Verify MPU output voltage at cranking speed is at least 1.5 VAC; replace MPU if less.
Output Voltage Adjustment adjustment
  1. Adjust output voltage plus or minus five percent of nominal voltage using the Voltage Adjust rheostat (optional) on the control panel.
  2. Call your distributor if the required voltage cannot be obtained by this adjustment.
Type A Gaseous Fuel Adjustment (Naturally Aspirated) adjustment

⚠ Gaseous fuels are flammable and explosive

  1. Disconnect all loads, shut down set, and disconnect governor linkage at the carburetor.
  2. Start engine and hold throttle closed by hand to prevent overspeed.
  3. Adjust throttle idle position screw to obtain a frequency of 25-35 Hz.
  4. Turn idle adjusting screw counterclockwise until engine becomes unstable, then clockwise to regain stability.
  5. Reconnect governor linkage.
  6. Connect full rated load and turn main fuel valve to full-rich, then lean until engine loses speed, then back to rich.
  7. If equipped for LPG, switch to LPG and adjust LPG flow valve similarly under full load.
Vibration Isolator Installation and Adjustment Procedure adjustment
  1. Place vibration isolators on the generator set support structure; shim or grout so all isolator bases are within 0.25 inch (6 mm) elevation of each other.
  2. Loosen the side snubber lock nuts so the top plate is free to move vertically and horizontally; verify alignment with base and springs.
  3. Place the generator set onto the isolators while aligning the skid mounting with the threaded isolator hole.
  4. Adjust isolators with the leveling bolt to level the set; nominal clearance between top plate and base is 0.25 inch (6 mm) or greater.
  5. If radiator and engine/alternator are mounted on separate skids, make both skids level for proper fan belt alignment.
  6. If the set is not level, adjust leveling bolts until level with sufficient, roughly equal clearance on all isolators.
  7. Lock the leveling bolt in place with the lock nut.
  8. Leave snubber nuts loose to provide better isolation between the generator set and support structure.
Checking AC Electric System While Running diagnostic

⚠ High voltages are present inside the control box and generator output box when the set is running. Do not open the boxes while the set is running.

  1. Check the frequency meter; generator frequency should be stable and match the nameplate rating.
  2. Turn the phase selector switch to each line-to-line phase selection (L1-L2, L2-L3, L3-L1) and read the AC voltmeter; at no load voltage should match nameplate rating.
  3. Turn the phase selector switch to each phase (L1, L2, L3) and read the AC ammeter; at no load current should be zero.
  4. Push the Reset/Lamp switch; all indicator lamps should light, confirming all bulbs are on.
  5. Have any burned out bulbs replaced.
Verify Overspeed Fault Detection diagnostic

Tools: special tool P/N 420-0604

  1. For Type A sets, move the throttle lever/linkage to increase RPM to the overspeed shutdown range.
  2. For Type B sets, remove the two screws securing the throttle body cover and remove cover.
  3. Use special tool P/N 420-0604 to turn the end of the throttle shaft.
  4. With genset operating at no load, slowly rotate the shaft clockwise until RPM reaches the overspeed limit and shuts down.
  5. Replace the throttle body cover after completing the test.
Battery Connections (Prestart Preparation) installation

⚠ Accidental starting can cause severe personal injury or death.

⚠ Ignition of explosive battery gases can cause severe personal injury or death.

⚠ Ventilate battery area before working on or near battery. Arcing, flames, pilot lights and sparks can ignite battery gas.

  1. Make sure the Run/Off/Auto switch on the control panel is set to Off before connecting battery cables.
  2. Connect the positive battery cable before connecting the negative battery cable to prevent arcing.
  3. Connect the negative (–) battery cable last to prevent arcing.
  4. Service the battery as necessary; connect a separate battery charger if an ATS without built-in charge circuit is installed.
CT Installation Requirements installation

⚠ Each of the operations described should be done only by persons trained and experienced in electrical maintenance.

  1. The CT has a dot on one side; this dot must face toward the generator (conventional current flowing into the dot). A dot also indicates pin 1 of the CT.
  2. CT21 – U load leads (A phase); CT22 – V load leads (B phase); CT23 – W load leads (C phase).
  3. Route the appropriate load wires through each CT.
  4. The CTs have dual secondaries (3 pins). The secondary wire marked 1 connects to pin 1; wire marked 2/3 connects to pin 2 for high voltage gensets or pin 3 for low voltage gensets.
Connecting the Battery to the Generator Set installation

⚠ A battery must not be fitted to a generator set without charge if the specific charge of the electrolyte has fallen below 1.240 during storage.

⚠ Even momentary incorrect connection can cause damage to the electrical system.

Tools: Insulated wrench

  1. Secure the battery. Battery hold-down bolts must be tight, but not over-tight.
  2. Smear the terminals with petroleum jelly, if necessary.
  3. Fit the vents firmly in position and ensure that the battery is clean and dry.
  4. Verify correct polarity when connecting the battery to the set.
  5. Use an insulated wrench to connect the positive generator cable first, followed by the negative cable. Terminal connections must be tight, but not over-tight.
Installation Checklist - Prestart installation

⚠ Improper wiring can cause a fire or electrocution.

  1. Verify wattage capacity sufficient for anticipated load.
  2. Verify at least 3 feet clearance around generator set.
  3. Verify genset located away from flooding.
  4. Check fuel tanks, lines and shutoff valves meet codes and are free of leaks.
  5. Check exhaust system for leaks, secure connections, condensation drain, insulation.
  6. Check AC and DC wiring sizes, insulation, conduits and connections meet codes.
  7. Service engine with oil and coolant.
  8. Verify batteries installed, serviced and charged.

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
Line 0 or NeutralN / N / NLoad terminal line designations
Line 1L1 / A / ULoad terminal line designations
Line 2L2 / B / VLoad terminal line designations
Line 3L3 / C / WLoad terminal line designations
TB1 Customer Faults1=Customer Fault 1, 2=Ground Fault, 3=Low Fuel, 4=Rupture Basin FaultDefault settings, beginning spec J customer input #4 not available
TB1 Customer Relays1=Common Warning, 2=Common Shutdown, 3=Not in Auto, 4=Ready to LoadDefault settings; NO contacts rated 2 amps at 30 VDC

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 power rating of the Cummins/Onan GGHG?

The Cummins/Onan GGHG is rated 85 kW standby (106.0 kVA).

What engine is in the Cummins/Onan GGHG?

The Cummins/Onan GGHG is powered by the Ford V-10 6.8L engine.

What fuel type does the Cummins/Onan GGHG take?

The Cummins/Onan GGHG runs on Natural gas/propane.

What is the oil capacity of the Cummins/Onan GGHG?

The Ford V-10 6.8L engine in the Cummins/Onan GGHG has an oil capacity of 5.5 liters.

How much coolant does the Cummins/Onan GGHG hold?

The Cummins/Onan GGHG cooling system holds 33.1 liters (8.7 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

How loud is the Cummins/Onan GGHG?

The Cummins/Onan GGHG is rated at 72.0 dBA at 7 m, per the manufacturer specification sheet.

What is the dry weight of the Cummins/Onan GGHG?

The Cummins/Onan GGHG has a dry weight of 1071 kg (2361 lb).

What voltage does the Cummins/Onan GGHG produce?

The Cummins/Onan GGHG is offered in 110/120 V, 240 V, 1-phase.

What size battery does the Cummins/Onan GGHG need?

The Cummins/Onan GGHG uses 1 battery, 12 Volts DC V each, 1000 CCA, group 31, per the manufacturer specification sheet.

Which alternator is fitted to the Cummins/Onan GGHG?

The Cummins/Onan GGHG uses a Brushless, 12-lead alternator.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
Green RUN lamp lights following engine startupIndicates all engine systems are normal. No corrective action required.
PRE HI ENGINE TEMP lamp lights. Engine continues to operate. (Engine can be programmed to shut down.)Engine has begun to overheat and engine temperature has risen to approximately 220°F (104° C) or coolant level is low on optionally wired setsIf generator is powering non-critical and critical loads and cannot be shut down, reduce load if possible by turning off non-critical loads; check air inlets and outlets and remove any obstructions to airflow; if engine can be stopped, follow procedure in step 3
HI ENG TEMP lamp lights. Engine shuts down.Engine has overheated (engine temperature has risen above 230°F/110°C) or coolant level is lowAllow engine to cool down completely before proceeding with the following checks: check coolant level and replenish if low, look for possible coolant leakage points and repair if necessary; check for obstructions to cooling airflow and correct as necessary; check for a slipping fan belt and tighten if loose; reset control and restart after locating and correcting problem; contact an authorized service center if none of the above
PRE LO OIL PRES lamp lights. Engine continues to operate. (Engine can be programmed to shut down.)Engine oil pressure has dropped to 30 psi (207 kPa)If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow step 5 procedure; if engine can be stopped, follow procedures in step 5
LO OIL PRES lamp lights. Engine shuts down. NOTE: See also step 6.Engine oil pressure has dropped to 25 psi (172 kPa)Check oil level, lines and filters; if oil system is OK but oil level is low, replenish; reset control and restart; contact an authorized service center if oil pressure is not in the range of 40 to 80 psi (276 to 552 kPa)
OVERCRANK lamp lights and engine stops cranking. or Engine runs, shuts down, and LO OIL PRES lamp lights.Possible fuel system problemOpen any closed fuel shutoff valve; check for dirty or plugged air filter and replace if necessary (see Maintenance section); gaseous fuel delivery to the set is inadequate, contact an authorized service center for service; reset the control and restart after correcting the problem, contact an authorized service center for service if none of the above

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan GGHG troubleshooting guide (248 entries) →

Parts

103
Part #DescriptionQtySystem
0123-2148Indicator, Oil (Not Shown)1Oil indicator Amazon eBay $74.95
11002starter motor1Motor Amazon eBay FridayParts $175.60
123-2176Separater, Oil1Oil filter Amazon eBay $61.00
123-2185Cap-Oil Fill1Oil filter Amazon eBay
130-5258Thermostat (85°C) (Must Purchase F1VY-8255-A O-ring seal from Ford)1Thermostat Amazon eBay
140-3140Air Cleaner - Top2Air filter Amazon eBay
140-3146-01Air Cleaner - Bottom1Air filter Amazon eBay
140-3246Gasket, Air Cleaner1Air filter Amazon eBay
140-3265Base, Mounting - Air Cleaner1Air filter Amazon eBay
140-3269Breather, Air Cleaner1Breather Amazon eBay
148-1140Carburetor (Includes Gaskets)1Gasket Amazon eBay
167-1639Plug, Spark (Ford Part Number AGSF-22-FM1) (.035 Gap)10Spark plug Amazon eBay $16.00
193-0318Sender, Water Temperature1Sensor Amazon eBay $73.95
193-0529-01Sender, Oil Temperature1Sensor Amazon eBay
193-0551-01Sensor-Map (Ignition)1Sensor Amazon eBay
193-0551-02Map, Sensor1Sensor Amazon eBay
1U1L-12A297-AATurbocharged with 2400 Overspeed Shutdown1Turbocharger Amazon
307-2884Elbow, Pipe1Elbow Amazon eBay
332-3561Base, Mounting - Air Cleaner1Air filter Amazon eBay
5-10SERPENTINE BELT REPLACEMENT1Belt Amazon Amazon eBay eBay
503-1870-07Clamp, Hose2Hose Amazon eBay
503-2166Hose, Breather1Hose Amazon eBay
503-2223Hose, Breather1Hose Amazon eBay
503-2233Hose, Crank Case - Vent1Hose Amazon eBay
503-2296-01Hose, Breather1Breather hose Amazon eBay
505-0091Adapter, Carburetor1Adapter Amazon eBay
511-0161-21Belt, Serpentine - 6 Groove1Belt Amazon eBay
512-0211Pulley-Water Pump1Pump Amazon eBay
512-0252Tensioner, Belt1Belt Amazon eBay $298.00
800-3017-20Harness, Wiring - Dual Fuel1Harness Amazon eBay
ESE-M97B44-ASilicone Gasket and Sealant (ESE-M97B44-A)N/AGasket Amazon eBay
F5FZ-19549-CCSilicone Gasket and Sealant (in Oregon F5FZ-19549-CC)N/AGasket Amazon eBay
F6AZ-19562-AASilicone Gasket and Sealant (in Canada CXC-8-B)N/AGasket Amazon eBay
N806177Bolt, Hex Flange Head Pilot, M8 x 1.25 x 535Bolt Amazon eBay
N808140Stud and Washer, Hex-Head Pilot, M10 x 1.5 x M8 x 1.25 x 109.65Stud and washer Amazon eBay
N808142Screw and Washer, Hex Pilot, M10 x 1.5 x 57.53Screw and washer Amazon eBay
N808529Stud, Hex-Head Pilot, M10 x 1.5 x 1.5 x 103.12Stud Amazon eBay
N8089Alternator20Generator Amazon eBay
TB1-5Charger AC Failure1Terminal block Amazon eBay NAPA $30.91 FridayParts $20.80
TB3-1Terminal for relay K1 in the auxiliary relay board (ARB)1Relay terminal Amazon eBay FridayParts $269.00
TB4-5Terminal for relay K2 in the auxiliary relay board (ARB)1Relay terminal Amazon eBay FridayParts $25.07 KuduParts $30.00 SinoCMP $129.00
TB6-5Terminal for relay K3 in the auxiliary relay board (ARB)1Relay terminal Amazon eBay
XIN010AStarter Motor3Starter Amazon eBay
YC22-8575-AAThermostat - 192F, optional (Ford Part Number)1Thermostat Amazon eBay
YU1L-12A297-AATurbocharged with 2400 Overspeed Shutdown1Turbocharger Amazon
104-1974Bolt, Flywheel (M10 x 1.5 x 26.5)8Service part / kit Amazon eBay
107-R0921Tapersert Installation KitService part / kit Amazon
123-2147Tube-Oil Level (Not Shown)2Service part / kit Amazon eBay
123-2247Valve-PCV (Low Flow)2Service part / kit Amazon eBay FridayParts $94.50
130-5256Screw-Tensioner3Service part / kit Amazon eBay
130-5257Screw-Idler1Service part / kit Amazon eBay
130-5386Screw-Idler1Service part / kit Amazon eBay
132-0331Cap-Heater Tube (Not Shown)1Service part / kit Amazon eBay $9.95
132-0412Cap-Heater Tube (3/4) (Not Shown)1Service part / kit Amazon eBay
140-3267Box, Air - Adapter (Used on Generator Sets with F172 or F173 Enclosure)1Service part / kit Amazon eBay
148-1090Clamp, Fuel System - Input1Service part / kit Amazon eBay
150-2808Woodward Governor ThrottleService part / kit Amazon eBay
155-3719Cover-Exhaust (Not Shown)1Service part / kit Amazon eBay
326234-5Coolant heater, 1500w, 120vService part / kit eBay
332-1389Tie, Cable1Service part / kit Amazon eBay
505-0004Nipple, Pipe (1.0 x 1.50)1Service part / kit Amazon eBay
512-0250Pulley (Smooth Idler)1Service part / kit Amazon eBay $216.15
512-0251Pulley (6 Groove Idler)1Service part / kit Amazon eBay
517-0289Plug, Hole1Service part / kit Amazon eBay
520-1024Stud (M6)4Service part / kit Amazon eBay
520-1026Stud-EXH Manifold20Service part / kit Amazon eBay
525-0304Gallon Can1Service part / kit Amazon eBay
525-030512 oz. Pressurized Spray Can1Service part / kit Amazon eBay
525-0306Quart Can1Service part / kit Amazon eBay
526-0018Gasket, Flange (1-3/4)1Service part / kit Amazon eBay
526-0174Clamp, Muffler (1.50")1Service part / kit Amazon eBay $9.95
526-2080Washer, Flat (M6)4Service part / kit Amazon eBay FridayParts $260.00
526-2100Washer, Flat (M8)2Service part / kit Amazon eBay
527003GCP (ECU) & HarnessService part / kit Amazon eBay
6680060Mixer, DEPR and Vapor RegulatorService part / kit Amazon eBay
800-2089F lywhee 1 Screw, Cap - Hex !-lead (M1O X 45~) Grille, Air Outlet Screw, Socket Head (1/4-20 x 1/4')1Service part / kit Amazon eBay
818-0237-01Rivet, Pop (1/8)6Service part / kit Amazon eBay
821-6003-02Screw, Cap - Hex Head (M8 x 1.25 x 25mm)2Service part / kit Amazon eBay
862-0001Nut, Hex (1/4-20)2Service part / kit Amazon eBay $19.72
865-0020Nut, Wing1Service part / kit Amazon eBay $24.16
928-0615CGenerator Set GGHG/GGHHService part / kit Amazon eBay
928-0617PowerCommand 2100 Controller5Service part / kit Amazon eBay
A026J009Woodward Air Fuel Control Valve (AFC)Service part / kit Amazon eBay
A034E251Woodward Governor Throttle service kit - US (EPA Compliant) generators1Service part / kit Amazon eBay
A034T573Woodward AFC service kit - US (EPA Compliant) generators1Service part / kit Amazon eBay
A034T575Woodward AFC service kit - Export (Non-EPA Compliant) generatorsService part / kit eBay
A034T577Woodward Governor Throttle service kit - Export (Non-EPA Compliant) generatorsService part / kit eBay
D81L-4201-AFeeler GaugeService part / kit Amazon
D81L-6002-BPlastigage®Service part / kit Amazon eBay
D9AZ-19579ASuper Premium Engine Oil SAE 5W30 (D9AZ-19579A)N/AService part / kit Amazon eBay eBay
E3D35-AEpoxy sealer meeting Ford specification M3D35-A (E)Service part / kit Amazon
ESE-M2C153-EEngine Oil XO-10W30-QSP or -DSPService part / kit Amazon
F4AZ-19A536-RAMetal Surface Cleaner (F4AZ-19A536-RA)N/AService part / kit Amazon eBay
F8JL-8A500-AA5/8 inch cap, rear tubeService part / kit eBay
F8JL-8A500-BA3/4 inch cap, front tube (if used)Service part / kit eBay
N284948NAPA battery (Core)1Service part / kit eBay
T73L-6011-AEngine Cylinder Hone SetService part / kit Amazon eBay
TOOL-4201-CDial Indicator with BracketryService part / kit Amazon eBay
TOOL-6505-EValve Stem Clearance ToolService part / kit Amazon eBay
WSD-M1C226-AMetal Surface Cleaner (WSD-M1C226-A)N/AService part / kit Amazon eBay
XIN639BFlywheel1Service part / kit Amazon eBay
XU1L-12A297-ABNaturally Aspirated with 2250 Overspeed Shutdown1Service part / kit Amazon
YU1L-12A297-CANaturally Aspirated with 4000 Overspeed Shutdown1Service part / kit Amazon

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

RatingLoadL/hgal/h
Prime2%268.77.6
Prime3%354.210.0
Prime4%439.712.4
Prime100%183.25.2
Standby2%703.4185.82
Standby3%938.2247.85
Standby4%1173.0309.87
Standby25%19.15.05
Standby50%28.07.4
Standby75%36.89.72
Standby100%45.712.07

Available documents

Spec sheet (Cummins/Onan)Spec sheet — Cummins-100-kW-GGHH-Spec-and-Data-Sheet (Cummins/Onan)Spec sheet — d-3384Spec sheet — s-1607 (Cummins/Onan)Operator's manual — 928-0138 Cummins GGHG GGHH Operator's Manual (6-2001) (Cummins/Onan)Operator's manual — 928-0141 Cummins GGHG GGHH Operator's Manual (8-2003) (Cummins/Onan)Operator's manual — 928-0144 Onan GGHG GGHH Genset Operators manual (04-2009) (Cummins/Onan)Operator's manual — Power Command Operation (Cummins/Onan)Parts manual — 0928-0239 I0 201711 (Cummins/Onan)Parts manual — 0928-0245 I32 202105 (Cummins/Onan)Service manual — 5922 85kWGGHG install (Cummins/Onan)Service manual — 928-0615 Cummins GGHG GGHH Installation Manual (9-2002) (Cummins/Onan)Service manual — 928-0618 Cummins GGHG GGHH Installation Manul (9-2010) (Cummins/Onan)Service manual — CPGF-P-00000080-2 I2 201108 (Cummins/Onan)Service manual — Cummins-GGHH-GGHG-Installation-Manual (Cummins/Onan)Service manual — GGFD, GGFE, GGHE, GGHF, GGHG, GGHH service manual (Cummins/Onan)

This page was generated from the 16 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

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