Name: Cummins/Onan GGHG Generator Set
Brand: Cummins/Onan

Service parts for the GGHG

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

Belts

1 required

511-0161-21Beltsee priceAmazon

Electrical

1 required

416-0823Battery$100.39eBay

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

Specifications

Fuel	NG, LP
Frequency	60.0 Hz
Standby power	85 kW
Standby kVA	85
Prime power	85 kW
Controller	Detector, PCC2100, PowerCommand 2100, PowerCommand 2100 (PCC2100), PowerCommand PCC2100
Oil capacity	6.2 L
Alternator	Brushless, 12-lead
Voltage options	110/120 V, 240 V
Phase	1
Rated current	295 A
Power factor	1.0
Circuit breaker	400 A
Battery group	31
Battery cranking	1000 CCA
Battery voltage	12 Volts DC V
Battery quantity	1
Coolant capacity	33.1 L (8.8 Gal with Standard Radiator) L
Max ambient	50 °C
Dimensions (L×W×H)	3614×1520×1789 mm
Dry weight	1071 kg
Sound level	72.0 dBA @ 7 m

Engine

Ford V-10 6.8L

Oil capacity	5.5 L
Displacement	6.8 L
Rated speed	1800 rpm

Maintenance & consumables

for the Ford V-10 6.8L

Item	Spec	Capacity	Part #	Interval
Air filter	Tap on flat surface to remove dirt; low pressure air (30 psi) inside; replace if damaged		—	2000 hr
Fuel filter			—
Oil filter	Apply thin film of oil to gasket, tighten 1/2 to 3/4 turn after gasket contact		—	250 hr
Battery	Vented lead acid, Group 31, 12 Volts DC, CCA 1,000 minimum; cold soak @ 0 F (-18 C)		416-0823	200 hr	Amazon eBay $100.39
Belt	Belt, Serpentine - 6 Groove		511-0161-21		Amazon eBay
Coolant	50/50 coolant solution (50% pure water and 50% antifreeze); 65% antifreeze/35% water below -37 F (-38 C)	33.1 L	—
Coolant filter			—	500 hr
Oil	API classification SJ or SJ/CD	11.0 L	—	250 hr
Spark plug	Gap 0.035 in (0.9 mm)		—	1000 hr

Service intervals

Item	Action	Hours	Months	Notes
Air cleaner (normal duty filter)	Check	100 hr		Perform more often in extremely dusty conditions; replace element after 500 hours.
All exhaust components and hardware (fittings, clamps, fasteners)	Check	8 hr		Daily; audibly and visually with generator set running
All hardware (fittings, clamps, fasteners, etc.)	Check	100 hr		Daily or after 8 hours.
Bedframe fluid containment (where fitted)	Drain	8 hr		Daily; drain if necessary
Coolant heater(s)	Check	8 hr		Daily.
Coolant level	Check	8 hr		Daily.
Coolant level of radiator(s) (water jacket & LTA)	Check	8 hr		Daily
Cooling fan blades	Check	8 hr		Visual inspection required daily
Drive belt condition and tension	Check	8 hr		Visually check belt for wear or slippage; replace if hard or brittle (Service Engineer)
Engine oil level	Check	8 hr		Daily.
Fuel level in tank	Check	8 hr		Daily or after 8 hours
Fuel lines and hoses	Check	8 hr		Daily; check for oil, fuel, coolant and exhaust system leaks (Table 5 note 1)
General set	Inspect	8 hr		Check for oil, fuel, cooling and exhaust system leaks; inspect exhaust audibly/visually with set running and repair leaks immediately.
General set inspection	Inspect	8 hr		Daily. Check for oil, fuel, cooling and exhaust system leaks; check exhaust audibly and visually with set running.
Crankcase oil	Change	50 hr		First service — Drain and replace crankcase oil after the first 50 hours of operation on new generator sets (break-in).
Engine oil and filter	Change	250 hr	6 mo	First service — Replace after the initial running-in period of 50 hours; contact your authorized distributor (Table 5 note 5)
Engine oil and filter	Drain	50 hr		First service — Break-in: drain and replace crankcase oil after first 50 hours of operation on new generator sets.
Air cleaner	Check	100 hr		Monthly; replace as necessary. Perform more often in extremely dusty conditions.
Battery electrolyte level	Check	100 hr	1 mo	Monthly.
Engine oil and filter (normal duty filter)	Change	100 hr	12 mo	Perform more often in extremely dusty conditions; perform at least once a year.
Generator air outlet	Check	100 hr	1 mo	Monthly.
Governor linkage	Check	100 hr		Perform more often in extremely dusty conditions.
All hardware (fittings, clamps, fasteners)	Check	250 hr	6 mo
Drive belt	Check	250 hr	6 mo	Visually check for wear or slippage; replace if hard or brittle.
Engine coolant port caps	Check	250 hr	6 mo	Replace after 4 years or 1000 hours.
Exterior of radiator	Inspect	250 hr	6 mo	Inspect for obstructions.
Radiator exterior	Inspect	250 hr	6 mo	Inspect for obstructions.
Radiator hoses	Check	500 hr	12 mo	Check for wear and cracks; replace if hard or brittle.
Radiator hoses	Inspect	250 hr	6 mo	Replace if hard or brittle.
AC generator and controls	Check	500 hr	12 mo	Yearly.
Anti-freeze	Check	500 hr	12 mo	Yearly.
Anti-freeze concentration	Check	500 hr	12 mo	Yearly or after 500 hours.
Catalytic converter restriction	Test	500 hr	12 mo	Must be performed by a qualified mechanic; replace every 8 years or 2000 hours.
Cooling systems	Clean	500 hr	12 mo	Yearly.
Oxygen sensor	Inspect	500 hr	12 mo	Must be performed by a qualified mechanic; replace every 1,500 hours (recommended).
Radiator	Drain	1000 hr	24 mo	Drain and flush.
Spark plugs	Inspect	500 hr	12 mo	Replace every 1,000 hours.
Cylinder heads	Other	1000 hr	24 mo	Overhaul cylinder heads.
Alternator vibration levels	Check	3000 hr		Table 6 (3000 hours)
Fuel injectors	Check	3000 hr		Table 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

Type	Item	Value	Unit	Condition
Clearance	Clearance around generator set for service	1	meter
Clearance	Exhaust pipe clearance to combustible wall or partition	305	mm
Clearance	Isolator base elevation tolerance between isolators	0.25	inch (6 mm)
Clearance	Vibration isolator top plate to base clearance	0.25	inch
Clearance	Vibration isolator top plate-to-base clearance (nominal)	0.25	inch (6 mm)
Gap	Spark Plug Gap	0.044	in (1.1 mm)
Gap	Spark plug gap	0.035	in (0.9 mm)
Gap	Spark plug gap	0.044 (1.1 mm)	in (mm)
Other	Adjust - Frequency Adjust range	5	% of nominal frequency
Other	Adjust - Voltage Adjust range	5	% of nominal voltage
Other	Air cleaner bench/paper element cleaning	Not recommended		Cummins Inc. does not recommend cleaning paper-type air cleaner elements
Other	Battery charger output - 12 Volt	15	A
Other	Battery charger output - 24 Volt	12	A
Other	Battery electrolyte specific gravity (fully charged, corrected)	1.260	SG	at 25 °C (77 °F)
Other	Battery specific gravity, charge required below	1.215	specific gravity
Other	Battery specific gravity, fully charged	1.260		corrected; add 0.004 per 10 F above 80 F (27 C)
Other	Battery specific gravity, fully charged (corrected)	1.260	specific gravity	corrected to 80°F (27°C)
Other	Battery specific gravity, recharge threshold	1.215		charge battery if reading is below this value
Other	Battery storage charging - further charge interval	6	months	at the normal initial charge rate until voltage ceases to rise
Other	Boost Charge interval (if charger fitted with Boost switch)	6	months	normally around every six months per battery manufacturer
Other	Charge battery if specific gravity below	1.215	SG
Other	Cooldown at idle timer	0 - 30	minutes
Other	Low Fuel warning (yellow lamp)	5	inches (127 mm) WC or less	dual or single fuel systems
Other	Output voltage adjustment range (voltage adjust rheostat, optional)	±5	% of nominal voltage
Other	Overcrank timed cranking period	approximately 75	seconds, including two rest periods
Other	Rated To Idle delay	0 - 10	seconds	default = 0; Beginning Version 2.303
Other	Secondary regulator initial adjustment (distance from top of regulator to top of set screw), NG, 60 Hz	12.1	mm
Other	Secondary regulator initial adjustment, NG, 60 Hz	13.35	mm
Other	Secondary regulator initial adjustment, NG, 60 Hz	15.9	mm
Other	Specific gravity temperature correction	0.007	SG per 10 °C (18 °F)	subtract above 25 °C (77 °F), add below
Other	Specific gravity, at end of charge, ambient frequently above 32 °C (90 °F)	1.240 - 1.260	SG
Other	Specific gravity, at end of charge, ambient normally below 32 °C (90 °F)	1.240	SG
Other	Specific gravity, electrolyte for filling new cells, ambient frequently above 32 °C (90 °F)	1.270 - 1.290	SG
Other	Specific gravity, electrolyte for filling new cells, ambient normally below 32 °C (90 °F)	1.270	SG
Other	Start Delay	0 - 300	seconds	default = 0
Other	Starting cycles (crank/rest)	3	start cycles	default: 3 cycles composed of 15 seconds of cranking and 15 seconds of rest
Other	Stop Delay	0 - 600	seconds	default = 0
Other	Time Delay To Stop	0 - 600	seconds
Other	Warm-up at idle time delay	0 - 300	seconds
Pressure	Concrete compressive strength for seismic anchors	4000	PSI
Pressure	Exhaust Backpressure (Max. Allowed)	25	inch H2O (6.25 kPa)	maximum
Pressure	Exhaust backpressure (max allowed)	20	inch H2O (5.0 kPa)
Pressure	Fuel inlet pressure (LPG liquid withdrawal)	312	psi (2,153 kPa)
Pressure	Fuel inlet pressure maximum (LPG liquid withdrawal)	312	psi (2,153 kPa)	liquid withdrawal
Pressure	Fuel inlet pressure maximum (NG/LPG vapor withdrawal)	13.6	inch H2O (3.4 kPa)
Pressure	Fuel inlet pressure minimum (NG/LPG)	7.0	inch H2O (1.7 kPa)
Pressure	Gaseous fuel supply inlet pressure - maximum operating	13.6	in. water column (25.4 mmHg)
Pressure	Gaseous fuel supply inlet pressure - minimum operating	7.0	in. water column (13.07 mmHg)
Pressure	LO FUEL lamp (fuel supply pressure marginally low)	5 (127 mm) WC or less	inches WC
Pressure	LOP jumper alternate shutdown setting	14	psi (97 kPa)	alternate jumper position (not recommended, see caution)
Pressure	LP gas pressure at full load	negative 1.0	inch WC (0.249 kPa)	full load
Pressure	LP gas pressure at mixer, full load	-1.0	inch WC (0.249 kPa)	full load
Pressure	LP gas pressure at mixer, no load	-0.5	inches WC (0.13 kPa)	no load
Pressure	LP gas pressure at no load	negative 0.5	inches WC (0.13 kPa)	no load
Pressure	LPG Liquid Withdrawal Fuel Flow Inlet Pressure Maximum	312	psi (2,153 kPa)	maximum
Pressure	LPG gas pressure at mixer, full load	approximately -1.0	inches WC
Pressure	LPG gas pressure at mixer, no load	approximately -0.5	inches WC
Pressure	Low Oil Pressure shutdown (red lamp), LOP jumper set to 25 psi	less than 25	psi (173 kPa)
Pressure	Low fuel pressure alarm (engine control module)	3 (76.2 mm) water column	inches WC	primary fuel pressure falls below
Pressure	Low oil pressure shutdown	25	psi (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

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant	50% Ethylene Glycol and water	Fleetguard® Compleat ES low-silicate antifreeze, or equivalent			Standard 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.
Coolant	50/50 coolant solution (50% pure water, 50% antifreeze); 65% antifreeze/35% water if below -37°F (-38°C)			33.1 L	Cooling 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.
Coolant	50/50 water/antifreeze (65% antifreeze/35% water below -37F/-38C); no anti-leak additives		above -38°C	8.8 Gal (33.1 L)	Use soft water low in mineral content.
Coolant	50/50 coolant solution (50% pure water and 50% antifreeze)	Do not use antifreeze containing anti-leak additives; use soft, low-mineral water	above -37°C	33.1 L	If 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 oil	High-quality multi-viscosity lubricating oil such as Cummins Premium Blue® or its equivalent				Consult your authorized distributor for correct lubricating oil specifications for your operating conditions. Special running-in oils are not recommended.
Engine oil	Refer to oil viscosity chart (Figure 5-1)	API SJ or SJ/CD		6.2 L	Select grade right for the lowest ambient temperature expected.
Engine oil	SAE 10W30, 5W30, 15W40	API classification SJ, SH or SL		6.2 L	Oil 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 oil	API SJ, SH or SL; SAE 10W30, 5W30 or 15W40 per ambient temperature chart	API	above -25°C	6.5 Qts (6.2 L)	Use SAE5W synthetic oil if ambient temperature is consistently below -13F (-25C).
Engine oil	SAE 5W synthetic	API SJ or SJ/CD	above -25°C	6.2 L	Use 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).
Fuel	Natural 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.
Fuel	Natural 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

Code	Name	Meaning	Severity	Action
1123	Shutdown After BS	Shutdown After Battle Short	Shutdown
1124	Delayed Shutdown	Delayed Shutdown	Warning
1131	Battle Sh Active	Category E	Warning
121	Speed Signal Lost	Speed Signal Lost	Shutdown
1311	Customer Input #1	Optional customer selection (e.g. Low Fuel Day Tank, Water In Fuel, Ground Fault, Low Starting Hydraulic Pressure, Low Starting Air Pressure)	Warning	Programmable via InPower service tool: enable/disable, status (warning/shutdown/none), active open/closed, and display name.
1312	Customer Input #2	Optional customer selection	Warning	Programmable via InPower service tool: enable/disable, status (warning/shutdown/none), active open/closed, and display name.
1313-1316	Network Fault 1 thru 4	Network Fault 1 through 4	Warning
1317	Customer Input #3	Optional customer selection	Warning	Programmable via InPower service tool: enable/disable, status (warning/shutdown/none), active open/closed, and display name.
1318	Service Engine	Optional customer selection	Warning	Indicates emissions criteria might not be met: engine running in open loop, lean mixture, rich mixture, or failed fuel system component.
1334	Crit Scaler OR	Critical Scaler Out of Range	Shutdown
1335	Noncrit Scaler OR	Non-critical Scaler Out of Range	Warning
135	Oil Pressure Sensor H	Oil Pressure Sensor H	Warning
141	Oil Pressure Sensor L	Oil Pressure Sensor L	Warning
1416	Fail to Shutdown	Fail to Shutdown	Warning
1417	Pwr Down Error	The control cannot power down due to some unknown condition; possible drain on battery	Warning	Indicates controller cannot power down because of unknown condition; possible battery drain. Contact an authorized service center.
143	Pre-Low Oil Pres	Pre-low oil pressure - engine oil pressure has dropped to an unacceptable level	Warning	If the generator is powering critical loads and cannot be shut down, wait until the next shutdown period and then follow code 415 procedure.
1433	Emergency Stop	Local Emergency Stop	Shutdown	Pull emergency stop button out; move O/Manual/Auto switch to O; press Fault Acknowledge/Reset button; select Manual or Auto as required.
1434	Remote E-stop	Remote Emergency Stop	Shutdown	See code 1433 to reset.
1435	Low Coolant Temp	Engine coolant heater is not operating or is not circulating coolant; occurs when engine coolant temperature is 70 °F (21 °C) or lower	Warning	Check coolant heater power connection/fuse; check for low coolant level and replenish, repairing leaks as needed.
1438	Fail to Crank	Possible fault with control, speed sensing or starting system	Shutdown	See code 441 for corrective action.
144	Coolant Sensor High	Coolant Sensor High	Warning
1442	Weak Battery	During cranking, the battery voltage is at or below the weak battery warning trip point for a time greater than or equal to the weak battery set time	Warning	See code 441 for corrective action.
1443	Battery Failed	Dead battery - engine will not start	Shutdown	See code 441 for corrective action.
1444	kW Overload	kW Overload	Warning
1445	Short Circuit	Short Circuit	Shutdown
1446	High AC Voltage	High AC Voltage	Shutdown
1447	Low AC Voltage	Low AC Voltage	Shutdown
1448	Under Frequency	Possible fuel system problem or overload condition	Warning	Check 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.
1449	Over Frequency	Over Frequency	Warning
145	Coolant Sensor Low	Coolant Sensor Low	Warning
1452	Gen CB Not Close	Generator circuit breaker not close	Warning
1453	Gen CB Not Open	Generator circuit breaker not open	Warning
1459	Reverse Power	Reverse Power	Shutdown
146	Pre-High Coolant Temp	Engine has begun to overheat (coolant temperature risen to an unacceptable level)	Warning	Reduce load if possible by turning off non-critical loads; check air inlets/outlets for obstructions. If engine can be stopped, follow code 151 procedure.
1461	Loss of Field	Loss of Field	Warning
1466	Modem Failure	Modem Failure	Warning
1468	Network Error	Network Error	Warning
1469	Speed/Hz Match	Speed/Hz Match	Warning
1471	Over Current	Category B	Warning
1472	Over Current	Over Current	Shutdown
1477	Over Current	Over Current	Shutdown
151	High Coolant Temp	Engine has overheated (coolant temperature has risen above the shutdown trip point)	Shutdown	Allow engine to cool. Check coolant level and leakage points, obstructions to cooling airflow, fan belt, blower fan/circulation pumps; reset control and restart.
197	Low Coolant Level	Engine coolant level has fallen to an unacceptable level	Warning	If the generator is powering critical loads and cannot be shut down, wait until the next shutdown period, then follow code 235 procedure. If the engine can be stopped, follow 235 procedure.
2263	Battery Temperature	Battery temperature too high (reaches 55 °C [131 °F]) - battery charger fault message	Warning
2323-2326	Network Fault 5 thru 8	Network Fault 5 through 8	Warning
2327	PTC Fault	Power Transfer Control Fault	Warning
2329	Low S1 Frequency	Low S1 Frequency	Warning
2331	Low S1 Voltage	Low S1 Voltage	Warning
2335	Excitation Fault	Excitation Fault (Loss of Voltage Sense)	Shutdown
2336	Memory Error	Memory Error	Shutdown
2337	Pwr Tran Disabled	Power Transfer Disabled	Warning
2338	Pwr Tran Failure	Power Transfer Failure	Warning
2339	Pwr Down Enabled	Power Down Enabled	Warning
234	Overspeed	Overspeed	Shutdown
2341	High Control Temp	High Control Temperature	Warning
2342	Too Long in Idle (10 min)	The generator set has been in Idle mode too long (10 minutes maximum)	Warning	Indicates the generator set has been in Idle mode too long (10 minutes maximum).
235	Low Coolant Level	Engine coolant level has fallen below the alarm trip point	Shutdown	Allow engine to cool. Check coolant level and replenish, look for leakage points and repair; reset control and restart.
2358	High S1 Voltage	High S1 Voltage	Warning
2396	S1 CB Not Close	S1 Circuit Breaker Not Close	Warning
2397	S1 CB Not Open	S1 Circuit Breaker Not Open	Warning
2966	PTC Timeout	PTC Timeout	Warning
2967	Governor Fault	Governor Fault	Warning
2968	AVR Fault	Category C	Warning
2969	LON Failure	LON Failure	Warning
2972	Field Overload	Field Overload	Shutdown
359	Fail To Start	Possible fuel system problem (engine cranks but fails to start)	Shutdown	Open any closed fuel shutoff valve; check for dirty/plugged air filter and replace if necessary; check gaseous fuel delivery; reset control and restart.
415	Low Oil Pressure	Engine oil pressure has dropped below the shutdown trip point	Shutdown	Check oil level, lines and filters; replenish oil if low; reset control and restart.
441	Low Bat Voltage	Category D	Warning	Check/recharge/replace discharged or defective battery; clean and tighten battery cable terminals; check battery charger float level.
442	High Bat Voltage	Category D	Warning	Check the float level on the battery charger if applicable (lower float level).
FAULT 1	FAULT 1	Red 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).	Shutdown	Nature of fault determined when set installation is designed.
FAULT 2	FAULT 2	Red lamp indicates same features as Fault 1 (normally set for non-timed shutdown).	Shutdown	Nature of fault determined when set installation is designed.
Fault 1	Fault 1 (red)	Engine shut down because of a system fault; part of a 10-second time-delay shutdown circuit (customer-wired).	Shutdown
Fault 2	Fault 2 (red)	Engine shut down because of a system fault; part of a non-time-delay shutdown circuit (customer-wired).	Shutdown
HI ENG TEMP	HI ENG TEMP	Red lamp indicates engine has shut down because of critically high engine temperature (above 230 F / 110 C).	Shutdown	Allow engine to cool; check coolant level and airflow; reset control and restart.
High Engine Temperature	High Engine Temperature (red)	Engine shut down due to excessively high coolant temperature (greater than 230°F / 110°C).	Shutdown
LO FUEL	LO FUEL	Yellow (optional) lamp indicates fuel supply pressure is marginally low (5 inches [127 mm] WC or less).	Warning	Check for partially closed shutoff valve or empty propane supply tank; for natural gas check with the gas utility.
LO OIL PRES	LO OIL PRES	Red lamp indicates engine has shut down because of critically low oil pressure (below 25 psi / 172.4 kPa).	Shutdown	Check oil level, lines and filters; replenish if low; reset control and restart.
LOW ENG TEMP	LOW ENG TEMP	Yellow lamp lights if engine temperature is marginally low for starting (70 F / 21 C or lower); may indicate an inoperative coolant heater.	Warning	Check coolant heater operation, power supply, fuse/cord and coolant level.
Low Engine Temperature	Low Engine Temperature (yellow)	Engine temperature less than 65°F (18°C) or 90°F (32°C); possibility engine might not start.	Warning
Low Fuel	Low 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

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

Procedures

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)

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

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.
Connect full rated load and turn the manual fuel valve two turns counterclockwise.
Slowly turn the manual fuel valve clockwise (lean) until the engine begins to lose speed.
Slowly turn it counterclockwise (rich) until the engine carries the full load smoothly.
On dual fuel sets, switch to LPG by closing the manual shutoff valve in the natural gas supply line.
Reconnect full rated load and turn the LPG flow adjustment valve clockwise until the engine begins to lose speed.
Slowly turn it back counterclockwise until the engine carries full load smoothly.

Magnetic Speed Pickup Unit Adjustment adjustment

Measure MPU resistance; replace if not between 1,000 and 1,050 ohms.
With MPU removed, rotate ring gear until a tooth lines up in the center of the mounting hole.
Thread pickup in gently by hand until it just touches the ring gear tooth.
Back the pickup out 1/4 turn and set the locknut.
Verify MPU output voltage at cranking speed is at least 1.5 VAC; replace MPU if less.

Output Voltage Adjustment adjustment

Adjust output voltage plus or minus five percent of nominal voltage using the Voltage Adjust rheostat (optional) on the control panel.
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

Disconnect all loads, shut down set, and disconnect governor linkage at the carburetor.
Start engine and hold throttle closed by hand to prevent overspeed.
Adjust throttle idle position screw to obtain a frequency of 25-35 Hz.
Turn idle adjusting screw counterclockwise until engine becomes unstable, then clockwise to regain stability.
Reconnect governor linkage.
Connect full rated load and turn main fuel valve to full-rich, then lean until engine loses speed, then back to rich.
If equipped for LPG, switch to LPG and adjust LPG flow valve similarly under full load.

Vibration Isolator Installation and Adjustment Procedure adjustment

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.
Loosen the side snubber lock nuts so the top plate is free to move vertically and horizontally; verify alignment with base and springs.
Place the generator set onto the isolators while aligning the skid mounting with the threaded isolator hole.
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.
If radiator and engine/alternator are mounted on separate skids, make both skids level for proper fan belt alignment.
If the set is not level, adjust leveling bolts until level with sufficient, roughly equal clearance on all isolators.
Lock the leveling bolt in place with the lock nut.
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.

Check the frequency meter; generator frequency should be stable and match the nameplate rating.
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.
Turn the phase selector switch to each phase (L1, L2, L3) and read the AC ammeter; at no load current should be zero.
Push the Reset/Lamp switch; all indicator lamps should light, confirming all bulbs are on.
Have any burned out bulbs replaced.

Verify Overspeed Fault Detection diagnostic

Tools: special tool P/N 420-0604

For Type A sets, move the throttle lever/linkage to increase RPM to the overspeed shutdown range.
For Type B sets, remove the two screws securing the throttle body cover and remove cover.
Use special tool P/N 420-0604 to turn the end of the throttle shaft.
With genset operating at no load, slowly rotate the shaft clockwise until RPM reaches the overspeed limit and shuts down.
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.

Make sure the Run/Off/Auto switch on the control panel is set to Off before connecting battery cables.
Connect the positive battery cable before connecting the negative battery cable to prevent arcing.
Connect the negative (–) battery cable last to prevent arcing.
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.

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.
CT21 – U load leads (A phase); CT22 – V load leads (B phase); CT23 – W load leads (C phase).
Route the appropriate load wires through each CT.
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

Secure the battery. Battery hold-down bolts must be tight, but not over-tight.
Smear the terminals with petroleum jelly, if necessary.
Fit the vents firmly in position and ensure that the battery is clean and dry.
Verify correct polarity when connecting the battery to the set.
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.

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

Connection	Leads	Notes
Line 0 or Neutral	N / N / N	Load terminal line designations
Line 1	L1 / A / U	Load terminal line designations
Line 2	L2 / B / V	Load terminal line designations
Line 3	L3 / C / W	Load terminal line designations
TB1 Customer Faults	1=Customer Fault 1, 2=Ground Fault, 3=Low Fuel, 4=Rupture Basin Fault	Default settings, beginning spec J customer input #4 not available
TB1 Customer Relays	1=Common Warning, 2=Common Shutdown, 3=Not in Auto, 4=Ready to Load	Default 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 (85.0 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 NG, LP.

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.

Which alternator is fitted to the Cummins/Onan GGHG?

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

Troubleshooting

Fault codes

Code	Meaning	Remedy
415	Low Oil Pressure	Check oil level, lines and filters. If the oil system is OK but oil level is low, replenish. Reset the control and restart.
441	Low Bat Voltage	Discharged or defective battery. Check the battery charger fuse. Recharge or replace the battery. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. Check battery charge voltage float level if applicable (raise float level).
442	High Bat Voltage	Indicates battery voltage supply to the control is approaching a high level at which damage to the control can occur. Check the float level on the battery charger if applicable (lower float level).

Symptoms & remedies

Symptom	Cause	Remedy
The engine may or may not shut down immediately	A fault that could cause engine damage, causes an immediate engine shutdown (bypasses engine cooldown sequence). All other faults would allow the engine to run during the cooldown period before engine shutdown.
Warning condition		After the condition is corrected, warning indicators can be reset by pressing the Fault Acknowledge button. In auto mode, warning indicators can also be reset by cycling the remote reset input after the condition is corrected.
Some warnings remain active		This will require the generator set to be shut down to reset the warning indicator.

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 (104 entries) →

Parts

Part #	Description	Qty	System
0123-2148	Indicator, Oil (Not Shown)	1	Oil indicator	Amazon eBay $74.95
123-2185	Cap-Oil Fill	1	Oil filter	Amazon eBay
130-5258	Thermostat (85°C) (Must Purchase F1VY-8255-A O-ring seal from Ford)	1	Thermostat	Amazon eBay
140-3140	Air Cleaner - Top	2	Air filter	Amazon eBay
140-3146-01	Air Cleaner - Bottom	1	Air filter	Amazon eBay
140-3246	Gasket, Air Cleaner	1	Air filter	Amazon eBay
140-3265	Base, Mounting - Air Cleaner	1	Air filter	Amazon eBay
140-3269	Hose, Air Inlet - Air Cleaner	1	Hose	Amazon eBay
148-1090	Valve, PCV	1	Valve	Amazon eBay
148-1140	Carburetor (Includes Gaskets)	1	Gasket	Amazon eBay
167-1639	Plug, Spark (Ford Part Number AGSF-22-FM1) (.035 Gap)	10	Spark plug	Amazon eBay $16.00
193-0318	Sender, Water Temperature	1	Sensor	Amazon $58.99 eBay $73.95
193-0529-01	Sensor, Temperature	1	Sensor	Amazon eBay
193-0551-01	Sensor-Map (Ignition)	1	Sensor	Amazon eBay
193-0551-02	Map, Sensor	1	Sensor	Amazon eBay
307-2884	Elbow, Pipe	1	Elbow	Amazon eBay
332-3561	Base, Mounting - Air Cleaner	1	Air filter	Amazon eBay
5-10	SERPENTINE BELT REPLACEMENT	1	Belt	Amazon Amazon eBay
503-1870-07	Clamp, Hose	1	Hose	Amazon eBay
503-2166	Hose, Breather	1	Hose	Amazon eBay
503-2223	Hose, Breather	1	Hose	Amazon eBay
503-2233	Hose, Crank Case - Vent	1	Hose	Amazon eBay
503-2296-01	Hose, Breather	1	Breather hose	Amazon eBay
505-0091	Adapter, Carburetor	1	Adapter	Amazon eBay
511-0161-21	Belt, Serpentine - 6 Groove	1	Belt	Amazon eBay
512-0211	Pulley-Water Pump	1	Pump	Amazon eBay
512-0252	Tensioner, Belt	1	Belt	Amazon eBay $298.00
520-1024	Stud, Double Ended (M6 x 1.0x45)	4	Stud	Amazon eBay
526-0018	Gasket, Flange (1-3/4)	1	Gasket	Amazon eBay FridayParts $1002.50
800-3017-20	Harness, Wiring - Dual Fuel	1	Harness	Amazon eBay
TB1-5	Charger AC Failure	1	Terminal block	Amazon eBay FridayParts $20.80
TB3-1	Terminal for relay K1 in the auxiliary relay board (ARB)	1	Relay terminal	Amazon eBay FridayParts $269.00
TB4-5	Terminal for relay K2 in the auxiliary relay board (ARB)	1	Relay terminal	Amazon eBay FridayParts $25.07
TB6-5	Terminal for relay K3 in the auxiliary relay board (ARB)	1	Relay terminal	Amazon eBay
YC22-8575-AA	Thermostat - 192F, optional (Ford Part Number)	1	Thermostat	Amazon eBay
104-1974	Bolt, Flywheel (M10 x 1.5 x 26.5)	8	Service part / kit	Amazon eBay
123-2147	Tube-Oil Level (Not Shown)	2	Service part / kit	Amazon eBay
123-2176	Separator, Oil	1	Service part / kit	Amazon eBay $61.00
123-2247	Valve-PCV (Low Flow)	2	Service part / kit	Amazon eBay FridayParts $94.50
130-5256	Screw-Tensioner	3	Service part / kit	Amazon eBay
130-5257	Screw-Idler	1	Service part / kit	Amazon eBay
130-5386	Screw-Idler	1	Service part / kit	Amazon eBay
132-0331	Cap-Heater Tube (Not Shown)	1	Service part / kit	Amazon eBay $9.95
132-0412	Cap-Heater Tube (3/4) (Not Shown)	1	Service part / kit	Amazon eBay
140-3267	Box, Air - Adapter (Used on Generator Sets with F172 or F173 Enclosure)	1	Service part / kit	Amazon eBay
150-2808	Woodward Governor Throttle		Service part / kit	Amazon eBay
155-3719	Cover-Exhaust (Not Shown)	1	Service part / kit	Amazon eBay
332-1389	Tie, Cable	1	Service part / kit	Amazon eBay
505-0004	Nipple, Pipe (1.0 x 1.50)	1	Service part / kit	Amazon eBay
512-0250	Pulley (Smooth Idler)	1	Service part / kit	Amazon eBay $216.15
512-0251	Pulley (6 Groove Idler)	1	Service part / kit	Amazon eBay
517-0289	Plug, Hole	1	Service part / kit	Amazon eBay
520-1026	Stud-EXH Manifold	20	Service part / kit	Amazon eBay
525-0304	Onan Green Enamel (Non-Metallic) - Gallon Can	1	Service part / kit	Amazon eBay
525-0305	12 oz. Pressurized Spray Can	1	Service part / kit	Amazon eBay
525-0306	Onan Green Enamel (Non-Metallic) - Quart Can	1	Service part / kit	Amazon eBay
526-0174	Clamp, Muffler (1.50")	1	Service part / kit	Amazon eBay $9.95
526-2080	Washer, Flat (M6)	4	Service part / kit	Amazon eBay FridayParts $260.00
526-2100	Washer, Flat (M8)	2	Service part / kit	Amazon eBay
800-2089	F lywhee 1 Screw, Cap - Hex !-lead (M1O X 45~) Grille, Air Outlet Screw, Socket Head (1/4-20 x 1/4')	1	Service part / kit	Amazon eBay
818-0237-01	Rivet, Pop (3/16)	7	Service part / kit	Amazon eBay
821-6003-02	Screw, Cap - Hex Head	2	Service part / kit	Amazon eBay
862-0001	Nut, Hex (1/4-20)	2	Service part / kit	Amazon eBay $19.72
865-0020	Nut, Wing	1	Service part / kit	Amazon eBay $24.16
928-0615C	Generator Set GGHG/GGHH		Service part / kit	Amazon eBay
928-0617	PowerCommand 2100 Controller	5	Service part / kit	Amazon eBay
A026J009	Woodward Air Fuel Control Valve (AFC)		Service part / kit	Amazon eBay
A034E251	Woodward Governor Throttle service kit - US (EPA Compliant) generators	1	Service part / kit	Amazon eBay
A034T573	Woodward AFC service kit - US (EPA Compliant) generators	1	Service part / kit	Amazon eBay
A034T575	Woodward AFC service kit - Export (Non-EPA Compliant) generators		Service part / kit	eBay
A034T577	Woodward Governor Throttle service kit - Export (Non-EPA Compliant) generators		Service part / kit	eBay
F8JL-8A500-AA	5/8 inch cap, rear tube		Service part / kit	eBay
F8JL-8A500-BA	3/4 inch cap, front tube (if used)		Service part / kit	eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

Rating	Load	L/h	gal/h
Prime	2%	268.7	7.6
Prime	3%	354.2	10.0
Prime	4%	439.7	12.4
Prime	100%	183.2	5.2
Standby	2%	703.4	185.82
Standby	3%	938.2	247.85
Standby	4%	1173.0	309.87
Standby	25%	19.1	5.05
Standby	50%	28.0	7.4
Standby	75%	36.8	9.72
Standby	100%	45.7	12.07

Available documents

Spec 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)