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

Service parts for the HDKC

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

Air intake

1 required

A030Y328Air filter$17.99Amazon

Fuel system

1 required

0149-2661Fuel filter$21.95eBay

Oil system

1 required

0122-0386Oil filtersee priceeBay

Belts

1 required

143-2095Beltsee priceAmazon

Cooling system

1 required

143-2078Coolant filtersee priceAmazon

Ignition

1 required

0167-1638Spark plug$11.95eBay

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

Specifications

Fuel	Diesel
Frequency	60.0 Hz
Standby power	10 kW
Prime power	250 kW
Controller	EC-AGS+
Oil capacity	5.6 L
Voltage options	120/240 V
Phase	1
Rated current	41.7 Amps A
Power factor	1.0
Circuit breaker	2-pole, 45 Amp A
Battery cranking	475 Amps down to -17 C (0 F); 650 Amps down to -29 C (-20 F) CCA
Battery voltage	12 Volts V
Battery quantity	1
Coolant capacity	6.2 liters (6.6 qt) L
Dimensions (L×W×H)	1051×622×685 mm
Dry weight	348 kg
Wet weight	348 kg
Sound level	70.0 dBA @ 3 / 15 m
Tank runtime	0.45 hr

Maintenance & consumables

Item	Spec	Capacity	Part #	Interval
Air filter			A030Y328	3000 hr	Amazon $17.99 eBay $30.43
Fuel filter	Replace Fuel Filter		0149-2661	1500 hr	Amazon eBay $21.95
Oil filter			0122-0386	3000 hr	eBay
Battery	cables and terminals		—	1500 hr
Belt	Belt		143-2095		Amazon eBay
Coolant		6.2 quart	—	1500 hr
Coolant filter	Coolant Filter		143-2078		Amazon eBay
Oil	cable size per Table 5-1	5.9 l	—	250 hr
Spark plug			0167-1638	3000 hr	Amazon eBay $11.95

Service intervals

Item	Action	Hours	Months	Notes
Battery and Battery Connections	Check	8 hr		Every Day or Every 8 Hours
Engine Coolant Level	Check	8 hr		Every Day or Every 8 Hours
Engine Oil Level	Check	8 hr		Every Day or Every 8 Hours
General Inspection	Inspect	8 hr		Every Day or Every 8 Hours
Genset service (first service interval, all models)	Other	50 hr		First service — First service interval is 50 hours for all models.
Genset service — GEN TYPE GAS RV (Camp Power)	Other	150 hr		EC-30 service hour meter interval
Genset service — GEN TYPE GAS/LP (Marquis, Microlite, Micro Quiet)	Other	150 hr		EC-30 service hour meter interval
Genset service — GEN TYPE QD 5.5 (Quiet Diesel; model HDKBx)	Other	150 hr		EC-30 service hour meter interval
Genset service — GEN TYPE QD 6/8 (Quiet Diesel; model HDKAx)	Other	150 hr		EC-30 service hour meter interval
genset service	Other	250 hr		First service — GEN TYPE QD 7.5/8 (Quiet Diesel, HDKAx) Service IN hours
Engine Air Filter	Replace	250 hr		Perform more often in dusty conditions
Engine Oil & Oil Filter	Change	250 hr		First service — Every 250 Hrs; perform at least once a year; perform more often in hot/dusty conditions
Fuel Filter	Replace	250 hr		Perform at least once a year
Genset service — GEN TYPE QD 10/12 (Quiet Diesel; models HDCAx, HDKCx)	Other	250 hr		EC-30 service hour meter interval
Spark Arrestor	Clean	250 hr		Perform at least once a year
Coolant Pressure Cap	Replace	500 hr		Perform at least once every two years
Coolant System	Drain	500 hr		Flush Coolant System; perform at least once every two years
Engine Valve Lash	Adjust	500 hr		Must be performed by trained/experienced personnel
Fuel Injector Pressure	Check	1500 hr		EPA requirement; trained personnel only
Generator Slip Rings / Brushes	Check	1500 hr		Perform more often in dusty conditions; trained personnel only
V-Belt & Coolant Hoses	Replace	1500 hr		Perform at least once every five years; trained personnel only
Generator Bearing	Replace	3000 hr		Trained personnel only
Battery & Battery Connections	Check		1 mo	Every Month; perform more often in hot weather
Engine Oil and Oil Filter	Change			First service — After First 50 Hours (footnotes 1,2,3: perform more often in hot weather/dusty environments; perform at least once a year); also recurs later per schedule table

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
Injection timing	Fuel Injection Timing (BTDC)	14.25°
Injection timing	Fuel Injection Timing (BTDC)	14.5	degrees
Other	AUTO GEN disabled if safety input not verified	30	days
Other	Compression Ratio	23.0:1
Other	Dimensions L x W x D	80.98 x 130.12 x 30.48	mm (3.188 x 5.125 x 1.20 inches)
Other	EC-AGS+ gateway dimensions	120 x 108 x 38	mm
Other	Genset off delay with no run request	10	minutes
Other	Minimum genset run time in automatic modes	10	minutes
Other	Quiet Time pre-fill genset start	2	hours prior to beginning of Quiet Time
Other	Safety input re-verify prompt	25	days	display flashes the SAFETY OFF & ON screen
Other	Temperature sensor dimensions	51 x 70 x 17	mm
Other	Time @ START V range	5-60	seconds	default value is 15 seconds
Other	Time @ STOP V range	1-60	minutes	default value is one minute
Other	Typical current draw	47	mA @ 12V
Pressure	Cooling System Pressure Cap	14	psi
Pressure	Cylinder Compression Test	2.55	mPa (370 psi) minimum
Pressure	Cylinder Compression Test	2.55 MPa (370 psi) minimum
Pressure	Cylinder Compression Test	370	psi minimum
Pressure	Exhaust Back Pressure (full load, max)	51	mm (2 in) water column	measured within 153 mm (6 in) of muffler outlet flange
Pressure	Fuel Injection Timing (BTDC)	14.25	degrees
Pressure	Fuel Nozzle Injection Pressure	13.731	mPa (1991 psi)
Pressure	Fuel Nozzle Injection Pressure	13.731 MPa (1991 psi)
Pressure	Fuel Nozzle Injection Pressure	1991	psi
Pressure	Low Oil Pressure Shutdown	14	psi (97 kPa)	3 seconds, switch closed
Resistance	Gateway harness continuity maximum resistance	10	Ohms	repair or replace harness if greater
Temperature	EC-AGS+ gateway operating temperature range	-40 to 70	°C
Temperature	Engine Over Temperature Shutdown	239	F (115 C)	10 seconds
Temperature	Operating temperature	-20 to 70	degrees C (-4F to 158F)
Temperature	Storage temperature	-40 to 70	degrees C (-40F to 158F)
Temperature	Temperature sensor operating temperature range	-40 to 85	°C
Torque	Generator Set Mounting Screws (Grade 5 3/8-16 NC, qty 4)	41	Nm (35 ft-lbs)
Torque	Negative (-) Battery Cable Terminal	9-12	Nm (7-9 ft-lbs)
Torque	Oil Drain Plug (22 mm Hex Head Bolt)	43.39 Nm (32 ft-lbs)
Torque	Positive (+) Battery Cable Terminal	9-12	Nm (7-9 ft-lbs)
Valve clearance	Intake and Exhaust	0.18 to 0.22 mm (0.0071 to 0.0087 in)		cold
Valve clearance	Valve Lash: Intake & Exhaust	0.0071 to 0.0087	in	cold
Valve clearance	Valve Lash: Intake and Exhaust	0.18 to 0.22	mm (0.0071 to 0.0087 in)	cold
Voltage	Automatic modes not allowed below house battery voltage	9	volts
Voltage	Battery system	12	Volt DC
Voltage	EC-AGS+ nominal operating voltage	12	V	nominal
Voltage	EC-AGS+ operating voltage range	8 to 16	VDC
Voltage	House battery voltage — 12V AGM, 100% state of charge	12.9	volts	open circuit, rested 24 hours
Voltage	House battery voltage — 12V gelled, 100% state of charge	12.8	volts	open circuit, rested 24 hours
Voltage	House battery voltage — 12V liquid electrolyte, 100% state of charge	12.6	volts	open circuit, rested 24 hours
Voltage	Minimum house battery voltage for AGS use	9	V	AGS not allowed below this
Voltage	START @ V range	10.5- 12.5	volts	default value is Auto (starts when one bar is displayed)
Voltage	STOP @ V range	13.2-14.5	volts	default value is Auto (stops when three bars are displayed)
Voltage	Temperature sensor battery replacement threshold	2.5	V	replace when below
Voltage	Voltage range	8 - 35	VDC
Voltage	Voltage range	8 – 35	VDC

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	50/50 ethylene glycol antifreeze / distilled water		above -37°C	6.6 quart	Suitable for temperatures down to -34 F (-37 C)
Coolant	Ethylene glycol antifreeze, 50/50 mixture		above 37°C	6.2 liters (6.6 qt)	Fully formulated with rust inhibitors and coolant stabilizers, mixed with fresh distilled water
Engine oil	SAE 15W-40 (multi-grade recommended for year-round use)	API CF, CF-4, CG-4, CH-4 or CI-4		5.9 quart	CF, CF-4, CG-4, CH-4 or CI-4 required with low/ultra-low sulfur fuel in emissions-regulated areas; CF class recommended for high sulfur fuel in non-regulated areas (change oil/filter twice as often)
Engine oil	SAE 30 (OnaMax)	API SJ, SH or SG, may be in combination with CH-4, CG-4 or CF-4	above 0°C	5.6 liters (5.9 qt)	0 C (32 F) and higher
Engine oil	15W-40 (OnaMax)	API SJ, SH or SG, may be in combination with CH-4, CG-4 or CF-4	12°C to 38°C		-12 to 38 C (10 to 100 F)
Engine oil	10W-30 / 10W-40	API SJ, SH or SG, may be in combination with CH-4, CG-4 or CF-4	18°C to 27°C		-18 to 27 C (0 to 80 F)
Engine oil	5W-30	API SJ, SH or SG, may be in combination with CH-4, CG-4 or CF-4	28°C to 10°C		-28 to 10 C (-20 to 50 F)
Fuel	Bio-diesel B5-B20 blend	ASTM D7467 (blend); ASTM D6751 or EN14214 (bio-diesel component); ASTM D975 (petroleum diesel component)			Fuel tanks must be aluminum, steel, fluorinated polyethylene, fluorinated polypropylene, or Teflon (PTFE); bio-diesel compatible fuel water separator required; not recommended for emergency standby/low annual hour use
Fuel	Diesel Grade 1-D or 2-D, S500 or S15	ASTM D975 or EN 590			Minimum Cetane Rating 45 (50 below -4F/-20C or above 5000 ft/1500m); B5 Bio-Diesel suitable; sulfur content max 10,000 ppm (1.0% weight)
Fuel	No. 2 diesel (ASTM 2-D) above freezing; No. 1 diesel (ASTM 1-D) below freezing	Cetane number of at least 45			B5 biodiesel suitable; B5-B20 blends require ASTM D7467 (bio-diesel component ASTM D6751 or EN14214, petroleum diesel component ASTM D975) and additional OEM conditions

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
1	Engine Over Temperature	Engine coolant temperature exceeded 115 C (239 F) for 10 seconds	Shutdown	Check coolant level and leaks; remove blockage from air inlet/outlet and clean radiator; run fewer appliances
12	Over Voltage	Control is unable to maintain rated voltage	Shutdown	See an authorized Onan dealer
13	Under Voltage	Control is unable to maintain rated voltage	Shutdown	Turn off line circuit breaker; run with fewer connected loads
14	Over Frequency	Engine governor is unable to maintain rated frequency	Shutdown	Contact local dealer or distributor
15	Under Frequency	Engine governor is unable to maintain rated frequency	Shutdown	Reduce load
19	Governor Actuator	Control sensed an open or shorted circuit	Shutdown	See an authorized Onan dealer
2	Low Oil Pressure	Low oil pressure cutoff switch did not open	Shutdown	Check oil level, add oil, repair leaks; drain excess oil if above Full
22	Governor Actuator Overload	Duration of operation is near full-duty cycle beyond design limit	Shutdown	Reduce load; check air filter element; check exhaust system for blockage
24	Faulty Engine Temperature Sender	After 10 minutes of normal operation the Controller sensed an open temperature sender/harness	Shutdown	See an authorized Onan dealer
27	Voltage Sense	The Controller lost VAC sensing during normal voltage regulation when field was functioning normally and frequency was at least 40 Hz	Shutdown	See an authorized Onan dealer
29	High Battery Voltage	Voltage across battery system is greater than 19 Volts	Shutdown	Check battery bank connections for parallel (12V) rather than series (24V); select lower booster charge rate
3	Service Check	See second-level fault code (flashed via STOP/PRIME)	Shutdown	Press STOP/PRIME to flash 2-digit service fault code
32	Starting Fault	The Controller could not detect cranking speed (quadrature zero crossings) for 12 seconds	Shutdown	Run propulsion engine while starting; service battery; change oil to proper viscosity
35	EE Checksum Fault	Microprocessor EEPROM error occurred during self test	Shutdown	See an authorized Onan dealer
36	Mechanical Fault	The Controller declared this fault because engine speed fell below 1000 RPM for 0.5 seconds, though not by Controller action	Shutdown	Check fuel level, prime fuel system; check air filter element; check for mechanical damage
38	Over Current (Field Overload)	Low power factor loads	Shutdown	Reduce load; have appliances checked for proper operation
4	Over Crank	First-level fault code - cranking time exceeded 35 seconds	Shutdown	Check fuel level, prime fuel system; check air filter element; replace engine oil with proper viscosity; check fuel fittings; replace fuel filter
41	Generator Rotor Short	While field flashing during cranking, the Controller sensed the rotor circuit was shorted to ground	Shutdown	See an authorized Onan dealer
42	ROM Fault	Microprocessor ROM error occurred during self test	Shutdown	See an authorized Onan dealer
43	RAM Fault	Microprocessor RAM error occurred during self test	Shutdown	See an authorized Onan dealer
45	Speed Sense Lost	Control is unable to sense quadrature frequency	Shutdown	See an authorized Onan dealer
48	Loss of Field Sense	The field sense circuit on the Controller circuit board failed during normal voltage regulation	Shutdown	See an authorized Onan dealer
57	Overprime	The local or remote control switch was held in the Prime position for more than 3 minutes	Shutdown	Check for and remove any object holding the control switch in the prime position

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

Procedures

Setting GEN TYPE adjustment

⚠ GEN TYPE sets the service interval for service messages and critical automatic starting parameters.

Navigate to the SETUP & INFO display and press ENTER.
Navigate to the SETUP GENSET display and press ENTER; the GEN TYPE is displayed.
Press SET; the display will flash.
Use the UP/DOWN key to select the GEN TYPE and press ENTER when the appropriate type is displayed.

Setting Quiet Time (QT) Start & End adjustment

⚠ QUIET ON mode prohibits the genset from automatically starting between the start and end of Quiet Time.

Use the UP/DOWN key to navigate to the QT START or QT END display; the current setting is shown.
Press SET to change the setting.
Use the UP/DOWN key to change the value.
Press ENTER to store the new time.

Setting Safety Type adjustment

⚠ If it has not been setup (SafeType NONE), automatic operation will not be allowed.

Use the UP/DOWN key to select the correct type of safety input: Ignition, Brake, or Park.
Press ENTER to store in permanent memory.

Setting the Hour-Meter adjustment

If the EC-20 is installed on an existing genset, check its hour-meter and record the reading.
ENTER the SETUP & INFO menu and navigate to the SETUP GENSET display.
Press ENTER and use the DOWN key to select the SET gen hours display.
Press SET; the next display says ENTER to unlock; press ENTER to continue.
Hold down UP/DOWN and scroll until the left most digit matches the desired value.
Release UP/DOWN and wait four seconds for the underline to move to the next digit to the right, then scroll to its desired value.
Set each successive digit to the right until the correct genset hours are displayed and press ENTER.

Setting the Hour-Meter (SET Gen Hour) adjustment

⚠ ENTER to unlock prevents unauthorized changes to the hour-meter.

Check the hour-meter on the genset and record the reading.
Enter the SETUP & INFO menu and navigate to the SETUP GENSET display; press ENTER.
Use the DOWN key to select the SET Gen hour's display; press SET.
Press ENTER at the ENTER to unlock display to continue.
Hold down the UP/DOWN key and scroll until the left-most digit matches the desired value.
Release the UP/DOWN key and wait four seconds for the underline to move to the next digit; scroll to its desired value.
Set each successive digit to the right until the correct genset hours are displayed, then press ENTER to store.

Hot Air Recirculation Test diagnostic

⚠ Exhaust gas is deadly

Tools: thermocouples (24 AWG or lighter)

Complete a representative installation
Conduct test in well-ventilated space protected from cross drafts
Connect large constant load (at least 3/4 full load if load bank available)
Measure temperatures with thermocouples not heavier than 0.21 mm2 (24 AWG)
Measure generator set intake air temperature 25.4 mm (1 in) from radiator face
Measure ambient air temperature within 1.2 m (4 ft) of generator set, shielded from sun/discharge air
Close all compartment doors, run generator set at least 90 minutes, record temperatures at 15 minute intervals

Run Gen Test diagnostic

⚠ The sequence can only be interrupted by manually stopping the genset using the STOP switch.

Verify the location is safe for running the genset and that its installation is completed.
Navigate to the display that says ENTER to Run Gen and press ENTER.
The EC-30 goes through a complete start and stop sequence and displays results as the test happens.
When the test is complete the display says Gen Ok ENTER; press ENTER to exit back to ENTER to Run Gen.

Test Procedure diagnostic

⚠ Disable AGS by disconnecting battery or genset remote harness before servicing.

Reconnect the genset negative (-) battery cable.
Insert the fuse in the fuse holders for Wire #7 8-35VDC Power, Wire #8 House Battery Sense, and Wire #9 Engine Battery Sense.
Refer to the Setting Up section and select the genset type.
Set the hour-meter if the EC-30 is installed on an existing genset; skip this step on a new genset.
Start and stop the genset using the Stop/Start switch located at the genset to confirm genset operation.
Start the genset at the EC-30 and check the Start/Stop indicator light flashes while cranking (units with diagnostics only).
Confirm the genset starts and continues to run, and that the Start/Stop indicator light remains illuminated while running.
Scroll to the Hour Meter display and confirm it is operating.
Scroll to the Volt Meter display and confirm it is operating.
Stop the genset at the controller and check that the genset stops, the indicator light turns off, and the Hour Meter stops.
Use the TEST SYSTEM displays to sequentially test all inputs and outputs.
Set the clock to the current local time.

Testing Shore AC Present diagnostic

⚠ Do not connect 120VAC or 240VAC line voltage to the EC-30! It will be damaged and will not be covered by warranty.

Be sure the Shore AC is disconnected and do not do this test with the genset running.
Navigate to the Shore AC Present display and press ENTER; the display says Turn On Shore AC.
Plug the shore AC back in or turn the breaker on; the display changes to read AC Ok ENTER.
Press ENTER to exit the test.

Troubleshooting the EC-30 diagnostic

⚠ Improper service or replacement of parts can result in severe personal injury, death, and/or equipment damage.

Tools: Voltmeter

Determine if the genset operates correctly from the genset controls; if not, the problem is in the genset, not the EC-30.
Confirm the correct connection diagram (Figures 5, 6 and 7) was used, then check EC-30 wiring connections.
Confirm that the correct voltages are present on each terminal.
Check all terminal connections on both ends of the wiring harness and confirm harness connectors are properly joined.
Repeat the TEST SYSTEM procedure as described in the manual.

Verify the Safety Input diagnostic

⚠ If the safety input is not verified by day 30, AUTO GEN is disabled.

Press the AUTO GEN key; the EC-30 requests verification of the SAFETY (IGNITION, PARK or BRAKE) input.
Turn on or off the appropriate safety input signal (ignition, transmission position, park brake or trailer brake).
Press ENTER only if the genset is in a safe location for automatic operation.

AC Power Output Connections - Wiring Methods installation

⚠ Improper wiring can cause fire or electric shock

Have a qualified electrician supervise and inspect all AC wiring installation
Secure only one lead at each AC output terminal (terminals suitable up to No. 6 AWG)
Install vibration-proof switches and controls
Use rain-tight conduit, conduit connectors and junction boxes for exterior wiring
Provide GFCIs for all convenience power receptacles
Route AC wiring, remote control wiring, and fuel lines separately
Seal all conduit openings into vehicle interior with silicone rubber or equivalent sealant
Connect grounding terminal TB2-4 per applicable codes

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

Voltage reconnection

Voltage	Connection	Leads	Notes
	AC Present + positive	#14	Positive input for shore AC present sensing; do not connect 120VAC or 240VAC line voltage.
	AC Present - ground	#13	Supplied by UL Listed 120VAC to 12-16VAC transformer, or the 12VDC ground side of a UL Listed 120VAC to 12VDC plug-in power supply.
	Battery ground (negative)	#1	Supplies the ground or negative side of the circuit for the EC-30; must be supplied from the genset.
	Genset status light	#6	Diagnostic output that flashes the red light in the START/STOP switch to indicate a genset fault; decoded to a text fault message.
	Pin A	Battery Ground	10-pin remote control connector
	Pin B	Status Light	10-pin remote control connector
	Pin C	Start/Preheat	10-pin remote control connector
	Pin D	Not Used	10-pin remote control connector
	Pin E	Stop/Prime	10-pin remote control connector
	Pin F	Hour Meter	10-pin remote control connector
	Pin G	Not Used	10-pin remote control connector
	Pin H	Not Used	10-pin remote control connector
	Pin J	Service Tool	10-pin remote control connector
	Pin K	Service Tool	10-pin remote control connector
	Start/preheat	#3	Supplies the start/preheat signal to the genset; controlled by the STOP/START switch and, in automatic mode, by the EC-30.
	Stop output	#2	Active low or grounded output to the genset; controlled by the STOP/START switch and, in automatic mode, by the EC-30.
	Switched B+ from genset	#5	Switched to battery positive voltage when the genset is running; provides genset hour meter and running indication.
12	Request HVAC active low	#4	Active low or ground input; requires a transition from +12V to ground to activate the auto-gen start function.
12	Run request HVAC #1	#10	Must supply +12V to the controller when the HVAC system requires the genset to run.
12	Run request HVAC #2	#11	Used with a second HVAC unit; must supply +12V to the controller when the HVAC system requires the genset to run.
12	Run request HVAC #3	#12	Used with a third HVAC unit; must supply +12V to the controller when the HVAC system requires the genset to run.
12	Safety input +12V	#16	Positive input to the safety circuit; treat like a relay coil input or light bulb; if supplied with a negative input connect #16 to +12V.
12	Safety input - negative	#15	Voltage across the input must change from 0VDC to 12VDC or 12VDC to 0VDC when the vehicle is parked; if supplied with a positive input connect #15 to negative.
12-24	Engine battery sense	#9	Optional; positive sense voltage for the engine starting battery; connect directly to the battery; 5A inline fuse.
12-24	House battery sense	#8	Positive sense voltage used for the house battery voltage display and state-of-charge indicator; connect directly to the battery; 5A inline fuse.
8-35	Power + (VDC)	#7	Positive power supply to the EC-30; must be protected by a 5A inline fuse located as close to the battery or source as possible.

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 Cummins/Onan HDKC?

The Cummins/Onan HDKC is rated 10 kW standby.

What fuel does the Cummins/Onan HDKC use?

The Cummins/Onan HDKC runs on Diesel.

What oil filter fits the Cummins/Onan HDKC?

The Cummins/Onan HDKC uses oil filter part number 0122-0386.

Which fuel filter part number does the Cummins/Onan HDKC take?

The Cummins/Onan HDKC uses fuel filter part number 0149-2661.

Which air filter part number does the Cummins/Onan HDKC take?

The Cummins/Onan HDKC uses air filter part number A030Y328.

Troubleshooting

Fault codes

Code	Meaning
Code 1	Engine Over Temperature
Code 2	Low Oil Pressure
Code 3	Service Check
Code 4	Over Crank
Code 12	Over Voltage
Code 13	Under Voltage

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan HDKC troubleshooting guide (64 entries) →

Parts

Part #	Description	Qty	System
0122-0386	Oil Filter	1	Oil filter	eBay
0122-0893	Filter, Oil	1	Oil filter	eBay
0140-3071	Filter, Air	1	Air filter	eBay FridayParts $16.50
0140-3116	Element, Air Cleaner	1	Air filter	Amazon eBay $9.95
0140-3351	Element, Air Cleaner	1	Air filter	eBay
0147-0860	Fuel Filter, EFI	1	Fuel filter	Amazon eBay $16.99
0149-2513	Filter, Fuel	1	Fuel filter	eBay $24.00
0149-2629	Fuel Filter, Gasoline	2	Fuel filter	eBay
0149-2637	Fuel Filter, LPG	1	Fuel filter	eBay
0149-2661	Fuel Filter	1	Fuel filter	Amazon eBay $21.95
0167-1638	Spark Plug	1	Spark plug	Amazon eBay $11.95
0167-1652	Spark Plug	1	Spark plug	Amazon eBay
0185-7444	Filter, Oil	1	Oil filter	eBay
0187-1000	Filter, Oil	1	Oil filter	eBay
143-1769	Air Filter Element	1	Air filter	Amazon eBay $105.00
143-2058	Oil Filter	1	Oil filter	Amazon eBay
143-2069	Fuel Filter	1	Fuel filter	Amazon eBay
143-2078	Coolant Filter	1	Coolant filter	Amazon eBay
143-2095	Belt	1	Belt	Amazon eBay
143-2108	Spark Plug	1	Spark plug	Amazon eBay
500-4040	OUTLINE DRAWING		Outline drawing	Amazon eBay
630-2676	CONTROL SCHEMATIC		Control schematic	Amazon eBay
981-0641	Outline Drawing		Outline drawing	Amazon eBay
A030Y328	Filter, Air	1	Air filter	Amazon $17.99 eBay $30.43
TB2-4	Grounding terminal		Grounding terminal	Amazon eBay FridayParts $28.59
0212-1285	Block, Brush	1	Service part / kit	eBay
0212-1285-S0	Block, Brush	1	Service part / kit	eBay
0212-1303	Block, Brush	1	Service part / kit	eBay $75.00
981-0174B			Service part / kit	Amazon eBay
981-0541		1	Service part / kit	Amazon eBay
981-0641B			Service part / kit	Amazon eBay
A043H188	Brush Block	1	Service 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.

Fuel consumption

Rating	Load	L/h	gal/h
Full-load		1.2	4.5
Full-load	100%	3.8	14.0
Full_load		3.0	0.78
Full_load	100%	3.0	0.78
Half-load		0.48	1.8
Half-load	50%	1.8	6.7
Half_load		2.0	0.54
Half_load	50%	2.0	0.54
No-load		0.4	1.8
No_load		1.2	0.33
Prime		1.82	0.48
Standby		0.41	0.11
Standby		1.2	0.33
Standby	50%	2.0	0.54
Standby	100%	3.0	0.78

Available documents

Operator's manual (Cummins/Onan)Operator's manual — 981-0173 Onan HDKCA HDKCB Mobile Diesel Genset Operators manual (01-2009) (Cummins/Onan)Owner's manual — 42345 Owners Manual (Cummins/Onan)Owner's manual — Onan-EC-AGS Manual (Cummins/Onan)Service manual (Cummins/Onan)Service manual — 0981-0173 I10 201304 (Cummins/Onan)Service manual — 0981-0640 (Cummins/Onan)Service manual — 900-0541B-energy-command-operation (Cummins/Onan)Service manual — 900-0543 Onan Energy Command 20 Operators Installation (1-2006) (Cummins/Onan)Service manual — 981-0173B Onan HDKCA HDKCB Mobile Diesel Genset Operators manual (10-2006) (Cummins/Onan)Service manual — 981-0174B Onan HDKCC HDKCD Mobile Diesel Genset Operators manual (10-2006) (Cummins/Onan)Service manual — 981-0640 Onan HDKCA HDKCB Mobile Diesel Genset Install manual (08-2004) (Cummins/Onan)Service manual — 981-0640B Onan HDKCA HDKCB Mobile Diesel Genset Install manual (10-2006) (Cummins/Onan)Service manual — 981-0641 Onan HDKCC HDKCD Mobile Diesel Genset Install manual (08-2004) (Cummins/Onan)Service manual — 981-0641B Onan HDKCC HDKCD Mobile Diesel Genset Install manual (10-2006) (Cummins/Onan)Service manual — A043D713 (Cummins/Onan)Service manual — A043D717 (Cummins/Onan)Service manual — HDKCA, HDKCB, HDKCC, HDKCD, HDKCG Service Manual (Cummins/Onan)Service manual — a043d715-i8-hdkcx-ops-manual (Cummins/Onan)Service manual — a043m526-i13-hdkcx-service-manual (Cummins/Onan)