Cummins/Onan HDKA — Specs, Engine, Parts & Maintenance

Service parts for the HDKA

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

Air intake

1 required

140-2897Air filter$19.99eBay

Fuel system

1 required

7000037500Fuel filtersee priceAmazon

Oil system

1 required

122-0833Oil filter$9.64NAPA

Belts

1 required

511-0235Beltsee priceAmazon

Cooling system

1 required

F245-1003Coolant filtersee priceAmazon

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	6 kW
Controller	DC Controls - 12-Volt System, EC-AGS+, Inverter)
Oil capacity	4.25 L
Alternator	Brushless, Exciterless, Bearingless, Permanent Magnet Alternator
Voltage options	120 V
Phase	1
Rated current	50.0 A
Power factor	1.0
Circuit breaker	30 A
Battery cranking	475 CCA
Battery voltage	12 V
Battery quantity	1
Coolant capacity	4.73 L
Max ambient	49 °C
Dimensions (L×W×H)	922×599×566 mm
Dry weight	191 kg
Wet weight	191 kg
Sound level	78.0 dBA @ 3 m

Engine

Cummins/Onan HDKAL

Oil capacity	4.5 L
Coolant capacity	4.73 L
Displacement	1.001 L
Aspiration	Liquid-cooled
Rated speed	1800 rpm

Maintenance & consumables

for the Cummins/Onan HDKAL

Item	Spec	Capacity	Part #	Interval
Air filter	Element, Air Filter		140-2897		Amazon eBay $19.99 FridayParts $48.61
Fuel filter			7000037500		Amazon eBay KuduParts $10.00
Oil filter	Filter, Oil		122-0833		Amazon eBay $19.99 NAPA $9.64 FridayParts $20.19
Battery	425 cold cranking amps, at least 625 CCA if temperature is below 32° F (0° C)		—	1000 hr
Belt			511-0235	1000 hr	Amazon eBay
Coolant	50/50 mixture of ethylene glycol anti-freeze and water, use only a reliable brand that contains rust and corrosion inhibitor	4.73	—	8760 hr
Coolant filter	Coolant Filter		F245-1003		Amazon eBay
Oil	API classification and SAE viscosity grade indicated in the previous section	5.1 L	—	1000 hr
Spark plug			—	2000 hr

Service intervals

Item	Action	Hours	Months	Notes
Air cleaner dust cap	Check	50 hr		Clean if required; footnote 3: perform more often in extremely dusty conditions
Air cleaner dust cap	Clean	8 hr		Clean if required; perform more often in extremely dusty conditions (table footnote 3)
Coolant level	Check	8 hr		Keep recovery tank level between COLD and HOT
Engine oil	Check	8 hr		Daily or after 8 hours
Engine oil level	Check	8 hr	0 mo	Keep oil level between FULL and ADD
Fuel level	Check	8 hr		Every Day/8 Hrs
Generator set	Inspect	8 hr		Footnote 1: check for oil, fuel, cooling and exhaust system leaks; check exhaust audibly and visually with set running
Genset	Inspect	8 hr		Every Day/8 Hrs; check for oil, fuel, coolant and exhaust system leaks
Oil level	Check	8 hr		Every Day/8 Hrs
Battery charging system	Check	100 hr		Weekly or after 50 hours
Battery specific gravity	Check	100 hr		Weekly or after 50 hours
Drive belt tension	Check	100 hr		Visually check belts for evidence of slippage (table footnote 4)
Engine oil	Change	50 hr		First service — Break-in: change engine oil after the first 20-50 hours of operation (RV QG/RV QG RM); perform at least once a year
Genset service (first service interval, all models)	Other	50 hr		First service — First service interval is 50 hours for all models.
Air Cleaner Dust Boot	Clean	100 hr	1 mo	Perform more often in dusty conditions (footnote 5)
Air cleaner element	Clean	100 hr
Antifreeze	Check	250 hr	6 mo	Monthly or after 100 hours
Battery	Check	100 hr	1 mo	See battery manufacturer's recommendations (footnote 2)
Fuel filter water/sediment	Drain	250 hr		Monthly or after 100 hours
V-belt tension	Check	250 hr	6 mo	Every Month/100 Hrs; check for slippage
Water in fuel	Drain	250 hr	6 mo	Every Month/100 Hrs; drain about one cup to remove water and sediment
Air Filter Element	Replace	150 hr		Every 150 hours, more often in dusty conditions
Engine Oil and Filter	Change	1000 hr		First service — Perform more often in dusty conditions; more often in hot weather; at least once a year
Genset service	Other	250 hr		First service — GEN TYPE QD 7.5/8 (Quiet Diesel 7.5/8 kW; model HDKAx)
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
Anti-freeze	Check	250 hr
Crankcase oil and filter	Change	250 hr	6 mo	First service — Perform after first 35 hours of operation on new genset; change crankcase oil every 50 operating hours in extremely dusty conditions
Fuel filter element	Change	500 hr	12 mo	6 months or after 250 hours
Fuel shut-off linkage	Check	500 hr	12 mo	6 months or after 250 hours
Fuel tank sediment	Drain	250 hr	6 mo	Footnote 5: drain one cup of fuel to remove water and sediment
Generator assembly	Clean	250 hr	6 mo	Clean the generator set at least every six months
Generator set brushes	Check	250 hr	6 mo	Brushes inspected for wear and cleaning every six months
Genset service — GEN TYPE QD 10/12 (Quiet Diesel; models HDCAx, HDKCx)	Other	250 hr		EC-30 service hour meter interval
Water/sediment from fuel filter	Drain	250 hr	6 mo
Air Cleaner Element	Change	500 hr	12 mo	Perform more often in dusty conditions (footnote 5)
Coolant Anti-freeze Protection	Check	1000 hr	1 mo	Perform at least once a year
Coolant Anti-freeze Protection	Test	500 hr		Check Coolant Anti-freeze Protection

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	Bore	2.64 inch (67 mm)	inch (mm)
Clearance	Clearance to top of genset compartment	1	inch (25.4 mm)	minimum, including acoustic insulation
Clearance	Compartment opening free area, generator end	200	square inches	minimum
Clearance	Exhaust system distance from combustible material	3	in
Clearance	Fan belt deflection	0.4 (10 mm)	inch	22 pounds (10 kg) finger pressure at middle of belt
Clearance	Genset to bulkhead/other equipment (pusher/suction fan)	6	inches (152 mm)	minimum
Clearance	Minimum clearance between genset and compartment insulation	1	in
Clearance	Minimum clearance exhaust system to combustible material	3	in
Clearance	Minimum space between engine exhaust components and compartment insulation	3	in
Clearance	Muffler/tailpipe to combustible material	3	inches (76 mm)	minimum, unless insulated or shielded
Clearance	Stroke	2.68 inch (68 mm)	inch (mm)
Clearance	V-belt deflection	0.4	inch	with 20 pounds (10 kg) applied to middle of pulley span (10 mm)
Clearance	V-belt deflection at 20 pounds (10 kg) applied to middle of pulley span	0.4 inch (10 mm)	inch	at 20 lbs (10 kg)
Current	Battery charging DC alternator output	30	amp
Current	Starter motor draw at 12 VDC	100	A
Gap	Fan belt deflection	0.4	inch (10 mm)	22 pounds (10 kg) finger pressure at middle of belt
Gap	Fan belt deflection at middle of belt	0.4	inch (10 mm)	finger pressure of 22 pounds (10 kg)
Other	AUTO GEN disabled if safety input not verified	30	days
Other	Actuator speed control lever stop screw (beginning Spec B)	Turn in until just makes contact, then one more full turn (rotor not in place); set locknut		Adjust whenever a different actuator base assembly is installed
Other	Altitude power derate	approximately 3 percent per 1000-foot (305 m) increase in elevation	percent
Other	Battery cable size, total cable length 0 to 10 feet (0 to 3 m)	2	AWG	temperatures down to –20°F (–29°C)
Other	Battery cable size, total cable length 11 to 15 feet (3 to 4.5 m)	0	AWG	temperatures down to –20°F (–29°C)
Other	Battery cable size, total cable length 16 to 20 feet (4.5 to 6 m)	000	AWG	temperatures down to –20°F (–29°C)
Other	Battery compartment ventilation opening	1.7	in2	minimum at top and bottom
Other	Battery compartment ventilation opening	11	cm2	minimum at top and bottom
Other	Battery electrolyte specific gravity (fully charged)	1.260		at approximately 80°F (27°C)
Other	Battery electrolyte specific gravity, charge if below	1.215	specific gravity
Other	Battery electrolyte specific gravity, fully charged	1.260	specific gravity	at 80 F (27 C)
Other	Battery rating	425	CCA
Other	Battery rating	625	CCA	below 32°F (0°C)
Other	Battery recharge threshold (charge if specific gravity less than)	1.215	specific gravity
Other	Battery specific gravity charge threshold	1.215		charge battery if specific gravity is less than this
Other	Battery specific gravity, fully charged	1.260		at 80°F (27°C)
Other	Bore	2.64	inch (67 mm)
Other	Bore	2.99 (76) for HDKAL/HDKAQ; 2.83 (72) for HDKAR/HDKAS	in (mm)
Other	Bore	72	mm
Other	Bore	76	mm
Other	Brush wear limit (wire inserted into brush holder)	1	inch (25 mm)	replace brush and spring if wire enters holder this far or more
Other	Circuit breaker rating	35	A	2 pole, 60 Hz
Other	Clamping screw (beginning Spec B high-idle adjustment)	Run back in by hand until snug, back it out 1-1/2 turns, set lock nut	turns	After setting high-idle speed
Other	Compartment depth	25	in
Other	Compartment height	25	in
Other	Compartment width	38.4	in
Other	Compression Ratio	23 : 1
Other	Compression ratio	23 to 1
Other	Compression ratio	23:1
Other	Continuous operation at up to 80 percent of maximum power	6000	watts	80% of maximum power
Other	Cooling air requirement - Generator Inlet	100	in2
Other	Cooling air requirement - Radiator	200	in2
Other	Cooling system capacity	4.2 quart (4 l)	quart (l)	includes coolant recovery tank
Other	Cooling system capacity	4.73	L
Other	Cranking time that triggers fault	35	seconds	cranking time exceeded fault (4 blinks)
Other	Cranking time that trips fault code 4	35	seconds
Other	Cyclic horizontal forces	±500	lbs	±1 g-force
Other	Cyclic vertical forces	±1500	lbs	±3 g-force
Other	DC alternator output	30	amp	12 Volt Battery Charging
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	Displacement	1001	cm3
Other	Displacement	44	inch3 (719 cc)
Other	Displacement	44 inch3 (719 cc)	inch3 (cc)

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 and water			4.2 quarts (4 liters)	Provides protection to -34°F (-37°C). Use distilled water if available. Replace every 2 years.
Coolant	50/50 ethylene glycol based antifreeze and water				Mix thoroughly before adding; use clean soft tap water, distilled water or pure rain; select high quality antifreeze with corrosion inhibitors
Coolant	50/50 mixture ethylene glycol anti-freeze and water	Contains rust and corrosion inhibitor; no stop-leak additive	above -37°C	4.0 l	4.2 quart (4 l) capacity; suitable down to -34 F (-37 C)
Coolant	50/50 mixture of ethylene glycol anti-freeze and water	Reliable brand with rust and corrosion inhibitor; must not contain stop-leak additive	above -37°C		50/50 provides freeze protection to -34 F (-37 C); use distilled or soft water
Coolant	50/50 mixture of ethylene glycol anti-freeze and water as shipped; use ethylene or propylene glycol anti-freeze solution containing rust and corrosion inhibitor	Anti-freeze must not contain a stop-leak additive; water must be clean, low in minerals and free of corrosive chemicals; use distilled water if available	above -37°C	4.0 l	Factory fill suitable down to -34 deg F (-37 deg C); cooling system capacity 4.2 quart (4 l) includes coolant recovery tank; replace coolant every two years
Coolant	50/50 mixture of ethylene glycol anti-freeze and water; ethylene or propylene glycol solution containing rust and corrosion inhibitor	No stop-leak additive; use clean, low-mineral water, distilled if available	above -37°C	4.0 l	Suitable for temperatures down to -34° F (-37° C); cooling system capacity 4.2 quart (4 l) including coolant recovery tank; replace coolant every two years
Coolant	50/50 mixture of ethylene glycol antifreeze and water		above -37°C	4.0 l	Suitable for temperatures down to –37 °C (–34 °F); antifreeze should be fully formulated with rust inhibitors and coolant stabilizers, mixed with fresh (distilled) water
Coolant	50/50 mixture of water and ethylene glycol		above -37°C		Best quality ethylene or propylene glycol antifreeze fully formulated with rust inhibitors and coolant stabilizers, but not stop-leak additives. Use fresh water low in minerals; distilled water is best. Shipped 50/50 mixture good for -34 F (-37 C).
Coolant	50/50 mixture of water and ethylene glycol (or propylene glycol) antifreeze	Fully formulated with rust inhibitors and coolant stabilizers but not with stop-leak additives; use fresh water low in minerals, distilled best	above -37°C	4.73 L	Shipped with recommended 50/50 mixture, good for -34 F (-37 C); cooling system capacity 1.25 gal (4.73 L)
Coolant	Ethylene or propylene glycol anti-freeze, 50/50 mixture		above -34°C	4.2 quart	Must contain rust and corrosion inhibitor; no stop-leak additives
Coolant	50/50 mixture of water and ethylene glycol (best quality ethylene or propylene glycol antifreeze, fully formulated with rust inhibitors and coolant stabilizers, no stop-leak additives)		above 37°C	4.73 L	Good for -34°F (-37°C); Cooling System Capacity 1.25 gal (4.73 L); use distilled water; replenish recovery tank between COLD and HOT
Coolant	Ethylene glycol antifreeze, fully formulated with rust inhibitors and coolant stabilizers		above 37°C	4.0 l (4.2 qt) incl. recovery tank	50/50 mixture recommended for all climates
Engine oil	CH-4, CG-4, or CF-4	API performance class		3.0 quarts (2.6 liters)	May be combined with SJ, SH, or SG. Select viscosity grade per Chart 1 based on ambient temperature.
Engine oil	SAE 10W-30 / 10W-40 / 0W-30 / 5W-30				Use viscosity chart to select grade for expected ambient temperature range; avoid mixing grades or brands
Engine oil	SAE 15W-40	API CF, CF-4, CG-4, CH-4, CI-4 or CJ-4 (diesel)			OnaMax 15W-40 #326-5336; multi-grade recommended year-round in liquid-cooled engines; synthetic oil not recommended
Engine oil	SAE 15W-40 multi-grade recommended for year-round use	API Class CF-4 or CF or better		4.7 L	Pre-start checks state engine oil capacity 4.7 liters (5 quarts); Specifications state lubricating oil capacity with oil filter 6.0 liters (6.34 quarts). Choose viscosity grade per ambient temperature before next oil change.
Engine oil	SAE 15W-40 multi-grade recommended for year-round use (choose viscosity grade per ambient temperature chart, Figure 2)	API Class CG-4, CF-4, CF or better		4.1 L	Lube oil capacity 4.34 qt (4.1 L) including filter
Engine oil	SAE 15W-40 multi-grade recommended for year-round use; choose viscosity grade for ambient temperature range before next oil change	API Class CF-4 or CF or better		5.1 L	Lube Oil Capacity 5.39 qt (5.1 L); see Figure 2 SAE viscosity grade vs ambient temperature
Engine oil	SAE viscosity grade chosen from Chart 1 (Oil Viscosity vs. Temperature) for ambient temperatures expected until next oil change	API performance Class CH-4, CG-4 or CF-4, may be in combination with SJ, SH or SG (e.g. CH-4/SJ)		2.6 l	3 quart (2.6 l) with filter
Engine oil	SAE viscosity grade per Chart 1 (Oil Viscosity vs. Temperature)	API CH-4, CG-4 or CF-4 (may combine with SJ, SH or SG)		2.6 l	3 quarts (2.6 l) capacity with filter
Engine oil	SAE viscosity grade per Chart 4-1 (oil viscosity vs. temperature)	API performance Class CH-4, CG-4 or CF-4D, may be combined with SJ, SH or SG (e.g. CH-4/SJ)		2.6 l	Oil capacity with filter 3 quart (2.6 l)
Engine oil	SAE viscosity grade per engine lubrication section	API classification per engine lubrication section			Refer to Engine Workshop Manual for oil recommendation
Engine oil	SAE viscosity grade selected per anticipated ambient temperature (Chart 1, Oil Viscosity vs. Temperature)	API performance Class CH-4, CG-4 or CF-4, may be in combination with performance Class SJ, SH or SG (e.g. CH-4/SJ)		3.0 quart (2.6 l)	Oil capacity with filter; change oil if not appropriate for ambient temperatures during break-in
Engine oil	SAE viscosity per anticipated ambient temperature (Table 1, Oil Viscosity vs. Temperature)	API classification CC and later		4.26 liters (4.5 quarts)	Do not use synthetic oil or non-detergent oil. Do not mix different brands of oil. (Specifications section lists lube oil capacity 4.5 qt (4.25 L) including filter.)
Engine oil	SAE-30	API SJ, SL or SM (gasoline)			OnaMax SAE-30 #326-5339; preferred summer grade for optimum oil consumption control in air-cooled engines
Engine oil	Performance Class CH-4, CG-4 or CF-4		-40°C to 40°C	3.0 quart	Select SAE grade based on ambient temperature; see oil viscosity chart
Engine oil	API Class CH-4, CG-4, or CF-4	SAE viscosity grade based on ambient temperature	above -34°C	2.6 l	See Chart 1 for viscosity selection by temperature
Engine oil	5W-30	API CF, CF-4, CG-4, CH-4, or CI-4	-28°C to 10°C
Engine oil	10W-30 10W-40	API CF, CF-4, CG-4, CH-4, or CI-4	-18°C to 27°C
Engine oil	15W-40 (OnaMax)	API CF, CF-4, CG-4, CH-4, or CI-4	-12°C to 38°C		Multigrade oils such as SAE 15W-40 are recommended for year round use

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	One blink	Shutdown due to high engine coolant temperature	Shutdown	Touch Stop to check the second-level fault code; it will be either No. 33 or No. 34.
1, 2, 3, 4	First level faults	First-level faults; avoid interpreting as second-level codes 11, 22, 33, or 44	Shutdown	Pay close attention to the pause sequence
11	Overload Fault	Second-level shutdown code No. 11 (blink once, pause, blink once). Not assigned a first-level fault (avoid confusion with first-level Code 1).	Shutdown	Turn off the genset line circuit breaker; if the genset no longer shuts down, check for and repair a short in vehicle appliances, wiring or shorted battery charger transformer; check whether vehicle engine and genset share the same starting battery and increase battery capacity or install a separate battery.
12	Over Voltage	The control is unable to maintain rated voltage.	Shutdown	If the vehicle engine and genset share a starting battery, increase battery capacity or install a separate battery and charging system for the genset.
13	Under Voltage	The control is unable to maintain rated voltage.	Shutdown	Reduce load (especially air conditioners and battery chargers).
14	Over Frequency	The engine governor is unable to maintain rated frequency.	Shutdown	Reduce the number of connected appliances, especially when air conditioners and battery chargers are running.
15	Underfrequency Fault	The engine governor is unable to maintain rated frequency.	Shutdown	Reduce the number of connected appliances; have air conditioners and other appliances checked for proper operation (a locked compressor rotor can cause very low power factor).
17	Fuel Pump Fault	Controller sensed open circuit; bypassable fault prior to Spec F, discontinued beginning Spec F	Shutdown	Try priming by holding control switch at Stop; reconnect fuel pump leads; test pump on 12 V battery; check P1-2/E2-1 and E2-2/ground continuity.
18	Glow Plug Circuit Protection Fault	Controller sensed short circuit; bypassable fault prior to Spec F, discontinued beginning Spec F	Shutdown	Reconnect HR-1 to glow plug bus bar; check HR-1 and A1-J8 for ground short; replace engine harness or control assembly.
19	Governor Actuator Fault	The control sensed an open or shorted circuit.	Shutdown	See an authorized Onan dealer.
2	Two blinks	Two blinks indicate shutdown due to a loss of engine oil pressure; oil pressure switch actuates below 9 psi (62 kPa)	Shutdown	Check oil level; check switch and wiring; replace switch or service engine if pressure <14 psi (98 kPa).
21	Starter Solenoid Circuit Protection Fault	Controller sensed short circuit; discontinued beginning Spec F	Shutdown	Reconnect K-1 to starter solenoid; test solenoid and starter; reconnect A1-J6; check continuity to ground; replace controller assembly.
22	Not assigned	The duration of operation is near full-duty cycle beyond design limit.	Warning	Step 01 (0.5 hr): check load, air intake restriction, exhaust restriction, air leak in fuel system, stator for opens/shorts. Step 02 (1.0 hr): check fuel flow test, governor for binding, high idle adjustment, injectors, injection pump timing, compression (SRT 00-0BL)
23	Low Oil Pressure Cutoff Switch Fault	Switch still open during start - not a running fault	Shutdown	See an authorized Onan dealer.
24	Throttle Control Fault	Engine throttle control malfunction	Shutdown	See an authorized Onan dealer.
25	Engine Sensor Fault	Governor unable to regulate to target speed.	Shutdown	See an authorized Onan dealer.
26	Engine Below Speed Target Fault	Governor unable to regulate to target speed.	Shutdown	Step 01 (0.5 hr): check loads, air in fuel system, air intake restriction, exhaust restriction. Step 02 (1.0 hr): check binding in the governor, high idle speed, injectors, injection timing, compression (SRT 00-0BQ)
27	Voltage Sense	The control is unable to sense output voltage.	Shutdown	Test with load bank to isolate load; check PMA-to-control connections; measure PMA lead voltages (T1-T2, T2-T3, T3-T1 - should exceed 20 Vrms); troubleshoot rotor/stator; replace control assembly.
28	DC Sense Lost Fault	Controller unable to sense DC bus voltage	Shutdown	Open the circuit breaker; if the fault does not persist, check for and disconnect excessive loads from the genset before starting.
29	High Battery Voltage Fault	Voltage across the battery system is greater than 19 Volts.	Warning	Check battery connections; measure DC voltage; check battery charger; verify ground at P1-7.
3	Three blinks	Three blinks indicate a service fault; press Stop once to blink the two-digit second-level shutdown code (tens digit, pause, units digit)	Warning	Touch Stop to check the second-level fault code; it will be one of the codes in the troubleshooting table.
31	Overspeed Fault	Engine speed greater than 3600 rpm.	Shutdown	See an authorized Onan dealer.
32	Low Cranking Speed Fault	Cranking speed less than 180 rpm for more than 2 seconds; crank and generator frequency less than 3 Hz for greater than 2 seconds	Shutdown	Step 01 (0.3 hr): check fuse, harness connections to starter, battery connections at set and battery, battery voltage at set. Step 02 (0.7 hr): check starter operation, harness connection for opens/shorts, stator resistance for opens/shorts, rotor magnets for failure (SRT 00-0BS)
33	Not assigned	Second-level code 33 has not been assigned a fault	Shutdown	Step 01 (0.5 hr): verify FC is actually a secondary code; verify coolant level and fill if needed; verify engine coolant temperature; air inlet/outlet opening for blockage; excessive coach loads; coolant pump belt for wear; cooling fan for damage; housing air leaks. Step 02 (0.5 hr): check temperature sensor lead for opens/shorts; radiator blockage and clean. Step 03 (2.0 hr): clean and flush coolant system; replace coolant thermostat (SRT 00-0CS)
34	High Inverter Temperature Fault	Inverter heat sink temperature exceeded design limit.	Shutdown	Remove objects blocking the air inlet or outlet openings; reduce the number of appliances connected at the same time.
35	Control Card Fault	Microprocessor EPROM error during self-test.	Shutdown	Verify problem and report to factory (SRT 00-0CA, 0.2 hours)
36	Unknown Shutdown Fault	The engine stopped without receiving a command from the control.	Shutdown	Step 01 (0.3 hr): check fuel level in coach tanks, prime genset fuel system, air filter blockage, mechanical damage. Step 02 (0.5 hr): check auxiliary fuel pump, conduct fuel flow test, P1 and P2 connectors and wiring (SRT 00-0BW)
37	Invalid Genset Configuration Fault	The generator set control is not configured properly for the generator set	Shutdown	Verify problem and report to factory (SRT 00-CHA, 0.2 hours)
38	Overload Fault	Too many loads connected.	Shutdown	Step 01 (0.2 hr): reduce coach loads, cool inverter. Step 02 (1.0 hr): check if set has engine performance issue, fuel supply for sucking air, fuel flow test, governor operates smoothly, high idle speed, current transformer for shorts/opens (SRT 00-0BX)
39	Low Battery Voltage Fault	Prior to Spec F only	Warning	Inspect connections; check fuel/air leaks; avoid cranking propulsion engine; check battery voltage; replace/recharge battery.
4	Overcrank	Set cranked for 35 seconds without starting (speed >1200 RPM) (Begin Spec K)	Shutdown	Troubleshoot as an out-of-fuel condition (see FC36); check fuel flow and return, actuator operation, wiring.
4 blinks	Cranking time exceeded 35 seconds	Status indicator light repeatedly blinks four times	Shutdown	Check fuel supply and priming before re-cranking
41	Generator Rotor	Control unable to sense field or output voltage	Shutdown	Contact local dealer or distributor.
42	Processor Fault	Microprocessor ROM error during self-test; beginning Spec F and replacement controller assemblies	Shutdown	Verify fault code (SRT 00-0CB, 0.2 hours)
43	Processor Fault	Microprocessor RAM error during self-test; beginning Spec F and replacement controller assemblies	Shutdown	Verify fault code (SRT 00-0CC, 0.2 hours)
44	Not assigned	Second-level code 44 has not been assigned a fault	Info
45	Speed Sense	The control is unable to sense quadrature frequency.	Shutdown	Contact local dealer or distributor.
46	Inverter Power Supply Fault	Low battery voltage or power supply device failure; beginning Spec F and replacement controller assemblies	Shutdown	Verify fault code, voltage at set during cranking, voltage at starter during cranking, battery connections at set and battery, battery condition, set charging system if equipped (SRT 00-0BZ, 0.5 hours)
48	Generator Field Sense	The control is unable to sense field voltage.	Shutdown	Contact local dealer or distributor.
57	Over Prime	Priming exceeded 3 minutes.	Shutdown	Check for and remove any object holding either control switch in the STOP/PRIME position.
8	Overload (Models HDKAH & HDKAV only)	Starter or cranking circuit malfunction	Shutdown	Reduce load and restart.
restore	Restoring fault code blinking	Fault code stops blinking after five minutes	Info	Press Stop three times within three seconds to restore fault code blinking

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

Procedures

Adjusting V-Belt Tension adjustment

⚠ Accidental starting can cause severe personal injury or death. Disconnect the negative (−) cable(s) at the battery(ies) before working on the genset.

Disconnect the negative (−) cable(s) at the battery(ies) to prevent the engine from starting and remove the top belt guard.
Loosen the alternator pivot bolt first and then the adjusting bracket bolt on top.
Tighten belt tension by pivoting the alternator outwards; hold tension by tightening the adjusting bracket bolt.
Apply 20 pounds (10 kg) to the middle of the pulley span and measure belt deflection, which should be 0.4 inch (10 mm).
Tighten the alternator bolts when tension is correct.
Secure the belt guard and reconnect the battery cables (negative [−] last).

Fan Belt Adjustment adjustment

⚠ Do not operate the generator set without the belt guard in place.

⚠ Stop the set and disable by disconnecting battery cables before service.

Remove the generator set starting battery cables, negative cable first.
Remove the belt guard from the front of the set.
Loosen the bolt through the long slot in the alternator mounting bracket.
Slide the alternator until the tension is correct.
Check tension: 22 pounds finger pressure deflects belt 0.4 inch.

Governor Actuator Speed Control Lever Stop Adjustment (Spec B and later) adjustment

Loosen the stop screw locknut and back the screw out a few turns.
Turn the stop screw in until it just makes contact.
Turn the screw 1 full turn further in and set the locknut (rotor not in place procedure).
Alternatively with actuator in place: loosen set screw locknut, turn stop screw in until just makes contact, set locknut.

High-Idle Speed Adjustment adjustment

⚠ Do not let engine speed exceed 3600 RPM.

Tools: tachometer

Remove front housing panel.
Set up tachometer.
Remove actuator cover and reattach leads.
Start generator set and push actuator rotor clockwise fully (about 12 mm).
Adjust high-idle speed to 3500-3600 RPM.
For Spec A, adjust screw; for Spec B, adjust screws and set locknut.
Let rotor go; generator should stop and display fault code.
Restart and recheck high idle speed.

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 (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.

Valves − Adjust, All adjustment

Remove and install cover and panels, valve cover
Adjust valve lash
Test run unit

Voltage Adjustment adjustment

⚠ Touching uninsulated live parts can cause severe injury or death.

Tools: voltmeter

Start generator set; allow voltage and frequency to stabilize 3-5 seconds.
Rapidly press Start switch 6 times within first minute to enter voltage adjust mode.
To increase: press and quickly release Start switch; each press increases about 0.6 volts.
To decrease: press and hold Start switch about 1 second; each press decreases about 0.6 volts.
Repeat until desired voltage.
Wait 20 seconds for amber light to stop blinking.
Press Stop switch to save adjustment.

Voltage Adjustment Procedure adjustment

⚠ Do not change the 50/60 Hz setting on the regulator.

⚠ The V/Hz Break Point pot is factory set and sealed; do not adjust.

Tools: flat-blade screwdriver, voltmeter

Attach a voltmeter securely to the L1 and L2 leads.
Start the generator set and place a typical load on its output.
Use a flat-blade screwdriver to set the voltage adjust potentiometer for correct voltage.
Retighten the locking nut when complete.

Voltage Adjustment [G] adjustment

⚠ Disconnect both battery cables, negative (-) cable first, when repairs are made.

⚠ Contact with high voltage can cause severe personal injury or death.

Tools: Voltmeter, Flat-blade screwdriver

Attach a voltmeter securely to the L1 and L2 leads.
Start the generator set and place a typical load on its output.
Use a flat-blade screwdriver to set the voltage adjust potentiometer for correct voltage.
For most 60 Hz applications, the ideal setting is 120 VAC at 60-61 hz.
Retighten the locking nut when complete.

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	Phase	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)	Wire #1	Supplies ground/negative side of the circuit for the EC-20; must be supplied from the genset.
		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	Wire #6	Diagnostic output from the genset that flashes the red light in the START/STOP switch; decoded by the EC-20 to display a text fault message.
		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.
		Not Used	Wire #4
		Start/Preheat	Wire #3	Supplies start/preheat signal to the genset; controlled by the STOP/START switch and in automatic mode by the EC-20.
		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	Wire #2	Active low or grounded output supplying the stop signal to the genset; controlled by the STOP/START switch.
		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	Wire #5	Switched to battery positive when the genset is running; provides genset hour-meter and running signal.
		Switched B+ from genset	#5	Switched to battery positive voltage when the genset is running; provides genset hour meter and running indication.
	single	Quadrature power connection Q60 - 60 Hz, Q50 - 50 Hz units	Q1, Q50, Q60	Note 2: Quadrature power connection Q60-60 Hz, Q50-50 Hz units. Note 3: AVR reference voltage. Note 1: From J2-15 for field flashing.
100	1	Reconnection chart
100	1	reconnection chart
100	single	reconnection chart	L0
100	single-phase			50 Hz; see reconnection chart
100	single-phase	L0, L1	T4, T3, L2, L1, Q50, Q60, T2, T1, S2, 2, S1, Q1
100/200	1	Reconnection chart		Wiring diagram 612-6637 reconnection chart
100/200	1	reconnection chart
100/200	single	As shown	T1, T2, T3, T4; L0(N), L1	100/200 volts only; stator resistance values differ (T1-T2, T3-T4: 0.150 ohm; Q1-Q60: 2.3 ohms)
100/200	single	reconnection chart	L0, L1
100/200	single-phase			50 Hz; see reconnection chart
100/200	single-phase	L0(N), L1	Q50, Q60, T2, T1, S2, 2, S1, Q1	50 Hz
110	1	reconnection chart	T4, T3; L1
110	single-phase	L0, L1	T4, T2, T3, T1, L0
110/190	3	50 HZ CODE Z	T1-T12
110/220	1	As shown	T1, T2, T3, T4	See reconnection chart for other voltages
110/220	1	reconnection chart	T4, T3, T2, T1; L2, L1, L0(N)

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 size generator is the Cummins/Onan HDKA?

The Cummins/Onan HDKA is rated 10 kW standby.

What engine is in the Cummins/Onan HDKA?

The Cummins/Onan HDKA is powered by the Cummins/Onan HDKAL engine.

What kind of fuel does the Cummins/Onan HDKA run on?

The Cummins/Onan HDKA runs on diesel.

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

The Cummins/Onan HDKAL engine in the Cummins/Onan HDKA has an oil capacity of 4.5 liters.

How much coolant does the Cummins/Onan HDKA hold?

The Cummins/Onan HDKA cooling system holds 4.73 liters (1.2 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the continuous rating of the Cummins/Onan HDKA?

The Cummins/Onan HDKA is rated 6 kW prime (7500 kVA), against 10 kW standby.

What is the sound level of the Cummins/Onan HDKA?

The Cummins/Onan HDKA is rated at 78.0 dBA at 3 m, per the manufacturer specification sheet.

How much does the Cummins/Onan HDKA weigh?

The Cummins/Onan HDKA has a dry weight of 191 kg (421 lb).

What voltage does the Cummins/Onan HDKA produce?

The Cummins/Onan HDKA is offered in 120 V, 1-phase.

What battery does the Cummins/Onan HDKA use?

The Cummins/Onan HDKA uses 1 battery, 12 V each, 475 CCA, per the manufacturer specification sheet.

What alternator does the Cummins/Onan HDKA use?

The Cummins/Onan HDKA uses a Brushless, Exciterless, Bearingless, Permanent Magnet Alternator alternator.

What oil filter fits the Cummins/Onan HDKA?

The Cummins/Onan HDKA uses oil filter part number 122-0833.

What fuel filter does the Cummins/Onan HDKA use?

The Cummins/Onan HDKA uses fuel filter part number 7000037500.

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

The Cummins/Onan HDKA uses air filter part number 140-2897.

Troubleshooting

Symptoms & remedies

Symptom	Cause	Remedy
Dizziness		IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired.
Muscular Twitching		IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired.
Vomiting		IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired.
Weakness and Sleepiness		IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired.
Inability to Think Coherently		IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired.
Engine exhaust could ignite grass or brush	Parked in high grass or brush

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan HDKA troubleshooting guide (121 entries) →

Parts

212

Part #	Description	Qty	System
0611-1236	FC32 TS Wiring Diagram	1	Wiring diagram	Amazon eBay
122-0833	Filter, Oil	1	Oil filter	Amazon eBay $19.99 NAPA $9.64 FridayParts $20.19
14-028	Oil Filter	1	Oil filter	Amazon eBay
14-029	Spark Plug	1	Spark plug	Amazon eBay FridayParts $33.99
14-035	Air Cleaner Element	1	Air filter	Amazon eBay
14-036	Fuel Filter	1	Fuel filter	Amazon eBay
140-2897	Element, Air Filter	1	Air filter	Amazon eBay $19.99 FridayParts $48.61
147-0860	Filter, Fuel for HDKAK and HDKAH (Beginning Spec N)	1	Fuel filter	Amazon eBay $19.99 KuduParts $12.00
149-2513	Filter, Fuel	1	Fuel filter	Amazon eBay $36.95 NAPA $31.59 FridayParts $48.61
149-2790	Pump, Fuel	1	Pump	Amazon eBay $98.00 FridayParts $24.89
185-2095	O'Ring	1	Seal	Amazon eBay
185-2284	Gasket	1	Gasket	Amazon eBay
185-2291	Gasket	3	Gasket	Amazon eBay
185-2338	Gasket	1	Gasket	Amazon eBay
185-2411	*Cap, Sealing	1	Seal	Amazon eBay
185-2413	Cap, Sealing	2	Seal	Amazon eBay
185-2461	*Seal, Oil	1	Seal	Amazon eBay $8.99
185-2578	Gasket	1	Gasket	Amazon eBay
185-2884	Gasket	1	Gasket	Amazon eBay
185-5337	Gasket	3	Gasket	Amazon eBay
185-5407	Cover, Oil Fill	1	Fluid	Amazon eBay
185-5433	Pump Assy, Water	1	Pump	Amazon eBay $35.45 FridayParts $44.80
185-5458	Thermostat	1	Thermostat	Amazon eBay
185-5484	Cap, Sealing	4	Seal	Amazon eBay
185-5641	Gasket, Delivery Valve	2	Gasket	Amazon eBay
185-5661	Gasket	2	Gasket	Amazon eBay
185-5663	Gasket	1	Gasket	Amazon eBay
185-5714	*Seal Assy, Mechanical	1	Seal	Amazon eBay
185-5715	Impeller	1	Impeller	Amazon eBay
185-5745	Bolt * −Parts Included in Water Pump Assy.	2	Pump	Amazon eBay
185-5820	Gasket	1	Gasket	Amazon eBay
185-5835	Oil Filter	1	Oil filter	Amazon eBay $21.78 NAPA $3.59 FridayParts $20.19
185-5985	Seal, Heat	3	Seal	Amazon eBay
185-6120	Gasket, Cylinder Head	1	Gasket	Amazon eBay
185-6485	*Rotor, Oil Pump	1	Pump	Amazon eBay
185-6486	*Cover, Oil Pump	1	Pump	Amazon eBay
185-6503	Shield, Breather Oil	1	Fluid	Amazon eBay
185-6510	Seal, Oil	1	Seal	Amazon eBay
185-6511	Gasket, Bearing Case Cover	1	Gasket	Amazon eBay
185-6542	Gear, Oil Pump Drive	1	Pump	Amazon eBay
185-6545	O Ring (Spec A)	1	Seal	Amazon eBay
185-6558	Gear, Injection Pump	1	Fuel pump	Amazon eBay
185-6580	Gasket, Fuel Pump	1	Pump	Amazon eBay
185-6603	Gasket	1	Gasket	Amazon eBay
185-6671	Pump Assy, Water (Includes Parts Marked *)	1	Pump	Amazon eBay $145.00 FridayParts $42.60
185-6672	*Flange, Pump Water	1	Pump	Amazon eBay
185-6674	*Impeller, Pump Water	1	Pump	Amazon eBay
185-6845	Shim, Injection Pump	2	Pump	Amazon eBay
185-6863	Gasket, Gearcase	1	Gasket	Amazon eBay
185-6864	Seal, Oil	1	Seal	Amazon eBay
185-6866	Indicator, Oil Level	1	Sensor	Amazon eBay
185-6868	Gasket, Cylinder Head Cover	1	Gasket	Amazon eBay
185-6882	Assy Pump, Injection	1	Pump	Amazon eBay
185-6884	Plunger, Pump	3	Pump	Amazon eBay
185-6894	Gasket	1	Gasket	Amazon eBay
185-6899	Cord, Glow Plug	1	Glow plug	Amazon eBay
185-6922	Gasket, Water Flange	1	Gasket	Amazon eBay
185-6935	Cover, Thermostat	1	Thermostat	Amazon eBay
185-7242	Gasket Thermostat	1	Gasket	Amazon eBay
185-7299	Gasket, Water Pump	1	Pump	Amazon eBay
185-7300	Seal, Valve Stem	6	Seal	Amazon eBay
185-7313	Gasket * −Parts Included in Governor Lever Assy.	1	Gasket	Amazon eBay
185-7427	Indicator, Oil Level (Exhaust Side)	1	Sensor	Amazon eBay
185-7428	Indicator, Oil Level (Intake Side)	1	Sensor	Amazon eBay
185-7429	O Ring (Begin Spec B)	1	Seal	Amazon eBay
191-2229	Starter	1	Starter	Amazon eBay
193-0244	Sender, Pressure - 0i1	1	Sensor	Amazon eBay
193-0318	Sender, Water Temperature	1	Sensor	Amazon eBay $73.95
309-0641-05	Switch, Pressure (S1)	1	Sensor	Amazon eBay
309-0641-18	PRESSURE SWITCH	1	Sensor	Amazon eBay
337-3782	Plug, Glow	3	Glow plug	Amazon eBay
503-2708	Clamp, Hose	1	Hose	Amazon eBay
503-2709	Clamp, Hose	1	Hose	Amazon eBay
505-0763	Cross, Pipe	1	Air filter	Amazon eBay
511-0235	Belt, Fan	1	Belt	Amazon eBay
541-0530	Auxiliary Fuel Pump Kit		Pump	Amazon eBay
541-0531	Remote Air Cleaner Kit		Air filter	Amazon eBay
A046Z961	Thermostat	1	Thermostat	Amazon eBay $59.85 FridayParts $57.61
A053K355	Alternator assembly / main winding (6-8 kW) - stator & rotor no longer orderable individually from Spec P/S		Alternator	eBay
A11-K12	POWER RELAY (A 11-K12)		Power relay	Amazon eBay
A11-K15	Relay-Starter Protection		Starter	Amazon eBay
AF2614	Element Air Cleaner, Primary	1	Air filter	Amazon eBay $75.04
AF2615	Element Air Cleaner, Secondary	1	Air filter	Amazon eBay
ES1676	BRUSH BLOCK ASSEMBLY	1	Brush block	Amazon eBay
ES1994	BATTERY NEGATIVE (-) CONNECTION		Battery	Amazon eBay
ES2020s	FUEL LINE CONNECTION		Fuel filter	Amazon eBay
EXS1195s	MESH SHIELD PROTECTS USERS FROM HOT MUFFLER AND EXHAUST PARTS	1	Shield	Amazon eBay
F245-1000	Oil Filter	1	Oil filter	Amazon eBay
F245-1001	Air Filter	1	Air filter	Amazon eBay
F245-1002	Fuel Filter	1	Fuel filter	Amazon eBay
F245-1003	Coolant Filter	1	Coolant filter	Amazon eBay
F245-1004	Belt	1	Belt	Amazon eBay
F245-1005	Battery	1	Battery	Amazon eBay
F245-1006	Spark Plug	1	Spark plug	Amazon eBay
FL3325	Filter, Oil (On Engine)	1	Oil filter	Amazon eBay
FL777	Filter, Oil (Skid Mounted)	1	Oil filter	Amazon eBay NAPA $19.46
FS1006	Filter, Fuel Water Separator	2	Fuel filter	Amazon eBay $29.99 NAPA $90.16
FS1842	AC CONDUIT CONNECTORS		Hose	Amazon eBay
G1250s	Air cleaner element	1	Fluid	Amazon eBay
M-1902s	FOAM GASKET IN WALL OF COMPARTMENT	1	Gasket	Amazon eBay
0908-0110	Health and Safety (Diesel Generator Sets)	1	Service part / kit	Amazon eBay NAPA $5.89
0981-0161	Operator Manual for Commercial Mobile Generator Set		Service part / kit	Amazon eBay
104-1861	Gear, Ring	1	Service part / kit	Amazon eBay
104-1916	Flywheel Assy (Includes Ring Gear)	1	Service part / kit	Amazon eBay
105-0744	Camshaft Assy	1	Service part / kit	Amazon eBay
185-2188	Plug	4	Service part / kit	Amazon eBay
185-2233	Plug	2	Service part / kit	Amazon eBay $9.49
185-2387	Bolt	2	Service part / kit	Amazon eBay
185-2388	Screw, Cap Lockwasher - Hex Head with (M6 x 1 x 16mm)	1	Service part / kit	Amazon eBay
185-2412	Cap, Sealing	1	Service part / kit	Amazon eBay
185-5477	Bolt, Flywheel (M10 x 1.25 x 30mm)	6	Service part / kit	Amazon eBay
185-5487	Pin, Straight	2	Service part / kit	Amazon eBay
185-5490	Cock Assy, Drain	1	Service part / kit	Amazon eBay
185-5502	Plug	1	Service part / kit	Amazon eBay
185-5558	Screw, Set	1	Service part / kit	Amazon eBay
185-5560	Key, Feather	1	Service part / kit	Amazon eBay
185-5843	Part 185-5843	1	Service part / kit	Amazon eBay
185-5924	Ball	3	Service part / kit	Amazon eBay
185-5938	Part 185-5938	2	Service part / kit	Amazon eBay
185-5939	Part 185-5939	1	Service part / kit	Amazon eBay
185-5941	Part 185-5941	2	Service part / kit	Amazon eBay
185-5942	Washer, Thrust .2mm Oversize	2	Service part / kit	Amazon eBay
185-5943	Washer, Thrust .4mm Oversize	2	Service part / kit	Amazon eBay
185-6039	Part 185-6039	1	Service part / kit	Amazon eBay
185-6040	Part 185-6040	1	Service part / kit	Amazon eBay
185-6121	Plug, Expansion	3	Service part / kit	Amazon eBay $5.99
185-6468	Plug	3	Service part / kit	Amazon eBay
185-6500	Plate, Lower Breather Element	1	Service part / kit	Amazon eBay
185-6501	Plate, Upper Breather Element	1	Service part / kit	Amazon eBay
185-6516	Tappet	6	Service part / kit	Amazon eBay
185-6517	Rod, Push	6	Service part / kit	Amazon eBay
185-6519	Gear, Cam	1	Service part / kit	Amazon eBay
185-6520	Stopper, Camshaft	1	Service part / kit	Amazon eBay
185-6521	Gear Assy, Idle (Includes Bushing)	1	Service part / kit	Amazon eBay
185-6522	Bushing, Idle Gear	1	Service part / kit	Amazon eBay
185-6523	Collar, Idle Gear	1	Service part / kit	Amazon eBay
185-6524	Collar, Idle Gear	1	Service part / kit	Amazon eBay
185-6525	Circlip, Idle Gear	1	Service part / kit	Amazon eBay
185-6526	Shaft, Idle Gear	1	Service part / kit	Amazon eBay
185-6529	Ring Assy, Piston, Standard	3	Service part / kit	Amazon eBay
185-6530	Ring Assy, Piston, .5mm Oversize	3	Service part / kit	Amazon eBay
185-6531	Pin, Piston	3	Service part / kit	Amazon eBay
185-6532	Circlip, Piston Pin	6	Service part / kit	Amazon eBay
185-6533	Rod Assy, Connecting	3	Service part / kit	Amazon eBay
185-6534	Bushing, Connecting Rod	3	Service part / kit	Amazon eBay
185-6535	Bolt, Connecting Rod	6	Service part / kit	Amazon eBay
185-6536	Bearing, Connecting Rod Standard	3	Service part / kit	Amazon eBay
185-6537	Bearing, Connecting Rod .2mm Undersize	3	Service part / kit	Amazon eBay
185-6538	Bearing, Connecting Rod .4mm Undersize	3	Service part / kit	Amazon eBay
185-6540	Gear, Crankshaft	1	Service part / kit	Amazon eBay
185-6541	Key	1	Service part / kit	Amazon eBay
185-6543	Sleeve, Crankshaft	1	Service part / kit	Amazon eBay
185-6544	Collar, Crankshaft	1	Service part / kit	Amazon eBay
185-6546	Bearing, Crankshaft	1	Service part / kit	Amazon eBay
185-6547	Bearing, Crankshaft .2mm Undersize	1	Service part / kit	Amazon eBay
185-6548	Bearing, Crankshaft .4mm Undersize	1	Service part / kit	Amazon eBay
185-6549	Bearing, Crankshaft	2	Service part / kit	Amazon eBay
185-6550	Bearing, Crankshaft .2mm Undersize	2	Service part / kit	Amazon eBay
185-6551	Bearing, Crankshaft .4mm Undersize	2	Service part / kit	Amazon eBay
185-6552	Bearing, Crankshaft, Standard	1	Service part / kit	Amazon eBay
185-6553	Bearing, Crankshaft .2mm Undersize	1	Service part / kit	Amazon eBay
185-6554	Bearing, Crankshaft .4mm Undersize	1	Service part / kit	Amazon eBay
185-6556	Washer, Thrust .4mm Oversize	2	Service part / kit	Amazon eBay
185-6721	Element, Breather	1	Service part / kit	Amazon eBay
185-6745	Piston, Standard	3	Service part / kit	Amazon eBay
185-6746	Piston, .5mm Oversize	3	Service part / kit	Amazon eBay
185-6855	Cylinder Block Assy (Includes Parts Marked *)	1	Service part / kit	Amazon eBay
185-6856	Plug	1	Service part / kit	Amazon eBay
185-6873	Camshaft Assy	1	Service part / kit	Amazon eBay
185-6874	Crankshaft	1	Service part / kit	Amazon eBay
185-6889	Plug	1	Service part / kit	Amazon eBay
185-7092	Cylinder Block Assy	1	Service part / kit	Amazon eBay
185-7223	Plug	1	Service part / kit	Amazon eBay
185-7308	Piston	3	Service part / kit	Amazon eBay
185-7309	Piston .5mm Oversize	3	Service part / kit	Amazon eBay
185-7310	Ring Assy, Piston, Standard	3	Service part / kit	Amazon eBay
185-7311	Ring Assy, Piston, .5mm Oversize	3	Service part / kit	Amazon eBay
185-7376	Crankshaft	1	Service part / kit	Amazon eBay
185-7417	Cylinder Block Assy (Begin Spec B)	1	Service part / kit	Amazon eBay
231-0353-SO	Adapter Assy, Generator (Includes Dowel Pin)	1	Service part / kit	Amazon eBay
333-0594	Heater, Engine	1	Service part / kit	Amazon eBay
502-0028	Part 502-0028	1	Service part / kit	Amazon eBay
502-0917	Adapter, Pipe	1	Service part / kit	Amazon eBay
505-0098	Band	1	Service part / kit	Amazon eBay
516-0247	Pin, Dowel	1	Service part / kit	Amazon eBay
612-6637	AC Control Assembly (single-phase)		Service part / kit	Amazon eBay
612-6689	DC Control Assembly		Service part / kit	Amazon eBay
740-1008	Washer, Flat (M1O)	10	Service part / kit	Amazon eBay
800-2515	Screw, Hex Head Cap (M8 x 1.25 x 30mm)	2	Service part / kit	Amazon eBay
815-0585	Screw, cap - Hex Head (Ml0 x 1.25 x 2Om)	1	Service part / kit	Amazon eBay
815-0600	Fuel Screu. Cap - Hex Head	2	Service part / kit	Amazon eBay
853-2010	Screw, Cap - Hex Head (M10 x 1.5 x 40mm)	1	Service part / kit	Amazon eBay
A043T620	Recommended Spares List (RSL) for RV Generator Set (HDKAH)	1	Service part / kit	Amazon eBay
A043T622	Recommended Spares List (RSL) for RV Generator Set (HDKAJ, HDKAK)	1	Service part / kit	Amazon eBay
A043T624	Recommended Spares List (RSL) for RV Generator Set (HDKAT)		Service part / kit	Amazon eBay
A043T632	Recommended Spares List (RSL) for RV Generator Set (HDKAU)		Service part / kit	Amazon eBay
A046A585	.50mm Spec H	3	Service part / kit	Amazon eBay
A046A616	Spec H	3	Service part / kit	Amazon eBay
A046L053	Operator Manual for RV Generator Set		Service part / kit	Amazon eBay
A046Z586	Standard Spec H	3	Service part / kit	Amazon eBay
A046Z590	Standard Spec H	3	Service part / kit	Amazon eBay
A046Z612	.50mm Spec H	3	Service part / kit	Amazon eBay
ES1992	FUEL AND ELECTRICAL LINE ENTRANCE HOLES	1	Service part / kit	Amazon eBay
EXS1123-1s	EXHAUST PIPE SUPPORT		Service part / kit	Amazon eBay
EXS1170	TAIL PIPE EXTENSION BEYOND VEHICLE		Service part / kit	Amazon eBay
EXS1186	EXTEND TAIL PIPE 1” PAST OUTSIDE EDGE OF VEHICLE	1	Service part / kit	Amazon eBay
EXS1188	LOCATE TAIL PIPE IN SHADED AREA OR ABOVE DASH LINE	1	Service part / kit	Amazon eBay
EXS1189	TAIL PIPE LOCATION		Service part / kit	Amazon eBay
F-118	North American Sales and Service Directory		Service part / kit	Amazon eBay NAPA $19.90
FS1463s-4	OPTIONAL JUNCTION BOX DOUBLE POLE DOUBLE THROW SWITCHING DEVICE	1	Service part / kit	Amazon eBay
M1886	COMPARTMENT MOUNTING HOLE PATTERN		Service part / kit	Amazon eBay
M1887	COMPARTMENT MOUNTING HOLE PATTERN		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
		1.85	0.49
		0.9	0.24
	50%	1.85	0.49
	100%	3.2	0.85
Prime		0.49	0.13
Prime	50%	1.85	0.49
Prime	100%	3.63	0.96
Standby		0.49	0.13
Standby	50%	1.85	49.0
Standby	100%	3.03	80.0

Available documents

Engine spec — 981-0522 Onan HDKA (spec A-M) Diesel RV Genset Service manual (06-2010) (Cummins/Onan)Operator's manual (Cummins/Onan)Operator's manual — 981-0104 Onan HDKAL HDKAS Mobile Genset Operator's manual () (Cummins/Onan)Operator's manual — 981-0161 Onan HDKAx (spec L-M) RV Genset Operator manual (03-2010) (Cummins/Onan)Operator's manual — 981-0161C Onan HDKAH HDKAJ HDKAK HDKAT HDKAU HDKAV Mobile Genset Operator's manual (07-2006) (Cummins/Onan)Operator's manual — Onan - Generator Model HDKAH (Spec A-R), HDKAJ (Spec A-K), HDKAK (Spec A-R) Operator Manual (Cummins/Onan)Owner's manual (Cummins/Onan)Owner's manual — 981-0104 Onan HDKAL HDKAS Commercial Mobile Genset Operator manual (07-2009) (Cummins/Onan)Owner's manual — 981-0149 Onan HDKAG RV Genset Operator manual (07-2009) (Cummins/Onan)Owner's manual — 981-0161B Onan HDKAJ HDKAK HDKAT HDKAU Mobile Genset Operator's manual (08-2005) (Cummins/Onan)Owner's manual — HDKAL, HDKAQ, HDKAR, HDKAS Operators Manual (Cummins/Onan)Owner's manual — Onan-EC-AGS Manual (Cummins/Onan)Parts manual — 981-0200C Onan HDKAJ HDKAK (spec A-F) HDKAT (spec A-B) Genset Parts Catalog (07-2001) (Cummins/Onan)Parts manual — 981-0200F Onan HDKAH thru HDKAU Parts Manual (2-2007) (Cummins/Onan)Parts manual — 981-0200G Onan HDKAH thru HDKAU Parts Manual (5-2007) (Cummins/Onan)Parts manual — 981-0256 Onan HDKAL (spec A-E) HDKAQ HDKAR (spec A) HDKAS (spec A-E) Genset Parts manual (04-2012) (Cummins/Onan)Parts manual — 981-0256D Onan HDKAL HDKAQ HDKAR HDKAS Parts Manual (6-2006) (Cummins/Onan)Parts manual — 981-0289 Onan HDKAL Spec F-H Parts Manual (1-2014) (Cummins/Onan)Parts manual — Cummins Onan Commercial Mobile Accessories 1 (Cummins/Onan)Parts manual — DK-Kohler (Cummins/Onan)Parts manual — F-1106A Cummins-Onan post-1990 Accessories & Service Support Catalog (02-2002) (Cummins/Onan)Parts manual — F-1123 Cummins-Onan RV Generator Handbook (08-2007) (Cummins/Onan)Parts manual — HDKAH, HDKAJ, HDKAK, HDKAT, HDKAU, HDKAV Parts Manual (Cummins/Onan)Service manual (Cummins/Onan)Service manual — 0981-0516-i9-hdkag-service-manual (Cummins/Onan)Service manual — 0981-0522-i32-hdkax-service-manual (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 — 900-0611B Onan HDKAx Repair Times (Onan)Service manual — 900-0615B Onan HDKAJ HDKAK Repair Times (Cummins/Onan)Service manual — 981-0522B Onan HDKAJ HDKAK HDKAT Mobile Genset Service Manual (07-1999) (Cummins/Onan)Service manual — 981-0605 Onan HDKAG Installation Manual (10-1997) (Cummins/Onan)Service manual — 981-0605 Onan HDKAG Installation Manual (12-2013) (Cummins/Onan)Service manual — 981-0612 Onan HDKAL HDKAQ HDKAR RV Genset Installation manual (10-1997) (Cummins/Onan)Service manual — 981-0613 Onan HDKAL HDKAS (spec A) Diesel Commercial Mobile Genset Installation manual (10-1997) (Cummins/Onan)Service manual — 981-0619 Onan HDKAL HDKAS Installation Manual (1-2014) (Cummins/Onan)Service manual — 981-0619B Onan HDKAL HDKAS (spec B-D) Diesel Mobile Genset Installation manual (06-1999) (Cummins/Onan)Service manual — 981-0623 Onan HDKAJ HDKAK HDKAT Mobile Genset Installation manual (08-1999) (Cummins/Onan)Service manual — 981-0623B Onan HDKAJ HDKAK (spec A-H) HDKAT HDKAU (spec A-E) Diesel Mobile Genset Installation manual (08-2005) (Cummins/Onan)Service manual — HDKAG Service Manual (Cummins/Onan)Service manual — HDKAH, HDKAJ, HDKAK, HDKAU, HDKAV Service Manual (Cummins/Onan)Service manual — HDKAL, HDKAQ, HDKAR, HDKAS Service Manual (Cummins/Onan)

This page was generated from the 42 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Cummins/Onan HDKA Generator Set

Service parts for the HDKA

Air intake

Fuel system

Oil system

Belts

Cooling system

Specifications

Engine

Maintenance & consumables

Service intervals

Service specifications

Recommended fluids

Fault codes

Procedures

Voltage reconnection

Common questions

Troubleshooting

Symptoms & remedies

Repair guides

Parts

Fuel consumption

Available documents