Service parts for the HDKC
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredBelts
1 requiredCooling system
1 requiredIgnition
1 requiredPrices 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 |
| Standby kVA | 10 |
| Prime power | 10 kW |
| Controller | EC-AGS+ |
| Oil capacity | 5.6 L |
| Voltage options | 120 V, 240 V |
| Phase | 1 |
| Rated current | 41.7 A |
| Power factor | 1.0 |
| Circuit breaker | 45 A |
| Battery cranking | 475 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Starting system | 12 V DC |
| Coolant capacity | 6.2 L |
| Dimensions (L×W×H) | 1050×620×686 mm |
| Dry weight | 351 kg |
| Wet weight | 348 kg |
| Sound level | 68.0 dBA @ 3 m |
| Tank runtime | 0.45 hr |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | A030Y328 | 3000 hr | Amazon eBay $30.43 | ||
| 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 liters | — | 1500 hr | ||
| Coolant filter | Coolant Filter | 143-2078 | Amazon eBay | ||
| Oil | cable size per Table 5-1 | 5.9 quarts | — | 250 hr | |
| Spark plug | 0167-1638 | 3000 hr | Amazon eBay $11.95 |
Service intervals
38| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| 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 | |
| Oil level | Check | 8 hr | Check oil daily or every 8 hours of operating time; perform a general inspection daily per Operator's Manual | |
| 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. | |
| 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 | |
| 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 | |
| Engine Oil and Oil Filter | Change | 250 hr | First service — Perform more often in hot weather or dusty environments; 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 | 1500 hr | 24 mo | Perform at least once every two years |
| Engine Air Filter Element | Replace | 500 hr | Perform more often when operating in dusty environments | |
| Engine Valve Lash | Adjust | 1500 hr | Must be performed by trained/experienced personnel | |
| Fuel Filter | Replace | 500 hr | Perform at least once every 5 years; perform every 250 hours when using B20 Bio-diesel fuel | |
| V-Belt Tension | Check | 500 hr | Tighten or replace the belt in accordance with the Service Manual if it can be deflected more than 12 mm (1/2 in) by thumb; must be performed by a qualified mechanic | |
| Generator Slip Rings and Brushes | Check | 800 hr | Perform more often in dusty environments; must be performed by a qualified mechanic | |
| Coolant System | Clean | 1500 hr | Flush Coolant System; perform at least once every 5 years | |
| Coolant System | Drain | 1500 hr | 24 mo | Flush coolant system; at least once every five years |
| Fuel Injector Pressure | Check | 1500 hr | Must be performed by a qualified mechanic; EPA requirement | |
| Fuel injector pressure | Test | 1500 hr | EPA requirement; trained personnel (Table 3-1) | |
| Generator Slip Rings / Brushes | Check | 3000 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 | |
| V-Belts & Coolant Hoses | Replace | 1500 hr | At least once every five years | |
| V-Belts and Coolant Hoses | Replace | 1500 hr | Perform at least once every 5 years; must be performed by a qualified mechanic | |
| Generator Bearing | Replace | 3000 hr | Trained personnel only | |
| Battery & Battery Connections | Check | 1 mo | Every month | |
| Battery & connections | Clean | 1 mo | Clean & check battery & connections; perform more often in hot weather | |
| Battery and Battery Connections | Check | 8 hr | 1 mo | Every Month |
| Oil/oil filter - Quiet Diesel 10000/12500 | Change | First service — Break-in then repeat (footnotes 1-4, 2-4) | ||
| Oil/oil filter - Quiet Diesel 5500 | Change | First service — Break-in then repeat (footnotes 1-4, 2-4) | ||
| Oil/oil filter - Quiet Diesel 7500/8000 | Change | First service — Break-in then repeat (footnotes 1-4, 2-4) | ||
| Spark arrester | Clean | 1 mo | Clean arrester; perform sooner if engine performance deteriorates |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
60| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Clearance | V-Belt deflection limit | 12 | mm (1/2 in) | by thumb |
| Gap | Fan Belt Tension (with alternator) | deflection 8-10 mm (0.3-0.4 inch) | mm | 10 kg (22 pounds) applied midway between alternator and pump pulleys |
| Gap | Fan belt deflection (with battery charging alternator) | 8-10 | mm (0.3-0.4 inch) | Under a force of 10 kg (22 pounds) applied midway between alternator and pump pulleys |
| Gap | Primary Belt Tension (deflection midway between alternator and pump pulleys) | 8-10 mm (0.3-0.4 inch) | mm | with a force of 10 kg (22 pounds) applied |
| Injection timing | Fuel Injection Timing (BTDC) | 14.25 | degrees | BTDC |
| 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 | Engine preheat time | up to 15 | seconds | Depending on engine temperature |
| Other | Fuel Flow Test minimum flow | not less than 200 ml (0.4 pints) per minute | ml/min | |
| Other | Fuel system priming time (control switch held in Stop) | at least half a minute | minutes/seconds | Shutdown Code No. 57, Overprime, occurs after 3 minutes of holding the switch down |
| Other | Genset mounting screw protrusion into base | at least 1/2 inch (10 mm) but not more than 1 inch (25 mm) | inch (mm) | Measured from bottom surface of base |
| Other | Genset off delay with no run request | 10 | minutes | |
| Other | Maximum cranking time | 30 | seconds | Wait at least 2 minutes before trying again |
| Other | Maximum power at/below 500 ft (152 m) elevation | 12,000 W (rated); 11,280 W at 2500 ft (762 m); 10,200 W at 5500 ft (1676 m); above 5500 ft 10,200 W minus 360 W every 1000 ft (305 m) | W | Approximately 3.5 percent power decrease per 1000 ft (305 m) elevation increase |
| Other | Minimum genset run time in automatic modes | 10 | minutes | |
| Other | Power output change with altitude | 3.5 | % decrease per 1000 ft increase | typical power output change based on ambient conditions |
| Other | Power output change with temperature | 1 | % decrease per 10 degF increase | typical power output change based on ambient conditions |
| 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 | Special tool - torque wrench | 0-75 | lbs-ft (0-100 N-m) | |
| Other | Tailpipe extension beyond vehicle perimeter | at least 1 | inch (25.4 mm) | |
| 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 | Cooling system pressure | 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 | Cylinder Compression Test | 370 psi (2.55 mPa) minimum | psi | |
| 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 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 | Fuel Nozzle Injection Pressure | 1991 psi (13.731 mPa) | psi | |
| Pressure | Fuel pump flow (minimum) | 200 | ml (0.4 pints) per minute | During prime with Start/Stop held at STOP |
| Pressure | Low Oil Pressure Shutdown | 14 | psi (97 kPa) | 3 seconds, switch closed |
| Pressure | Low Oil Pressure shutdown threshold | less than 14 psi for 3 seconds | psi | during normal operation |
| Pressure | Oil Pressure Switch opens | 14 psi (96 kPa) | psi | |
| Pressure | Oil Pressure Switch opens at | 14 psi (96 kPa) | psi | |
| Resistance | Coolant Temperature Sender | 1300 ohms in ice water, 700 ohms at room temperature, 57 ohms in boiling water | ohms | |
| Resistance | Coolant Temperature Sender | approximately 2617 ohms in ice water or 54 ohms in boiling water | ohms | |
| Resistance | Gateway harness continuity maximum resistance | 10 | Ohms | repair or replace harness if greater |
| Resistance | Governor Actuator | 2 to 4 | ohms | |
| Resistance | Governor Actuator | 2 to 4 ohms | ohms | |
| Resistance | Governor Actuator (Code 19 test) | 2.8 to 2.9 ohms | ohms | |
| Resistance | Governor Actuator (fault code 19 test) | 2.8 to 2.9 | ohms | |
| Resistance | Insulation Rotor (P3-7) to GROUND | 1 megohm minimum | megohm | |
| Resistance | Insulation T1, T3 & Q1 to GROUND | 1 megohm minimum | megohm | |
| Resistance | Insulation T1-T3, T2-T4, T1-Q1, T3-Q1 | 1 megohm minimum | megohm | |
| Resistance | New Stator Winding Insulation Resistance | at least 5 megohms | megohm | dry windings; polarization index at least 2 |
| Resistance | Q1-Q50 (P3-3 to P3-5) | 2.4-2.9 | ohms | |
| Resistance | Q1-Q60 (P3-3 to P3-6) | 2.0-2.4 | ohms | |
| Resistance | Rotor (P3-7 to P3-8) | 19.4 | ohms | |
| Resistance | Rotor (P3-7 to P3-8) | 22.5 | ohms |
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 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 ethylene glycol antifreeze / distilled water | above -37°C | 6.6 quart | Suitable for temperatures down to -34 F (-37 C) | |
| Coolant | 50/50 mixture of ethylene glycol anti-freeze and water | Fully formulated with rust inhibitors and coolant stabilizers; use fresh water low in minerals and corrosive chemicals (distilled best) | above -37°C | Factory fill suitable for temperatures down to -34 F (-37 C); see Section 14 Specifications for coolant capacity | |
| Coolant | 50/50 mixture of ethylene glycol antifreeze and water | Fully formulated with rust inhibitors and coolant stabilizers, mixed with fresh (distilled) water | above -37°C | 6.2 liters | Factory fill; suitable for temperatures down to -37 °C (-34 °F) |
| 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 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 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 15W-40 multi-grade recommended for year-round use | API performance Class CH-4 or better | 5.9 quarts (5.6 liters) | Choose SAE viscosity grade per Figure 2-1 for ambient temperatures expected until next scheduled oil change | |
| 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 | SAE 5W-30 | API CF, CF-4, CG-4, CH-4, or CI-4 | -28°C to 10°C | 5.6 liters | Expected ambient temperature -28 to 10 °C (-20 to 50 °F) |
| Engine oil | SAE 10W-30 10W-40 | API CF, CF-4, CG-4, CH-4, or CI-4 | -18°C to 27°C | 5.6 liters | Expected ambient temperature -18 to 27 °C (0 to 80 °F) |
| Engine oil | SAE 15W-40 (OnaMax) | API CF, CF-4, CG-4, CH-4, or CI-4 | -12°C to 38°C | 5.6 liters | Expected ambient temperature -12 to 38 °C (10 to 100 °F); multigrade oils such as SAE 15W-40 are recommended for year round use |
| Engine oil | SAE 30 | API CF, CF-4, CG-4, CH-4, or CI-4 | above 0°C | 5.6 liters | Expected ambient temperature 0 °C (32 °F) and higher |
| 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 | ASTM No.2-D / No.1-D / No.2-DLS / No.1-DLS / B5 Biodiesel | minimum Cetane number 45 | No.2-D or No.2-DLS above 23 degF; No.1-D or No.1-DLS below 23 degF; B5 Biodiesel above 50 degF; use No.1 diesel below 32 degF and during long light-load periods; cloud point at least 10 degF below lowest expected fuel temperature | ||
| 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 | Grade 2-D S500 or 2-D S15; Grade 1-D S500 or 1-D S15 below -10 °C (14 °F) | ASTM D975 or EN 590; lubricity per ASTM D6078 min 3100 grams or ASTM D6079 / ISO 12156-1 max 0.45 mm scar; sulfur max 500 ppm (0.05% weight), 15 ppm (0.0015% weight) from 2010; do not use above 10,000 ppm (1.0% weight) | Minimum Cetane number 45 below -10 °C (14 °F); minimum Cetane number 50 below -20 °C (-4 °F) or above 1500 m (5000 ft). Bio-diesel B5 suitable; up to B20 with conditions. | ||
| Fuel | HD-5 grade liquid propane | at least 90% propane | Fuels other than HD-5 can contain more than 2.5% butane causing poor vaporization/starting below 32 degF | ||
| 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 | ||
| Fuel | No. 2 diesel fuel (ASTM 2-D) above freezing; No. 1 diesel fuel (ASTM 1-D) below freezing | Cetane number of at least 45 | Bio-diesel B5-B20 approved per ASTM D7467; use within 6 months of manufacture | ||
| Fuel | No. 2 diesel fuel (ASTM 2-D) when outdoor ambient above freezing; No. 1 diesel fuel (ASTM 1-D) when below freezing | Cetane number of at least 45; ULSD meeting ASTM D975 lubricity is suitable; B5 Bio-Diesel meeting industry specifications and quality is suitable | Use clean, fresh fuel; ULSD has 1 to 2 percent less energy content | ||
| Fuel | Regular unleaded gasoline | Ethanol blend not more than 10% ethanol; methanol blend not more than 5% methanol | Use fresh gas, not more than 30 days old; fuel stabilizer extends fuel life | ||
| Other | Cummins Onan Premium Fuel System Cleaner | 12.0 oz | Treats up to 24 gallons of gasoline; #326-5342 | ||
| Other | OnaFresh GXLP fuel stabilizer | 16.0 oz | Treats 40 gallons of gasoline; #326-5365 |
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
24| 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 add if low, repair leaks; check for blockages and clean; reduce load |
| 2 | Low Oil Pressure | Low oil pressure cutoff switch did not open | Shutdown | Check engine oil level, add or drain as needed |
| 3 | Service Check | See second-level fault code (flashed via STOP/PRIME) | Shutdown | Press STOP/PRIME to flash 2-digit service fault code |
| 4 | Over Crank | Cranking exceeded 30 seconds without engine starting | Shutdown | Check fuel level, prime fuel system; check air filter element; replace engine oil with proper viscosity; check fuel fittings; replace fuel filter |
| 12 | Over Voltage | Control is unable to maintain rated voltage | Shutdown | Contact local dealer or distributor |
| 13 | Under Voltage | Control is unable to maintain rated voltage | Shutdown | Reduce load |
| 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 | Contact local dealer or distributor |
| 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 | Control is unable to sense output voltage | Shutdown | Contact local dealer or distributor |
| 29 | High Battery Voltage | Voltage across battery system is greater than 19 Volts | Shutdown | Check battery bank connections (parallel not series); select lower battery boost charge rate |
| 32 | Low Cranking Speed | Cranking speed less than 180 RPM for more than 2 seconds | Shutdown | Clean/tighten battery connections, recharge or replace battery; replace engine oil with proper viscosity |
| 35 | Control Card Failure | Microprocessor EEPROM error occurred during self test | Shutdown | Contact local dealer or distributor |
| 36 | Engine Stopped | Engine stopped without receiving a command from the control | Shutdown | Check fuel level, prime fuel system; check air filter element; check for mechanical damage |
| 37 | Invalid Set Configuration Fault | Continuous 'Stop' input connected to Ground or MAT sensor input not Open; logic checked at every Start or Prime attempt | Warning | Check for any open wire connections for continuous Stop and MAT sensor and repair |
| 38 | Over Current (Field Overload) | Low power factor loads | Shutdown | Reduce load; have appliances checked for proper operation |
| 41 | Generator Rotor | Control is unable to sense field or output voltage | Shutdown | Contact local dealer or distributor |
| 42 | Processor | Microprocessor ROM error occurred during self test | Shutdown | Contact local dealer or distributor |
| 43 | Processor | Microprocessor RAM error occurred during self test | Shutdown | Contact local dealer or distributor |
| 45 | Speed Sense | Control is unable to sense quadrature frequency | Shutdown | Contact local dealer or distributor |
| 48 | Generator Field Sense | Control is unable to sense field voltage | Shutdown | Contact local dealer or distributor |
| 57 | Over Prime | Priming exceeded 3 minutes | Shutdown | Check control switch for object holding it in STOP/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
12Adjusting Voltage adjustment
⚠ Touching uninsulated live parts can result in severe personal injury or death
Tools: Accurate AC voltmeter
- Disconnect all loads and connect accurate meters to measure AC output voltage.
- Start the generator set and let voltage and frequency stabilize for 5 to 10 seconds.
- Rapidly press START 6 times; the status lamp blinks once a second.
- Press START and release quickly to increase voltage about 0.6 volt.
- Press START about 1 second to decrease voltage about 0.6 volt.
- Normal operation resumes in 20 seconds; last adjustment saved by controller.
Belt Tension When Equipped With Battery Charging Alternator adjustment
- Remove top genset housing panel.
- Adjust tension so deflection is 8-10 mm (0.3-0.4 inch) midway between alternator and pump pulleys when 10 kg (22 pounds) force is applied.
Belt Tension When Not Equipped With Battery Charging Alternator adjustment
- Run new belt over both pulleys and pull pump pulley up to its hub and push it on.
- Secure pulley with 4 bolts and tighten according to specifications.
HIGH-IDLE SPEED reset adjustment
⚠ Adjusting screws near rotating belts and pulleys; be careful not to get hands near pulleys and belts.
Tools: 12 volt battery
- Remove governor actuator to allow full fuel rack, leave connected to avoid Fault No. 19.
- Disconnect fuel pump and power directly with 12 volt battery.
- Disconnect all loads and start genset.
- Adjust stop screws to obtain 67.3-68.3 Hertz (2019-2049 rpm).
- Seal adjusting threads with paint.
- Re-install all removed or disconnected components.
Resetting High-Idle Speed adjustment
⚠ Adjusting screws are near rotating belts and pulleys that can cause severe personal injury
- Remove governor actuator but leave it connected; plug the opening.
- Disconnect the fuel pump and power it directly with a 12-volt battery.
- Disconnect all loads from the generator set and start it.
- Adjust the stop screws to obtain 67.3-68.3 Hertz (2019-2049 rpm).
- Seal the adjusting threads with paint.
- Reinstall all components that were removed or disconnected.
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.
Fuel Flow Test diagnostic
⚠ Fuel pump is not serviceable
Tools: Graduated container
- Disconnect the fuel return hose and point the end into a graduated 1 liter container.
- Hold the Start/Stop switch in STOP for the duration of the test.
- Flow should not be less than 200 ml (0.4 pints) per minute.
- If low, replace the fuel filter; check for restrictions; then replace the fuel pump.
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
Installation and Setup Test diagnostic
- Verify generator set operation using the Start/Stop switch located on the generator set.
- Verify manual start/stop of the generator set from the app dashboard using the START and PRIME/STOP buttons.
- Check operation of the temperature sensors with Auto mode and Air Conditioning Sense enabled.
- Verify the generator set starts automatically when the settings are met.
- Verify the accelerometer by driving the vehicle at 10 mph and checking that AGS is automatically disabled.
- Verify delayed shutdown: enable AGS, allow the generator set to start, disable AGS, confirm shutdown in 10 minutes.
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 | |||
| 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 | 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. | ||
| 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. |
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 (10.0 kVA).
What fuel does the Cummins/Onan HDKC use?
The Cummins/Onan HDKC runs on diesel.
What is the cooling system capacity of the Cummins/Onan HDKC?
The Cummins/Onan HDKC cooling system holds 6.2 liters (1.6 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the oil capacity of the Cummins/Onan HDKC?
The Cummins/Onan HDKC has an engine oil capacity of 5.6 liters (5.9 US quarts), per the manufacturer specification sheet.
How loud is the Cummins/Onan HDKC?
The Cummins/Onan HDKC is rated at 68.0 dBA at 3 m, per the manufacturer specification sheet.
What is the dry weight of the Cummins/Onan HDKC?
The Cummins/Onan HDKC has a dry weight of 351 kg (773 lb).
What voltages is the Cummins/Onan HDKC available in?
The Cummins/Onan HDKC is offered in 120 V, 240 V, 1-phase.
What battery does the Cummins/Onan HDKC use?
The Cummins/Onan HDKC uses 1 battery, 12 V each, 475 CCA, per the manufacturer specification sheet. The starting system is 12 V DC.
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
6Fault codes
| Code | Meaning | Remedy |
|---|---|---|
| 1 | Engine Over Temperature — Indicates that, during normal operation, the engine coolant temperature exceeded 115°C (239°F) for 10 seconds. | Check engine coolant level: if coolant level is low, add coolant as necessary and repair any leaks; Check for blockages: if an air inlet or outlet opening on the bottom of the generator set is blocked, remove objects; if dirt is fouling the radiation fins, clean dirt out; Reduce load: reduce the number of connected appliances, especially air conditioners and battery chargers |
| 2 | Low Oil Pressure — Indicates that the low oil pressure cutoff switch did not open. | Check engine oil level: if the dipstick indicates oil is low, add oil; if oil is above the full mark on dipstick, drain excess oil |
| 3 | Service Check | See second-level fault code. |
| 4 | Over Crank — Indicates that cranking exceeded 30 seconds without engine starting. | Check fuel level: if fuel level is low, fill the fuel tank; prime the engine fuel system by positioning the control switch to STOP/PRIME for 30 seconds; Check air filter element: replace the air filter if dirty; Replace engine oil with oil of proper viscosity for the ambient temperature; Check fuel fittings: tighten any fuel fitting if there is a fuel or air leak, reprime the engine fuel system by positioning the control switch to STOP/PRIME for 30 seconds; Replace fuel filter |
| 12 | Over Voltage — Indicates the control is unable to maintain rated voltage. | Contact local dealer or distributor |
| 13 | Under Voltage — Indicates the control is unable to maintain rated voltage. | Reduce load: reduce the number of connected appliances, especially air conditioners and battery chargers |
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 (122 entries) →
Repair guides
46- AC Power Output Connections - Wiring Methods
- Brushes and Slip Rings - Checking and Replacing
- Checking Oil Level
- Cleaning the Spark Arrester
- Draining and Cleaning Cooling System
- Draining and Refilling Cooling System
- Exhaust System Checks
- Final Connections and Testing
- Final Connections and Testing
- Fuel Flow Test
- General Inspection
- Genset Harness Installation
- Genset Harness Installation
- HIGH-IDLE SPEED reset
- Installing the Generator
- Maintaining the Battery
- Manual Starting
- Mechanical System Checks
- Pre-start Checks
- Preparing to Mount the EC-20
Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
29| 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 $32.26 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 NAPA $4.68 |
| 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 |
| 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 eBay $30.43 |
| TB2-4 | FAULT 1 GROUND OUTPUT TO LIGHT/RELAY* | Grounding terminal | Amazon eBay NAPA $216.88 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 |
| 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 |
|---|---|---|---|
| 0.4 | 0.11 | ||
| 50% | 1.8 | 0.48 | |
| 100% | 3.8 | 1.01 | |
| Full-load | 1.2 | 4.5 | |
| Full-load | 100% | 3.8 | 14.0 |
| Full_load | 100% | 3.0 | 0.78 |
| Half-load | 0.48 | 1.8 | |
| Half-load | 50% | 1.8 | 6.7 |
| 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)Operator's manual — a043d715-i8-hdkcx-ops-manual (Cummins/Onan)Owner's manual — 42345 Owners Manual (Cummins/Onan)Owner's manual — Onan-EC-AGS Manual (Cummins/Onan)Parts manual — Cummins Onan Commercial Mobile Accessories 1 (Cummins/Onan)Parts manual — F-1106D-EN Cummins-Onan Commercial Mobile generator accys (07-2008) (Cummins/Onan)Parts manual — F-1123 Cummins-Onan RV Generator Handbook (08-2007) (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 — 981-0540B Onan HDKCx (HDKCA to HDKCD) Mobile Diesel Genset Service 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 — a043m526-i13-hdkcx-service-manual (Cummins/Onan)
This page was generated from the 24 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.