Service parts for the HDCAD
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
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 | 12 kW |
| Controller | Integrated Microprocessor Based Engine and Generator Controller |
| Oil capacity | 6.3 L |
| Voltage options | 120/240 V |
| Phase | 1 |
| Rated current | [100, 50] A |
| Circuit breaker | [50] A |
| Battery cranking | [475, 650] CCA |
| Battery voltage | 12 V |
| Coolant capacity | 5.8 L |
| Max ambient | 40 °C |
| Dimensions (L×W×H) | 1050×620×686 mm |
| Dry weight | 300 kg |
| Sound level | 68.0 dBA @ [3, 15] m |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Cleaner Assy, Air (Includes | 140-3050 | Amazon eBay | ||
| Fuel filter | Bracket, Fuel Filter | 585-04 | Amazon eBay | ||
| Oil filter | Stud, Oil Filter | 187-1140 | Amazon eBay | ||
| Battery | 12 VDC, negative-ground control and starting system | — | |||
| Belt | — | 150 hr | |||
| Coolant | 5.8 quart (5.5 liter) | — | |||
| Coolant filter | — | ||||
| Oil | 6.3 quart (6.0 liter) | — | |||
| Spark plug | — |
Common questions
What size generator is the Cummins/Onan HDCAD?
The Cummins/Onan HDCAD is rated 12 kW standby.
Is the Cummins/Onan HDCAD diesel or gas?
The Cummins/Onan HDCAD runs on Diesel.
What is the cooling system capacity of the Cummins/Onan HDCAD?
The Cummins/Onan HDCAD cooling system holds 5.8 liters (1.5 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
How much oil does the Cummins/Onan HDCAD take?
The Cummins/Onan HDCAD has an engine oil capacity of 6.3 liters (6.7 US quarts), per the manufacturer specification sheet.
What is the sound level of the Cummins/Onan HDCAD?
The Cummins/Onan HDCAD is rated at 68.0 dBA at [3, 15] m, per the manufacturer specification sheet.
What is the dry weight of the Cummins/Onan HDCAD?
The Cummins/Onan HDCAD has a dry weight of 300 kg (661 lb).
What voltages is the Cummins/Onan HDCAD available in?
The Cummins/Onan HDCAD is offered in 120/240 V, 1-phase.
How many cold cranking amps does the Cummins/Onan HDCAD require?
The Cummins/Onan HDCAD uses 12 V each, [475, 650] CCA, per the manufacturer specification sheet.
What oil filter fits the Cummins/Onan HDCAD?
The Cummins/Onan HDCAD uses oil filter part number 187-1140.
What fuel filter does the Cummins/Onan HDCAD use?
The Cummins/Onan HDCAD uses fuel filter part number 585-04.
Which air filter part number does the Cummins/Onan HDCAD take?
The Cummins/Onan HDCAD uses air filter part number 140-3050.
Troubleshooting
6Fault codes
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 1 | HIGH TEMPERATURE FAULT—CODE NO. 1 | (The engine coolant temperature exceeded 230° F [110° C]) | 1. Check the engine coolant level and add coolant as necessary. 2. Check for and remove any objects blocking the air inlet or outlet openings in the bottom of the genset. 3. Watch the temperature gauge (optional) and run fewer appliances at the same time to keep down the engine temperature. |
| 2 | LOW OIL PRESSURE FAULT—CODE NO. 2 | (The low oil pressure cutoff switch closed for more than 10 seconds) | 1. Check the engine oil level and add oil as necessary. 2. Drain the excess oil if the oil level is above the Full mark on the dipstick. (The oil will foam if the level is too high and result in possible loss of oil pressure.) |
Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| DO NOT MAINTAIN A CHARGE | (The battery, battery connections or charging system are in marginal condition) | 1. Clean and tighten the positive (+) and negative (–) battery cable connections at the battery and at the genset. 2. Recharge or replace the battery. Refer to the battery manufacturer’s recommendations. |
| THE ENGINE CRANKS BUT DOES NOT START | (Fuel delivery is marginal) | 1. Check the fuel level and refill as necessary. 2. Prime the engine fuel system by holding the control switch at Stop for one minute. 3. Check the engine air filter and remove any blockage. 4. Check for fuel (air) leaks at all fuel fittings and tighten as necessary. 5. Replace the fuel filter. |
| THE STARTER ENGAGES AND DISENGAGES | (Cranking voltage dips below 6 volts because of low battery charge or poor connections) | 1. Have the vehicle propulsion engine running while trying to start the genset. (The battery charging alternator may be able to maintain starting voltage high enough to get the genset started.) 2. Clean and tighten the positive (+) and negative (–) battery cable connections at the battery and at the genset. 3. Recharge or replace the battery. Refer to the battery manufacturer’s recommendations. |
| THERE IS NO POWER WHEN THE GENSET IS RUNNING | (A line circuit breaker is OFF, tripped or malfunctioning) | 1. Reset or turn ON the line circuit breaker on the genset. See RESETTING CIRCUIT BREAKERS (Page 9). 2. Reset or turn ON any other circuit breaker in the power supply system. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Cummins/Onan HDCAD troubleshooting guide (25 entries) →
Parts
94| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 054-01 | Hose, Intake | 1 | Hose | Amazon eBay |
| 054-02 | Hose, Intake | 1 | Hose | Amazon eBay |
| 12.0HDCAD42345A | ENGINE | Engine | buy | |
| 140-3050 | Cleaner Assy, Air (Includes | 1 | Air filter | Amazon eBay |
| 140-3071 | Air filter | 1 | Air filter | Amazon eBay $13.50 FridayParts $16.50 |
| 140-3072 | Cover, Air Cleaner | 1 | Air filter | Amazon eBay |
| 149-2513 | Filter, Fuel | 1 | Fuel filter | Amazon eBay $36.95 NAPA $31.59 FridayParts $48.61 |
| 149-2605 | Line, Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 149-2790 | Pump, Fuel | 1 | Pump | Amazon eBay $98.00 FridayParts $24.89 |
| 154-2800 | Gasket, Exhaust Manifold | 2 | Gasket | Amazon eBay |
| 184-0010 | Gasket | 1 | Gasket | Amazon eBay |
| 187-1000 | Filter, Oil | 1 | Oil filter | Amazon eBay $63.20 FridayParts $20.19 |
| 187-1021 | Stud, Injection Pump (20mm) | 6 | Pump | Amazon eBay |
| 187-1022 | *Cup, Sealing (44.5mm Dia) | 1 | Seal | Amazon eBay |
| 187-1023 | *Cup, Sealing (22mm Dia.) | 1 | Seal | Amazon eBay |
| 187-1032 | Seal, Lead | 2 | Seal | Amazon eBay |
| 187-1036 | Gasket, Set Screw | 2 | Gasket | Amazon eBay |
| 187-1038 | Cup, Sealing (12mm Dia.) | 6 | Seal | Amazon eBay |
| 187-1041 | Seal, Crankshaft Front Oil | 1 | Seal | Amazon eBay |
| 187-1042 | Seal, Crank Rear Oil | 1 | Seal | Amazon eBay |
| 187-1043 | Clip, Fuel Hose | 2 | Hose | Amazon eBay |
| 187-1045 | Cup, Sealing (16mm Dia.) | 1 | Seal | Amazon eBay |
| 187-1059 | Gasket | 6 | Gasket | Amazon eBay |
| 187-1061 | Shield, Nozzle Heat | 3 | Injector | Amazon eBay |
| 187-1062 | Seal, Valve | 6 | Seal | Amazon eBay |
| 187-1065 | Gasket, Oil Fill Cap | 1 | Gasket | Amazon eBay |
| 187-1066 | Clip, Hose | 1 | Hose | Amazon eBay |
| 187-1068 | Gasket | 3 | Gasket | Amazon eBay |
| 187-1107 | Spring, Nozzle | 3 | Injector | Amazon eBay |
| 187-1131 | Clip, Hose | 2 | Hose | Amazon eBay |
| 187-1136 | Gasket, Nozzle Holder | 3 | Gasket | Amazon eBay |
| 187-1137 | Gasket, Heat Shield | 3 | Gasket | Amazon eBay |
| 187-1140 | Stud, Oil Filter | 1 | Oil filter | Amazon eBay |
| 187-1143 | Stud, Injection Pump Housing | 1 | Pump | Amazon eBay |
| 187-1150 | Cup, Bush Sealing (10mm Dia.) | 1 | Seal | Amazon eBay |
| 187-1162 | Pump Assy, Injection | 1 | Pump | Amazon eBay |
| 187-1180 | Plate, Lever Pump Link | 1 | Pump | Amazon eBay |
| 187-1191 | Cup, Sealing (8mm) | 1 | Seal | Amazon eBay |
| 187-1194 | Gasket, Exhaust Manifold | 1 | Gasket | Amazon eBay |
| 187-1197 | *Pump, Oil | 1 | Pump | Amazon eBay |
| 187-1201 | Gasket, Cylinder Head | 1 | Gasket | Amazon eBay |
| 187-1212 | Cord, Glow Plug | 1 | Glow plug | Amazon eBay |
| 187-1215 | Hose, Fuel Feed Leakoff | 1 | Hose | Amazon eBay |
| 187-1219 | Gasket, Exhaust Manifold | 1 | Gasket | Amazon eBay |
| 187-1222 | Pump Assy, Oil (Includes Parts | 1 | Pump | Amazon eBay |
| 187-1229 | Gasket, Governor Lever Cover | 1 | Gasket | Amazon eBay |
| 187-1240 | Gasket, Cylinder Head Cover | 1 | Gasket | Amazon eBay |
| 187-1249 | Nozzle Assy, Injection (See | 3 | Injector | Amazon eBay |
| 187-1273 | Gear, Injection Pump & Valve | 1 | Pump | Amazon eBay |
| 187-1276 | Hose, PCV | 1 | Hose | Amazon eBay |
| 187-1277 | Hose, PCV | 1 | Hose | Amazon eBay |
| 187-1278 | Hose, PCV | 1 | Hose | Amazon eBay |
| 187-1286 | Cup, Sealing (35mm Dia.) | 4 | Seal | Amazon eBay |
| 187-1287 | Cover, Injection Pump Housing | 1 | Pump | Amazon eBay |
| 187-1289 | Glow plug | 3 | Glow plug | Amazon eBay |
| 187-1307 | Stud, Injection Pump Housing | 1 | Pump | Amazon eBay |
| 187-1310 | Stud, Water Pump | 1 | Pump | Amazon eBay |
| 187-1331 | Clip, Fuel Pump Lead Wire | 1 | Pump | Amazon eBay |
| 187-1334 | Gasket, Plug | 1 | Gasket | Amazon eBay |
| 187-1335 | Gasket, Plug | 1 | Gasket | Amazon eBay |
| 187-1341 | Dowel, Oil Pump | 2 | Pump | Amazon eBay |
| 187-1342 | Wire, Lead Seal | 2 | Seal | Amazon eBay |
| 187-1346 | Nozzle | 3 | Injector | Amazon eBay |
| 193-0318 | Sender, Water Temperature | 1 | Sensor | Amazon eBay $73.95 |
| 300-1200 | DC Converter | Air filter | Amazon eBay | |
| 332-1554 | Clamp, Hose | 2 | Hose | Amazon eBay |
| 403-3859 | Seal, Oil Drain | 2 | Seal | Amazon eBay |
| 403-4219 | Seal, Radiator Drain | 1 | Seal | Amazon eBay |
| 502-1299 | Connector, Hose | 1 | Hose | Amazon eBay |
| 502-1306 | Connector, Hose | 1 | Hose | Amazon eBay |
| 503-0365 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 503-0685 | Clamp, Hose | 1 | Hose | Amazon eBay $15.00 |
| 503-1138 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 503-1141 | Band, Hose Clamp | 2 | Hose | Amazon eBay |
| 503-1148 | Band, Hose Clamp | 1 | Hose | Amazon eBay |
| 503-1959 | Hose, Cooling Over Flow | 1 | Hose | Amazon eBay $10.00 |
| 503-2053 | Hose, Intake | 1 | Hose | Amazon eBay |
| 503-2055 | Hose, Engine (Out) | 1 | Hose | Amazon eBay |
| 503-2059 | Hose, Overflow | 1 | Hose | Amazon eBay |
| 503-2060 | Hose, Air Bleed | 1 | Hose | Amazon eBay |
| 503-2435 | Hose, Air | 1 | Hose | Amazon eBay |
| 503-2436 | Hose, Air | 1 | Hose | Amazon eBay |
| 503-2446 | Hose, Intake | 1 | Hose | Amazon eBay |
| 580-01 | Line, Fuel Injection Pump | 1 | Pump | Amazon eBay |
| 585-04 | Bracket, Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 746-01 | Seal, Fan (460mm) | 1 | Seal | Amazon eBay FridayParts $11.50 |
| 746-02 | Seal, Fan (420mm) | 3 | Seal | Amazon eBay FridayParts $11.50 |
| 872-02 | Band, Hose Clamp | 4 | Hose | Amazon eBay |
| 951-09 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 951-12 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 951-35 | Clamp, Hose | 1 | Hose | Amazon eBay |
| 1000-1500 | Electric Frying Pan or Wok | 1200 | Service part / kit | Amazon eBay |
| 1400-2000 | Air Conditioner | Service part / kit | Amazon eBay | |
| 600-1000 | Refrigerator | 1 | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Full-load | 5.03 | 1.1 | |
| Full-load | 100% | 4.16 | 1.1 |
| Half-load | 2.34 | 0.62 | |
| Half-load | 50% | 2.34 | 0.62 |
| No-load | 0.41 | 0.11 | |
| Prime | 0.11 | 0.41 | |
| Standby | 0.11 | 0.41 |
Available documents
Parts manual — 981-0275 Onan HDCAC HDCAD (spec A-D) Diesel Mobile Genset Parts manual (08-2012) (Cummins/Onan)Parts manual — F-1106A Cummins-Onan post-1990 Accessories & Service Support Catalog (02-2002) (Cummins/Onan)Service manual — 981-0165 Onan HDCAC HDCAD Diesel Mobile Genset Operator's manual (09-2001)Service manual — 981-0171 Onan HDCAC HDCAD Operator's Manual (11-2003)Service manual — 981-0632 Onan HDCAC HDCAD Diesel Mobile Genset Installation manual (09-2001) (Cummins/Onan)Service manual — 981-0638 Onan HDCAC HDCAD Installation Manual (11-2003) (Cummins/Onan)
This page was generated from the 6 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.