Service parts for the NH RV
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Voltage options | 120 V, 249 V, 120/240 V |
|---|---|
| Phase | single-phase |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter | 149-1353G | Amazon eBay | ||
| Fuel filter | — | 100 hr | |||
| Oil filter | — | 50 hr | |||
| Battery | — | 100 hr | |||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | 3.25 liters | — | 100 hr | ||
| Spark plug | — | 100 hr |
Common questions
What air filter fits the Cummins/Onan NH RV?
The Cummins/Onan NH RV uses air filter part number 149-1353G.
Troubleshooting
3Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| FAILS TO CRANK | 1. Bad Battery Connection 2. Low Battery 3. Faulty Start Solenoid (K1) 4. Faulty Start Switch | 1. Clean and tighten all battery and cable connections. 2A. Check specific gravity. Recharge or replace battery if necessary 2B. Reverse current diode (CR1) may be shorted or open causing a drain on the battery. R2 may be open. 3A. Check for Battery Voltage at K1 “I” terminal. 3B. Push start switch. Check start solenoid 'St' terminal voltage to ground. When battery voltage at start solenoid 'B' terminal is present, battery voltage should also appear at ‘S1' terminal: if not, replace start solenoid 4. Jumper switch (#3 terminal) to ground. If solenoid energizes, check for Battery Voltage at K1 “I” terminal. |
| CRANKS SLOWLY | 1. Bad Battery Connection 2. Low Battery | |
| CRANKS BUT WON'T START | 1. Blown Fuse (F2) 2. Faulty Fuel Solenoid Or Fuel Pump 3. Faulty Ignition 4. Inoperative Choke 5. Faulty Crank Ignition Relay (K2) | 1. Replace fuse (F2) on control unit. 2. Fuel solenoid must open during cranking and running. Check by removing steel line from carburetor and crank engine. If fuel solenoid is open, fuel will pulsate out of this line. If it does not, the fuel solenoid and fuel pump must be checked 3. Check to see if points open and close during cranking. If they do not open and close, adjust and set points. Plug and plug wires must be in good condition. Voltage at ignition coil negative terminal (-) must alternate from + 12 volts to zero volts as points open and close during engine cranking. 4. With engine not running, check choke vane movement by pushing choke lever arm. Choke must be in closed position with cold engine, and must be free to move against bimetal spring. As engine warms up, bi-metal spring relaxes and allows choke vane to open fully. The lever will pulsate as engine warms up. See ADJUSTMENT section. 5. Check voltage from relay terminal “4” to ground while cranking So Raully ‘Crank Ignition ny (K2) unit. Battery voltage should appear at this terminal. If not check for voltage at relay terminals “1” and “2°. If battery voltage is present at terminals 1 and 2, but not at 4, replace relay. If not voltage appears at terminals 1 and 2 on relay while cranking, check wiring between start solenoid (K1) and crank ignition relay (K2) |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
6| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 140-1673 | A carburetor air preheater kit is available for cold weather operation - below 45° F (7 °C), which helps prevent carburetor icing. | Carburetor air preheater kit | Amazon eBay | |
| 149-1353G | Air Filter | Air filter | Amazon eBay | |
| 167-0241D | Spark Plug | Spark plug | Amazon eBay | |
| 300-0985 | Control. | 1 | Service part / kit | Amazon eBay |
| 300-0986 | * - Included in 300-0986 Control Assembly | 1 | Service part / kit | Amazon eBay $150.00 |
| 940-0121 | 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 |
|---|---|---|---|
| Prime | 100% | 18.62 | 4.92 |
Available documents
Parts manual — F-1061 Cummins-Onan RV Green Label Parts (Filter & Tune-Up) Reference Guide (02-2010) (Cummins/Onan)Service manual — 940-0121 Onan 6.5KW NH (spec P) Operator's manual (10-1981)