Specifications
| Fuel | gasoline |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 2 kW |
| Standby kVA | 3 |
| Voltage options | 12 V, 24 V, 32 V |
| Phase | 1 Phase |
| Rated current | 6 A |
| Battery group | SAE Group 1H |
| Battery voltage | Battery Voltage: 1.5MAJ-232R, 1.OMAJ-1 & 3R, 2.5MAJ-1R V |
| Battery quantity | 1 |
Maintenance & consumables
for the Cummins/Onan MAJ| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | — | find | |||
| Fuel filter | — | find | |||
| Oil filter | — | find | |||
| Belt | — | find | |||
| Coolant | — | ||||
| Coolant filter | — | find | |||
| Oil | — |
Common questions
What is the power rating of the Cummins/Onan 2.5MAJ?
The Cummins/Onan 2.5MAJ is rated 2 kW standby (3.125 kVA).
What engine does the Cummins/Onan 2.5MAJ use?
The Cummins/Onan 2.5MAJ is powered by the Cummins/Onan MAJ engine.
What fuel does the Cummins/Onan 2.5MAJ use?
The Cummins/Onan 2.5MAJ runs on gasoline.
Troubleshooting
3Symptoms & remedies
| Symptom | Remedy |
|---|---|
| If the test lamp lights, a ground is indicated. | Find the point where the ground occurs and repair as necessary. |
| A grounded circuit is indicated if the test lamp glows during testing. | Remove any foreign material, install the armature, then correct excessive run-out by striking the high side of the shaft near the ball bearing. |
| A strong pull or vibration on a slot indicates a shorted winding. | After testing in one position, rotate the armature slightly in the growler and repeat the test. Continue until a complete revolution of the armature has been made. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
22| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 143-0030 | Carburetor, Gas Screw, Bowl Retaining Kit, Gasket Bowl | 1 | Gasket | PartsGeek |
| 143-0097 | Screw - Throttle Stop Spring | 1 | Service part / kit | PartsGeek |
| 143-0098 | Throttle Stop Screw | 1 | Service part / kit | PartsGeek |
| 143-0100 | Shaft, Choke Screw, Machine - Round Head (#3-48 X 3/16") | 1 | Service part / kit | PartsGeek |
| 143-0110 | Plug - Idle Passage Carburetor No Longer Available, For Replacement Order Kit #146-0295. | 1 | Service part / kit | PartsGeek |
| 143-0112 | Carburetor No Longer Available, For Replacement Order Kit #146-0295. | 1 | Service part / kit | PartsGeek |
| 143-0115 | Expansion Screw - Idle Adjustment | 1 | Service part / kit | PartsGeek |
| 143-0160 | Carburetor, Gas Screw, Machine - Round Head (#3-48 X 3/16") | 1 | Service part / kit | PartsGeek |
| 143-0714 | Shaft, Throttle Needle, High Speed | 1 | Service part / kit | PartsGeek |
| 146-0091 | Bowl, Carburetor | 1 | Service part / kit | PartsGeek |
| 146-0103 | Screw, Machine with Washer Plate, Throttle | 1 | Service part / kit | PartsGeek |
| 146-0109 | No Longer Available, For Replacement Order Kit #146-0295. | 1 | Service part / kit | PartsGeek |
| 146-0112 | No Longer Available, For Replacement Order Kit #146-0295. | 1 | Service part / kit | PartsGeek |
| 146-0119 | No Longer Available, For Replacement Order Kit #146-0295. | 1 | Service part / kit | PartsGeek |
| 146-0122 | No Longer Available, For Replacement Order Kit #146-0295. | 1 | Service part / kit | PartsGeek |
| 146-0124 | Shaft, Throttle | 1 | Service part / kit | PartsGeek |
| 146-0186 | No Longer Available, For Replacement Order Kit #146-0295. | 1 | Service part / kit | PartsGeek |
| 146-0718 | Screw, Throttle Stop Spring - Throttle Stop 3crew | 1 | Service part / kit | PartsGeek |
| 148-0169 | Counterweight (Adjustable) | 1 | Service part / kit | PartsGeek |
| 148-0267 | Counterweight (hIon-Adjustable) | 1 | Service part / kit | PartsGeek |
| 148-0412 | Spring - High Speed Needle | 1 | Service part / kit | PartsGeek |
| 812-0014 | Plate, Throttle Shaft, Choke | 2 | Service part / kit | PartsGeek |
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 | |||
| Standby |
Available documents
Parts manual — 933-0220 Onan MAJ (spec A-S) Marine Genset Parts manual (03-1982) (Cummins/Onan)Service manual — 933-0501 Onan MAJ Marine Genset Engine Generator Controls Service manual 08-1974 (Cummins/Onan)