The Cummins/Onan QSV91 is an engine. It powers generator sets from Cummins/Onan, including the C1540 N5C, C1540 N6C, C1750 N5C and C1750 N6C.
Also known as: QSV91, Cummins/Onan QSV91
Part of the Cummins/Onan QSV91 engine family — 2 variants share parts & fitment.
How to read your Cummins/Onan engine serial & model number →
| Code | Meaning |
|---|---|
| 121 | Speed Signal Lost (Loss of Speed Sense) |
| 234 | Overspeed |
| 1433 | Local Emergency Stop |
| 1434 | Remote Emergency Stop |
| 2335 | Excitation Fault (Loss of Voltage Sense) |
| 1416 | Fail to Shutdown |
| 1123 | Shutdown After Battle Short |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
| Part # | Description | Category |
|---|---|---|
| QSK60-G9 | Engine model for C2500 D5A generator sets | Engine |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
The Cummins/Onan QSV91 powers 4 generator set(s), including Cummins/Onan C1540 N5C, Cummins/Onan C1540 N6C, Cummins/Onan C1750 N5C, Cummins/Onan C1750 N6C.