Cummins/Onan — Checking low-oil-pressure cut-off switch
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Throw MANUAL START-REMOTE START switch to MANUAL START and start the engine.
- If oil pressure does not build up normally, do not operate the engine until trouble is corrected.
- If oil pressure is normal but switch is suspected, disconnect wires from the switch.
- Throw switch to REMOTE START and start the engine electrically.
- If engine runs normally but stops when wires are connected, replace the cut-off switch.
Specs & values
- Contacts open below 6 pounds per square inch
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.