Cummins/Onan — Cranking Limiter (K3) Test
Testing & diagnosis · Cranking Limiter K3
From a Cummins/Onan service manual covering: 15.0 HA, 15.0HA-23/24D, 15.0HA-23/25D, 7.5 HA, 7.5HA-21/24D, 7.5HA-21/25D, 7.5HA-23/24D, 7.5HA-23/25D. Check it applies to your exact model before use.
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Procedure
- Check continuity of the heater.
- Check for heating during a starting cycle.
- To test circuit breaking, disconnect generator set from TB1-3 and apply a load.
- The start-run relay K9 should operate immediately.
- After any start-time delay of bilge blower and glow plugs (if equipped), the cranking limiter should heat.
- After 45 to 90 seconds, the limiter should open.
Specs & values
- 45 to 90 seconds
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.