Cummins/Onan — Automatic Idle Adjustment
Adjustments · Governor/Idle
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Never operate plant with solenoid plunger G removed unless control toggle switch is OFF.
Procedure
- Disconnect flexible joint A from lever B.
- Snap idle switch OFF.
- Adjust governor for normal 3600 rpm no load to full load with nuts H loosened.
- Tighten lock nuts H with spring E close to sensitivity screw.
- Reconnect joint A to lever B.
- Turn stop adjusting screw F down for maximum lever movement.
- Snap idler switch ON. With no load, solenoid should reduce speed to about 1800 rpm.
- If idle speed too high, linkage C or D is too long; if too low, too short.
- With full load, solenoid plunger should drop.
- Adjust screw F so spring E is firm but not stretched.
- Tighten all locknuts.
Specs & values
- idle speed approximately 1800 rpm
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.