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Cummins/Onan 5.0GenSet ES 1348 — Setting Idle Adjustment Screw for Carburetor

For the Cummins/Onan 5.0GenSet ES 1348.

Applies to: Cummins Onan 5 0Genset Es 1348

Before you start

  • When determining fuel mixture settings, never force the fuel mixture adjustment needles against their seats. Forcing will damage the needles and seats and make accurate adjustment impossible.

Procedure

  1. Remove all loads and connect a tachometer or frequency meter to the alternator.
  2. Rotate the throttle counter-clockwise and hold against its stop.
  3. Turn the idle adjustment screw IN (clockwise-lean) until set RPM or frequency drops.
  4. Turn the idle adjustment screw OUT (counter-clockwise-rich) until set RPM or frequency drops again.
  5. Over a narrow range between these two settings, the alternator RPM or frequency will remain at its highest. Turn the idle adjustment screw to the mid-point of these two settings.

Tools required

  • Tachometer or frequency meter

Source: manual:919-0120 Onan P-Series (spec J) Portable Genset Operators manual (12-1981).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.