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Cummins/Onan — Governor adjustment without booster

Adjustments

From a Cummins/Onan owner's manual covering: 10CW-150R, LOCW-150 R/, LOCW-3R/12 F. Check it applies to your exact model before use.

Applies to: Cummins/Onan 10CW-150R, Cummins/Onan Spec A, Cummins/Onan Spec B, Cummins/Onan Spec C, Cummins/Onan Spec D, Cummins/Onan Spec E, Cummins/Onan Spec F, Cummins/Onan Spec G

Procedure

  1. Check throttle stop lever clearance approximately 1/32 inch.
  2. Start and run at light load to thoroughly warm up.
  3. At no load, turn speed adjusting nut for 60-63 cycles (60 cycle plant) or 50-53 cycles (50 cycle).
  4. Apply full load; governor should keep frequency spread within 3 cycles.
  5. If spread more than 3 cycles, turn sensitivity screw clockwise half turn and compensate with speed nut.
  6. Check performance under various loads.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • 60-63 cycles no load for 60 cycle plant
  • 50-53 Amazon eBay cycles no load for 50 cycle plant
  • 3 cycle spread maximum

Full service-parts list: Cummins/Onan 10CW-150R →, Cummins/Onan Spec A →, Cummins/Onan Spec B →, Cummins/Onan Spec C →, Cummins/Onan Spec D →, Cummins/Onan Spec E →, Cummins/Onan Spec F →, Cummins/Onan Spec G →

Source: Cummins/Onan owner's 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.

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