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Cummins/Onan — GENERATOR SET STARTS BUT DOES NOT ASSUME LOAD (SPEC A AND B)

For these Cummins/Onan models: 15.0 HA - 21 - a, 7.5 HA - 21 - a.

Applies to: Cummins Onan 15 0 Ha 21 A, Cummins Onan 7 5 Ha 21 A

Procedure

  1. 2. Check the automatic control contactor coil. If malfunctioning, see Line Contactor under CONTROL COMPONENTS.
  2. 3. Check pull-in voltage and change setting (if necessary) of adjustable resistor forcontactor - pull-in. See Line Contactor Pull-in Adjustment under CONTROL COMPONENTS.

Source: manual:907-0500 Onan HA Auto Demand Control Service Manual (06-1984).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.