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Home›Repair guides›GENERATOR SET WILL NOT STOP WHEN LOAD IS REMOVED (SPEC D)

Cummins/Onan — GENERATOR SET WILL NOT STOP WHEN LOAD IS REMOVED (SPEC D)

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. 1. oo Put auto-manual switch in “MANUAL” position and stop generator set with start-stop switch on engine control. Remove the lead from the load side of the contactor in the demand control. Move the auto-manual switch to “AUTO.” If engine cranks, proceed to Step 5. If engine doesn’t crank, put auto-manual switch to “MANUAL” position. Start engine with engine start-stop switch. Move auto-manual switch to “AUTO” position and generator set should stop. This indicates there was sufficient load to keep the control energized. Check load circuit for loads. . See Printed Circuit Board Tests (Spec C and D). 13 SPEC C MODELS AUTOMATIC DEMAND CONTROL WILL NOT START GENERATOR SET we LOAD (SPEC C) . Check switch positions. Auto-manual switch should be set at “AUTO,” elec-start switch at “ELEC START.”
  2. 2. Check battery terminals. Must be connected negative ground.

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.