Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›5. Preparing for Service

Cummins/Onan — 5. Preparing for Service

For these Cummins/Onan models: HGJAA (Spec A-E), HGJAB (Spec A-E), HGJAC (Spec A-C), HGJAD (Spec A-E), HGJAE (Spec A-E), HGJAF (Spec A-C).

Browse Cummins/Onan generators & specs →

Procedure

  1. Preparing for Service
  2. Control
  3. Enables cranking.
  4. Energizes the fuel pump E2 (gasoline models only).
  5. Control
  6. Depending on model:
  7. Flashes the field (F1-F2).
  8. Flashes the status indicator light during cranking.
  9. Disconnects the starter when engine speed is greater than 1300 rpm and turns the status indicator
  10. Turns on Switched B+ (remote pin J8-F).
  11. Enables output voltage two seconds after operating speed is reached.
  12. Turns off field flash.
  13. Disables output voltage.
  14. De-energizes the fuel pump and fuel cutoff solenoid or fuel injectors.
  15. Enables ignition kill.
  16. Turns off the status indicator light.
  17. Writes session data (number of cranks, minutes of operation, last fault, etc.) to non-volatile memory
  18. Removes processor power when idle 5 minutes (15 minutes, HGJAA and HGJAD).

Source: manual:HGJAA, HGJAB, HGJAC, HGJAD, HGJAE, HGJAF Service Manual.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.