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Cummins/Onan AT U C D ‘400 - 4X / 11 10 C — Service Procedure

For the Cummins/Onan AT U C D ‘400 - 4X / 11 10 C.

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Procedure

  1. Open cabinet door of automatic transfer switch.
  2. Move operation selector switch to “STOP” (in AT
  3. Remove AC line voltage from the automatic
  4. Remove the twist-lock disconnect plug.
  5. Completely open the control accessory panel.
  6. 400 ampere AT only: Remove the one screw from
  7. Remove the one screw on top and one screw on
  8. Loosen the latch pin on the edge of the meter
  9. 400 ampere AT only: Close the left cabinet door
  10. Close the meter panel and reinstall the two
  11. Close the control accessory panel. If more adjust-
  12. Reconnect the twist-lock disconnect plug.
  13. Restore AC line voltage to the automatic transfer
  14. Move operation selector switch to "NORMAL" (in
  15. Reconnect starting battery.
  16. Close cabinet door.

Source: manual:962-0500 Onan AT (spec A-C) Transfer Switch Service Manual (08-1979).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.