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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 the front door of the cabinet.
  2. Move operation selector switch to “STOP”
  3. Disconnect the starting battery.
  4. Remove the AC line voltage from the automatic
  5. Remove the twist-lock disconnect plug and pull
  6. 400 ampere AT only: Remove the one screw from
  7. Remove the one screw on top and one screw on
  8. Swing the meter-lamp panel outward.
  9. Disconnect the meter-lamp panel wire leadsfrom
  10. Remove the four nuts and washers holding the
  11. Mount the new meter-lamp panel on the cabinet
  12. Connect the wire leads as marked, from the
  13. Close the meter-lamp panel and secure the top
  14. 400 ampere AT only: Shut the left cabinet door.
  15. Close the control accessory panel and reconnect
  16. Restore AC line voltqge to the automatic transfer
  17. Move the operation.selector switch to “RMT” (on
  18. Reconnect starting battery.
  19. 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.