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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 cabinet door of the automatic transfer
  2. Move the operation selectorswitch to "STOP" (on
  3. Disconnect the battery cables of the starting
  4. Remove the AC line voltage from the automatic
  5. Remove thecontrol disconnect plug and open the
  6. 400 ampere AT only: Remove one screw from the
  7. Remove generator, line and load connections
  8. Connect single-phase generator, line, and load
  9. Control accessory groups 10-15 and 20-25: For
  10. .Remove the one screw on top and one screw on
  11. Swing meter-lamp panel outward.
  12. If the meter-lamp panel is three-phase o'nly,
  13. Close the meter-lamp panel and secure the top
  14. 400 ampere AT only: Close the left cabinet door
  15. Close the control accessory panel and reconnect
  16. Restore AC line voltage to the AT.
  17. Reconnect the starting batteries.
  18. Move the operation selector to “RMT” (on engine
  19. Close the 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.