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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 automatic transfer switch cabinet door.
  2. Move the operation selector switch on 2 to 3 wire
  3. Disconnect the starting batteries.
  4. Remove AC line voltage from the automatic
  5. Remove the wire leads between the engine con-
  6. Remove 300-0926 2 to 3 wire converter module 9
  7. Connect automatic transfer switch terminals
  8. Restore AC line voltage to the automatic transfer
  9. Connect the starting batteries.
  10. Move the operation selector switch on the engine
  11. 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.