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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. Remove AC line voltage from the automatic
  2. Remove the twist-lock disconnect plug and open
  3. Remove the wire lead from transformer T1 ter-
  4. Remove the wire lead from resistor R1 terminal

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.