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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 automatic transfer switch cabinet door.
  2. Move operation .selector switch to “STOP” (on
  3. Remove AC line voltage from the
  4. Disconnect the starting batteries.
  5. .Remove the twist-lock disconnect plug and open
  6. Remove external wires from TB1, TB2, TB6 and
  7. Hold the flange edge of the control accessory
  8. Carefully pull outward on bottom of control
  9. Lower control accessory panel from cabinet. Top
  10. Remove the top hinge pin from control accessory
  11. Lift up new control accessory panel into cabinet,

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.