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Cummins/Onan — The following procedures cover the removal and

A Cummins/Onan service procedure — check it applies to your exact model before use.

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Procedure

  1. Open the transfer switch cabinet door and unplug
  2. Loosen and remove the four machine screws
  3. Remove the control wiring leads from the auxil-
  4. Remove the round head machine screws that
  5. Disengage the auxiliary switch lever from the
  6. -ALIGN TERMINALS ON S3 AND S7 AS SHOWN
  7. Remove the round head machine screws and nuts
  8. Place the auxiliary switch lever in the bracket as
  9. Secure bracket to base using round head
  10. Install control wiring leads on the corresponding
  11. Place red plastic switch cover in position and
  12. Plug in the three control wiring harness plugs (Jl,
  13. Test switch for proper operation and close cabinet.

Source: manual:962-0504 Onan OT II series (spec E-F) Transfer Switch Service manual (12-1988).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.