Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Service Procedure

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.

Browse Cummins/Onan generators & specs →

Procedure

  1. Open the automatic transfer switch cabinet door.
  2. Move operation selector switch to, “STOP” (on
  3. Disconnect the starting batteries.
  4. Remove AC line voltage from the automatic
  5. Remove the twist-lock disconnect plug and open
  6. Remove the wire lead from transformer T1 ter-
  7. Remove the wire lead from resistor R1 terminal
  8. Remove the 24-volt battery charger module 6
  9. Remove the 24- to 12-volt converter module 5
  10. Spec A and B only: Remove the 24-volt, start-stop
  11. If module 10 is a 24-volt battery voltage sensor,
  12. 400 ampere AT only: Remove the one screw from
  13. Remove the one screw on top and one screw on
  14. Swing the meter-lamp panel outward.
  15. Remove “LO BAT VOLT” lamps DS13 and “HI
  16. Close the meter-lamp panel and secure the top
  17. 400 ampere AT only: Close the left cabinet door.
  18. Close the contro! accessory panel and reconnect

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.