Cummins/Onan — Manual Operation (Transfer Switch)
Operation · OT III Transfer Switch
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- AC power within the cabinet and the rear side of the cabinet door presents a shock hazard that can cause severe personal injury or death. Remove all AC power before manual operation if possible.
- Automatic transfer switch operation results in rapid movement of the manual operator handles and presents a hazard of severe personal injury. Keep hands clear of handles when switching back to automatic operation.
Procedure
- Open the cabinet door of the automatic transfer switch.
- Move the Motor Disconnect switch to the Off position.
- Transfer to emergency: pull the upper manual operator handle down, then push the lower handle down.
- Retransfer to normal: pull the lower manual operator handle up, then push the upper handle up.
- Move the Motor Disconnect switch back to the Auto position (switch transfers load to the active source; Normal source if both available).
- Close the cabinet door.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.