Cummins/Onan OT UCD 280 — Single Actuator Manual Operation, 100-280 Ampere Transfer Switch
Operation · Manual operator handles
For the Cummins/Onan OT UCD 280, from the Cummins/Onan service manual.
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Before you start
- Use extreme care when operating the transfer switch manually. High voltage on transfer switch terminals presents a serious personal injury hazard.
Procedure
- Move the motor disconnect switch to the DOWN, manual operation position.
- Pull either manual operator handle in the desired direction; down for emergency, up for normal.
- Automatic Transfer Switch: return the transfer switch to its preferred position.
- Return the motor disconnect switch to the UP, automatic operation position.
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.