Cummins/Onan ATUC A 800 - 4X / 111 — Manual Operation of Transfer Switch
Operation
For the Cummins/Onan ATUC A 800 - 4X / 111, from the Cummins/Onan service manual.
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Before you start
- The transfer switch is mechanically interlocked. Be sure both sides of the transfer switch are open (OFF) before a closure is attempted.
Procedure
- Turn motor disconnect switch in the cabinet to off.
- Remove manual operator handle from storage position and push on shaft on side of transfer switch which is ON.
- Turn handle clockwise to OFF to open the transfer switch.
- Push handle on shaft of transfer switch side to be closed.
- Move handle counterclockwise to ON to close the transfer switch.
- Return the transfer switch to original positions before moving motor disconnect switch back to ON.
Tools required
- Manual operator handle Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.