Cummins/Onan — Wall Mounting the Transfer Switch
Installation · 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
- Improper lifting can cause severe personal injury. Have sufficient manpower for lifting and mounting the cabinet.
Procedure
- Check the location to be sure no wires, plumbing, gas, or exhaust lines run behind the wall.
- Install two mounting bolts in the wall for the top cabinet mounting keyholes.
- With the shipping box upright, carefully remove the top and sides of the box.
- Raise the cabinet and mount it on the two top mounting bolts in the wall.
- Install two bottom mounting bolts but do not tighten.
- Push the cabinet against the wall; shim the mounting bosses if it will not align flush.
- Tighten all mounting bolts.
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.