Cummins/Onan — Installing the Load Transfer Switch
Installation · Double throw load transfer switch
From a Cummins/Onan owner's manual covering: 4UF-3N41, 4UF-3N42, 7UF-3N41, 7UF-3N42, 7UF-3N61. Check it applies to your exact model before use.
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Before you start
- If the manual transfer switch is not used, it is possible to energize the transformer from the tractor drive generator.
Procedure
- Install a double throw load transfer switch with an ampere rating large enough to carry the total load.
- Install close to the main line switch, between the main line switch and the load.
- Connect load lines to the center terminals of the transfer switch.
- Connect generator leads and main power source leads at opposite ends of the switch.
Source: Cummins/Onan owner's 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.