Cummins/Onan — Removing the Generator Output Box
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Disconnect the negative (-) battery cable first to prevent accidental starting.
Procedure
- Disconnect the line cables and conduit; clearly mark each cable for reconnection.
- Disconnect the remote control plug-in extension harness, if provided.
- Disconnect the engine wiring harness plug-in connector.
- Disconnect all generator control leads (winding taps); mark each wire for reconnection.
- If the set has a mounted line circuit breaker, disconnect the cables and mark them.
- Attach a hoist, loosen the mounting bolts on the sides of the generator and remove the box.
Tools required
- hoist 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.