Cummins/Onan — Inverter disassembly
Repair & overhaul · Inverter unit
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
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Before you start
- Except for continuous operation models, terminal 7 is hot. Operate and hold the test switch on the front panel to eliminate this voltage while disconnecting the wire.
Procedure
- Remove battery cables.
- Remove inverter unit backplate and top cover screen.
- Disconnect the inverter unit wires from terminals 6, 7, 8, 9, and 10 of TB2 in control box. Pull wires through rubber grommet into inverter unit.
- Disconnect the two heavy wires to T1 and T2 on TB5; then pull them through the rubber grommet into the control box.
- Loosen the four 7/16 inch nuts securing the inverter unit to the front plate.
- Lift the inverter unit up 1/2 inch and pull it away from the mounting plate.
- To remove the heat sinks, unscrew the 4 machine screws holding each to the case and pull them out through the bottom. Remove any necessary wires at the terminal blocks.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.