Cummins/Onan — Control disassembly
Repair & overhaul · Control box
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
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Before you start
- Disconnect normal AC power source ahead of Instapac.
Procedure
- Disconnect normal ac power source ahead of Instapac.
- Remove wires from Line-Load terminals on TB1.
- Remove all remaining wires connected to the right side of TB2 and wires on left side to terminals 4, 5, and 6.
- Remove 4 screws securing control box to output transformer, then remove control box. Carefully guide wires through rubber grommets in box to avoid kinks or breakage.
- Remove four 7/16 inch nuts securing output transformer to front plate, then remove transformer.
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.