Cummins/Onan — Alternator - Replacement

Repair & overhaul · Electrical system

From a Cummins/Onan owner's manual covering: GTA8.3, GTA8.3 CD1, GTAR 3. Check it applies to your exact model before use.

Applies to: Cummins/Onan GTA8.3 engine

Procedure

1. Disconnect the ground cable from the battery terminal.
2. Identify each electrical wire and tag indicating location.
3. Remove the drive belt.
4. Remove the capscrew from the alternator link.
5. Remove the alternator mounting capscrews.
6. Remove the alternator.
7. Position the alternator on the bracket and secure it with the mounting capscrews; do not tighten at this time.
8. Connect the alternator link to the alternator; finger tighten.
9. Tighten the alternator mounting capscrew: lower smaller capscrew 24 N.m [18 ft-lb], higher larger capscrew 43 N.m [32 ft-lb].

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.

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