Cummins/Onan — Gear Case Cover Repair

Repair & overhaul

From a Cummins/Onan service manual — check it applies to your exact model before use.

Browse Cummins/Onan generators & specs →

Before you start

P-D-680 solvent is potentially dangerous.

Procedure

Remove crankshaft oil seal using ST-1259 puller.
Replace accessory drive oil seal.
Replace accessory drive bushing using ST-598 mandrel.
Remove minor scratches, nicks, and burrs with crocus cloth.

Tools required

ST-1259 oil seal puller Amazon
ST-598 gear cover bushing mandrel Amazon
Crocus cloth 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.

More Cummins/Onan repair guides →