Cummins/Onan — Generator Rectifier Cleaning
Maintenance · Generator rotating rectifiers
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan YD series, Cummins/Onan J block (Series JB/JC) engine
Procedure
- Remove the generator end cover for access to the rotating rectifiers.
- Use filtered, low pressure compressed air to blow away accumulated dust on the diodes.
- Torque the diode studs to 25 ft-lbs (33 Nm).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Diode stud torque 25 ft-lbs (33 Nm)
Full service-parts list: Cummins/Onan YD series →
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.