Cummins/Onan 3100 series — Replacing Diodes
Repair & overhaul · Rotating rectifier assembly
For the Cummins/Onan 3100 series, from the Cummins/Onan service manual.
Applies to: Cummins/Onan GGKD
Procedure
- Make sure the replacement diode is of the correct polarity.
- Disconnect the pigtail from the terminal post and unscrew the old diode.
- Apply heat-sink compound under the head of the diode; keep compound off the threads.
- Torque the diodes to 36 to 42 in-lbs (4 to 4.8 Nm).
- Torque the pigtail terminals to 24 in-lbs (2.7 Nm).
Tools required
- Heat-sink compound Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Diodes 36 to 42 in-lbs (4 to 4.8 Nm)
- Pigtail terminals 24 in-lbs (2.7 Nm)
Full service-parts list: Cummins/Onan GGKD →
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.