Cummins/Onan — Surge Suppresser Testing and Replacement
Repair & overhaul · Rotating rectifier assembly surge suppresser
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DQAD, Cummins/Onan DQAE, Cummins/Onan DQAF
Procedure
- Remove the suppresser.
- Replace the suppresser if it appears to have overheated.
- Replace if ohmmeter readings indicate less than infinite resistance (end of scale) in both directions.
- Torque the terminals to 24 in-lbs (2.7 N-m) when reassembling.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Terminal torque 24 in-lbs (2.7 N-m)
Full service-parts list: Cummins/Onan DQAD →, Cummins/Onan DQAE →, Cummins/Onan DQAF →
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.