Cummins/Onan 1750DQKB — Replacing Diodes
Repair & overhaul · exciter rectifier bridge
For the Cummins/Onan 1750DQKB, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 1750DQKB, Cummins/Onan DQKB, Cummins/Onan DQKC
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; make sure compound does not get on the threads.
- Torque diodes to 36 to 42 in-lbs (4 to 4.8 N•m) and pigtail terminals to 24 in-lbs (2.7 N•m).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Diodes 36-42 in-lbs (4-4.8 N•m)
- Pigtail terminals 24 in-lbs (2.7 N•m)
Full service-parts list: Cummins/Onan 1750DQKB →, Cummins/Onan DQKB →, Cummins/Onan DQKC →
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.