Cummins/Onan 1750DQKB — Drying the Windings
Repair & overhaul · generator windings
For the Cummins/Onan 1750DQKB, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 1750DQKB, Cummins/Onan DQKB, Cummins/Onan DQKC
Before you start
- Voltage must begin at zero volts and be gradually increased or equipment damage will result.
Procedure
- Remove electronics box cover; remove connector 10 from regulator output module.
- Disable generator excitation using InPower service tool (set Excitation Disable Override to Excitation Off).
- Skip to running generator fan, or bolt generator three-phase output terminals together.
- Connect positive lead to connector 10-6 (X, red wire) and negative lead to 10-3 (XX, brown wire) of a variable 12 VDC source.
- Attach clamp-on ammeter; set 12 VDC source to zero, start set, slowly increase excitation to highest current without exceeding rating.
- Run genset approximately one hour, then repeat insulation resistance tests; continue drying if indicated.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Run genset approximately one hour
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.