Cummins/Onan 1750DQKB — Testing the Main Stator
Testing & diagnosis
For the Cummins/Onan 1750DQKB, from the Cummins/Onan service manual.
Applies to: Cummins/Onan 1750DQKB, Cummins/Onan DQKB, Cummins/Onan DQKC
Procedure
- Disconnect all stator leads from the terminals to which they are connected.
- Using a Wheatstone bridge with at least 0.001 ohm precision, measure resistance across U1-U2, V1-V2, W1-W2, U5-U6, V5-V6 and W5-W6.
- Replace the stator if the resistance of any winding is not as specified in Tables 4-2/4-3.
- Remove and separate all leads of the generator from the generator load terminal block.
- Connect the megger between one phase of the stator and ground while grounding the other two phases.
- Repeat for the other two phases; refer to Table 4-1 for megger voltage selection.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.