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Home›Repair guides›Cummins/Onan›Testing the Exciter Rotor

Cummins/Onan 1750DQKB — Testing the Exciter Rotor

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

  1. Disconnect the six rotor winding leads from the terminal posts on the rectifier assembly.
  2. With a Wheatstone bridge, measure resistance across each pair of windings: U-V, V-W, W-U.
  3. Replace the whole rotor shaft assembly if resistance of any winding is not as specified in Tables 4-2/4-3.
  4. Disconnect all six exciter rotor leads from diode terminals CR1 through CR6 and isolate from ground.
  5. Connect the megger between one lead and ground and conduct the test per Table 4-1.

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.

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