Cummins/Onan 5.6TGHAA11381C — Testing the Rotor
Testing & diagnosis · Generator rotor
For the Cummins/Onan 5.6TGHAA11381C, from the Cummins/Onan service manual.
Applies to: Cummins/Onan TGHAA
Procedure
- Remove the brush block assembly to access the slip rings.
- For grounded winding: on the highest resistance scale, touch one probe to the rotor shaft and the other to either slip ring.
- Replace the rotor assembly if the meter does not indicate an open circuit to ground.
- For winding resistance: select the best scale to measure a 20 to 25 ohm value and touch the probes to the slip rings.
- Resolder slip ring to rotor lead connections if resistance is high; replace the rotor if windings do not meet specification.
Tools required
- Digital ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Rotor winding resistance 22.5 ohms (approx. +/-10% at 68 F / 20 C)
Full service-parts list: Cummins/Onan TGHAA →
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.