Cummins/Onan — Flashing the Field (Section II)
Repair & overhaul · Exciter field
From a Cummins/Onan service manual covering: 300.0 DFT, 350.0 DFU, 350.0 WF, 400.0 DFV, 400.0 WK, 450.0 DFW, 500.0 DFY, 600.0 DWV. Check it applies to your exact model before use.
Applies to: Cummins/Onan YB series
Before you start
- Do not keep excitation circuitry connected longer than 5-seconds, or damage may occur to the exciter regulator.
Procedure
- Assemble six volt supply, resistor, and diode as shown in Figure 21.
- If six volt supply not available, a 12-volt can be used; substitute a 20-ohm resistor for the 10-ohm.
- Start the generator set.
- Touch positive lead to + on rectifier bridge, and negative lead to - terminal.
- Hold leads on terminals just long enough for voltage to build up.
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 YB series →
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.