Cummins/Onan — Withdrawing the Generator From the Set
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DGBB, Cummins/Onan DGBC, Cummins/Onan DGCA, Cummins/Onan DGCB, Cummins/Onan DGDA, Cummins/Onan DGDB, Cummins/Onan DGEA, Cummins/Onan DGFA, Cummins/Onan DGFB, Cummins/Onan 4B3.9 engine
Before you start
- Never withdraw the generator leaving the rotor to hang by the drive discs
- Rotor can be damaged if it rests on the edges of the winding slot
Procedure
- Bar the engine until one of the four rotor poles points straight down.
- Attach lifting eyes and a hoist of sufficient capacity.
- Take up hoist slack and remove the two through bolts securing the generator to the rubber isolation mounts.
- Raise the generator end approximately one inch (12 mm) and block the engine under the flywheel housing.
- Lower the generator slightly so the blocks carry most of the weight.
- Remove the bolts securing the generator drive discs to the flywheel.
- Loosen all bolts securing the generator adapter casting to the flywheel housing.
- Adjust the hoist to carry full weight, remove the bolts and pull the generator away.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Raise generator end approximately one inch (12 mm)
Full service-parts list: Cummins/Onan DGBB →, Cummins/Onan DGBC →, Cummins/Onan DGCA →, Cummins/Onan DGCB →, Cummins/Onan DGDA →, Cummins/Onan DGDB →, Cummins/Onan DGEA →, Cummins/Onan DGFA →, Cummins/Onan DGFB →
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.