Cummins/Onan — Blower Replacement (QS-Series)
Repair & overhaul · Radiator cooling blower, shaft and bearings
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
- Disconnect starting battery cables (negative cable first)
- Accidental starting can cause severe personal injury or death
Procedure
- Shut down the set and disconnect the batteries (negative cable first).
- Remove the air inlet box and air cone.
- Remove the four blower hub bolts and withdraw the blower.
- Back out the set screw in the bearing collar and tap the collar counterclockwise until loose, then withdraw it.
- Unscrew the nuts securing the front bearing retainer.
- Remove the fan belt and shaft pulley and remove the bearing collar (tap clockwise).
- Withdraw the shaft into the blower compartment.
- Reassemble in reverse; torque blower hub bolts to 8 ft-lbs (11 Nm).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Blower hub bolt torque 8 ft-lbs (11 Nm)
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.