Cummins/Onan — Fan Belt Replacement (QSG-Series)
Maintenance · Radiator cooling blower belt
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)
- Disconnect battery charger from AC source first
Procedure
- Shut down the set and disconnect the batteries (negative cable first).
- Remove the air inlet screen and box from the front of the set.
- Remove the air cone.
- Loosen the four blower hub bolts and withdraw the blower and spacers.
- Slip the old belt off and the new belt on over the top pulley.
- Reassemble the blower, lining up the four matching bolt holes.
- Tighten all four hub bolts by hand, then torque each to 8 ft-lbs (11 Nm).
- Thread the fan belt through the pulleys per the engine service manual, then reassemble the air cone, screen and box.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 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.