Cummins/Onan — Fan belt replacement (QSA series)
Maintenance · Fan belt and cooling blower
From a Cummins/Onan service manual covering: 4A2.3, 6A3.4-GS, 6AT3.4-GS, DL4, DL6, QSA3, QSA4, QSA6. Check it applies to your exact model before use.
Applies to: Cummins/Onan DGAB, Cummins/Onan DGAC, Cummins/Onan DGAD, Cummins/Onan DGAE, Cummins/Onan DL4, Cummins/Onan DL6
Before you start
- Rubber isolators do not permit repeat torque application to bolts.
Procedure
- Disable genset by removing battery starting cables, negative cable first.
- Remove screws securing air inlet guard and box from front of genset.
- Remove cone.
- Remove four blower hub bolts and lockwashers; withdraw blower, fan spacer, and associated hardware.
- At engine compartment, slip new belt over pulley; adjust belt per engine service manual.
- Reassemble fan spacer, blower, and hardware; align eight holes so hub bolts go through four outer circumference holes.
- Snug four hub bolts, then torque in opposite progression to 9-11 foot pounds (12-15 N·m).
- Reassemble cone, air inlet guard, and air box.
- Reconnect starting battery cables, positive cable first.
- Start genset and check operation.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Blower hub bolts: 9-11 ft-lb (12-15 Amazon eBay FridayParts $19.30 N·m).
Full service-parts list: Cummins/Onan DGAB →, Cummins/Onan DGAC →, Cummins/Onan DGAD →, Cummins/Onan DGAE →, Cummins/Onan DL6 →
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.