Cummins/Onan — Drive Belt, Cooling Fan - Remove/Install
Repair & overhaul · Cooling fan drive belt
From a Cummins/Onan owner's manual covering: B3.9, B4.5, B5.9. Check it applies to your exact model before use.
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Before you start
- The belt tensioner is spring-loaded and must be pivoted away from the drive belt; pivoting in the wrong direction can damage the belt tensioner.
- Applying excessive force opposite the windup direction can break the tensioner arm.
Procedure
- Lift the tensioner to remove the drive belt.
- Inspect the drive belt for cracks, glazing, tears or cuts, hardening, and excessive wear.
- Lift the tensioner to install the drive belt.
Source: Cummins/Onan owner's 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.