Cummins/Onan — Cooling Fan Inspection
Maintenance
From a Cummins/Onan owner's manual covering: 4B3.9, 4BT 3.9, 4BTA 3.9, 6B5.9, 6BT 5.9, 6BTA5.9, B5.9-160, B5.9-175, B5.9-190, B5.9-210, B5.9-230. Check it applies to your exact model before use.
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Before you start
- Never pull or pry on fan; fan blade failure can cause injury.
Procedure
- Visually inspect fan daily.
- Check for cracks, loose rivets, bent or loose blades.
- Check fan is securely mounted.
- Tighten capscrews if necessary; replace damaged fan.
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.