Cummins/Onan — Fan Hub Inspection
Maintenance
From a Cummins/Onan owner's manual covering: K1800, K2000E, K38, K50, KT38, KTA38, KTA50, KTTA38, KTTA50, KtA38, KtA50, KttA38. Check it applies to your exact model before use.
Applies to: Cummins/Onan K38, Cummins/Onan K50, Cummins/Onan KTA38, Cummins/Onan KTA50, Cummins/Onan K38 and K50 engine
Procedure
- Remove the fan belt.
- Rotate the fan hub pulley to check for rough or damaged bearings.
- Inspect the pulley grooves for excessive wear.
- Check for grease leakage.
- Use a dial indicator to check the bearing end clearance.
- Replace with a new or rebuilt unit as necessary.
- Install the fan belt.
Tools required
- dial indicator Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fan hub bearing end clearance: 0.03 MIN / 0.15 MAX mm [0.001 / 0.006 in]
Full service-parts list: Cummins/Onan K38 →, Cummins/Onan K50 →, Cummins/Onan KTA38 →, Cummins/Onan KTA50 →
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.