Cummins/Onan — Fan Belt - Removal and Installation (Back Side Idler System)
Maintenance
From a Cummins/Onan owner's manual covering: K1800, K2000E, K38, K50, KT38, KTA 50 G3, KTA-50G3, KTTA50, KtA38, KtA50, KttA38. Check it applies to your exact model before use.
Applies to: Cummins/Onan K38, Cummins/Onan K50, Cummins/Onan KTA-50G3, Cummins/Onan KTA38, Cummins/Onan KTA50
Before you start
- The fan belt idler is under tension. Do NOT allow your hands between the idler and belt or fan hub.
Procedure
- Remove the back side idler end of the shock absorber, control rod, or turnbuckle.
- Loosen upper capscrew and remove lower capscrew.
- Relieve idler spring tension with an 8-point socket and breaker bar.
- Remove the fan belt.
- Install the belt on crankshaft and fan hub pulley, aligning grooves with pulley ribs.
- Rotate idler against spring and install lock washer and capscrew; torque 45 Nm.
- Install control rod or shock absorber and tighten capscrews to 60-90 Nm.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fan idler capscrew 45 Nm [35 ft-lb]
- Control rod capscrews 60 Nm [45 ft-lb] and 90 Nm [65 ft-lb]
Full service-parts list: Cummins/Onan K38 →, Cummins/Onan K50 →, Cummins/Onan KTA-50G3 →, 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.