Cummins/Onan — Fan Belt Replacement (Model DFLC)
Repair & overhaul · Fan belt / idler
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFLB, Cummins/Onan DFLC, Cummins/Onan DFLE, Cummins/Onan KTA50 engine
Before you start
- The fan belt idler is under tension; do not allow hands between idler and belt or fan hub.
Procedure
- Remove safety cage and fan belt guard.
- Loosen the two capscrews on both ends of shock absorber, remove disconnected hardware.
- Use an 8-point socket and breaker bar (or large wrench) to hold idler against spring tension; slowly relieve tension.
- Remove the fan belt.
- Support fan assembly with overhead hoist and sling around spacer.
- Remove six capscrews from fan support bracket; move fan assembly toward radiator.
- Slip new belt behind disconnected fan support bracket onto crankshaft and fan hub pulley.
- Reinstall fan support bracket, torque capscrews to 165-175 lb ft (186-197 N·m).
- Relieve sling tension, remove sling.
- Align belt grooves on pulley ribs.
- Reinstall shock absorber with capscrews, washers, spacers.
- Recheck belt alignment.
- Install fan belt guard and safety cage.
- Reconnect starting batteries (negative last); start genset and check belt while running.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fan support bracket capscrews: 165-175 lb ft (186-197 N·m)
Full service-parts list: Cummins/Onan DFLB →, Cummins/Onan DFLC →, Cummins/Onan DFLE →
Source: Cummins/Onan operator'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.