Cummins/Onan — Fan Belt Replacement
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 DQKB, Cummins/Onan DQKC, Cummins/Onan QSK60 engine
Before you start
- Fan belt idler is under tension; keep hands away
Parts for this job
Part numbers from the service-parts lists for Cummins/Onan DQKB, Cummins/Onan DQKC. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Disconnect negative battery cable
- Remove fan belt guard
- Use 8-point socket/breaker bar to relieve idler spring tension and remove belt
- Slip new belt onto crankshaft and fan hub pulley
- Relieve idler spring tension to position belt, align grooves, release tension
- Install fan belt guards
- Reconnect starting batteries (negative last)
- Start genset and visually check belt alignment
Tools required
- 8-point socket and breaker bar or large wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan DQKB →, Cummins/Onan DQKC →
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.