Cummins/Onan — Serpentine Belt Replacement
Repair & overhaul · Serpentine drive belt
From a Cummins/Onan operator's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan GGHG, Cummins/Onan GGHH, Cummins/Onan V-10 WSG-1068 engine
Before you start
- The belt idler is under tension. Do not allow your hands to get between the belt and pulley. Personal injury will result.
Parts for this job
- 511-0161-21 Belt — Cummins/Onan GGHG Amazon eBay
- 511-0161-21 Belt — Cummins/Onan GGHH Amazon eBay
Part numbers from the service-parts lists for Cummins/Onan GGHG, Cummins/Onan GGHH. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Disconnect negative (–) cable from the battery.
- Remove fan guard between engine and radiator.
- Insert a 1/2 inch male square ratchet or breaker bar into the tensioner arm and slowly lift to relieve spring tension.
- Remove serpentine belt.
- Slip new serpentine belt onto all pulleys except the water pump/fan drive pulley.
- Relieve tensioner and position belt over the water pump/fan drive pulley, then slowly release spring tension onto belt.
- Install fan guard.
- Connect the negative (–) cable to the battery.
- Start genset and visually check belt alignment with engine running.
Tools required
- 1/2 inch male square ratchet or breaker bar Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spring-loaded idler maintains correct belt tension
Full service-parts list: Cummins/Onan GGHG →, Cummins/Onan GGHH →
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.