Cummins/Onan QSX15 / QSx15 — Belt Tensioner, Automatic - Inspect for Reuse
Maintenance · automatic belt tensioner
For the Cummins/Onan QSX15 / QSx15, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan QSx15, Cummins/Onan QSX15 engine
Procedure
- Verify neither top nor bottom tensioner arm stop is touching cast boss. If touching, replace alternator belt.
- Check tensioner pulley and body for cracks. Replace tensioner if cracks noticed.
- Check tensioner for dirt buildup. If condition exists, remove and steam-clean.
- Remove alternator belt.
- If tensioner pulley touches accessory drive pulley after fully relaxed, replace tensioner.
- Check bottom tensioner arm stop is in contact with bottom tensioner arm stop boss. If not, replace tensioner.
- Install alternator belt.
- Inspect for evidence of pivoting tensioner arm contacting stationary circular base. If contact, replace tensioner.
Full service-parts list: Cummins/Onan QSx15 →
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.