Cummins/Onan — Drive Belt Tension - Check
Maintenance
From a Cummins/Onan owner's manual covering: 6C8.3, 6CT 8.3, 6CTA8.3. Check it applies to your exact model before use.
Applies to: Cummins/Onan 6CTA8.3, Cummins/Onan C Series, Cummins/Onan 6CT8.3 engine
Procedure
- Measure the belt deflection at the longest span of the belt.
- Maximum deflection is 9.5 to 12.7 mm [3/8 to 1/2 inch].
- Alternatively use the Cummins belt tension gauge ST-1293.
- The required gauge value is 80 to 110 lbs.
Tools required
- Cummins belt tension gauge ST-1293 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Maximum deflection 9.5 to 12.7 mm [3/8 to 1/2 inch]
- Gauge value 80 to 110 lbs
Full service-parts list: Cummins/Onan C Series →
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.