Cummins/Onan — Belt Tensioner - Replacement
Maintenance
From a Cummins/Onan service manual covering: 4B3.9, 4BT 3.9, 4BTA 3.9, 6B5.9, 6BT 5.9, 6BTA5.9. Check it applies to your exact model before use.
Applies to: Cummins/Onan 4B3.9, Cummins/Onan 6BTA5.9
Procedure
- Remove the drive belt.
- Remove the capscrew and replace the tensioner.
- Tighten the capscrew to 43 N•m [32 ft-lb].
Tools required
- 15 mm Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 43 N•m [32 ft-lb]
Full service-parts list: Cummins/Onan 4B3.9 →
Source: Cummins/Onan service 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.