Cummins/Onan — Drive Belt, Cooling Fan - Adjust
Adjustments · Fan Drive Belt
From a Cummins/Onan owner's manual covering: M11, M1i Series Engines, ps200da. Check it applies to your exact model before use.
Applies to: Cummins/Onan M11 engine
Before you start
- Do not adjust belt tension to full value with the adjusting screw. Belt tension can increase when the locknut is tightened and cause reduced belt and bearing life.
Procedure
- Loosen the idler pulley shaft locknut.
- Use belt tension gauge, Part No. ST-1293, to adjust the belt to the correct tension.
- Tighten the idler pulley shaft locknut.
- Check the belt tension again to make sure the belt is not too tight.
Tools required
- Belt tension gauge, Part No. ST-1293 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Idler pulley shaft locknut torque: 190 Nm [140 ft-lb]
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.