Cummins/Onan — Fan Belt Adjustment
Adjustments · Fan belt and alternator mounting bracket
From a Cummins/Onan owner's manual covering: 10HDKAG, G1250s, SKB1.5U6D2RA. Check it applies to your exact model before use.
Applies to: Cummins/Onan 10HDKAG, Cummins/Onan HDKA, Kubota V1505-E3BG engine
Before you start
- Do not operate the genset without the belt guard in place.
- Accidental starting can cause severe personal injury or death; disconnect battery cables.
Parts for this job
Part numbers from the service-parts lists for Cummins/Onan HDKA, Kubota V1505-E3BG engine. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Disconnect starting battery cables, negative cable first.
- Remove the belt guard from the front of the set.
- Loosen the bolt passing through the long slot in the alternator mounting bracket.
- Slide the alternator until tension is correct.
- Check deflection is about 0.4 inch (10 mm) with 22 pounds (10 kg) finger pressure.
- Reinstall belt guard.
Tools required
- Belt guard removal tools Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 22 pounds (10 kg) finger pressure deflects belt about 0.4 inch (10 mm) at middle
Full service-parts list: Cummins/Onan HDKA →, Kubota V1505-E3BG engine →
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.