Cummins/Onan 12.0 RDJC — Fan Belt Adjustment
Adjustments
For the Cummins/Onan 12.0 RDJC, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan RDJC
Before you start
- Be sure to tighten nut securely.
Parts for this job
Part numbers from the service-parts list for Cummins/Onan RDJC. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Loosen the nut on the belt tightener pulley shaft.
- Move the shaft left or right in the elongated slot in the pulley mounting bracket.
- Adjust until a deflection of 1/2 inch (13 mm) is obtained with about 15 pounds (67 N) of force.
- Apply force at a point midway between the water pump pulley and belt tightener pulley.
Specs & values
- 1/2 inch (13 mm) deflection at 15 lb (67 N)
Full service-parts list: Cummins/Onan RDJC →
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.