Cummins/Onan — Check Auxiliary Water Pump

Maintenance · Cooling system

From a Cummins/Onan service manual covering: GNH-250, GNH-XI0, GNHC4, GNVH450, GV12, GV12 series, GV12-525. Check it applies to your exact model before use.

Applies to: Cummins/Onan GV12

Procedure

1. Check all pipes and fittings for leaks; tighten as necessary.
2. Remove cover plate to drain pump.
3. Lift out rubber impeller; check for cracks, breaks, damage.
4. Clean out sediment; install new impeller if necessary.
5. Install new cover plate gasket; use 0.015 inch gasket for proper clearance.
6. Install cover on pump.

Full service-parts list: Cummins/Onan GV12 →

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.

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