Cummins/Onan — Replacing the CCV Filter Element
Maintenance · Crankcase vent filter
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDDC, John Deere 4045TFM engine, John Deere 6068TFM engine
Before you start
- Disconnect negative battery cable to prevent accidental starting.
Procedure
- Remove CCV housing, withdraw filter element and discard it.
- Install new element ensuring inner and outer O-ring seals seat properly.
- Reset red service indicator if popped up: unscrew clear plastic cap, push indicator down, reinstall cap.
Specs & values
- Replace when red service indicator pops up
Full service-parts list: Cummins/Onan MDDC →, John Deere 4045TFM 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.