Replace Prefilter Element (Tier 2/Stage II and Tier 3/Stage III)

1. 
   CQ298943-UN-08APR15

   A - Drain Valve

   B - Water Separator Bowl

   C - Prefilter Element

   D - Seal

   E - Seal

   F - Filter Housing

   Close fuel shutoff valve. See Fuel Shutoff Valve in Maintenance—As Required section.

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2. Thoroughly clean fuel prefilter assembly and surrounding area to keep from getting dirt and debris into fuel system.

3. CAUTION: Fuel in filter is under high pressure. Open drain valve on bottom of fuel prefilter to relieve pressure before removing filter.

   NOTE: Catch fluids with an approved container and dispose of according to employer and government guidelines.

   Connect a fuel drain line to filter drain valve (A) on bottom of prefilter and drain all fuel. Close drain valve.

4. Remove and retain water separator bowl (B) from filter element. Remove and discard prefilter element (C).

5. Clean water separator bowl with compressed air.

6. Inspect filter housing and filter canister sealing surfaces. Clean as required.

7. Place new seal (D) on water separator bowl. Lubricate seal with clean diesel fuel.

8. Install water separator bowl onto new prefilter element. Tighten water separator bowl 1/2 of a turn after seal contacts prefilter element.

9. Lubricate new prefilter element seal (E) with clean diesel fuel and install prefilter assembly to filter housing (F).

10. Tighten prefilter element 1/2—3/4 of a turn after seal contacts filter housing.

11. Open fuel shutoff valve.

12. NOTE: The hand pump on fuel prefilter is not required to be used. The electric priming system is sufficient to prime the fuel system.

    Turn key to ON for 60 s to prime the fuel system before starting engine.

    NOTE: If necessary, turn key switch off and on again to prime the system again before starting.