Caterpillar — Fuel System Secondary Filter - Replace
Maintenance
From a Caterpillar owner's manual covering: C3.3, C3.3 Rental Generator Set, C4.4, C4.4 Rental Generator Set, D4D1-Up, GLE1-Up, N3X1-UP, N4R1-Up, N4X1-Up, X3B1-UP, XYC1-Up, XYD1-Up. Check it applies to your exact model before use.
Applies to: Caterpillar C3.3, Caterpillar C4.4
Before you start
- Do not use a tool to tighten the filter bowl
- Do not allow dirt to enter the fuel system
Procedure
- Turn the valves for the fuel lines (if equipped) to the OFF position.
- Place a tray under the fuel filter. Clean the outside of the filter assembly.
- Open the fuel drain (1) and drain the fuel into a suitable container.
- Element filter: remove the filter bowl (2) from the filter head (5).
- Press and rotate element (4) counterclockwise to release; remove and discard element.
- Remove O ring (3) and clean the filter bowl. Check threads for damage.
- Install a new O ring seal (3) to the bowl. Locate new element (4); press and rotate clockwise to lock.
- Install filter bowl into the top of the filter head (5). Tighten by hand and rotate 90 degrees.
- Spin-on filter: remove spin-on filter (2) with a suitable tool.
- Lubricate the sealing ring (4) with clean fuel oil. Install spin-on filter onto head (1).
- Tighten by hand until sealing ring contacts head; rotate 90 degrees.
- Open the valves for the fuel lines. Prime the fuel system.
Tools required
- Suitable filter wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Caterpillar C3.3 →, Caterpillar C4.4 →
Source: Caterpillar 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.