Replace Fuel Filters—500 Hours

CAUTION:

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High-pressure fluid remaining in fuel lines can cause serious injury. Only technicians familiar with this type of system should perform repairs. Before disconnecting fuel lines, sensors, or any other components between the high-pressure fuel pump and nozzles on engines with High Pressure Common Rail (HPCR) fuel system, wait a minimum of 15 minutes after engine is stopped.

  1. N74171
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    A - Primary Fuel Filter

    B - Secondary Fuel Filter

    C - Drain Valves

    Thoroughly clean exterior of filter elements and filter mounting areas.


  2. CAUTION: Fuel in filters may be under pressure. Open valve (C) on bottom of water separator bowl to relieve pressure prior to removing filter.

    NOTE: Use a catch pan when draining fuel and also when removing filters from the machine.

    NOTE: Fuel/water separator is part of fuel filter assembly.

    Drain water and contaminates from primary fuel filter (A) and secondary fuel/water separator filter (B) into a suitable container by opening drain valves (C) on bottom of filters.

  3. IMPORTANT:

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    A - Retaining Ring

    B - Retaining Ring

    C - Water Separator

    Always replace both filters at the same time.

    NOTE: Additional fuel will drain from filter housings.

    Lift up and rotate retaining ring (A) counterclockwise. Remove primary fuel filter and retaining ring.


  4. Lift up and rotate retaining ring (B) counterclockwise. Remove water separator fuel filter and retaining ring. Remove water separator (C).

  5. Install water separator on replacement filter.

  6. Lube filter seals with diesel fuel and install filters.

  7. Bleed fuel system. (See procedure in this section.)

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