Changing Diesel Exhaust Fluid (DEF) Dosing Unit Filter

CAUTION: Avoid contact with eyes. In case of contact, immediately flush eyes with large amounts of water for a minimum of 15 minutes. Reference the Materials Safety Data Sheet (MSDS) for additional information.

IMPORTANT: If DEF is spilled or contacts any surface other than the storage tank, immediately clean the surface with clear water. DEF is corrosive to painted and unpainted metallic surfaces and can distort some plastic and rubber components.

Spilled DEF, if left to dry or if only wiped away with a cloth, will leave a white residue. Improperly cleaned DEF spill can interfere with diagnosis of Selective Catalytic Reduction (SCR) system leakage problems.

NOTE: See your John Deere equipment technical manual or OEM manufacturer’s technical manual for DEF dosing unit filter location.

IMPORTANT: Avoid system and filter damage. Before changing the filter, ensure that the DEF system is not frozen. If system is frozen, operate engine until system defrosts completely.

1. Remove screws and cover.

   
   LX372939-UN-28JAN21

   Remover Cover

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2. Loosen the cover (A) of the filter of the DEF dosing unit by one thread.

   
   LX372936-UN-28JAN21

   Carefully tilt up the housing

   A - DEF Dosing Unit Filter Cover

   E - Bolts

   F - DEF dosing unit housing

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3. Remove the screws (E).

4. As shown, carefully tilt the housing (F) up a little without bending or damaging the cables.

5. Remove DEF dosing unit filter cover (A).

   
   RG22534-UN-21MAR13

   DEF Dosing Unit Filter

   A - DEF Dosing Unit Filter Cover

   B - DEF Dosing Unit Filter Equalizing Element

   C - DEF Dosing Unit Filter Tool (supplied with new filter)

   D - DEF Dosing Unit Filter

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6. Remove and discard DEF dosing unit filter equalizing element (B).

7. NOTE: DEF dosing unit filter tool (C) is supplied with replacement filter.

   Insert “Black” end of DEF dosing unit filter tool (C) into DEF dosing unit filter (D) until CLICK is felt or heard indicating DEF dosing unit filter tool is fully engaged.

8. NOTE: A tool such as a screwdriver can be inserted into DEF dosing unit filter tool slot to assist removal.

   Pull DEF dosing unit filter tool and DEF dosing unit filter from DEF dosing unit. Discard DEF dosing unit filter and filter tool.

9. Clean DEF dosing unit threads and mating surfaces with distilled water.

10. Lubricate DEF filter O-rings with clean DEF. Carefully insert DEF dosing unit filter into the DEF dosing unit.

11. Insert the new balancing element into the filter of the DEF dosing unit.

12. Position the cover (A) of the filter of the DEF dosing unit and screw on about two threads. DO NOT screw in tight.

    
    LX372936-UN-28JAN21

    Carefully position housing

    A - DEF Dosing Unit Filter Cover

    E - Bolts

    F - DEF dosing unit housing

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13. Position the housing (F) carefully without bending or damaging the cables.

14. Position the screws (E) and tighten them to the specified torque.

    • Only on 6090M to 6120M tractors without bracket with a wheelbase of 2400 mm (94.5 in).

    Item	Measurement	Specification
    DEF dosing unit housing on fuel tank	Torque	17 N·m (150 lb·in)

    • On all tractors with bracket. NOT for 6090M to 6120M tractors with a wheelbase of 2400 mm (94.5 in).

    Item	Measurement	Specification
    DEF dosing unit housing on bracket	Torque	25 N·m (221 lb·in)

15. Tighten DEF dosing unit filter cover (A) to specified torque.

    Item	Measurement	Specification
    DEF Dosing Unit Filter Cover	Torque	23 N·m (204 lb·in)

16. Position cover bolts and tighten to specified torque.

    
    LX372939-UN-28JAN21

    Position Cover

    Item	Measurement	Specification
    Dosing unit cover	Torque	25 N·m (221 lb·in)

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