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AFTERTREATMENT DIESEL EXHAUST FLUID
DOSING UNIT FILTER
Remove
There may be residual DEF in the filter
housing. A collection container placed below
the DEF filter cap is recommended.
Inspect the area around the seal and vent of
DEF/AdBlue® supply module filter cap for signs
of leakage.
Unscrew the DEF filter cap (1). A 27 mm wrench
can be used on the cap to aid in removal.
Remove the aftertreatment DEF filter equalizing
element (2).
Remove the old aftertreatment DEF dosing unit
filter element (3). A disposable service tool is
included with the filter to aid in filter removal.
Use the appropriate end of the tool, depending
on the color of the plastic on the filter. When
inserting the tool, a "click" sound can be heard
which indicates proper engagement with the
filter.
If the filter element and equalizing element
are removed from the aftertreatment DEF
dosing unit, they must be discarded and
replaced; regardless of condition.
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(1)
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250D9DEF01
290F6MA60
1 DEF dosing unit filter cap
2 DEF filter equalizing element
3 DEF dosing unit filter element
Clean and inspect for reuse
Inspect the aftertreatment DEF dosing unit filter
cap for cracks or holes that could create a DEF
leak path.
Check the condition of the threads on the
aftertreatment DEF dosing unit cap.
If the threads are damaged, replace the
aftertreatment DEF dosing unit filter cap.
Inspect the aftertreatment DEF dosing unit
threads. This is especially important if the
aftertreatment DEF dosing unit cap was
damaged.
If the aftertreatment DEF dosing unit threads
a r e d a m a g e d , r e p l a c e t h e e n t i r e
aftertreatment DEF dosing unit.
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250D9DEF02
(2)