Mercedes-Benz OM 904 LA Operating Instructions Manual page 74

Work schedules
72
®
AdBlue /DEF pump/filter unit
Pump module
:
Filter element
;
O-ring
=
Filter bowl
?
Dust protection cap
A
Hose clamp 000 589 54 37 00
X
Clamp the feed and return lines on the
pump/filter unit using hose clamps.
X
Place a suitable receptacle under the
pump/filter unit to collect any AdBlue
DEF fluid that escapes.
X
Unscrew filter bowl ? from the pump/fil-
ter unit.
X
Remove filter element ;.
X
Smear O-ring = on new filter element ;
thinly with MB silicon grease before assem-
bly.
X
Insert new filter element ; into filter
bowl ?. Use MB silicon grease as a lubri-
cant.
X
Screw filter bowl ? into pump module :
and tighten. Tightening torque: 32 Nm.
! Only MB silicon grease is permissible as
a lubricant. Use MB silicon grease very
sparingly, otherwise damage to the exhaust
gas aftertreatment system could result.
The system is self-bleeding and does not
need to be bled manually.
Filling the AdBlue
ervoir
Important safety notes
G
WARNING
®
If the AdBlue
temperatures, ammonia vapours may escape.
Ammonia vapours have a pungent odour and
particularly irritate:
skin
R
mucous membranes
R
eyes
R
The vapours may cause a burning sensation
in the eyes, nose and throat as well as irrita-
tion of the throat and watering eyes.
Avoid inhaling ammonia vapours.
G
WARNING
®
AdBlue /DEF must not come into contact
with skin, eyes or clothing.
®
If AdBlue /DEF comes into contact with
R
your eyes or skin, rinse affected areas with
®
/
clean water immediately.
®
If AdBlue /DEF is swallowed, immediately
R
rinse your mouth out with a lot of clean
water and drink plenty of water.
Change clothing that is soiled with
R
®
AdBlue /DEF immediately.
If allergic reactions occur, consult a doctor
R
immediately.
®
/DEF pressure res-
/DEF tank cap is opened at high