Mercedes-Benz OM 904-926 LA BlueTec Operating Instructions Manual page 74

Work schedules
72
®
Keep AdBlue /DEF out of the reach of chil-
dren.
H
Environmental note
Dispose of AdBlue
tally responsible manner.
You will find further information on AdBlue
DEF in the "Service products" section
( Y page 54).
Special tool 001 589 00 71 00 pump
Supply unit with pressure reservoir
:
Pressure release
;
Filling hose
=
Filling pressure gauge
?
Pump
A
X
To check the pressure: unscrew the dust
protection cap from the valve of pressure
reservoir :.
X
Screw filling hose = onto the valve of the
pressure reservoir.
X
Read the pressure on pressure gauge ?.
The pressure must be adjusted to
3.2 (±0.2) bar. The operating pressure of
3.2 (±0.2) bar may not be exceeded. Oth-
erwise malfunctions may occur in the sys-
tem.
X
Increase or reduce the pressure if neces-
sary.
X
To increase the pressure: press pump
lever A.
Adjust the pressure to 0.2 bar above the
specified operating pressure. When the fill-
®
/DEF in an environmen-
ing hose is disconnected from the valve, a
pressure loss of 0.2 bar takes place.
X
To reduce the pressure: press but-
ton ; several times.
X
Only if the pump module or the pressure
reservoir was not replaced: check the
pressure: if the pressure was increased, it
®
/
must be tested again after at least
5 minutes.
To do this, check the pressure as described
above.
If the drop in pressure is only approximately
0.2 bar, the pressure reservoir is OK.
If a greater pressure loss is apparent, the
pressure reservoir must be replaced.
X
If the pressure reservoir is OK:
Equalise the pressure loss.
X
Screw the dust protection cap onto the
valve of the pressure reservoir.
Engine brake - checking condition and
setting
Throttle valve lever in rest position