Emptying tank for reducing agent using SCR vacuum box VAS 6557 — VW

Emptying tank for reducing agent using
SCR vacuum box
VAS 6557
Special tools and workshop equipment required
Vacuum box
VAS 6557
Emptying
Note
To keep the following description as short as possible, the
“NO
x
reducing agent AUS 32”
(AdBlue
®
) is simply called a reducing agent.
WARNING
The reducing agent can irritate skin, eyes and respiratory organs.
After skin contact with this agent, wash immediately with plenty of water.
If necessary, call a doctor.
Note
Tank for reducing agent is emptied via filler neck.
Caution
Make sure that no reducing agent gets onto the trim panels or body components.
If this occurs, wash out reducing agent using clear water and a lint-free cotton cloth.
If the reducing agent has already crystallised, use warm water and a sponge.
Reducing agent that has not been removed will crystallise and damage the surface after some time.
For information on storage and disposal, see
Service net → Environment → Workshop disposal
. For country specific information about storage and disposal, ask the importer.
WARNING
Danger due to escaping reducing agent.
To prevent large amounts of reducing agent from escaping when the metering line is opened, it is necessary to wait until automatic return of the reducing agent is completed
Anchor
.
Open tank flap.
Clean area around tank flap.
Switch off ignition.
Unscrew cap
1
from filler neck for reducing agent.
Prepare
vacuum box
VAS 6557
as follows:
Close shut-off taps
A
,
B
and
C
.
Connect coupling
D
to connection on shut-off tap
A
.
Pressurise compressed air hose with compressed air.
Open shut-off tap
A
.
Now a vacuum is created in
vacuum box
VAS 6557
.
Close shut-off valve
A
as soon as the pressure gauge registers a pressure of 0.8 bar.
Disconnect coupling
D
from connection on shut-off tap
A
.
Interrupt the compressed air supply through the compressed air hose.
Guide end of hose
E
into the filler neck until it contacts the bottom of the tank for reducing agent.
Open shut-off tap
B
.
Note
The reducing agent is then drawn from the tank and into the
vacuum box
VAS 6557
by the vacuum. The capacity of the
vacuum box
VAS 6557
is 11 litres. This extracted volume is sufficient for removal of the reducing agent tank. If the tank for reducing agent holds a greater amount and the tank is to be emptied, then repeat the process.
To empty
vacuum box
VAS 6557
, hold connection on shut-off tap
C
over suitable container and open shut-off taps
A
and
C
.
Caution
Never reuse extracted reducing agent. For information on storage and disposal, see
Service net → Environment → Workshop disposal
. For country specific information about storage and disposal, ask the importer.
Flush out
vacuum box
VAS 6557
thoroughly using water when work sequence is complete.