SHOP MANUAL
Engine
Ch 1 page 40
Start-up instruction for new SCR Pump
If an SCR pump has not been used for a long period of time, the check valves could seize and
become jammed due to crystalized urea in the valves resulting in lack of system pressure. This could
also be a problem on new spare part pumps that have spent a long time in stock.
Nowadays reductant with an extremely low concentration is used when testing these pumps in
production. Reductant with low con-centration reduces the risk of this problem occurring.
Nonetheless, local stocks may still have the old pumps.
Use soap water! It is strictly forbidden to use SILICONE or VASE-
LINE in any parts of the UREA system.
Pressurize the intake (suction side) of the SCR pump for 3 seconds
with compressed air 6-10 bar.
The suction side of the pump is marked "IN". Always carry out this
procedure before fitting a spare part pump.
This action may also be needed after long time without using the
machine
NOTE
To locate pump inlet, follow hose marked in picture 59.
NOTE
Figure 61
Figure 60
Folow line on picture 59 to locate pumpe inlet.
Suction line inlet on SCR pump
Figure 63
Figure 62
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