JCB EcoMAX Engine Installation Manual
© JCB Power Systems Ltd. 320/A9164-1 Page 53 of 64
17.3.6 DEF Tank
Tank heating and defrosting is done by a line running through the tank which is linked to the
engine coolant circuit. A solenoid valve controls the coolant quantity passing through the
tank.
You must incorporate a drain plug into the tank design so you can clean and drain the
system.
To avoid false warnings or engine de-rating due to false low DEF levels, the tank design
must minimise solution surging.
Tank design may incorporate dead space at the bottom of the tank to stop the sender unit
from touching the bottom of the tank.
The tank and DEF must not be exposed to excessive heat sources. If a tank installation
close to high heat radiation is not avoidable, you must make sure that temperatures above
60°C do not occur permanently. Otherwise, tank cooling procedures will be necessary.
DEF tanks must be equipped with a ventilation system. This can either be in the form of a
tank mounted breather tube or a vented filler cap. In high ambient temperatures some DEF
solution may vaporise and create crystals on ventilation system surfaces. Under long term
exposure to high temperatures this may lead to the ventilation system becoming blocked so
it is strongly recommended that the design allows for the removal and cleaning of the
ventilation system.
17.3.7 Filler Neck/Cap
Install the filler neck so you can fill the tank from ground level in accordance with ISO
2860:1992 and be able to install a nozzle diameter of between 19 mm and 24 mm. This
allows the tank to be filled through pump nozzle or portable container while reducing the risk
of the tank being filled with Diesel (the Diesel nozzle is larger than the tank and the filler neck
opening). Despite this precaution, make sure the filler neck for the DEF solution is not
mistaken for the Diesel filler neck by the user. Ideally, you must route it to a different area of
the machine and somewhere where contaminants from surrounding components are unlikely
to fall into the tank.
You may install a strainer to stop debris entering the filler (depending on the machine
usage). The strainer must be removable for cleaning when necessary. Filter gauze size must
be a maximum of 350 μm.
Route the filler hose so that residual quantities of trapped DEF are able to defrost and not
cause a blockage when a refill is needed.
For products sold in the USA, it is compulsory for the filler neck cap to be marked with Diesel
Exhaust Fluid (DEF).
17.3.8 Coolant System Integration
Coolant lines are provided on the Industrial Power Unit to pipe coolant flow to and from the
dosing module to help prevent the component from overheating. The lines also provide Feed
and return coolant hose interfaces. This enables the installer to connect the coolant lines to
the Tank Module during installation. The coolant flows through the tank module in cold
conditions to de-frost the DEF controlled by the coolant valve. The installer must ensure the
feed and return are installed in the correct orientation, shown in Figure 17 and Figure 18.
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