Komatsu PW118MR-11 Operation & Maintenance Manual page 404

MAINTENANCE PROCEDURE
After the engine is stopped, the DEF system devices automatically purge the DEF in the DEF injector and DEF
pump and return it to the DEF tank to prevent malfunction of the devices caused by freezing of the DEF or dep-
osition of urea.
After the engine is stopped, the devices are still operated for a few minutes. Before replacing the filter, clean
around the DEF pump first after the DEF system devices stop.
Prepare the DEF filter removal tool.
The DEF filter is located at the positions shown in the figure.
1.
Remove the filter cap (1) at the bottom of the DEF pump,
and remove equalizing element (2).
2.
Turn the cap (4) of filter removal tool (3) and remove it.
3.
Check the installation of spacer (5).
4.
Insert the filter removal tool (3) into the bottom of the DEF
pump and thrust in with hand.
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MAINTENANCE
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