Komatsu D37EX-24 Operation & Maintenance Manual page 342

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.
Items to be prepared
• DEF filter removal tool
The DEF filter is located at the position shown in the figure.
Before replacing the DEF filter, remove the mounting bolts from
the following places, and remove the cover (A).
• Inside the DEF tank filler port cover, the mounting bolts (B)
(2 pieces)
• At the bottom of the DEF tank filler port cover, the mount-
ing bolts (C) (1 piece)
• Left inside the hydraulic tank inspection cover on the left
side of the machine, the mounting bolts (D) (2 pieces)
1.
Remove the filter cap (1) at the bottom of the DEF pump,
and remove the equalizing element (2).
2.
Turn the cap (4) of filter removal tool (3) and remove it.
3.
Check the installation of spacer (5).
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MAINTENANCE