Komatsu HB365LC-3 Operation & Maintenance Manual page 430

MAINTENANCE PROCEDURE
5.
Check that the filter removal tool (3) is fully inserted to the
end.
Insert the filter removal tool to the end where you cannot
thrust it in any further.
6.
Turn the filter removal tool (3) in reverse, and remove the
filter (6).
Filter (6) is removed and you can take it out together with
the filter removal tool (3).
If filter (6) cannot be removed from the DEF pump, grip the
filter removal tool (3), pull it down, then it will be removed.
7.
Slide the filter (6) down, and remove spacer (5) from filter
removal tool (3).
8.
Pull the filter (6) up while pushing in the tip of filter removal
tool (3), and remove it.
9.
Return the removed spacer (5) to the filter removal tool (3),
and keep them.
10. Insert a new filter and a new element into the bottom of
DEF pump, and lightly tighten them with hand.
11. Tighten the filter cap (1).
Tightening torque: 20 to 25 Nm {2.0 to 2.5 kgm}
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MAINTENANCE