Komatsu PC138US-11 Operation & Maintenance Manual page 388

MAINTENANCE PROCEDURE
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.
5.
Check that filter removal tool (3) is fully inserted to the end.
Insert the filter to the end where you cannot thrust it in any
further.
6.
Turn the filter removal tool (3) in reverse, and remove filter
(6).
Filter (6) is removed and you can take it out together with
filter removal tool (3).
If filter (6) cannot be removed from the DEF pump, grip fil-
ter removal tool (3), pull it down, then it will be removed.
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MAINTENANCE