Komatsu H75051 Operation & Maintenance Manual page 388

MAINTENANCE PROCEDURE
After the engine is stopped, DEF system devices automatically purge DEF in DEF injector and DEF pump and
return it to DEF tank to prevent malfunction of the devices caused by freezing of DEF or deposition of urea.
After the engine is stopped, the devices are operated for a few minutes. Before replacing the filter, clean around
the DEF pump first after DEF system devices stop.
Items to be prepared
• DEF filter removal tool
• Torque wrench
1.
Remove the bolts (1) (5 pieces) to remove cover (2).
The DEF filter is located at the positions shown in the fig-
ure.
2.
Remove filter cap (3) at the bottom of DEF pump, and re-
move equalizing element (4).
3.
Turn cap (6) of filter removal tool (5) and remove it.
4.
Check the installation of spacer (7).
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MAINTENANCE