METHOD FOR REPLACING AdBlue/DEF FILTER
WARNING
Immediately after the engine is stopped, the parts are still very hot. Do not replace the filter immediately.
Wait until all of parts cool down before starting the work.
NOTICE
• Komatsu recommends using Komatsu genuine parts for replacement parts.
• If the machine is operated without AdBlue/DEF filter attached, or with the filter other than Komatsu
genuine parts, foreign materials may enter into AdBlue/DEF pump and AdBlue/DEF injector which
will cause failure of the machine. Never operate the machine without AdBlue/DEF filter attached, nor
use the filter other than Komatsu genuine parts.
• AdBlue/DEF filter cannot be flushed. Flushing or regenerating of it will degrade the performance of
filter, and will cause the breakage of AdBlue/DEF tank. Never reuse the filter.
• Improper assembly of AdBlue/DEF filter may cause leakage of AdBlue/DEF. Replace the
AdBlue/DEF filter in the correct procedure.
• AdBlue/DEF freezes at –11 °C (12.2 °F). If it is frozen, replacement of the filter becomes difficult. Re-
place the filter when the temperature around AdBlue/DEF pump is higher than -11 °C (12.2 °F), and
in the condition that AdBlue/DEF is not frozen.
After the engine is stopped, AdBlue/DEF system devices automatically purge AdBlue/DEF in AdBlue/DEF injec-
tor and AdBlue/DEF pump and return it to AdBlue/DEF tank to prevent malfunction of the devices caused by
freezing of AdBlue/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 AdBlue/DEF pump first after AdBlue/DEF system devices stop.
Items to be prepared
• AdBlue/DEF filter removal tool
The AdBlue/DEF filter is located at the positions shown in the
figure.
Before replacing AdBlue/DEF filter, prepare the following.
• Remove grease pump (A) and grease pump holder (B).
• Remove mounting bolts (C), and move fuel prefilter (D) to-
ward the front of the machine.
1.
Remove filter cap (1) at the bottom of AdBlue/DEF pump,
and remove equalizing element (2).
MAINTENANCE PROCEDURE MAINTENANCE
4-90
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