METHOD FOR REPLACING DEF FILTER
WARNING
Immediately after the engine is stopped, the parts are still very hot. Do not replace the filter immediately.
W
ait for all of parts to cool down before starting the work.
NOTICE
•
Komatsu recommends using Komatsu genuine parts for replacement parts.
• If the machine is operated without the DEF filter attached, or with the filter other than Komatsu gen-
uine parts, foreign materials may enter the DEF pump and DEF injector which will cause failure of
the machine. Never operate the machine without the DEF filter attached, nor use the filter other than
Komatsu genuine parts.
• The DEF filter cannot be flushed. Flushing or regenerating of it will degrade the performance of fil-
ter, and will cause the breakage of the DEF tank. Never reuse the filter.
• Improper assembly of the DEF filter may cause leakage of the DEF. Replace the DEF filter in the cor-
rect procedure.
• The 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 the DEF pump is higher than -11 °C {12.2 °F} , and in
the condition that the DEF is not frozen.
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 operated for a few minutes. Before replacing the filter, clean around
the 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 positions shown in the figure.
Before replacing the DEF filter, remove mounting bolts (B) (6
pieces), and remove cover (A).
1.
Remove filter cap (1) at the bottom of the DEF pump, and
remove equalizing element (2).
MAINTENANCE MAINTENANCE PROCEDURE
4-75
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