12.
Tighten the filter cap (1).
Tightening torque: 20 to 25 Nm {2.0 to 2.5 kgm} 
13.
Close the cover and fix it with bolts.
METHOD FOR REPLACING DEF TANK BREATHER ELEMENT
WARNING
Immediately after the engine is stopped, the parts are still very hot. Do not replace the element immedi-
ately. Wait 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 tank breather element attached, or with the element oth-
er than Komatsu genuine 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 tank breather element
attached, nor use the element other than Komatsu genuine parts.
• The DEF tank breather element cannot be flushed. Flushing or regenerating of it will degrade the
performance of element, and will cause the breakage of the DEF tank. Never reuse the DEF element.
• Always stop the engine and clean around the DEF tank before replacing.
• After the engine is stopped, the DEF system devices automatically purge the DEF in the DEF injec-
tor and DEF pump and return it to the DEF tank to prevent malfunction of the devices caused by
freezing of the DEF or deposition of urea.
After the engine is stopped, the devices are operated for a few minutes. Replace the element after
the DEF system devices stop.
• Improper assembly of the DEF tank breather element may cause leakage of the DEF. Replace the
element in the correct procedure.
For the machine with rear fender, operate lever (a) downward,
and open cover (b) before the work.
MAINTENANCE PROCEDURE MAINTENANCE
4-84
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