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MAINTENANCE
If there is still fuel leakage, repeat steps 2 to 4 to remove the filter cartridge, and if any damage or pinched for-
eign material on the packing surface is found, replace it with a new cartridge and repeat steps 5 to 10 to install
it.
METHOD FOR CHECKING ALL TIGHTENING POINTS OF ENGINE INTAKE PIPE
CLAMPS
Ask your Komatsu distributor for checking the tightening of the clamps between the air cleaner - turbocharger -
aftercooler - engine.
METHOD FOR REPLACING DEF TANK BREATHER ELEMENT
Do not replace the element immediately after engine is stopped.
NOTICE
•
Komatsu recommends using Komatsu genuine parts for replacement parts.
•
If the machine is operated without DEF tank breather element attached, or with the element other
than Komatsu genuine parts, foreign materials may enter into DEF pump and DEF injector which
will cause failure of the machine. Never operate the machine without DEF tank breather element at-
tached, nor use the element other than Komatsu genuine parts.
•
Do not flush DEF tank breather element. Flushing or regenerating of it will degrade the performance
of filter, and will cause the breakage of the DEF tank. Never reuse the DEF element.
•
Always stop the engine and clean around 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 still operated for a few minutes. Replace the element
after DEF system devices stop.
•
Improper assembly of DEF tank breather element may cause leakage of DEF. Replace the element in
the correct procedure.
1.
Open the DEF tank cover on the right front of the machine.
2.
Remove nut (2) of breather assembly (1) at the top of DEF
tank, then remove cover (3).
3.
Replace element (4) with a new one.
4.
Install cover (3) and nut (2).
In order not to damage the threaded portion of nut, tighten
nut (2) by hand until it is seated, then tighten it 15 to 25 °
by using a tool.
NOTICE
If breather assembly (1) is removed for replacement,
apply a tool to bolt (5) and tighten it.
Tightening torque 6.5-8.5 Nm
k
k
WARNING
WENAM00130
MAINTENANCE PROCEDURE
RKA65260
4-65
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