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.
1.
Open DEF tank filler port cover.
For
the opening and closing method of the cover, see “METHOD FOR OPENING AND CLOSING DEF
TANK FILLER PORT COVER”.
2.
Remove the nut (2) of breather assembly (1) on top of the
DEF filler port.
Use a tool when the nuts are so tight to remove.
3.
Remove cover (3).
4.
Replace breather element (4) with a new one.
5.
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 30 °
by using a tool.
6.
Close the DEF tank filler port cover.
CHECK AND REPLACE ALTERNATOR DRIVE BELT TENSION AND REPLACING
ALTERNATOR BELT
• Special tools are required for checking the tension of the alternator drive belt and replacing it. Ask your Ko-
matsu distributor to perform this work.
• Since the auto-tensioner is installed, tension adjustment is not required.
MAINTENANCE MAINTENANCE PROCEDURE
4-59
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