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MAINTENANCE PROCEDURE
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 element, and will cause the breakage of DEF tank. Never reuse the DEF element.
•
Always stop the engine and clean around DEF tank before replacing.
•
After the engine is stopped, DEF system devices automatically purge DEF in DEF injector and DEF
pump and return it to DEF tank to prevent malfunction of the devices caused by freezing of DEF or
deposition of urea.
After the engine is stopped, the devices are 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.
Remove nut (2) of breather assembly (1) on the top of the
battery cover.
2.
Remove cover (3).
3.
Replace breather (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.
METHOD FOR CHECKING FOR LOOSE ROPS MOUNT BOLTS
Check that bolts (1) for looseness or damage. (4 pieces each
on the right and left sides)
•
When any bolt is loose
Tighten the bolt.
Tightening torque: 245 to 309 Nm {25 to 31.5 kgm}
•
When any bolt is damaged
Replace the bolt with a Komatsu genuine part.
EVERY 2000 HOURS MAINTENANCE
Maintenance for every 250, 500, and 1000 hours services should be performed out at the same time.
4-60
MAINTENANCE
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