Komatsu HM400-5, Operation & Maintenance Manual

Page: 390 / 446

Apply lubricant to the spherical sliding portion of the exhaust pipe of the dump body heating unit (if equipped).
There are 2 spherical sliding portions, (1) and (2). Apply lubri-
cant to both of them.
1.
Clean hatched portion (3) thoroughly.
2.
Apply dry film lubricant until the base metal is invisible.
3.
Dry for 1 hour.
4.
When tightening bolts (4) (6 pieces), apply seizure preven-
tion and rust prevention lubricant to the underhead of the
bolts.
5.
Install bolts (4) (6 pieces).
6.
Slide the spherical parts to spread the lubricant thoroughly.
METHOD FOR REPLACING DEF TANK BREATHER ELEMENT
k k
WARNING
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 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.
MAINTENANCE PROCEDURE MAINTENANCE
4-68