Method For Replacing Def Tank Breather Element - Komatsu H70051 Series Operation & Maintenance Manual

MAINTENANCE
8.
Slide filter (8) down, and remove spacer (7) from filter re-
moval tool (5).
9.
Pull filter (8) up while pushing in the tip of filter removal
tool (5), and remove it.
10. Return the removed spacer (7) to filter removal tool (5),
and keep them.
11. Insert a new filter and a new equalizing element into the
bottom of DEF pump, and lightly tighten them with hand.
12. Tighten filter cap (3).
Tightening torque: 20 to 25 Nm {2.0 to 2.5 kgm}
13. Install cover (2) with bolts (1) (6 pieces).

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 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.
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WARNING
MAINTENANCE PROCEDURE
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