Method For Replacing Def Filter - Komatsu H75051 Operation & Maintenance Manual

MAINTENANCE
The case can be installed only when its claws (16) are cor-
rectly inserted in grooves (12) of the filter body. When in-
serting, take extreme care so that the protrusion (17) in the
case is joined together with the rubber lip (18) of the ele-
ment.
7.
Fit the ring (5) to the threaded part of the body and tighten
it with hands firmly until it stops.
8.
Tighten the ring 1/15 to 2/15 turns further (1 to 2 ridges of
the ring) by using the special wrench.
If the engine is operated with the ring tightened insufficient-
ly, oil and blowby gas may leak.
9.
Install the bolt (1) which has been removed in the step 1,
and restore the KCCV drain hose.
Check the KCCV hose for leakage, crack, and loose clamp, and replace it if necessary.

METHOD FOR REPLACING DEF FILTER

Immediately after the engine is stopped, the parts are still very hot. Do not replace the filter immediately.
Wait until all of parts cool down before starting the work.
NOTICE
• Komatsu recommends using Komatsu genuine parts for replacement parts.
• If the machine is operated without DEF filter attached, or with the filter 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 filter attached, nor use the filter other than Komat-
su genuine parts.
• DEF filter cannot be flushed. Flushing or regenerating of it will degrade the performance of filter,
and will cause the breakage of DEF tank. Never reuse the DEF filter.
• Improper assembly of DEF filter may cause leakage of DEF. Replace the DEF filter in the correct pro-
cedure.
• DEF freezes at –11 °C. If it is frozen, replacement of the filter becomes difficult. Replace the filter
when the temperature around DEF pump is higher than -11 °C, and in the condition that DEF is not
frozen.
k k
WARNING
MAINTENANCE PROCEDURE
4-77