Method For Replacing Def Tank Filler Port Filter - Komatsu WA480-8 Operation & Maintenance Manual

MAINTENANCE PROCEDURE

METHOD FOR REPLACING DEF TANK FILLER PORT 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
• If the filter other than Komatsu genuine parts is used, foreign materials may enter the DEF pump
and DEF injector which will cause failure of the machine. Komatsu recommends using Komatsu
genuine parts for replacement parts.
• DEF tank filler port filter cannot be flushed. Flushing or regenerating of it will degrade the perform-
ance of filter, and will cause the breakage of the DEF pump. Never reuse the filter.
• Improper assembly of the DEF tank filler port filter may cause leakage of the DEF. Replace the DEF
tank filler port filter in the correct procedure.
• DEF freezes at -11 °C. If it is frozen, replacement of the filter becomes difficult. Replace the filter
when the temperature around the DEF pump is higher than -11 °C, and in the condition that the DEF
will not freeze.
• Before starting the work, clean around the DEF filler port, and be careful not to let dirt or dust get
into the tank during the work.
• If adding DEF is not easy because of the clogging in the DEF tank filler port filter, replace the DEF
tank filler port filter even when it has not reached the specified replacement time.
Items to be prepared
• Torque wrench
• Distilled water
Do not replace the DEF tank filler port filter if DEF tank is full.
DEF tank filler port filter is located at the position shown in the
figure.
1.
Park the machine on a level place.
2.
Check the sight gauge on DEF tank that the tank is not filled with DEF.
3.
Turn the cap (1) counterclockwise to remove it.
4.
Remove the bolts (2) (4 pieces).
5.
Remove the DEF tank filler (3).
6.
Remove the DEF tank filler port filter (4).
Perform the work carefully since DEF in the DEF tank filler
port filter (4) may spill out.
7.
Remove the old O-ring (5) and replace it with a new one.
Apply the distilled water as a lubricant to the new O-ring.
8.
Install the new DEF tank filler port filter (4).
9.
Install the DEF tank filler (3).
4-70
k k
WARNING
MAINTENANCE