Komatsu WA470-6 2006, Operation & Maintenance Manual

Page: 322 / 392

4.9 Service procedure
Every 1000 hours service
Maintenance
4-72
WA470-6H – VEAM946100
4.9.10 Every 1000 hours service
Maintenance for every 50, 100, 250 and 500 hours service
should be carried out at the same time.
Replace fuel main filter cartridge
WARNING
!
Engine is at high temperature immediately after the machine
has been operated. Wait for engine to cool down before
replacing the filter.
!
High pressure is generated inside the engine fuel piping sys-
tem when the engine is running.
When replacing the filter, wait for at least 30 seconds after
stopping the engine to let the internal pressure go down
before replacing the filter.
!
Do not bring fire or sparks near the fuel.
NOTE
!
Genuine KOMATSU fuel filter cartridges use a special filter
that has highly efficient filtering ability. When replacing the
filter cartridge, always use a genuine KOMATSU part.
!
The common rail fuel injection system used on this machine
consists of more precise parts than the conventional injec-
tion pump and nozzle.
If any part other than a genuine KOMATSU filter cartridge is
used, dust or dirt may get in and cause problems with the
injection system. Always avoid using substitute parts.
!
When carrying out inspection or maintenance of the fuel sys-
tem, pay more attention than normal to the entry of dirt. If dirt
is stuck to any part, use fuel to wash it off completely.
!
Container to catch the fuel
!
Filter wrench
After replacing the fuel pre-filter cartridge, replace the main fuel
filter cartridge also.
1. Set the container to catch the fuel under the filter cartridge.
2. Using a filter wrench, turn filter cartridge (1) counterclock-
wise to remove it.
3. Clean the filter holder.
Coat the packing surface of the new filter cartridge thinly
with oil, then install the filter cartridge to the filter holder.
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