Method For Replacing Fuel Prefilter Cartridge - Komatsu H75051 Operation & Maintenance Manual

MAINTENANCE PROCEDURE
6.
Open the engine side cover (2) on the left side of the ma-
chine.
7.
Turn filter cartridge (3) counterclockwise by using the filter
wrench, and remove it.
If this operation is performed immediately after stopping
the engine, a large amount of oil will come out, so wait for
10 minutes before starting the work.
8.
Clean filter head (4), fill the new filter cartridge with clean
engine oil, coat the seal and thread of the new filter car-
tridge with engine oil (or apply thin film of grease), then in-
stall it.
REMARK
Check that there is no old packing stuck to filter head (4). If
there is any old packing stuck to the holder, it will cause
leakage of oil.
9.
When installing the cartridge, tighten it until the sealing surface contacts filter head (4), then tighten it 3/4
turn.
10. After replacing the filter cartridge, refill with engine oil
through oil filler port (F) until the oil level is between H and
L marks on dipstick (G).
11. Run the engine at low idle for a time, then stop the engine
and check that the oil level is between H and L marks on
the dipstick. For details, see "METHOD FOR CHECKING
OIL LEVEL IN ENGINE OIL PAN, ADDING OIL (3-154)".
REMARK
When the ambient temperature is low, water or emulsified matter may stick to the dipstick, oil filler cap, etc. or
the drained oil may be milky white because of water vapor in the blowby gas. However, if the coolant level is
normal, it is not a problem.
There is no problem even if the emulsified matter cannot be removed completely after changing oil.

METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE

• Immediately after the engine is stopped, the parts are still very hot. Do not replace the filter immedi-
ately. Wait for all parts to cool down before starting the work.
• High pressure is generated inside the engine fuel piping system 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 any open flame close.
4-56
k k
WARNING
MAINTENANCE