Komatsu HM400-5, Operation & Maintenance Manual

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3.
Remove drain plug (2).
4.
Install the drain hose on the back of the hydraulic tank cov-
er.
5.
When draining the oil, loosen drain valve (3) slowly so that
you will not get oil on yourself.
Be careful not to loosen drain valve (3) too far and deform
the stopper pin inside the valve.
6.
Inspect the drained oil.
If there are excessive metal particles or foreign material,
contact your Komatsu distributor.
7.
Tighten drain valve (3) and drain plug (2).
Tightening torque: 68.6±9.8 Nm {7±1 kgm}
8.
Turn filter cartridge (4) counterclockwise by using the filter
wrench, and remove it.
When doing this, to prevent get splashed with drained oil,
do not perform this operation right under the cartridge.
In particular, if this work is performed immediately after
stopping the engine, a large amount of oil will come out, so
wait for 10 minutes before starting the work.
9.
Clean the filter head.
10. Fill the new filter cartridge with clean oil.
11. Apply oil (or thinly apply grease) to the packing surfaces
and thread portion.
12. Install the filter cartridge.
When doing this, be careful not to damage the outside cylinder of the cartridge.
When installing the filter cartridge, tighten until the packing face is in contact with the filter head, then tight-
en a further 3/4 to 1 turn.
13. Add the specified amount of oil through oil filler port (F).
14. Run the engine at low idle for a while.
15. Check that the engine oil level is in the specified range.
For the method to check the engine oil level, see “METHOD FOR CHECKING OIL LEVEL IN ENGINE OIL
PAN, ADDING OIL (3-156)”.
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
k k
WARNING
• Just after the engine stops, all parts are still very hot, so do not replace the filter immediately.
Wait until all of parts 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.
MAINTENANCE MAINTENANCE PROCEDURE
4-49