5-50
MAINTENANCE
EVERY 4000 HOURS
REPLACING THE HYDRAULIC OIL AND
CLEANING THE SUCTION STRAINER
• Stop the engine and allow the machine
to cool down before performing
maintenance.
· The engine and the hydraulic system
and many other parts of the machine
are hot immediately after the engine is
stopped. Touching these parts will
cause burns.
· The hydraulic oil is also hot and under
high pressure immediately after the
engine is stopped.
Be careful when loosening the caps or
plugs. Working on the machine under
these conditions could result in burns
or injuries due to the hot oil spurting
out.
• Oil may spurt out if caps or filters are
removed or pipes are disconnected
before releasing the pressure in the
hydraulic system.
· Gradually loosen the vent plug to
relieve tank pressure.
· When removing plugs or screws, or
when disconnecting hoses, stand to
the side and loosen them slowly to
gradually release the internal pressure
before removing.
1. Set the machine to the hydraulic oil level
inspection posture.
Refer to “Inspecting the hydraulic oil tank
level and replenishing” on page 5-21.
2. Raise the safety lock lever to the locked
position.
EVERY 4000 HOURS
3. Open the side cover.
4. Slowly loosen the air bleeding plug (1) to
relieve the internal pressure, and then
remove the plug.
5. Loosen the bolts to take out the flange (2).
6. Remove the return filter (3).
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