1.
Select the level and firm ground, retract the
arm cylinder and bucket cylinder to the
stroke end, and lower the boom to place
the bucket and dozer on the ground,
placing the machine in the "hydraulic oil
inspection position" as shown to the right
figure.
2.
For the hydraulic pilot type, move the
control lever for the circuit to release the
internal pressure immediately before
stopping the engine with low idle.
3.
For the manual type, internal pressure can
be released by operating the control lever
after stopping the engine.
4.
Move the pilot control shut-off lever to the
"LOCKED" position.
5.
Stop the engine.
(Turn the starter switch to the "OFF"
position.)
6.
Open the right side cover and support it
with the stay.
7.
Press the rubber cap of air breather (2)
on the top of hydraulic oil tank (1) several
times (5 - 7 times) to release the internal
pressure of the hydraulic oil tank.
8.
Now the pressures in the hydraulic system
and hydraulic oil tank is released. You can
start the inspection and maintenance of
the hydraulic system.
4
4.9
RELEASING INTERNAL PRESSURE IN HYDRAULIC OIL AND
HYDRAULIC SYSTEM
Release the internal pressure in the hydraulic system before the maintenance including attachment
and detachment of the hydraulic components such as hydraulic oil, return filter, suction strainer and
cylinder.
4.9.1
RELEASING INTERNAL PRESSURE IN HYDRAULIC SYSTEM
Inside of the hydraulic oil tank is dangerous because it is a high temperature and pressurized.
Before removing the filler port plug, stop the engine and then press the top of the rubber cap or
loosen the flange slowly to release the pressure.
Hydraulic Oil Inspection Position
Internal pressure of the hydraulic system cannot be released without using the above procedures.
[
4. INSPECTION AND MAINTENANCE
]
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