Furukawa Unic URW376C4U -T Series, Operation & Maintenance Manual

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12-26
MAINTENANCE AND INSPECTION OF CARRIER
5
Pour the specified amount of speci-
fied oil into the filling port.
Capacity of hydraulic oil tank: 19.8gal(75 liters).
Filling port
Oil level gauge
★
Extension or retraction of a cylinder to its stroke ends may cause the
sealing to be damaged by the air entered into the cylinder.
★
Since hydraulic oil temperature is too high and its volume is expand-
ed immediately after the machine operation has been stopped, the oil
level gauge will not indicate the correct oil quantity. Therefore, be sure
to check the oil quantity when the oil temperature has returned to an
ambient temperature of 68~104ºF(20~40ºC).
★
There is a risk that the hydraulic oil may be spurted out if the oil is
supplied beyond the “Hi” level limit on the gauge.
Hi
Lo
(20mm)
0.78in
Middle of gauge
8
Then, allow each cylinder to repeat
extending and retracting between both
sides by 3 to 4 times.
6
Fit the filling port plug, then bleed the
air in the hydraulic system.
7
Idle the engine at low speed and repeat
extending and retracting each cylinder
between positions where it will not come to
the stroke end of either side (approx. 4in.
(10cm)before the stroke end ).
9
Put the crane at the stored position
and stop the engine.
Check the oil level gauge located in front of
the oil tank, and supply the oil as necessary.
If hydraulic oil level is checked at the operat-
ing position of the crane, the oil may be over-
supplied because hydraulic oil in each cylin-
der will not be returned to the oil tank.
Therefore, be sure to check the oil level at
the stored position.
A proper oil level should be at the middle
between “Hi” and “Lo” limits on the gauge.
CAUTION
CAUTION