Case WX145 Operator's Manual page 254

PRESSURE RELEASE FROM HYDRAULIC OIL
TANK
For this operation fit the locking pin (2) laterally into
the bleeding valve (1) and air intake. Now unscrew
the valve (1) with care, until the bleeding hole opens
(you hear a hissing).
Now the residual pressure inside of working attach-
ment and of hydraulic pilot control has been
released.
Tighten the valve (1) manually and take out the lock-
ing pin (2).
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