SECTION 4
4-74
INJECTORS - REPLACEMENT
Consult your Dealer.
HYDRAULIC SYSTEM AND TANK -
PRESSURE RELEASE
HYDRAULIC SYSTEM PRESSURE RELEASE
Place the working attachment on the ground.
Shut off the engine.
Turn the ignition key to position “I” (ignition ON).
Activate the pilot control.
Activate both hydraulic control levers or pedals in
both directions required for the works at hand.
Set the ignition key to position “0” (ignition OFF).
Disconnect the pilot control.
Before activating the cylinders, equipped with break
protection valves, pay particular attention, because
after the activation of the hydraulic control lever or
pedals, some residual pressure may be present
inside of the cylinder.
- On lifting cylinders with break protection valve at
bottom side. This residual pressure can be dis-
charged by lifting the undercarriage of about
10 cm (3.93 in).
During this operation the machine leans on the
cylinder head side allowing the cylinder bottom to
release the pressure.
- On adjusting cylinders with break protection valve
at cylinder head side. This residual pressure may
release, by retracting nearly completely the con-
cerned cylinder and by lifting the undercarriage of
about 10 cm (3.93 in) with the attachment com-
pletely extended. During this operation the
machine leans on the cylinder bottom side allow-
ing the cylinder head to release the pressure.
S WARNING S
Only unpressurized hydraulic systems may be
opened. Even if the machine is parked in horizontal
position, with its attachment supported on the
ground and the engine shut off, there may still be
substantial residual pressure in parts of the hydrau-
lic system:
- the primary pressure of the last hydraulic move-
ments, before the machine stop;
- the secondary pressure, produced by the
machine own weight or by the attachment single
elements. The secondary pressure is present,
until the component creating the pressure is set
to rest position, for instance by means of
mechanical supports, that allow to clear off the
supporting function of the hydraulic system.
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