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Releasing Hose Rupture Valve (Machine Equipped with
Hose Rupture Valve) (Optional)
The hose rupture valve prevents sudden falling of the front
attachment in the event of hose breaks during machine
operation. It is located on the rod side of the arm cylinder and
bottom side of the boom cylinder.
d
WARNING:
Never attempt to operate the hose rupture valve
unless emergency. Failure to do so may result in
serious accident.
Loosen the hose rupture valve slowly. If adjustment
screw (4) is loosened rapidly, the arm or boom may
lower rapidly.
To lower the front attachment in case of emergency such as a
fault is generated while raising the front attachment, operate
the valve by following the procedure given below.
1. Remove cap (1) from the valve.
2. Put the matching marks on plug (2), lock nut (3) and
adjustment screw (4) for assembling.
3. Loosen lock nut (3). Securely tighten adjustment screw
(4).
IMPORTANT: Note turn number of the adjustment screw.
It is used for returning the adjustment screw to its
original state.
4. Lower the front attachment by operating the overload
relief valve on the control valve.
After checking that the front attachment is completely
lowered, return the overload relief valve to its original
state.
(Refer to "Releasing Overload Relief Valve" on the next
page.)
5. Return adjustment screw (4), lock nut (3), plug (2) and
cap (1) of the hose rupture valve to their original state.
Tightening torque: 10 to 14 N∙m (1 to 1.4 kgf∙m)
OPERATING THE MACHINE
5-25
Boom Cylinder
Hose Rupture Valve for Arm
Arm Cylinder
Hose Rupture
Valve for Boom
MADC-05-001
MADC-05-002
1
MADC-05-003
2
3
4
MADC-05-004
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