Unic URW295CR, Maintenance Manual

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Feedback
Core
Working pressure
of pump is maintained
at 6Mpa or less.
Pilot pressure
3MPa
Spool
Ｐ
Main relief
valve
1
（１０−４）
Main relief valve opens when the hook has been stored
and the relief valve for storing hook is actuated.
Oil fed out of pump, while generating pressure of
6Mpa, allows surplus oil to flow into the tank.
Pressure reducing
valve
Emergency screw
Solenoid valve for unloading
Relief valve
for storing hook
Solenoid valve
for storing hook
Pressure regulator valve
Back pressure valve
Tank
Set‑bolt
10.4 Oil flow in the in‑out body when hook is being
wound up by hook storing operation
P1
Solenoid valve
for storing hook
Solenoid valve
for unlading
pressure reducing valve
Pump
Tank
Main relief valve
Relief valve for storing hook
Back pressure valve
Pressure regulator
valve
Emergency screw
(stop valve)
3.0MPa
(30kgf/cm )
20.6MPa(210kgf/cm )
Set‑bolt
(stop valve)
3.9MPa(40kgf/cm )
G.P
Pailot pressurer
G.P
1.0MPa
(10kgf/cm )
1.0MPa
(10kgf/cm )
2
2
2
2
2
Primary
pressure
Secondary
pressure
Working
pressur
Feedback
Winding up