3
1. Oil tank
This is a reservoir for the storage of the hydraulic oil for the oil hydraulic circuit. The oil
volume can be checked with the oil level gauge.
4. Motor
This motor is a power source to drive the hydraulic pump.
5. Magnet switch
This switch is used to start or stop the motor and is opened or closed by the activation switch
(6). An overload (thermal) relay is used to prevent motor burnout that may be caused by an
abnormal current flow during overload operation or under a constraint condition.
6. Activation switch
This is a selector switch that starts or stops the motor by opening or closing the magnet
switch.
* High pressure safety valve
This valve limits the maximum pressure to prevent damage to the machine and piping.
Equipped in the oil tank, it is factory-set to 73 MPa.
* Low pressure safety valve
This valve limits the lower pressure range to prevent damage to the machine and piping for
the low pressure circuit, as well as the overload of the motor. Equipped in the oil tank, it is
factory-set to 7.5 MPa. Do not readjust this setting.
18. Pressure switch (DPGS-70)
This switch stops the motor when the pressure rises to the set pressure, and restarts it
automatically when the pressure drops to the set differential pressure (which is factory-set to
5 MPa).
22. Directional control valve (EHV-3)
This is a manual three-way poppet valve. The hydraulic oil is discharged when the lever is
tightened and returns to the oil tank when loosened.
27. Air breather
This is a protector that prevents dirt in the air from entering the oil tank as well as ensures
ventilation in the tank. It is equipped with a backflow check valve that prevents the hydraulic
oil from leaking out during transport.
29. Oil level gauge
The amount of the hydraulic oil can be checked visually with this gauge.
34. Oil drain port
This is a port to drain the hydraulic oil from the oil tank, with a size of Rc 3/8 for taper pipe
threads.
35. Return port
This is a port to return the hydraulic oil from the circuit to the oil tank, with a size of Rc 3/8
for taper pipe threads.
36. Discharge port
This is a port to discharge the hydraulic oil to the circuit, with a size of Rc 3/8 for taper pipe
threads.
