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1   Hydraulic motor:
orbit or piston motor.
2   Negative brake:
it is composed of alternating bronze and  steel disks connected  to  the  motor  shaft  and  the  body  of  the winch; pressurized oil from the hydraulic circuit opens the brake and  it closed by springs that automatically block the discs when the motor is off. The opening and closing of the brake are determined by the starting and stopping of the motor.
3   Planetary reduction gear:
It is placed inside the drum and increases the lifting torque, reducing the drum rotation speed with respect to the motor speed. It  is sized to transmit the torque required to lift the maximum load.
4   Lowering control valve:
it is hydro guided and mounted directly on to the hydraulic motor and  it prevents  the  load  from suddenly falling down; that’s why it is considered a fundamental safety device.
5   Drum and support structures:
the drum is obtained from a steel or casting; the support  structures  are  bolted  or  made  of  welded  steel making them particularly compact.