The lifting mechanism is the main implementation mechanism of crane, winch is driven by one or two large torque hydraulic motor.( ferris wheel bearing ) Motor forward and reverse control by a manual three position four way reversing valve.
The rotational( rotary bearing ) speed of the motor, namely the lifting speed can be adjusted by changing the speed of the engine. In the back of the oil motor decline on the road with the balance valve,ship loader bearing used to prevent the free falling weight.
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