Name: General Electric A20B-0002-0942
Availability: InStock

Description

General Electric A20B-0002-0942

When the control handle is in the middle position, the diagonal variable displacement pumps 11H and 1112 operate in the middle position, and the motor control valves 1141-1 (in the right position) bypass the oil cylinder. The oil motor is braked by the normally closed brake, and the lifting system does not work. If the control lever is pushed to the right, the lifting system will be in a heavy load and low speed condition. At this point, the solenoid coil b of control valve 1221 is energized, and its port B supplies oil. Motor control valves 1141-1 switch from the unloading state shown in the diagram to the middle position, and the oil motor operates at full displacement (low speed, high torque). If the control lever is pushed to the left, the lifting system is in an unloaded high-speed condition. At this point, the solenoid coil a of control valve 1221 is energized, causing oil supply to ports A and B simultaneously. As a result, motor control valves 1141-1 are pushed to the leftmost position, and the oil motor operates at only half the displacement, doubling the motor’s operating speed. In theory, the lifting capacity is reduced to half of the original maximum lifting capacity (in reality, due to the influence of friction, it is only about 40% of the original). If the weight of the lifted cargo is already overloaded for high-speed gear operation

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