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In a Hydraulic Repair Near Me hydraulic system, the fluid power acts as the power source, much like muscles, to perform tasks. Meanwhile, the control component serves as the brain, directing the system’s operations. The control of a hydraulic system varies from basic start-stop functions to managing the movement of multiple cylinders in a fully automated industrial setting.

There are two ways to control a Hydraulic Repair Near Me hydraulic system:

  • Manual control: Here, an operator sequences and directs the system’s operations, deciding on each action.

Automatic control: In this case, a controller sequences and directs operations, making decisions on each action. Automatic control can be achieved through:

  1. Electrical signals (electrical control),
  2. Compressed air (pneumatic control),
  • c. Mechanical links (mechanical control).

Manual control suits operations that don’t need frequent repetition. An example is an earth-moving truck used in construction, farming, and mining, where the operator continually adjusts the shovel’s position and digging depth. Automatic control isn’t feasible here due to the non-repetitive nature of the tasks.

Conversely, in Hydraulic Repair Near Me systems where operations need to be repeated, manual control can be inefficient, especially when hydraulic valves must be shifted each time to alter the oil flow’s direction. For instance, the figure depicts both manual and automatic (electrical) control of a hydraulic drilling system, illustrating the efficiency of automatic control in repetitive tasks.


Introduction to Electrical Control of Hydraulic Repair Near Me Hydraulic Systems


The operator manually positions the item to be drilled onto the drill machine. The directional control valve is then manually operated to extend the drilling cylinder. Once drilling is completed, the valve is moved in the reverse direction to retract the cylinder. The operator then removes the drilled item and places a new one for drilling. The operator must initiate each step of this process after visually confirming that the previous step is finished.

In contrast, the operator’s role is simply to initiate the system by pressing the START button. This action triggers the controller to engage the solenoid in directional valve 1, extending the feed cylinder to position the item under the drill. The extension of the feed cylinder triggers the photoelectric switch PE1, signaling the controller that the item is in position. The controller then deactivates the solenoid in valve 1 to retract the feed cylinder. When retracted, it activates switch PE2, signaling the controller to engage the solenoid in directional valve 2, extending the drilling cylinder. As the drilling cylinder extends to drill the item, it activates switch PE3, prompting the controller to retract the drilling cylinder by deactivating the solenoid in valve 2. The retraction activates switch PE4, signaling the controller to start a new cycle by engaging the solenoid in valve 1. This automated sequence continues until manually stopped or if a malfunction arises.

This illustrates how electrical control adds flexibility, improved performance, and safety to systems involving multiple interconnected operations.


This section introduces the process of initiating operations in a Hydraulic Repair Near Me hydraulic system. Key components include input elements like limit switches, pushbutton switches, and relay contacts. These elements generate an ‘input signal’ which is directed to a controller’s input.

The controller, which could be a set of electromechanical relays, a programmable logic controller (PLC), or a computer, makes decisions based on the input signals. The output from the controller, known as the ‘control signal,’ is pivotal in directing the movement of a hydraulic actuator via an actuating mechanism.

The Hydraulic Repair Near Me actuating mechanism is vital in directing oil flow to the hydraulic actuator in response to the control signal from the controller. Examples include hydraulic solenoid-operated valves and electro-hydraulic servo valves.

Indicating devices, such as pilot lamps and meters, are not part of the control circuit as they don’t influence the control process.

Electrical control is highly adaptable, allowing changes in the operation of a Hydraulic Repair Near Me hydraulic system simply by adjusting the controller’s logic, rather than altering the hydraulic circuitry. However, in high-pressure applications, electrical control can become intricate and expensive, especially when the actuating mechanisms (like solenoid-operated hydraulic valves) need pilot operation.

This course will guide you in using electromechanical relay control to operate the Lab-Volt Hydraulics Trainer. In this control type, the controller comprises a series of relay contacts that create the necessary logic to sequence the actuators’ movements.

Electricity, a type of energy, is essential for lighting, heating, controlling, and powering machines. It is generated when tiny particles known as electrons move through a conductor. Conductors include materials like iron, copper, and aluminum.

Electrical components, such as wires, lamps, and solenoids, are made from conductive materials, allowing electron flow. For electrons to flow, an electrical component needs to be linked to an electromotive force source, like a generator or a battery. For instance, a battery can propel electrons through wires to activate a solenoid, creating a magnetic field around it.

The force exerted by the source to move electrons is termed voltage, measured in volts (V). A voltmeter is the tool used for measuring voltage.

Resistance is the term for the natural opposition encountered by electrons moving through an electrical component, measured in ohms (Ω). An ohmmeter measures this resistance.

The movement of electrons through a component is known as electric current, measured in amperes (A). An ampere represents the movement of 6.24 x 10^18 electrons across a section in one second, and an ammeter is used to measure this current.

Ohm’s law states that the current passing through an electrical component equals the voltage drop across it divided by its resistance. For instance, if a solenoid has a 20 V voltage drop and a 10 Ω resistance, the current through it is 2 A. Ohm’s law can also be used to calculate voltage drop, resistance, or current when two of these variables are known.

Electrical power, the ability of a source to move electrons in a circuit, is measured in watts (W). The power generated by a source equals the voltage it provides multiplied by the current in the circuit.