Hydraulics - Part 09169SL - Toro University Technical Training - Hydraulic Circuits and Components

Oct 28, 2026

Hydraulic Circuits and Components is a technical study guide that introduces fundamental principles of basic hydraulic systems and explains how simple or complex circuits apply them. It covers Pascal’s law and hydraulic leverage, then breaks down the four core components: reservoir, pump, valves, and actuator. The guide explains how fluid moves through typical circuit operation, why pump displacement affects cylinder speed, and how oil flow and pressure govern lifting performance.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages44

Reading Time1 h 51 min

AccessFree to download

Circuits and Components

Schematics

Hydrostatic Transmissions

Hydraulics Hoses and Fittings

Hydraulic Testing

Testing Examples

Pascal’s Law

Hydraulic “Leverage”

Basic Hydraulic System

Reservoir

Pump

Control Valve

Hydraulics Circuits, Components, Schematics, Hydrostatic Drives and Test Equipment PART NO. 09169SL This page is intentionally blank. Table of Contents Circuits and Components ................................................................................................ 2 Schematics .................................................................................................................... 11 Hydrostatic Transmissions............................................................................................. 18 Hydraulics Hoses and Fittings ....................................................................................... 25 Hydraulic Testing........................................................................................................... 28 Testing Examples .......................................................................................................... 36 Toro University Technical Training Hydraulic Circuits and Components This study guide will discuss basic hydraulic systems. We will look at fundamental principles and how they pertain to hydraulic systems. We will also learn about various hydraulic components and their function. A hydraulic circuit, whether it is simple or complex uses the basic hydraulic principles discussed on the following pages. A liquid can assume any shape and be bidirectional. Fluid is able to flow in any and all directions within a container. Pascal’s Law Pascal’s law states that when a confined fluid is placed under pressure, the pressure is transmitted equally in all directions and on all faces of the container. This is the principle used to extend the ram on a hydraulic cylinder. By applying a force to move the piston on one end, the piston on the other end will move the same distance with same amount of force. Toro University Technical Training Hydraulic “Leverage” If we take the concept discussed on the previous slide and use containers or cylinders of different sizes, we can increase the mechanical advantage to lift a heavier load. This is the principle that allows you to jack up a very heavy object while exerting a small amount of force on the handle of a hydraulic jack. The animated illustration shows that 1 lb. of force exerted [on a 1 sq. in. piston](on a 1 sq. in. piston), moved 10 in. will lift 10 lbs. a distance of 1 in. with a 10 sq. in. piston. Click on the 'Play' button in the illustration to see a demonstration. The larger piston will move a shorter distance, but provides the mechanical advantage to lift a much heavier load. The mechanical workforce advantage in hydraulicscan be thought of as leverage, but it is hydraulic leverage. All hydraulic circuits are essentially the same regardless of the application. There are four basic components required; a reservoir to hold the fluid; a pump to force the fluid through the system; valves to control the flow; and an actuator to convert the fluid energy into mechanical force to do the work. Basic Hydraulic System Although hydraulic circuit layouts may vary significantly in different applications, many of the components are similar in design or function. The principle behind most hydraulic systems is similar to that of the basic hydraulic jack. Oil from the reservoir is drawn past a check ball into the piston type pump during the piston's up-stroke. When the piston in the pump is pushed downward, oil will be directed past a second check ball into the cylinder. As the pump is actuated up and down, the incoming oil will cause the cylinder ram to extend. The lift cylinder will hold its extended position because the check ball is being seated by the pressure against it from the load side of the cylinder. Because the pump displacement is usually much smaller than the cylinder, each stroke of the pump will move the cylinder a very small amount. If the cylinder is required to move at a faster rate, the surface area of the pump piston must be increased a

FAQs

What does Pascal’s law explain in a hydraulic system?

Pascal’s law states that pressure applied to a confined fluid transmits equally in all directions and to all faces of the container. This principle is used to extend the ram in a hydraulic cylinder and to ensure matching movement and force behavior across pistons.

How does hydraulic leverage increase the ability to lift heavier loads?

Using containers or cylinders of different sizes increases mechanical advantage. A larger piston moves a shorter distance while providing the leverage needed to lift a much heavier load with a smaller applied force.

What are the four basic components required for a hydraulic circuit?

A hydraulic circuit needs a reservoir to hold the fluid, a pump to move the fluid through the system, valves to control flow, and an actuator to convert fluid energy into mechanical force to perform work.

Oct 28, 2026

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