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Garnett Cross Advanced Hydraulics Training
Rating: 4.7 out of 5(710 ratings)
3,212 students

Garnett Cross Advanced Hydraulics Training

Training in the design and troubleshooting of hydraulic systems - presented by the late Garnett Cross
Created byGarnett Cross
Last updated 3/2022
English

What you'll learn

  • Design of oil hydraulic systems, enabling the students to understand best practices and troubleshooting hydraulic systems.
  • The Advanced Hydraulic Course is generally directed to Engineers and Technicians, but any person may study
  • Determining the correct method of using Hydraulic Motor catalogues when designing hydrostatic drives.
  • Determining the torque in Nm when given the tonnage to lift a load with a winch, and being able to design the the hydrostatic system

Course content

1 section • 35 lectures • 7h 54m total length

  • Introduction to the Components in Hydraulic Systems15:35

    This lecture is an introduction to the Advanced Hydraulic course and presents an introduction to the SI unit system.

  • Introduction
  • Pressure is Caused by Resistance to Flow7:55

    This lecture will cover the necessity of a decompression system and off design solutions for a decompression system. A decompression system is required if 0,5 litres, or more has been compressed in a cylinder. Demonstrating that pumps supply flow rate and are unable to supply pressure. Oil taking the line of least resistance when extending two cylinders, with different diameters.

  • Pressure in a hydraulic system.
  • Hydraulic Symbols and Decompressing Circuit8:41

    This lecture covers the compressibility of oil and the method designing a decompression system for a cylinder when using manually controlled directional valves.

  • Hydraulic Symbols and Decompression Circuit
  • Decompression Circuit for an Electrically Controlled System6:01

    This lecture presents an example decompression circuit for an electrically controlled system.

  • Compressibility of Oil and Decompression Systems
  • Hydraulic Fluid Handling and Grading of Filters21:28

    This lecture presents recommendations for hydraulic fluid handling and filter grading in relation filterability for hydraulic oil.

  • Handling Hydraulic Oils
  • Flow Path Through a Filter9:02

    This lecture presents how the flow path through a filter is indicated and the importance of pressure line filters and the return line filters in a system.


  • Flow path through a filter
  • Cylinder Design - Hydraulic and Mechanical Leverage19:21
  • Hydraulic Cylinder Design.
  • Determine the Number of Set Screws to Secure the Cylinder Cap End Cover6:14

    This lectures presents the formulas and how to determining the number of set screws to secure the cylinder cap end cover

  • Determine the number of set screws required for a cylinder rod end cap
  • Tolerances in Machining Cylinder Parts13:35

    This lecture presents a method of using and implementing Tolerances in machining Cylinder parts.

  • Tolerances
  • Flow Dividers14:04

    This lecture covers flow dividers and how they can be used so cylinders can move together. Circuitry is presented incorporating a flow divider.

  • Flow Dividers
  • Reservoir and Hydraulic Power Unit Design16:59

    This lecture covers the design of hydraulic reservoirs and hydraulic power units.

  • Reservoir and Hydraulic Power unit Design.
  • Designing a Hydraulic System34:22

    This lecture presents the steps to correctly design a hydraulic system, how to determine flow rates, pipe sizes for intake and pressure lines and power requirements.

  • Designing a Hydraulic System
  • Check Valves and Cartridge Valves8:27

    This lecture covers the operation and use of check valves and cartridge valves.

  • Function of Check Valves and Cartidge Valves
  • Cartridge Valves5:33

    This lecture covers the use of cartridge valves to control a cylinder.

  • Cartridge Valves
  • Pilot Operated Check Valves14:41

    This lecture presents pilot operated check valves. Showing the function and use of a pilot operated check valve in a system as a safety device.

  • Pilot Operating Valves
  • Flow Control Valves9:33

    This lecture covers flow control valves. Various methods of controlling the speed of a cylinders with flow control valves. Bleed-Off Method. Meter-In Method. Meter-Out Method. The meter out method is the best, but there is the possibility of causing pressure intensification in the annulus area, (the area around the piston rod). A person must ensure the cylinder wall thickness can withstand the intensified the pressure if a meter-out method of cylinder speed control is used.

  • Controlling Cylinder Speed
  • Protecting Cylinders from Pressure Intensification4:01

    This lecture presents the challenge of pressure intensification, this can happen when a cylinder supporting a vertical load and oil bypasses the seal. Design proposals are provided on how to protect cylinders from pressure intensification.

  • Protecting a Vertically Mounted Cylinder
  • Directional Control Valves27:26

    This lecture covers the various types of directional control valves: lever operated directional control valve, solenoid controlled valves and pilot operated directional control valves.

  • Directional Control Valves
  • Relief Valves10:32

    This lecture covers relief valves and pilot operated relief valves. Animated drawings show the functions of the relief valves plus venting of the relief valves.

  • Relief Valves
  • Unloading Valves7:43

    This lecture covers the operation of unload valves and how they may be used in hydraulic circuits.

  • Unloading Valves
  • Design of a Fast Approach and a Slow Pressing Speed System39:51

    This lecture covers The complete design of a fast approach and a slow pressing speed using a double pump System and the unloading valve.

  • The Double Pump System
  • Displacement Cylinders and Regenerating Systems.12:46

    This lecture demonstrates a displacement cylinder and the function of a regenerating system.

  • Regenerating System
  • Design of a Regenerating System with a 48-ton Load25:49

    This lecture presents a complete design of a regenerating system with a 48-ton load.

  • Design of Regenerating System
  • Design of a Regenerating System with a 45-ton Load.31:09

    This lecture presents a complete design of a regenerating system with a 45-ton load. This system varies from the previous one as it does not follow the “normal” steps. There is the variation of the area ratio which changes the return flow rate and the flow rate of the “normal sizing” of the directional valve.

  • Design of Regenerating System with 45 ton load.
  • Overcentre Valves10:35

    This lecture covers the use of overcentre valves and their use in a hydraulic systems.

  • Overcentre Valves
  • Use of Hydraulic Motor Catalogue When Designing a Motor System19:50

    This lecture present the method of using the hydraulic motor catalogue when designing hydraulic motor systems. For this exercise, sections from the Hydromatik bent axis piston motor catalogue will be used. The winch load is 200 Nm, 950 rpm, estimated working pressure of 290 bar.


  • Using hydraulic motor catalogue to design hydraulic motor systems
  • Closed Loop Hydrostatic Drive10:34

    This lecture presents the closed loop hydrostatic drive and the important use of inline filters.

  • Closed Loop Hydrostatic Drive
  • Animated Hydraulic Motor Circuits16:16

    This lecture presents animated hydraulic motor circuits.

  • Animated Hydraulic Motor Circuits
  • Determine Hydraulic Motor Parameters6:46

    This lecture presents the method of using a hydraulic motor catalogue when designing hydraulic motor systems. For this exercise, sections from the Hydromatic Bent Axis Piston Motor catalogue will be used.

  • Hydraulic Motor Catalogue Exercise
  • Using Hydromatic Bent Axis Piston Motor Catalogue7:29

    This lecture presents the method of using a hydraulic motor catalogue when designing Hydraulic Motor Systems. For this exercise, sections from the Hydromatic Bent Axis Piston Motor catalogue will be used.

  • Hydraulic Motor Catalogue Exercise
  • Designing Hydraulic Motor Systems8:00

    This lecture presents the method of using hydraulic motor catalogue when designing Hydraulic Motor Systems. For this exercise, sections from the Hydromatic Bent Axis Piston Motor catalogue will be used.

  • Hydraulic Motor Catalogue Exercise
  • Accumulators14:48

    This lecture presents the use of an accumulator to assist the pump for the initial fast approach of a cylinder.

  • Accumulators
  • Accumulators Part 24:26
  • Accumulators Part 2
  • System to Allow Hydraulic Fluid to Circulate from the Cylinder4:05

    This lecture presents a design for a system to allow hydraulic fluid to circulate from the cylinder lines when the directional valve is at such a distance the hydraulic is unable to circulate to the reservoir.


  • Circulation of Hydraulic Oils
  • Conclusion0:52

Requirements

  • Completed the basic Garnett Cross Hydraulics Training course or prior hydraulic training.
  • The Advanced Hydraulic Course Is best if a person has prior knowledge of hydraulics . The Advanced Hydraulic Course does begin with the basic principles of hydraulics.

Description

This course will provide you with the essential resources to design and extend the up-time and life of hydraulic systems. Content draws on years of practical field experience and consulting.

You will be guided through a detailed 20 step approach to design a complete system including cylinder diameter, cylinder wall thickness, rod diameter, pump flow rate, pipe diameters, kW / amperage to drive the system and decompression requirements.

In addition to overall system design, you will be instructed in how to solve challenging problems in hydraulic systems.

Detailed animations are provided to help understand the flow of oil and operations of the various components and systems.

Materials covered:
- Various types valves and their use within a hydraulic system. (Cartridge valves, Check Valves, Pilot Operated Check Valves, Unload Valves, Flow Control Valves, Over Center Valves, Relief Valves, Directional Control Valves).
- Oil Filtration, design and selection of hydraulic filters.
- Often overlooked critical factors of a hydraulic system.
- Design of hydraulic cylinders, cylinder tolerances and cushioning.
- Reservoir Design.
- Oil Compression and de-compression circuits.
- Pressure Intensification within a hydraulic system and how to protect a system.
- Systems:
  - Operating cylinders in parallel and series.
  - Circulating oil.
  - Double pump system.
  - Regenerating system.
  - Fast Approach, slow press system.
  - Hydrostatic drives, closed and open loop systems including motor selection.

You will be provided the necessary formulae with detailed examples to determine:
- Pressure required to move a cylinder for a given load.
- Cylinder selection, rod diameter and cylinder wall thickness.
- Flow rates.
- Number cap screws required for cylinder cap end.
- Required pump flow rate and return line flow rate.
- Power requirements to drive the pump.
- Hydraulic hose selection, suction line diameter, pressure line diameter, return line diameter.
- Pressure intensification.
- Filter sizing - pressure and return line.
- Valve sizing.
- Compression of oil and requirements for a decompression system.
- Reservoir sizing.
- Accumulator selection.
- Hydrostatic drive motor selection.

Note: Although the principles taught in this course are generally applicable, the material and calculations are demonstrated for a given set of parameters, the materials used for cylinder manufacture, oil viscosity or composition and local conditions must all be factored in to the calculations when designing a system. A professional mechanical engineer must review designs due to potential danger to lives and property.

Who this course is for:

  • Experienced oil hydraulics technicians or engineers

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