Hydraulic Systems (Design, Operation and Maintenance)

Course Outlines

OBJECTIVES

Course Objectives

After completion of the course, participants are expected to:

• Gain an understanding of basic hydraulics.
• Learn about how hydraulics work - hydraulic training on how common hydraulic components operate and interact with each other.
• Learn more about reading and understanding hydraulic schematics.
• Review preventative maintenance procedures.
• Discuss troubleshooting of hydraulic systems

Course outline 

Introduction to hydraulics

• What is Hydraulics?
• Where hydraulics are used?
• Why use hydraulics?

Pressure and flow

• Pressure concept
• A discussion of hydraulic fluids.
• Selecting a pump
• Fluid viscosity

Hydraulic pumps

• Operating principles of variable displacement pumps 
• Principles of variable displacement pump controls
• Pilot operated pressure compensators
• Constant horsepower controls 
• Load sensing controls 

Hydraulic cylinders

• Construction and operating principles 
• Maintenance and troubleshooting 
• Common causes of cylinder failures 

 Accumulators: their applications and uses

• Piston and bag types 
• Pre-charge calculations and limits 
• Application and design 

Pressure Control Valves and their Characteristics 

• Establishing a pressure setting sequence 
• Main system relief valves 
• Port vs.
  cross port relief valves 
• Pressure reducing valves 
• Direct vs.
  pilot operated valves 
• Vending pilot operated valves 
• Remote and multiple pressure setting 
• Field converting pilot and drain line connections 

Directional Control Valves 

• Basic operation, characteristics and control 
• The importance of selecting the proper spool type 
• Maintenance and repair of stuck spools and burned out solenoids 
• Piloting consideration for pilot operated valves 

Check Valves 

• Pilot operated check valves 
• Pre-fill valves, operating principles 
• Logic cartridge systems, introduction, maintenance 
• Operations, repair, set-up and precautions

Building and analyzing hydraulic circuits 

• Circuit design considerations 
• Designing a Hydraulic Circuit, to give optimum utility - Practical exercises included 

Maintenance and troubleshooting

• Troubleshooting with Hydraulic Circuit Drawings
• Hydraulic Leakage
• Pump and Motor Troubleshooting
• Accumulator Safety Considerations