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Apr 18, 2024
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2021-2022 College Catalog [ARCHIVED CATALOG]
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AIT 115 - Hydraulic Systems 3 Credits, 5 Contact Hours 2 lecture periods 3 lab periods
Overview of the NIMS areas of hydraulic systems of a manufacturing facility. Preparation to sit for the NIMS Duty Area 3: Basic Hydraulic Systems Certification Exam.
Course Learning Outcomes
- Read and interpret basic fluid power schematics including identifying schematic symbols, process flow, and operation of the components and systems.
- Start up and shut down a hydraulic system, and adjust hydraulic pressure control valves in a system that uses a fixed displacement pump.
- Select and adjust hydraulic actuator speed using a flow control valve.
- Inspect and change a hydraulic filter; and inspect, add, change hydraulic fluid.
- Connect, adjust, and disconnect flexible and rigid hydraulic conductors.
- Install, test, and troubleshoot the operation of components in a basic hydraulic linear or rotary actuator given a schematic.
Performance Objectives:
- Employ mechanical fabrication procedures.
Outline:
- Basic Fluid Power Schematics (e.g. Identifying Schematic Symbols, Process Flow, Operation of the Components/Systems)
- Basic hydraulic components (given NFPA/ISO schematic symbol)
- Operation of circuits using:
- Single stage hydraulic direction control valves with manual and electrical operators
- Two stage hydraulic direction control valves with manual and electrical operators
- Various types of: spool centers, 2-position/3-position and 2/3/4 way designs
- Operation of hydraulic circuits (e.g. using accumulators, pump uploading, remote pressure control, rapid traverse slow feed, pilot-operated check valves)
- Interpretation of hydraulic line types on a schematic
- Operation of a basic hydraulic circuit (given a schematic)
- Basic pneumatic components (given their NFPA/ISO schematic symbol) identification
- Pneumatic line types on a schematic
- Operation of a basic pneumatic circuit given a schematic
- Start Up/Shut Down a Hydraulic System; Adjust Hydraulic Pressure Control Valves in a System that Uses a Fixed Displacement Pump
- Start up a hydraulic power system safely (including pre-start inspection)
- Shut down a hydraulic power system safely
- Manufacturer’s documentation per specific application to determine correct operating pressure
- Reading a pressure gauge
- Adjusting system operating pressure using a relief valve
- Manual valves operation (to direct system flow)
- Adjusting pressure of a pressure reducing valve
- Adjusting system operating pressure
- Pressure-flow characteristics of types of:
- Relief valves
- Direct and pilot operated
- Operation of:
- Double acting cylinder
- Motor
- Hydraulic sequence valve
- Pressure reducing valve
- Pressure-flow characteristics of displacement pumps:
- Fixed
- Variable
- How to do pressure checks and charge accumulators
- Pressure vs. force/torque output characteristics of cylinders and motors
- Pascal’s law, its importance in reading system pressure
- Selecting/Adjusting Hydraulic Actuator Speed (Using a Flow Control Valve)
- Actuator speed adjustment using:
- Needle valve
- Non-compensated flow control valves
- Compensated flow control valves
- Flow control valves adjustment in meter-in and meter-out configurations
- Measuring actuator speed
- Operation of:
- Needle valve
- Flow control valve
- Compensated flow control valve
- Meter-in circuits
- Meter-out circuits
- Flow vs. speed characteristics of a hydraulic cylinder and a motor
- Calculating pump flow rate requirements (given actuator speeds and sizes)
- Calculating pump flow rate (given pump size and speed)
- Inspecting/Changing a Hydraulic Filter to Maximize Hydraulic Fluid Cleanliness
- Interpreting filter specifications/models to determine correct filter
- Manufacturer’s documentation to determine frequency of change
- When to replace a filter based on pressure differential across the filter
- Measuring pressure differential across a filter
- Replacing:
- Spin-on filter
- Cartridge filter
- Symptoms of a required strainer
- Replacing strainer
- Inspecting, Adding, and Changing a Hydraulic Fluid
- Inspecting fluid levels through level gauge; determining when to add fluid
- Adding fluid to a hydraulic system
- Replacing hydraulic fluid using a filter cart
- Fluid inspection through sight, touch, and smell to determine if it should be replaced
- Fluid inspection for water and visible contaminants
- Water and contaminants removal from a hydraulic system (including, but not limited to, flushing and refilling system)
- Interpreting oil specifications (i.e. to determine if an oil meets the specifications specified by the machine manufacturer)
- Manufacturer’s documentation to determine the correct oil to use in a hydraulic system
- Taking fluid sample, preparing for submittal to a testing lab
- Connecting, Adjusting, and Disconnecting Flexible and Rigid Hydraulic Conductors
- Interpreting pipe, hose, and tubing specifications
- Identification of type and size of hose, tubing, and hydraulic fittings (given a sample)
- Safety procedures to make sure pressure is removed before disconnecting conductors
- Proper fitting tightening; consequences of over-tightening
- How to attach/tighten:
- Hydraulic steel tubing, using wrenches and ferrule fittings
- Hydraulic fittings to components with threaded ports, using wrenches and applicable thread sealant
- Hydraulic hose, using wrenches and swivel fittings
- Hydraulic hose, using wrenches and straight thread O-ring fittings
- Adjusting the position and alignment of conductors for proper operation
- How to make hydraulic hose using proper fittings
- O-ring
- Operation
- Installation
- How specified
- Installing, Testing the Operation of Components in a Basic Hydraulic Linear or Rotary Actuator (Given a Schematic)
- Installing/connecting hydraulic components in basic functional circuit (given a schematic)
- Replacing subplate-mounted directional, flow, and pressure control valves in a hydraulic system
- Replacing a threaded port valve
- Mounting/aligning a hydraulic cylinder or a motor
- Types of cylinder and motor mounting methods, and their applications
- Operating a hydraulic system to determine that it is performing correctly
- Proper bleeding procedures of a hydraulic system following component replacement
- Troubleshooting a Basic Hydraulic Linear or Rotary Actuator Circuit
- Basic components in a hydraulic circuit using in-circuit tests troubleshooting
- Using flow and pressure instruments to take hydraulic circuit readings during in-circuit testing
- Flow vs. pressure drop characteristics of components and conductors and their impact on system operation
- Systematic methodologies to troubleshoot basic hydraulic circuits with linear and rotary actuators
- Types of failure of basic hydraulic components
Effective Term: Full Academic Year 2020/21
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