What is the definition of "maintenance personnel"?
The people responsible for performing basic support and repair of machines.

Learn more about maintenance personnel in the class Preventive Maintenance for Fluid Systems 140 below.


Hydraulics and Pneumatics Training


Class Information
Hydraulics and Pneumatics Training Tooling U-SME classes are offered at the beginner, intermediate, and advanced levels. The typical class consists of 12 to 25 lessons and will take approximately one hour to complete.
Class Name:Preventive Maintenance for Fluid Systems 140
Description:This class provides an introduction to preventive maintenance for hydraulic and pneumatic fluid systems.
Prerequisites: none
Difficulty:Beginner
Number of Lessons:20
Language:English, Spanish
 
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Class Outline
  • Objectives
  • Benefits of Preventive Maintenance
  • Preventive Maintenance Tasks
  • Who's Responsible for Preventive Maintenance?
  • Fluid System Problems: Common Causes
  • What Is Contamination?
  • How Does Contamination Occur?
  • Internal Contamination
  • Filters and Strainers
  • Oil Selection
  • Inadequate Oil Supply
  • Leakage
  • Seal Selection
  • Seal Maintenance
  • Heat Build-Up
  • Monitoring Pressure
  • Checking System Operation
  • Pneumatic System Maintenance
  • Recordkeeping
  • Summary
  
Class Objectives
  • Define preventive maintenance.
  • Describe preventive maintenance tasks.
  • Describe the persons responsible for preventive maintenance.
  • List common causes of fluid system problems.
  • Describe contamination.
  • Describe contamination.
  • Describe internal contamination.
  • Describe strainers and filters.
  • Describe strainers and filters.
  • Describe how to check oil levels.
  • Describe how to check oil levels.
  • Describe external leaks.
  • Describe O-ring seals.
  • Describe the effects of operating conditions on seals.
  • Describe heat exchangers.
  • Describe devices for monitoring pressure.
  • Describe system operation checks.
  • Distinguish between hydraulic and pneumatic system maintenance.
  • Describe the main purpose of recordkeeping.

Class Vocabulary

Vocabulary TermDefinition
absorbent filter A filter used for trapping very fine and fine particulate matter. Absorbent filters consist of paper and resin.
adsorbent filter A filter used for trapping various sizes of particulate matter. Adsorbent filters consist of clay and chemically treated paper.
air compressor A component that pressurizes ambient air and directs it into a pneumatic system.
air-cooled heat exchanger A component in a hydraulic system that relieves excessive heat with cool air. Heat is transferred from the hydraulic fluid to the air.
Bourdon tube gage An instrument used for checking pressure levels in hydraulic systems.
cavitation An unwanted condition that occurs in hydraulic pumps due to excess air in the pump. Cavitation occurs when the suction is greater than the pressure levels, which causes air bubbles to collapse at the outlet.
clean-out plate A removable plate located at both ends of the reservoir. Clean-out plates are easily removed to allow access to the inside of the reservoir.
clearance The space between components that allows movement and lubrication.
cocking The improper, angled seating of a seal.
conductor The components such as pipes, tubes, and hoses that convey liquids throughout a hydraulic system.
contaminant Any foreign substance that may cause a loss of efficiency or a breakdown in a fluid system.
contamination The presence of any unwanted substances in a fluid system. Contamination is the primary cause of problems in fluid systems.
downtime Unproductive blocks of time during which machine operations cease, often due to mechanical problems.
dynamic seal A seal designed to allow movement of component parts. Dynamic seals wear faster than static seals.
efficiency The amount of power output by a fluid power system compared to the amount of power input.
external leakage The unintentional movement of fluid from a system into the environment.
filter A screen used for trapping very fine and fine particulate matter.
filter media Layers of various materials used in a filter to trap particulate matter. Filters are referrred to as single-media or multi-media, depending on the number of layers they possess.
flowmeter An instrument used for checking fluid flow in hydraulic systems.
fluid system designer The person responsible for choosing compatible parts and assembling a fluid system.
heat exchanger A component that helps relieve the excessive heat that builds up in a hydraulic system.
heater A component in a hydraulic system that maintains the oil at a set temperature so it does not burn. The heater is located in the reservoir near the pump inlet and is controlled with a thermostat.
hydraulic system A power transmission system that uses the force of flowing liquids to transmit power.
internal leakage The unintentional movement of fluid from one component to another within the system.
maintenance The necessary and basic support and repair of machines. Maintenance includes tasks such as lubricating, adjusting, and replacement of parts.
maintenance personnel The people responsible for performing basic support and repair of machines.
mechanical filter A strainer used for trapping coarse particulate matter. Mechanical filters use a metal cloth or screen to trap contaminants.
nonpositive seal A seal that allows a small, intentional amount of fluid to pass.
operator A person trained to run a specific type of machine on a daily basis.
o-ring seal A rubber ring that forms a seal under pressure. O-rings are capable of both static and dynamic seals and are capable of containing very high pressures.
particulate matter Solid contaminants. Particulate matter includes metal, dirt, sand, and dust.
petroleum-based oil A hydraulic fluid developed from petroleum. Petroleum-based oils are the most common hydraulic fluids.
pneumatic system A power transmission system that uses the force of flowing gases to transmit power.
positive seal A seal that does not allow any amount of fluid to pass.
power The rate of doing work in a specified period of time.
preventive maintenance Maintenance performed while a machine is in working order to keep it from breaking down.
reactive maintenance Maintenance performed only after a machine fails or experiences problems.
relief valve A non-adjustable control valve that regulates pressure in a hydraulic system.
Saybolt Universal Second The unit of measurement for oil viscosity in the United States. Saybolt Universal Second is abbreviated as SUS or SSU.
sight glass Holes that allow you to see inside of the reservoir. Sight glass holes are located in the clean-out plates on both ends of the reservoir.
sludge A form of contamination. Sludge is liquid matter that forms in the reservoir.
static seal A seal designed to allow no movement.
strainer A screen used for trapping large and coarse particulate matter.
synthetic oil A hydraulic fluid that contains no petroleum. Synthetic oils are ideal for hydraulic systems that are used near a fire hazard.
viscosity A fluid's resistance to flow. Viscosity is used to describe friction of fluid.
water-cooled heat exchanger A component in a hydraulic system that relieves excessive heat with cold water. Heat is transferred from the hydraulic fluid to the water.
watt density The amount of energy emanating from each square inch of a heater.