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What is the definition of maintenance?

The necessary and basic support and repair of machines. Maintenance includes tasks such as lubricating, adjusting, and replacement of parts.
Learn more about maintenance in the class "Preventive Maintenance for Fluid Systems 140" below.

Preventive Maintenance for Fluid Systems 140

Hydraulics and Pneumatics Training

Class Information

ToolingU.com 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

Below are all the competencies and job programs that contain the class Preventive Maintenance for Fluid Systems 140. Job programs are our traditional class lists organized according to common job functions. Competencies are our latest job-specific curricula that help tie online learning to practical, hands-on tasks.

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Competencies
Maintenance Machinist Maintenance Mechanic

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
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.