Preventive maintenance aims to prevent equipment failures through planned maintenance actions like inspection, lubrication, cleaning, and replacement of parts. Benefits include avoiding production disruptions, maintaining quality, and increasing asset lifespan. A preventive maintenance program involves inspecting, lubricating, replacing, cleaning, adjusting, and testing equipment on schedules tailored to each machine. Predictive maintenance uses condition monitoring to determine when preventive actions are needed, while preventive maintenance tasks are done on set schedules whether the equipment shows signs of failure or not.

1. Preventive Maintenance
Done By: G. Tulloch

2. Objectives
• Define Preventive Maintenance (PM)
• List some Benefits of Preventive Maintenance
• List and explain six functions of PM
programme
• Describe the elements of PM programme
• Distinguish between preventive and predictive
maintenance
• Prepare a PM schedule

3. Preventive Maintenance
• What is Preventive Maintenance?
• Preventive maintenance is a schedule of
planned maintenance actions aimed at the
prevention of breakdowns and failures

4. Goal of PM
• The primary goal of preventive maintenance is
to prevent the failure of equipment before it
actually occurs.

5. Benefits of PM
 avoid production or service disruptions
 maintain high quality goods
 avoid missed delivery dates
increased life expectancy of assets
Timely, routine repairs circumvent fewer large-
scale repairs.
Improved safety and quality conditions.

6. Advantages of a PM system
• Reduced production downtime, resulting in
fewer machine breakdowns.
• Better conservation of assets and increased
life expectancy of assets, thereby eliminating
premature replacement of machinery and
equipment.
• Timely, routine repairs circumvent fewer
large-scale repairs.

7. Continue
• Reduced cost of repairs by reducing secondary
failures. When parts fail in service, they
usually damage other parts.
• Better quality products
• Identification of equipment with excessive
maintenance costs
• Improved safety and quality conditions.

8. Function of PM
Inspecting
Lubricating
Replacing
Cleaning
Adjusting
testing

9. Elements of PM Programme
• Predictive
• Preventive
• Corrective

10. Preventive V.S Predictive
• Predictive- An attempt to determine when
best to perform preventive maintenance
activities
• Preventive- things done in order to prevent
breakdowns.
• Corrective- the process of fixing or repair after
the equipment fail

11. Preventive V.S Predictive
• The difference between Preventive and
Predictive Maintenance is that Preventive
Maintenance tasks are completed when the
machines are shut down and Predictive
Maintenance activities are carried out as the
machines are running in their normal
production modes.

12. Reactive vs Proactive
Reactive Maintenance:
• Breakdown maintenance
–Reactive approach; dealing with breakdowns
or problems when they occur
Proactive Maintenance:
• Preventive maintenance
–Proactive approach; reducing breakdowns
through a program of lubrication,
adjustment, cleaning, inspection, and
replacement of worn parts

13. Prepare a PM schedule
Maintenance Schedule
Machines Daily Weekly Monthly Annually
Lathe
Drill Press
Milling
Machine
Power saw
Grinding
machine