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Unit 3: Maintenance and Safety Checks

Learn about the function of batteries, how to use jumper cables, the importance of oil, fuel systems, hydraulic systems, and maintenance and safety checks.

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Unit 3: Maintenance and Safety Checks

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  1. Unit 3: Maintenance and Safety Checks

  2. What Does a Battery Work? • Function: • Stores electrical energy inside of cells. • How: • Battery Contains Sulfuric acid/water combination. • When discharged (used), electrolyte solution becomes more diluted. • When charging (either on charger or alternator), electrical energy is converted to chemical energy & sulfuric acid/water solution becomes more concentrated.

  3. Using Jumper Cables… • First Connect the Positive post of the (good) booster battery, then the Positive post of the dead battery. Good Battery Dead Battery From http://www.cyb.co.nz/automotive/batt_facts/jumpstart.htm

  4. Using Jumper Cables Continued • Next connect the negative post of the booster battery, then connect the cable to a good ground away from the battery on the dead machine. Good Battery Dead Battery From http://www.cyb.co.nz/automotive/batt_facts/jumpstart.htm

  5. How important is Oil? • Extremely Important! • 4 Main Functions of Oil: • Reduces friction of moving parts • Carries heat away from engine. • Creates seal between piston and cylinder wall. • Keeps engine clean.

  6. Oil Viscosity: The viscosity grade (for example, SAE 30 or a Multigrade oil like 5W-30) tells you the oil's thickness, or viscosity. A thin oil has a lower number and flows more easily, while thick oils have a higher number and are more resistant to flow. Water has a very low viscosity -- it is thin and flows easily. Honey has a very high viscosity -- it is thick and gooey.

  7. Most oils on the shelves today are "Multigrades", which simply means that the oil falls into 2 viscosity grades (i.e. 10w-40) • Multigrades were first developed some 50 years ago to avoid the old routine of using a thinner oil in winter and a thicker oil in summer. • In a 10w-40 for example the 10w (W = winter, simply means that the oil must have a certain maximum viscosity/flow at low temperature. • The lower the "W" number the better the oil's cold temperature/cold start performance.

  8. Gasoline: Fuel Tank  Carburetor  Spark Plugs  Engine Diesel: Fuel Tank  Pump & Injectors  Engine Fuel Systems: http://www.youtube.com/watch?v=JgbuE1FT5Ks http://www.youtube.com/watch?v=IYWUWMmimjQ Both have very small passageways for fuel movement. Important that fuel be kept free of dirt & water.

  9. http://videos.howstuffworks.com/discovery/31562-massive-engines-hydraulic-diggers-video.htmhttp://videos.howstuffworks.com/discovery/31562-massive-engines-hydraulic-diggers-video.htm Hydraulic System • Works through set of hydraulic rams pulling & pushing. • Problems can be attributed to: • 1 Not enough oil in reservoir. • 2). Dirty/clogged filter. • 3). Leaking connections. • 4). Incorrect oil in system. • Milky colored= water in system. • Clean quick couplers before connecting.

  10. Lubricating moving parts • Use correct type of grease & wipe fittings to remove debris before attaching grease gun.

  11. Maintain Clutch-Free Travel • ½” – 2” of clutch movement is normal. • May burn out if not maintained

  12. What is Maintenance? • Proper Prevention Prevents Poor Performance…

  13. In this section, we will discuss: • Daily Maintenance Checks • Preventive Maintenance Schedule • Maintenance Systems and Charts • Maintenance Operation

  14. Daily Maintenance • FOUR REASONS FOR DAILY MAINTENANCE: • Reduces Tractor and Machine Stoppages • Reduces Equipment Safety Hazards • Reduces Operation Cost • Increases Service Life

  15. Preventive Maintenance Schedule • 4 WAYS/TYPES OF HOW A PREVENTATIVE MAINTENANCE SCHEDULE IS KEPT: • Schedule Maintenance By Hours (10, 50, 100, 250, etc) • Seasonal Checks or Yearly Checks • Date and Hours of Machine when Service or Maintenance is Completed. • Any Additional Records (Oil, Fuel, Repair Cost)

  16. Maintenance Systems And Charts Used to find out when suggested maintenance and lubrication should be done.

  17. (Look @ ~pg. 27 for details) Maintenance Operation-(found in operator’s manual)

  18. Tires… • Can add ballast (weight) to improve traction. • Too much weight-no evidence of tread slippage • Too little weight-too much slippage • 10%-15% slippage is ideal.

  19. Types of Ballast Material

  20. The Daily Maintenance Check: • Check: • Fuel Supply • Radiator Coolant Level • Tire Pressure • Battery Fluid Level • Crankcase Oil Level- oil level may decrease over time…

  21. The Safety Check- • When a tractor is serviced, check for safety hazards like loose belts, worn/broken/damaged parts, & dirt accumulation. Also check: • Seat Position and Security • Steering Connections • Hitch • Tires and Wheels • Platform (no loose objects) • Steps and handholds • Brake Pedal locking function works • Attached Equipment • Ignition Wiring

  22. Assignment: • Unit 3: Pg. 37 (1-10) • Optional Enrichment Assignment for Success: Pg. 36 • Maintenance & Safety Checks

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