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HYDRAULIC SYSTEMS and APPLY DEVICES

HYDRAULIC SYSTEMS and APPLY DEVICES. Chapter 5 Page 93 Classroom Manual. LAWS of HYDRAULICS. All hydraulic systems have a liquid, pump, lines, control valves, and a output device. Hydraulics is the study of liquids in motion. Liquids will conform to the shape of their container.

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HYDRAULIC SYSTEMS and APPLY DEVICES

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  1. HYDRAULIC SYSTEMS and APPLY DEVICES • Chapter 5 • Page 93 • Classroom Manual

  2. LAWS of HYDRAULICS • All hydraulic systems have a liquid, pump, lines, control valves, and a output device. • Hydraulics is the study of liquids in motion. • Liquids will conform to the shape of their container. • Liquids will react predictably to pressure exerted on them. Page 94

  3. PASCAL’S LAW • Pressure is equal in all areas of a sealed hydraulic system. • Hydraulics can be used to increase the force available to do work. Page 95

  4. FLUID CHARACTERISTICS • Any leak will decrease pressure. • Liquids have no shape of their own. • Liquids seek a common level. • Liquids are incompressable. Page 96

  5. MECANICAL ADVANATAGE • Hydraulics do work in the same way as a gear or lever. • Force x Distance = Work • Increase force = Reduced distance. • Decrease force = Increased distance.

  6. AUTOMATIC TRANS APPLICATIONS • Fluid is used to apply bands and clutches. • Servos are used to apply bands. • Holding power is determined by band type and pressure applied. • A servo multiplies force through hydraulic action. Page 97

  7. FLUID • All hydraulic systems use a fluid to perform work. • All domestic manufactures require a petroleum-based fluid. • Some import manufactures require the use of a synthetic fluid. • ATF is dyed clear red, and darken when burnt, or become milky when contaminated by water. Page 97

  8. FLUID ADDITIVES • Zinc, phosphorus, and sulfur are commonly added to reduce friction. • Detergent additives, keep the parts clean. • Dispersants keep contaminants suspended so they can be trapped by the filter. • ATF is subjected to many tests, oxidation resistance, corrosion and rust inhibition, flash and flame points, and resistance to foaming. Page 97

  9. FLUID REACTIONS • Chemicals in fluids may react with seals. • Fluids are tested for compatibility with a specific transmission. • Incompatibility can result in swelling or shrinking seals. • ATF is also tested for the ability to mix with other brands.

  10. RECOMMENDED APPLICATIONS • There are several types of ATF. • Fluid types include A, CJ, H, Dextron, and Mercon. • Types F and G do not contain friction modifiers. Page 98

  11. FILTERING • Filters trap dirt and particles. • Untapped particles can cause sticking valves and premature wear. • Deep pans will have a unique filter. • Three types of filter media screen, paper, felt. • Secondary filters for pumps, governors, ect. Page 99

  12. TRANS OIL FILTER Page 99

  13. RESERVOIR • Reservoir is the oil pan. • Oil is drawn from the pan and returned after being circulated through the selected circuits. • Level must be maintained to prevent aeration. • All transmissions must have a vent to allow air movement in and out of the trans. Page 100

  14. OIL PAN

  15. TRANS COOLERS • Keeping the ATF cool ensures that it will be able to adequately lubricate and cool the transmission. • The trans cooler dissipates heat into the air stream flowing though the radiator. • Return oil is lube oil in most trans’s. Page 100

  16. OIL COOLER CIRCUIT Page 100

  17. OIL PUMPS • The oil pump provides circulation and pressure. • Oil pump is driven by hub of the torque converter. • Three types of pumps gear, rotor, vane. • Vane type is variable displacement. Page 101

  18. GEAR PUMP Page 103

  19. ROTOR PUMP Page 103

  20. 400 PUMP

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