Agriculture Engineering-chptr 10

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Agriculture Engineering-chptr 10

  1. 1. TRACTOR HYDRAULICS AND 3 POINT LINKAGE
  2. 2. hydraulicadvantage
  3. 3. Operation of a basic hydraulic systemThe hydraulic system provides the “muscle” forcontrolling various operations. Hydraulicfunctions are : a. Steering * b. Brakes * c. Transmission d. Implement control * e. Remote cylinders f. Hydraulic motorsHydraulic fluid serves as power transmitting mediumand also the system’s lubricant and coolant
  4. 4. Hydraulic SteeringHydraulic valve controlled by the steering wheeland hydraulic pistons which assist the steeringmechanism in turning the wheels
  5. 5. Power BrakesMean that hydraulic force completely controlsthe braking of the machine
  6. 6. Implement ControlTwo types used on tractor :1.Power lift (Rockshaft) Used in control mounted implements Is controlled either manually using a control lever or automatically by load sensing2.Remote control Usually placed on a pull type implement to control a function such as raising the plow bottoms
  7. 7. Raising Plow Using Control LeverThe plow hit hard ground and the operator wants to raise itslightly Moves the control lever to the front (1) This pivot the cam follower (2) forward and presses it against rod (3) which opens valve (4) Pressure oil is now admitted to the cylinder, forcing piston (5) to the rear The piston pushes against the shaft arm (6), rotating rockshaft (7) and lift arm (8) upward The lift arm is attached to the plow and so the plow is raised slightly to help it pass through the hard ground
  8. 8. Automatic Draft Control Raises The PlowThe plow hit the hard ground (1) and load control shaft (3)is pulled rearward by draft links (2)As a result, load control arm (12) is pivoted against camfollower (4)The cam follower pushes on the rod (5) which open valve(6) and admits pressure to cylinder (7)The cylinder piston pushes against the arm (8), rotatingrockshaft (9) and lift arm (10) upwardThe lift arm is attached to the plow and so raises the plowslightly to help it pass through the hard groundThe regular depth of the plow can be set at the controllever. The plow will stay at this depth unless a signal isgiven by the load sensing device
  9. 9. THANK YOU

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