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Steering Boxes

Steering Boxes. Steering Lecture 5. Steering Gear Types. There are two types of steering gears: Worm and Roller Recirculating Ball These are found in both manual and power steering systems. Worm and Roller Steering Gear.

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Steering Boxes

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  1. Steering Boxes Steering Lecture 5

  2. Steering Gear Types • There are two types of steering gears: • Worm and Roller • Recirculating Ball • These are found in both manual and power steering systems

  3. Worm and Roller Steering Gear • In this gear, the hourglass shaped worm (white) is rotated by the steering shaft • The roller (red) on the sector shaft (blue) moves with the worm, making the turning effort easier because of less friction • The sector shaft (blue) is connected to the pitman arm (yellow)

  4. Recirculating Ball Type • In this gear, the worm (white) is rotated by the steering shaft • Between the worm and ball nut (blue) are several ball bearings that reduce friction on the worm

  5. Recirculating Ball Type • The ball nut has a gear on it and turns the sector gear (red), which is connected to the pitman arm • The ball bearings ride inside the ball nut and are returned to the front

  6. Steering Box Adjustments 1 • Centering the steering wheel • Raise the truck and turn the steering wheel all the way to the end • Turn the other way and count the turns • Turn it back half way • Measure the distance between the front of the tire and frame against the back of the tire and frame • Should be within 1/8” • To adjust, lengthen or shorten the drag link

  7. Steering Box Adjustments 2 • Worm Bearing Preload • With the drag link and steering shaft disconnected, connect an inch pound torque wrench to the input shaft • Move the input shaft back and forth ¼ turn and note the reading • Compare with manufactures specs • If loose, remove shims or tighten the adjuster • If tight, add shims or loosen adjuster

  8. Steering Box Adjustments 3 • Total Mesh Preload • After checking the worm preload, center the gear and adjust the sector shaft to zero backlash • Take a wrench and rotate from end to end and note any difference in effort required to turn • If it is harder in the middle, back off the sector adjustment slightly

  9. Steering Box Adjustments 4 • Centering the steering box • With the steering box installed, remove the steering shaft and drag link • Rotate the input shaft all the way to the left and mark, then rotate all the way to the right and mark • Find the half way point and mark • Turn back ½ the amount of turns • The drag link should connect

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