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Axle Alignment

Axle Alignment. Steering Lecture 4. Reasons for Axle Alignment. Tire wear Installation of auxiliary equipment Prevention of oversteer. Cab-To-Axle. Measured from the back of the cab to the center of the rear axle

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Axle Alignment

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  1. Axle Alignment Steering Lecture 4

  2. Reasons for Axle Alignment • Tire wear • Installation of auxiliary equipment • Prevention of oversteer

  3. Cab-To-Axle • Measured from the back of the cab to the center of the rear axle • Used to determine the correct length of any special equipment installed (i.e. dump beds, flatbeds, utility bodies) • Measured with a tape measure

  4. Wheelbase • Used to check axle alignment • Measure from the center of the front axle to the center of the rear axle • Compare both sides, should be within 1/8” • On a three axle truck, measure to the half way point between the two rear axles

  5. Thrust Lines • Axles push the truck perpendicular to the center of the rear axle • Called a thrust line • Thrust line should be parallel to the frame

  6. Thrust Line Problems • When the rear axle does not follow the front axle, this is called dog tracking • The thrust line will cause oversteer and tire wear

  7. Frame Diamond • One part of the frame can shift ahead or back, resulting in diamond misalignment • Wheelbase measurements will be the same, but it will dog track

  8. Measuring for Diamond • Start with a known point, such as the end of the frame • Measure to the front axle • Should be within ¼”

  9. Tire Alignment • Make sure to drive straight 10-15 feet ahead and back to equalize suspension • Measure from the inside of tire to frame, compare with the other side • Should be within ¼” • Worn suspension parts can be the cause for out of align conditions

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