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Gears and Shafts

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    Fig 1: Inspecting Ring Gear
    GM1400846Courtesy of GENERAL MOTORS CORP.
  1. Clean the gears and shafts in solvent.
  2. The ring gear and pinion must be inspected for proper wear and pattern.
    • The end of the gear tooth farthest away from center of ring gear (1) is the heel end of the tooth.
    • The end of the gear tooth nearest center of ring gear (2) is the toe end of the tooth.
    • The side of the tooth that curves inward or is concave (3) is considered the coast side of the tooth.
    • The side of the tooth that curves outward or is convex (4) is considered the drive side of the tooth.
    3. Fig 2: View Of Drive & Drivenshafts
    GM630613Courtesy of GENERAL MOTORS CORP.
  3. Inspect the pinion shaft for the following conditions:
    • Wear, pitting, or discoloration by heat on the gear teeth (1)
    • Worn or scored shaft (2)
    • Worn or damaged splines (3)
    • Damaged threads (4)
    • Worn bearings (5)
    4. Fig 3: Inspecting Pinion Flange For Wear, Damaged Bolt Threads & Worn Or Damaged Splines
    GM737728Courtesy of GENERAL MOTORS CORP.
  4. Inspect the pinion flange seating surface (2) for wear, damaged bolt threads (3) and worn or damaged splines (1).
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