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Reduction Driven Gear: Adjustment

  1. Using the ST, measure the height "A" from the AT main case mating surface to ball bearing outer ring contact surface.

    ST 499575400 GAUGE

    Fig 1: Measuring Height From AT Main Case Mating Surface To Ball Bearing Outer Ring Contact Surface Using Gauge
    G07914839Courtesy of SUBARU OF AMERICA, INC.
  2. Using the ST, measure the depth "B", which is from mating surface of extension case to ball bearing outer ring contact surface.

    ST 499575400 GAUGE

    Fig 2: Measuring Depth From Mating Surface Of Extension Case To Ball Bearing Outer Ring Contact Surface
    G07914840Courtesy of SUBARU OF AMERICA, INC.
  3. Calculation formula:

    Select the ball bearing shim from the table to adjust clearances within 0.05 - 0.25 mm (0.0020 - 0.0098 in).

    When clearances are 0.05 mm (0.0020 in):

    T (mm) = B - A + 0.23

    [T (in) = B - A + 0.0091]

    When clearances are 0.25 mm (0.0098 in):

    T (mm) = B - A + 0.03

    [T (in) = B - A + 0.0012]

    T: Shim clearance

    1. Height from the mating surface of the AT main case to the ball bearing outer ring end surface
    2. Depth from mating surface of extension case to ball bearing outer ring contact surface
    Reduction gear shim
    Part No. Thickness mm (in)
    31288AA030 0.2 (0.008)
    31288AA050 0.5 (0.020)
    31288AA060 0.3 (0.012)