19/11/2021 08:15:41

Gearbox Fluid - Rear Small Drive Unit (Drain and Refill)

Correction Code 40300402

Special tool(s) required for this procedure:

Part Number Description
1057312-00-A Axle Extractor
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
If the vehicle has air suspension, activate "Jack" mode on the touchscreen before raising and supporting the vehicle.

Drain

  1. Position the vehicle in preparation for raising it, but do not raise it at this time.
  2. Air suspension vehicles only: Depressurize the rear LH air spring (refer to procedure).
  3. Engage "Tow" mode.
  4. Remove the LH rear wheel (refer to procedure).
  5. Remove the mid aero shield (refer to procedure).
  6. Prepare a drain pan to catch the gearbox fluid.
  7. On the LH side of the gearbox, release the drain plug. Allow the fluid to completely drain, then reinstall the drain plug (torque 28 Nm).
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Do not attempt to fill the drive unit through the upper plug.

Refill

  1. Remove the LH parking brake caliper (refer to procedure).
  2. Release the bolts that secure the following 3 fasteners to the knuckle:
    1. Upper link
    2. Toe link
    3. Shock absorber
  3. Use the axle extractor tool to release the axle from the drive unit.
  4. Release the axle seal from the drive unit.
  5. Slowly fill the gearbox through the axle opening.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    If the gearbox is filled too quickly, fluid will spill out onto the drive unit casing.
    Informational PurposesAn informational icon, calling your attention
    Note
    Use the fluid specified in Fluids.
    Informational PurposesAn informational icon, calling your attention
    Note
    Use the amount specified in Fluid Capacities.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Use exactly the specified amount of gearbox fluid. Do not fill to the top of the axle opening.
  6. Inspect the axle seal for damage and replace if necessary.
  7. When installing the halfshaft into the drive unit:
    • Ensure that the opening of the snap ring is facing towards the bottom of the drive unit.
    • Do not damage or displace the drive unit seal.
    • Verify that the halfshaft is fully seated by carefully pushing it into the drive unit until there is an audible "click" from the snap ring.
  8. Reinstall the 3 fasteners to the knuckle.
    Warning IconA warning icon, calling your attention to a possibly risky situation
    CAUTION
    Do not fully torque the fasteners at this time; they must be torqued when the vehicle is at ride height.
    1. Upper link
    2. Toe link
    3. Shock absorber
  9. Reinstall the parking brake caliper.
  10. Reinstall the rear LH wheel.
  11. Disengage "Tow" mode.
  12. Air suspension vehicles only: Repressurize the rear LH air spring (refer to procedure).
  13. With the vehicle at ride height, fully torque the 3 fasteners to the knuckle:
    • Upper link (torque 140 Nm)
    • Toe link (torque 130 Nm)
    • Shock absorber (torque 140 Nm)
  14. Check the vehicle wheel alignment, and adjust if necessary. See Four Wheel Alignment Check (Coil Suspension) or Four Wheel Alignment Check (Air Suspension).
  15. Reinstall the mid aero shield.