2020 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

Front Differential: Installation

  1. Install the side bearing outer race.
  2. Install the differential case.
    NOTE: Be careful not to damage the inside of the case (especially the mounting surface of the differential side retainers).
    G11255993Courtesy of SUBARU OF AMERICA, INC.
  3. Temporarily install the differential side retainers using the ST.

    Preparation tool: 

    ST: WRENCH COMPL RETAINER (18658AA021)

    G08318133Courtesy of SUBARU OF AMERICA, INC.
  4. Adjust the hypoid gear set backlash. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>FRONT DIFFERENTIAL>ADJUSTMENT .
  5. Inspect and adjust the tooth contact. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>DRIVE PINION>ADJUSTMENT .
  6. Using the ST, loosen the differential side retainer until the mounting groove of the new O-ring appears, and then install the O-ring.
    NOTE:
    • When loosening the differential side retainer, record the number of the turns made.
    • Perform this for both left and right differential side retainers.
    • Apply the differential gear oil to O-ring.

    Preparation tool: 

    ST: WRENCH COMPL RETAINER (18658AA021)

  7. Using the ST, tighten the differential side retainer to the position before it is loosened.

    Preparation tool: 

    ST: WRENCH COMPL RETAINER (18658AA021)

  8. Install the oil seal to the differential side retainer. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>DIFFERENTIAL SIDE RETAINER OIL SEAL .
  9. Install the lock plate (A).

    Tightening torque: 

    25 N.m (2.5 kgf-m, 18.4 ft-lb)

    G13226005Courtesy of SUBARU OF AMERICA, INC.
  10. Install the oil baffle.
    G11255997Courtesy of SUBARU OF AMERICA, INC.
  11. Install the drive pinion. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>DRIVE PINION>INSTALLATION .
  12. Install the forward clutch. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>FORWARD CLUTCH>INSTALLATION .
  13. Install the reverse brake. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>REVERSE BRAKE>INSTALLATION .
  14. Install the primary pulley, secondary pulley and variator chain. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>PRIMARY PULLEY AND SECONDARY PULLEY>INSTALLATION .
  15. Install the reduction drive gear. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>REDUCTION DRIVE GEAR>INSTALLATION .
  16. Install the transmission case. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CASE>INSTALLATION .
  17. Install the transmission control device. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CONTROL DEVICE>INSTALLATION .
  18. Install the oil strainer and oil pan. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>OIL PAN>INSTALLATION .
  19. Install the reduction driven gear. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>REDUCTION DRIVEN GEAR>INSTALLATION .
  20. Install the parking pawl. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>PARKING PAWL>INSTALLATION .
  21. Install the transfer driven gear. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSFER DRIVEN GEAR>INSTALLATION .
  22. Install the transfer clutch. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSFER CLUTCH>INSTALLATION .
  23. Install the extension case. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>EXTENSION CASE>INSTALLATION .
  24. Install the electric oil pump. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>ELECTRIC FLUID PUMP>INSTALLATION .
  25. Install the inhibitor switch. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>INHIBITOR SWITCH>INSTALLATION .
  26. Install the secondary speed sensor. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>SECONDARY SPEED SENSOR>INSTALLATION .
  27. Install the primary speed sensor. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>PRIMARY SPEED SENSOR>INSTALLATION .
  28. Install the turbine speed sensor. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TURBINE SPEED SENSOR>INSTALLATION .
  29. Install the transmission harness. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION HARNESS>INSTALLATION .
  30. Install the control valve body. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>CONTROL VALVE BODY>INSTALLATION .
  31. Install the air breather hose. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>AIR BREATHER HOSE>INSTALLATION .
  32. Install the transmission body. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION ASSEMBLY>INSTALLATION .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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