GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2004 🢒 H2 🢒 General Information 🢒 General Information 🢒 Accumulator Assembly, Spacer Plate, and Gaskets

Special Tools

    • J 25025-B Dial Indicator Post and Guide Pin Set
    • J 36850 Transjel Lubricant

Removal Procedure

    Object Number: 14464 Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement.

    3. Important: The 1-2 accumulator can be removed without removing the control valve assembly.

  3. Remove the control valve body. Refer to Valve Body and Pressure Switch Replacement.
  4. Remove the accumulator cover retaining bolts.
  5. Remove the 1-2 accumulator cover assembly.

    6. Object Number: 298151 Size: SH
  6. Disassemble the 1-2 accumulator.
    7. 6.1. Blow compressed air into the 1-2 accumulator cover, as shown, to remove the 1-2 accumulator piston.
    6.2. Remove the 1-2 accumulator inner and outer springs.
  7. Inspect the 1-2 accumulator inner and outer springs for cracks.

    8. Object Number: 298143 Size: SH
  8. Remove the 1-2 accumulator piston seal (1) from the 1-2 accumulator piston.
  9. Inspect the 1-2 accumulator piston for the following defects:
    10. • Porosity
    • Cracks
    • Scoring
    • Nicks and scratches

    Object Number: 7734 Size: SH
  10. Inspect the 1-2 accumulator cover for the following defects:
    11. • Porosity
    • Cracks
    • Scoring
    • Nicks and scratches

    Object Number: 14468 Size: SH
  11. Remove the spacer plate support retaining bolts.

    12. Important: Use care not to drop the following items that will be removed along with the spacer plate:

       • The number 1 checkball
       • The 3-4 accumulator spring
       • The 3-4 accumulator pin

  12. Remove the spacer plate support.

    13. Object Number: 14469 Size: SH
  13. Remove the spacer plate to valve body gasket, the spacer plate and the spacer plate to transmission case gasket.

    14. Object Number: 647519 Size: SH
  14. Remove the 3-4 accumulator piston (2).
  15. Inspect the 3-4 accumulator spring for cracks.

    16. Object Number: 298143 Size: SH
  16. Remove the 3-4 accumulator piston seal (1) from the 3-4 accumulator piston.
  17. Inspect the 3-4 accumulator piston for the following defects:
    18. • Porosity
    • Cracks
    • Scoring
    • Nicks and scratches

Installation Procedure

    Object Number: 298143 Size: SH
  1. Install a new 3-4 accumulator piston seal (1) to the 3-4 accumulator piston.

    2. Object Number: 686979 Size: SH
  2. Install the 3-4 accumulator pin (1) into the transmission case and retain the pin with J 36850 .

    3. Object Number: 647519 Size: SH
  3. Install the 3-4 accumulator piston (2) onto the pin (1) in the transmission case.

    4. Ensure that the 3-4 accumulator piston legs face away from the transmission case.


    Object Number: 686979 Size: SH
  4. Install the J 25025-B  (2, 3) to the transmission case.

    5. Object Number: 686994 Size: SH
  5. Install the spacer plate to transmission case gasket and the spacer plate to valve body gasket to the spacer plate; use J 36850 in order to retain the gaskets to the spacer plate.
    6. • The case gasket is identified by a CA.
    • Be sure to place the case gasket on the transmission case side of the spacer plate.
    •  The valve body gasket is identified by a VB.
    • Be sure to place the valve body gasket on the valve body side of the spacer plate.
  6. Ensure that the solenoid screens (1, 2) are in place on the spacer plate.
  7. Place the checkball (3) on the spacer plate in the location shown.
  8. Place the 3-4 accumulator spring (4) on the spacer plate.
  9. Install the spacer plate and related components to the transmission.

    10. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 14468 Size: SH
  10. Install the spacer plate support and the spacer plate support retaining bolts.

    11. Tighten
    Tighten the spacer plate support retaining bolts to 11 N·m (97 lb in).


    Object Number: 687023 Size: SH
  11. After installing the spacer plate support (2), look through the hole in the spacer plate to ensure that the checkball (1) has remained in the proper location.

    12. Object Number: 298143 Size: SH
  12. Install a new 1-2 accumulator piston seal (1) to the 1-2 accumulator piston.

    13. Object Number: 71462 Size: SH
  13. Install the 1-2 accumulator inner and outer springs to the 1-2 accumulator cover.
  14. Install the 1-2 accumulator piston onto the pin in the 1-2 accumulator cover.

    15. Ensure that the piston legs face the accumulator cover.


    Object Number: 14464 Size: SH
  15. Install the 1-2 accumulator cover and the accumulator cover retaining bolts.

    16. Tighten
    Tighten the accumulator cover retaining bolts to 11 N·m (97 lb in).

  16. Remove the J 25025-B from the transmission case.
  17. Install the control valve body. Refer to Valve Body and Pressure Switch Replacement.
  18. Install the transmission oil pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement.
  19. Lower the vehicle.
  20. Fill the transmission to the proper level with DEXRON® VI transmission fluid. Refer to Transmission Fluid Check.

    21. Important: It is recommended that transmission adaptive pressure (TAP) information be reset.

    Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.

  21. Reset the TAP values. Refer to Transmission Adaptive Functions.