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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Automatic Transaxle - 4T80-E - Introduction (2 Of 2)) >> Repair Instructions >> Repair Instructions - Off Vehicle >> Lower Control Valve Body Disassemble

Lower Control Valve Body Disassemble

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Low/Reverse Servo Components
    GM15460Courtesy of GENERAL MOTORS CORP.
  1. Remove the low/reverse servo piston retaining ring (932).
  2. Push on the low/reverse apply pin (931) to remove the low/reverse servo assembly from the control valve body.
  3. Remove the return spring (901).
  4. Remove the retaining ring (902) from the low/reverse servo assembly and push out the servo pin (931).
  5. Remove the following parts:
    • The servo cushion spring (934)
    • The sleeve (980)
    • The spring washer (933)
  6. Inspect the following items for damage:
    • The low/reverse servo piston (928)
    • The low/reverse servo seals (929, 930)
    7. Fig 2: Identifying Ball Check Capsule
    GM15462Courtesy of GENERAL MOTORS CORP.
  7. Remove the following parts:
    • The spring retainer (904)
    • The ball check capsule (905)
    • The ball (979)
  8. Inspect all parts for scratches, debris, and damage.
    9. Fig 3: Locating 3-4 Shift Valve Assembly
    GM15465Courtesy of GENERAL MOTORS CORP.
  9. Remove the following parts:
    • The retainer clip (308)
    • The bore plug (914)
    • The 3-4 shift valve (912)
    • The 3-4 shift valve spring (911)
  10. Inspect the 3-4 shift valve (912) for scratches or debris.
    11. Fig 4: 1-2 Shift Solenoid Valve
    GM1592025Courtesy of GENERAL MOTORS CORP.
  11. Remove the following parts:
    • The retainer clip (308)
    • The 1-2 shift solenoid valve (909)
    • The 1-2 shift valve B (920)
    • The 1-2 shift valve A (919),
    • The 1-2 shift valve spring (918)
  12. Inspect the 1-2 shift solenoid valve (909) for damage.
  13. Inspect the 1-2 shift valves A and B (919, 920) for scratches or debris.
    14. Fig 5: Solenoid Screen Assembly
    GM1592056Courtesy of GENERAL MOTORS CORP.
  14. Remove the solenoid screen assembly (917).
  15. Inspect the solenoid screen assembly (917) for excessive debris.
    16. Fig 6: 2-3 Shift Solenoid Valve
    GM1592062Courtesy of GENERAL MOTORS CORP.
  16. Remove the following parts:
    • The retainer clip (308)
    • The 2-3 shift solenoid valve (910)
    • The 2-3 shift valve D (908)
    • The 2-3 shift valve C (907)
    • The 2-3 shift valve spring (906)
  17. Inspect the 2-3 shift solenoid valve (910) for damage.
  18. Inspect the 2-3 shift valves C and D (907, 908) for scratches or debris.
    19. Fig 7: Manual Valve & Link
    GM1592064Courtesy of GENERAL MOTORS CORP.
  19. Remove the manual valve link (913) and the manual valve (916).
  20. Inspect the manual valve (916) for scratches or damage.
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