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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Introduction (2 Of 2)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Forward Clutch Sprag Assemble

Forward Clutch Sprag Assemble

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Forward Sprag Assembly
    GM8203Courtesy of GENERAL MOTORS CORP.
  1. Inspect the forward sprag assembly (642) for the following conditions:
    • Wear or damage
    • Weak or broken springs
  2. Inspect the forward clutch outer race (644) for the following conditions:
    • Race wear or damage
    • Spline wear
    • Surface finish damage
  3. Install the forward sprag assembly (642) into the forward clutch outer race (644).
    4. Fig 2: View Of Sprag Assembly Retainer Rings
    GM8204Courtesy of GENERAL MOTORS CORP.
  4. Inspect the sprag assembly retainer rings (643) for wear or damage.
  5. Install the sprag assembly retainer rings (643) into the forward clutch sprag assembly (644).
    6. Fig 3: Inspection Areas On Forward Sprag Clutch Inner Race And Input Sun Gear Assembly
    GM213081Courtesy of GENERAL MOTORS CORP.
  6. Inspect the forward sprag clutch inner race and input sun gear assembly (640) for the following conditions:
    • Damaged spline or gear teeth
    • Ring groove damage
    • Surface finish damage
    • Loose retainer
    • Wear
    • Cracks
  7. Install the forward sprag clutch inner race and input sun gear assembly (640) into the forward sprag and outer race assembly.
    8. Fig 4: Locating Overrun Clutch
    GM213055Courtesy of GENERAL MOTORS CORP.
  8. Inspect the overrun clutch hub (639) for the following conditions:
    • Spline damage
    • Plugged lubrication holes
    • Damaged tangs
    • Cracks
  9. Install the overrun clutch hub (639) onto the sprag clutch inner race and input sun gear assembly (640).
  10. Install the overrun clutch hub retaining snap ring (638).
    11. Fig 5: Checking Sun Gear Rotation
    GM213089Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If the forward clutch sprag assembly operates backward, you have installed the sprag backward. Reassemble the sprag correctly.
  11. Test the forward clutch sprag assembly for proper operation.
    1. Position the forward clutch sprag assembly with the input sun gear facing up.
      2. IMPORTANT: The sun gear should only rotate in a counterclockwise direction.
    2. Hold the forward sprag clutch outer race (644) with one hand and rotate the input sun gear (640) with the other hand.
  12. Install the forward clutch sprag and input sun gear assembly into the input clutch housing.
  13. Index the overrun clutch hub into the overrun clutch plates.
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