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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 259 (Front Drive Axle) >> Diagnostic Information and Procedures >> Four-Wheel Drive Does Not Disengage

Four-Wheel Drive Does Not Disengage

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IMPORTANT: Before performing the following diagnostic procedure, ensure that all electrical diagnostic procedures have been performed and there are no DTCs.
Step Action Yes No
1 Confirm operation of system. Refer to Diagnostic Starting Point - Front Drive Axle .
Is the system operating properly?		 Test the system Go to Step 2 
2
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the actuator motor. Refer to Front Drive Axle Actuator Replacement .
  3. Using a brass drift, apply pressure to the clutch fork.
  4. Turn the right wheel to align the clutch gears.
While turning the right wheel, does the left wheel turn in the opposite direction?		 Test the system Go to Step 3 
3
  1. Remove the inner axle shaft and housing assembly. Refer to Front Drive Axle Inner Shaft and Inner Shaft Housing Replacement (8.25 S4WD and 9.25 Axles)  or Front Drive Axle Inner Shaft and Inner Shaft Housing Replacement (8.25 F4WD) .
  2. Inspect the following:
    • Clutch Fork
    • Clutch Sleeve
    • Clutch Gear
    • Clutch Return Spring

      Repair as needed.

Did you complete the repair?		 Test the system System OK
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