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Steering Gear Grunt/Shudder Test

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place a Dial Thermometer in the power steering fluid reservoir.
  2. With the engine cold, start the engine and set engine idle speed to 1, 200 rpm.
  3. NOTE: Do not hold the steering wheel against the stops for more than 5 seconds. Damage to the power steering pump may occur.

    Rotate the steering wheel to the RH stop, then turn the steering wheel 90 degrees back to the left. Slowly turn the steering wheel back and forth approximately one-twelfth of a full turn.

  4. Turn the steering wheel another 90 degrees. Slowly turn the steering wheel back and forth approximately one-twelfth of a full turn.
  5. Repeat the test with the power steering fluid at different temperatures until the temperature reaches 74-80 deg. C (165-176 deg. F).
  6. If a light grunt is heard or a low (50-200 Hz) shudder is present, this is a normal steering system condition.
  7. If a loud grunt is heard, or a strong shudder is felt, purge the power steering system. REFER to: Power Steering System Purging . If a loud grunt or strong shudder still exists, check the power steering lines/hoses for restrictions or damage and repair as necessary. If the lines/hoses are OK, install a new steering gear. REFER to: Steering Gear - Vehicles With: Hydro-Boost™ .
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