Tools & Equipment: Hand & Power Tools: Using air power tools
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Topic IntroductionHelp

Using an air impact wrench

Summary
The best use of an air impact wrench is to remove wheel lug nuts. Do not use an impact wrench to tighten wheel lug nuts. The objective of this procedure is to show you how to correctly use an air impact wrench.

Part 1. Preparation and safety

Objective

Using an air impact wrench

Personal safety

Whenever you perform a task in the workshop you must use personal protective clothing and equipment that is appropriate for the task and which conforms to your local safety regulations and policies. Among other items, this may include:

If you are not certain what is appropriate or required, ask your supervisor.

Safety check

Points to note


Part 2: Step-by-step instruction

  1. Choose the correct tool
    Use the impact wrench, sometimes called the “rattle gun”, to loosen and remove the lug nuts on the wheels. The power and the vibration will loosen a tight nut, because of the torque produced by the wrench.
  2. Adjust the direction of operation
    Adjust the direction of spin: forward or backward with the wrench lever.
  3. Adjust the amount of torque
    Turn the valve to increase or reduce the torque.
  4. Correctly remove fasteners
    Never fully tighten the wheel nuts. If you over tighten them, the bolts may fail and cause the wheel to shear off the vehicle while it is moving. Always finish the job with a lug nut wrench.
  5. Use special sockets
    Make sure only to use the special impact sockets, extensions and joints. These sockets are special 6-point types and can withstand the sudden force that the impact wrench produces.