Bearing splitters are common tools for adjusting heavy vehicle parts. You can use them to work with bearings, but they have a wide range of applications, including pulling alternator pulleys and working with steering mechanisms. They work by expanding to fit around a part that needs to be moved, then tightening to deliver a workable hold.
Once you have a grip on the part, you can use a ratchet or a wrench to move it. If the item is really stuck, you may need to tap gently around the base of the area with a rubber mallet to dislodge it.
You can pick up a basic bearing splitter on Amazon or get a comprehensive kit if you're getting into regular mechanic work.
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