That’s a great, easy way to check, clear, practical, and straight from real experience@Trailhead The best way to tell is to get the weight off the system. Use your stabilizers and loader to lift the machine slightly, then extend the boom halfway and have someone give it a firm shake from the side
If you see the slew post lifting or shifting more than a fraction of an inch at the pins, your bushings are likely shot. if it’s just a noise with no visible movement, it might just be dry